diff --git a/.circleci/config.yml b/.circleci/config.yml
index b07c9638..cad32112 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -7,7 +7,7 @@ references:
 
   container_config: &container_config
     docker:
-      - image: circleci/android:api-28
+      - image: circleci/android@sha256:5cdc8626cc6f13efe5ed982cdcdb432b0472f8740fed8743a6461e025ad6cdfc
     working_directory: *workspace_root
     environment:
       environment:
@@ -35,7 +35,7 @@ jobs:
           command: ./gradlew dependencies --no-daemon --stacktrace --console=plain -PdisablePreDex || true
       - run:
           name: Initial build
-          command: ./gradlew build -x test -x lint -x fabricGenerateResourcesRelease -x packageRelease --no-daemon --stacktrace --console=plain -PdisablePreDex
+          command: ./gradlew build -x test -x lint -x fabricGenerateResourcesFdroidRelease -x fabricGenerateResourcesPlayRelease -x packageRelease --no-daemon --stacktrace --console=plain -PdisablePreDex
       - run:
           name: Run FOSSA
           command: fossa --no-ansi || true
@@ -56,7 +56,7 @@ jobs:
           <<: *general_cache_key
       - run:
           name: Run lint
-          command: ./gradlew lint -x fabricGenerateResourcesRelease --no-daemon --stacktrace --console=plain -PdisablePreDex
+          command: ./gradlew lint -x fabricGenerateResourcesFdroidRelease -x fabricGenerateResourcesPlayRelease --no-daemon --stacktrace --console=plain -PdisablePreDex
       - store_artifacts:
           path: ./app/build/reports/
           destination: lint_reports/app/
@@ -75,7 +75,7 @@ jobs:
           <<: *general_cache_key
       - run:
           name: Run app tests
-          command: ./gradlew :app:test :app:jacocoTestReport -x fabricGenerateResourcesRelease --no-daemon --stacktrace --console=plain -PdisablePreDex
+          command: ./gradlew :app:test :app:jacocoTestReport -x fabricGenerateResourcesFdroidRelease -x fabricGenerateResourcesPlayRelease --no-daemon --stacktrace --console=plain -PdisablePreDex
       - run:
           name: Upload unit code coverage to codecov
           command: bash <(curl -s https://codecov.io/bash) -F app
@@ -93,6 +93,9 @@ jobs:
     <<: *container_config
     steps:
       - *attach_workspace
+      - run:
+          name: Accept licenses
+          command: yes | sdkmanager --licenses && yes | sdkmanager --update
       - run:
           name: Setup emulator
           command: sdkmanager "system-images;android-19;default;armeabi-v7a" && echo "no" | avdmanager create avd -n test -k "system-images;android-19;default;armeabi-v7a"
@@ -113,7 +116,7 @@ jobs:
             adb shell input keyevent 82
       - run:
           name: Run instrumented tests
-          command: ./gradlew clean createDebugCoverageReport jacocoTestReport --no-daemon --stacktrace --console=plain -PdisablePreDex
+          command: ./gradlew clean createPlayDebugCoverageReport jacocoTestReport --no-daemon --stacktrace --console=plain -PdisablePreDex
       - run:
           name: Collect logs from emulator
           command: adb logcat -d > ./app/build/reports/logcat_emulator.txt
@@ -159,7 +162,7 @@ jobs:
             openssl aes-256-cbc -d -in ./app/upload-key-encrypted.jks -k $ENCRYPT_KEY >> ./app/upload-key.jks
       - run:
           name: Publish release
-          command: ./gradlew publish --no-daemon --stacktrace --console=plain -PenableCrashlytics -PdisablePreDex
+          command: ./gradlew publishPlayRelease --no-daemon --stacktrace --console=plain -PenableCrashlytics -PdisablePreDex
 
 workflows:
   version: 2
diff --git a/.gitignore b/.gitignore
index 6bc531b6..6cb549fa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,39 +1,90 @@
-/captures
-.externalNativeBuild
-
-## https://gist.github.com/iainconnor/8605514
+# Created by https://www.gitignore.io
 
 # Built application files
-/build
-/*/build/
+*.apk
+*.ap_
+*.aab
 
-# Crashlytics configuations
-com_crashlytics_export_strings.xml
+# Files for the ART/Dalvik VM
+*.dex
+
+# Java class files
+*.class
+
+# Generated files
+bin/
+gen/
+out/
+
+# Gradle files
+.gradle/
+build/
 
 # Local configuration file (sdk path, etc)
 local.properties
 
-# Gradle generated files
-.gradle/
+# Proguard folder generated by Eclipse
+proguard/
 
-# Signing files
-.signing/
+# Log Files
+*.log
 
-# User-specific configurations
-.idea/copyright/profiles_settings.xml
+# Android Studio Navigation editor temp files
+.navigation/
+
+# Android Studio captures folder
+captures/
+
+# IntelliJ configurations
+*.iml
+.idea/workspace.xml
+.idea/tasks.xml
+.idea/gradle.xml
+.idea/assetWizardSettings.xml
+.idea/dictionaries
+.idea/libraries
+.idea/caches
+.idea/modules.xml
+.idea/navEditor.xml
+.idea/caches/
 .idea/libraries/
-.idea/inspectionProfiles/
+.idea/shelf/
 .idea/.name
 .idea/compiler.xml
+.idea/copyright/profiles_settings.xml
 .idea/encodings.xml
 .idea/misc.xml
-.idea/modules.xml
 .idea/scopes/scope_settings.xml
-.idea/tasks.xml
 .idea/vcs.xml
-.idea/workspace.xml
-.idea/caches/
-*.iml
+.idea/jsLibraryMappings.xml
+.idea/datasources.xml
+.idea/dataSources.ids
+.idea/sqlDataSources.xml
+.idea/dynamic.xml
+.idea/uiDesigner.xml
+.idea/runConfigurations.xml
+
+# Keystore files
+*.jks
+*.keystore
+*.p12
+
+# External native build folder generated in Android Studio 2.2 and later
+.externalNativeBuild
+
+# Version control
+vcs.xml
+
+# lint
+lint/intermediates/
+lint/generated/
+lint/outputs/
+lint/tmp/
+lint/reports/
+
+### Android Patch ###
+gen-external-apklibs
+output.json
 
 # OS-specific files
 .DS_Store
@@ -43,8 +94,20 @@ local.properties
 .Trashes
 ehthumbs.db
 Thumbs.db
-.idea/caches/
-app/key.p12
-app/upload-key.jks
-*.log
-.idea/assetWizardSettings.xml
+
+# Legacy Eclipse project files
+.classpath
+.project
+.cproject
+.settings/
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.war
+*.ear
+
+### AndroidStudio Patch ###
+
+!/gradle/wrapper/gradle-wrapper.jar
\ No newline at end of file
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 0d1bcd5d..a84ac839 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -12,7 +12,7 @@ build:
   script:
     - ./gradlew --no-daemon --stacktrace dependencies || true
     - ./gradlew --no-daemon --stacktrace assembleDebug
-    - mv app/build/outputs/apk/debug/app-debug.apk .
+    - mv app/build/outputs/apk/fdroid/debug/app-fdroid-debug.apk .
   artifacts:
     name: "${CI_PROJECT_NAME}_${CI_BUILD_REF_NAME}-${CI_BUILD_ID}"
     paths:
@@ -26,7 +26,7 @@ tests:
      - .gradle
     policy: pull
   script:
-    - ./gradlew --no-daemon --stacktrace -x fabricGenerateResourcesRelease test
+    - ./gradlew --no-daemon --stacktrace -x fabricGenerateResourcesFdroidRelease -x fabricGenerateResourcesPlayRelease test
   artifacts:
     paths:
     - app/build/reports/tests
@@ -39,7 +39,7 @@ lint:
      - .gradle
     policy: pull
   script:
-    - ./gradlew --no-daemon --stacktrace -x fabricGenerateResourcesRelease lint
+    - ./gradlew --no-daemon --stacktrace -x fabricGenerateResourcesFdroidRelease -x fabricGenerateResourcesPlayRelease lint
   artifacts:
     paths:
     - app/build/reports
diff --git a/.idea/codeStyles/Project.xml b/.idea/codeStyles/Project.xml
index 43e9b544..dcdde40f 100644
--- a/.idea/codeStyles/Project.xml
+++ b/.idea/codeStyles/Project.xml
@@ -21,6 +21,9 @@
       <option name="CONTINUATION_INDENT_IN_ELVIS" value="false" />
       <option name="WRAP_ELVIS_EXPRESSIONS" value="0" />
     </JetCodeStyleSettings>
+    <MarkdownNavigatorCodeStyleSettings>
+      <option name="RIGHT_MARGIN" value="72" />
+    </MarkdownNavigatorCodeStyleSettings>
     <XML>
       <option name="XML_KEEP_LINE_BREAKS" value="false" />
       <option name="XML_ALIGN_ATTRIBUTES" value="false" />
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
deleted file mode 100644
index 7ac24c77..00000000
--- a/.idea/gradle.xml
+++ /dev/null
@@ -1,18 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="GradleSettings">
-    <option name="linkedExternalProjectsSettings">
-      <GradleProjectSettings>
-        <option name="distributionType" value="DEFAULT_WRAPPED" />
-        <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="modules">
-          <set>
-            <option value="$PROJECT_DIR$" />
-            <option value="$PROJECT_DIR$/app" />
-          </set>
-        </option>
-        <option name="resolveModulePerSourceSet" value="false" />
-      </GradleProjectSettings>
-    </option>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/runConfigurations.xml b/.idea/runConfigurations.xml
deleted file mode 100644
index 7f68460d..00000000
--- a/.idea/runConfigurations.xml
+++ /dev/null
@@ -1,12 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="RunConfigurationProducerService">
-    <option name="ignoredProducers">
-      <set>
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.AllInPackageGradleConfigurationProducer" />
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestClassGradleConfigurationProducer" />
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestMethodGradleConfigurationProducer" />
-      </set>
-    </option>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index 10824e32..3b19799a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,10 +11,10 @@ cache:
     - $HOME/.gradle/caches/
     - $HOME/.gradle/wrapper/
 
-#branches:
-#  only:
-#    - master
-#    - 0.8.x
+branches:
+  only:
+    - develop
+    - 0.9.4
 
 android:
  licenses:
@@ -48,20 +48,20 @@ before_script:
 script:
   - ./gradlew dependencies --stacktrace --daemon
   - fossa --no-ansi || true
-  - ./gradlew lint -x fabricGenerateResourcesRelease --stacktrace --daemon
-  - ./gradlew test -x fabricGenerateResourcesRelease --stacktrace --daemon
-  - ./gradlew createDebugCoverageReport --stacktrace --daemon
+  #- ./gradlew lintPlayRelease -x fabricGenerateResourcesPlayRelease --stacktrace --daemon
+  - ./gradlew testPlayDebugUnitTest -x fabricGenerateResourcesPlay --stacktrace --daemon
+  - ./gradlew createPlayDebugCoverageReport --stacktrace --daemon
   - ./gradlew jacocoTestReport --stacktrace --daemon
   - if [ -z ${SONAR_HOST+x} ]; then echo "sonar scan skipped"; else
       git fetch --unshallow;
-      ./gradlew sonarqube -x test -x lint -x fabricGenerateResourcesRelease -Dsonar.host.url=$SONAR_HOST -Dsonar.organization=$SONAR_ORG -Dsonar.login=$SONAR_KEY -Dsonar.branch.name=${TRAVIS_PULL_REQUEST_BRANCH:-$TRAVIS_BRANCH} --stacktrace --daemon;
+      ./gradlew sonarqube -x test -x lint -x fabricGenerateResourcesPlayRelease -x fabricGenerateResourcesFdroidRelease -Dsonar.host.url=$SONAR_HOST -Dsonar.organization=$SONAR_ORG -Dsonar.login=$SONAR_KEY -Dsonar.branch.name=${TRAVIS_PULL_REQUEST_BRANCH:-$TRAVIS_BRANCH} --stacktrace --daemon;
     fi
   - |
     if [ $TRAVIS_TAG ]; then
       gpg --yes --batch --passphrase=$SERVICES_ENCRYPT_KEY ./app/src/release/google-services.json.gpg;
       gpg --yes --batch --passphrase=$ENCRYPT_KEY ./app/key.p12.gpg;
       gpg --yes --batch --passphrase=$ENCRYPT_KEY ./app/upload-key.jks.gpg;
-      ./gradlew publish -PenableCrashlytics --stacktrace;
+      ./gradlew publishPlayRelease -PenableCrashlytics --stacktrace;
     fi
 
 after_success:
diff --git a/LICENSE b/LICENSE
index f48b2114..5dd9cacf 100644
--- a/LICENSE
+++ b/LICENSE
@@ -186,7 +186,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright 2017 wulkanowy
+   Copyright 2019 Wulkanowy
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
diff --git a/README.en.md b/README.en.md
new file mode 100644
index 00000000..9e158515
--- /dev/null
+++ b/README.en.md
@@ -0,0 +1,61 @@
+[Polska wersja README](README.md)
+
+# Wulkanowy
+[![Travis](https://img.shields.io/travis/com/wulkanowy/wulkanowy/master.svg?style=flat-square)](https://travis-ci.com/wulkanowy/wulkanowy)
+[![Codecov](https://img.shields.io/codecov/c/github/wulkanowy/wulkanowy/master.svg?style=flat-square)](https://codecov.io/gh/wulkanowy/wulkanowy)
+[![Discord](https://img.shields.io/discord/390889354199040011.svg?style=flat-square)](https://discord.gg/vccAQBr)
+[![F-Droid](https://img.shields.io/f-droid/v/io.github.wulkanowy.svg)](https://f-droid.org/packages/io.github.wulkanowy/)
+[![Last release](https://img.shields.io/github/release/wulkanowy/wulkanowy.svg?logo=github)](https://github.com/wulkanowy/wulkanowy/releases)
+
+Unofficial android VULCAN UONET+ register client for student and parent
+
+## Features
+
+* logging in using the email and password
+* functions from the register website:
+    * grades
+    * grade statistics
+    * attendance
+    * percentage of attendance
+    * exams
+    * timetable
+    * completed lessons
+    * messages
+    * homework
+    * notes
+    * lucky number
+* calculation of the average
+* notifications, e.g. about a new grade
+* dark and black (AMOLED) theme
+* offline mode
+* no ads
+
+## Download
+
+You can download the current beta from the Google Play or Fdroid store
+
+[<img src="https://play.google.com/intl/en_us/badges/images/generic/en_badge_web_generic.png"
+      alt="Get it on Google Play"
+      height="80">](https://play.google.com/store/apps/details?id=io.github.wulkanowy)
+[<img src="https://fdroid.gitlab.io/artwork/badge/get-it-on.png"
+    alt="Get it on Fdroid"
+    height="80">](https://f-droid.org/packages/io.github.wulkanowy/)
+    
+You can also download a [development version](https://wulkanowy.github.io/#download) that includes new features prepared for the next release
+
+## Built With
+
+
+* [Wulkanowy API](https://github.com/wulkanowy/api)
+* [RxJava 2](https://github.com/ReactiveX/RxJava)
+* [Dagger 2](https://github.com/google/dagger)
+* [Room](https://developer.android.com/topic/libraries/architecture/room)
+* [WorkManager](https://developer.android.com/topic/libraries/architecture/workmanager) 
+
+## Contributing
+
+Please contribute to the project either by creating a PR or submitting an issue on GitHub.
+
+## License
+
+This project is licensed under the Apache License 2.0 - see the [LICENSE](LICENSE) file for details
diff --git a/README.md b/README.md
index 97a4172c..559c8f44 100644
--- a/README.md
+++ b/README.md
@@ -1,22 +1,62 @@
+[English version of README](README.en.md)
+
 # Wulkanowy
-
-[![CircleCI](https://img.shields.io/circleci/project/github/wulkanowy/wulkanowy/master.svg?style=flat-square)](https://circleci.com/gh/wulkanowy/wulkanowy)
 [![Travis](https://img.shields.io/travis/com/wulkanowy/wulkanowy/master.svg?style=flat-square)](https://travis-ci.com/wulkanowy/wulkanowy)
-[![Bitrise](https://img.shields.io/bitrise/daeff1893f3c8128/master.svg?token=Hjm1ACamk86JDeVVJHOeqQ&style=flat-square)](https://www.bitrise.io/app/daeff1893f3c8128)
 [![Codecov](https://img.shields.io/codecov/c/github/wulkanowy/wulkanowy/master.svg?style=flat-square)](https://codecov.io/gh/wulkanowy/wulkanowy)
-[![BCH compliance](https://bettercodehub.com/edge/badge/wulkanowy/wulkanowy?branch=master)](https://bettercodehub.com/)
-[![Sonarcloud](https://sonarcloud.io/api/project_badges/measure?project=io.github.wulkanowy%3Aapp&metric=sqale_rating)](https://sonarcloud.io/dashboard?id=io.github.wulkanowy%3Aapp)
-[![FOSSA Status](https://app.fossa.com/api/projects/custom%2B5644%2Fgithub.com%2Fwulkanowy%2Fwulkanowy.svg?type=shield)](https://app.fossa.com/projects/custom%2B5644%2Fgithub.com%2Fwulkanowy%2Fwulkanowy?ref=badge_shield)
 [![Discord](https://img.shields.io/discord/390889354199040011.svg?style=flat-square)](https://discord.gg/vccAQBr)
+[![F-Droid](https://img.shields.io/f-droid/v/io.github.wulkanowy.svg)](https://f-droid.org/packages/io.github.wulkanowy/)
+[![Last release](https://img.shields.io/github/release/wulkanowy/wulkanowy.svg?logo=github)](https://github.com/wulkanowy/wulkanowy/releases)
 
-[Pobierz wersję beta z Google Play](https://play.google.com/store/apps/details?id=io.github.wulkanowy&amp;utm_source=vcs)
+Nieoficjalny klient dziennika VULCAN UONET+ dla ucznia i rodzica
 
-[Pobierz wersję DEV](https://bitrise-redirector.herokuapp.com/v0.1/apps/f841f20d8f8b1dc8/builds/master/artifacts/0)
-[(Więcej wersji DEV)](https://wulkanowy.github.io/dev.html)
+## Funkcje
 
-Androidowy klient dziennika VULCAN UONET+.
+* logowanie za pomocą e-maila i hasła
+* funkcje ze strony internetowej dziennika:
+    * oceny
+    * statystyki ocen
+    * frekwencja
+    * procent frekwencji
+    * sprawdziany
+    * plan lekcji
+    * lekcje zrealizowane
+    * wiadomości
+    * zadania domowe
+    * uwagi
+    * szczęśliwy numerek
+* obliczanie średniej
+* powiadomienia np. o nowej ocenie
+* ciemny i czarny (AMOLED) motyw
+* tryb offilne
+* brak reklam
+
+## Pobierz
+
+Aktualną wersję beta możesz pobrać ze sklepu Google Play lub Fdroid
+
+[<img src="https://play.google.com/intl/en_us/badges/images/generic/en_badge_web_generic.png"
+      alt="Pobierz z Google Play"
+      height="80">](https://play.google.com/store/apps/details?id=io.github.wulkanowy)
+[<img src="https://fdroid.gitlab.io/artwork/badge/get-it-on.png"
+    alt="Pobierz z Fdroid"
+    height="80">](https://f-droid.org/packages/io.github.wulkanowy/)
 
 
-## License
+Możesz także pobrać [wersję rozwojową](https://wulkanowy.github.io/#download), która zawiera nowe funkcje przygotowywane do następnego wydania
 
-[![FOSSA Status](https://app.fossa.com/api/projects/custom%2B5644%2Fgithub.com%2Fwulkanowy%2Fwulkanowy.svg?type=large)](https://app.fossa.com/projects/custom%2B5644%2Fgithub.com%2Fwulkanowy%2Fwulkanowy?ref=badge_large)
+
+## Zbudowana za pomocą
+
+* [Wulkanowy API](https://github.com/wulkanowy/api)
+* [RxJava 2](https://github.com/ReactiveX/RxJava)
+* [Dagger 2](https://github.com/google/dagger)
+* [Room](https://developer.android.com/topic/libraries/architecture/room)
+* [WorkManager](https://developer.android.com/topic/libraries/architecture/workmanager) 
+
+## Współpraca
+
+Wnieś swój wkład w projekt, tworząc PR lub wysyłając issue na GitHub.
+
+## Licencja
+
+Ten projekt jest licencjonowany w ramach Apache License 2.0 - szczegóły w pliku [LICENSE](LICENSE)
\ No newline at end of file
diff --git a/app/.gitignore b/app/.gitignore
deleted file mode 100644
index 796b96d1..00000000
--- a/app/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-/build
diff --git a/app/build.gradle b/app/build.gradle
index 5a3a7f2a..499f0636 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -6,6 +6,7 @@ apply plugin: 'io.fabric'
 apply plugin: 'com.github.triplet.play'
 apply from: 'jacoco.gradle'
 apply from: 'sonarqube.gradle'
+apply from: 'hooks.gradle'
 
 android {
     compileSdkVersion 28
@@ -14,10 +15,10 @@ android {
     defaultConfig {
         applicationId "io.github.wulkanowy"
         testApplicationId "io.github.tests.wulkanowy"
-        minSdkVersion 15
+        minSdkVersion 16
         targetSdkVersion 28
-        versionCode 35
-        versionName "0.8.2"
+        versionCode 42
+        versionName "0.9.4"
         multiDexEnabled true
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
@@ -63,6 +64,18 @@ android {
         }
     }
 
+    flavorDimensions "platform"
+    productFlavors {
+        play {
+            dimension "platform"
+        }
+
+        fdroid {
+            buildConfigField "boolean", "CRASHLYTICS_ENABLED", "false"
+            dimension "platform"
+        }
+    }
+
     lintOptions {
         disable 'HardwareIds'
     }
@@ -84,71 +97,91 @@ play {
     track = 'alpha'
 }
 
+ext {
+    work_manager = "2.1.0"
+    room = "2.1.0"
+    dagger = "2.24"
+    chucker = "2.0.4"
+    mockk = "1.9.2"
+    mockito_core = "3.0.4"
+}
+
 dependencies {
-    implementation 'io.github.wulkanowy:api:0.8.2'
+    implementation "io.github.wulkanowy:api:0.9.4"
 
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
-    implementation "androidx.legacy:legacy-support-v4:1.0.0"
+    implementation "androidx.core:core:1.0.2"
     implementation "androidx.appcompat:appcompat:1.0.2"
-    implementation 'androidx.multidex:multidex:2.0.1'
+    implementation "androidx.fragment:fragment:1.0.0"
+    implementation "androidx.annotation:annotation:1.1.0"
+    implementation "androidx.multidex:multidex:2.0.1"
 
-    implementation "androidx.cardview:cardview:1.0.0"
-    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
-    implementation "com.google.android.material:material:1.1.0-alpha05"
-    implementation 'com.github.wulkanowy:MaterialChipsInput:b72fd0ee6f'
-    implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0'
+    implementation "androidx.recyclerview:recyclerview:1.0.0"
+    implementation "androidx.viewpager:viewpager:1.0.0"
+    implementation "androidx.swiperefreshlayout:swiperefreshlayout:1.0.0"
+    implementation "androidx.constraintlayout:constraintlayout:1.1.3"
+    implementation "androidx.coordinatorlayout:coordinatorlayout:1.0.0"
+    implementation "com.google.android.material:material:1.1.0-alpha07"
+    implementation "com.github.wulkanowy:MaterialChipsInput:b72fd0ee6f"
+    implementation "com.github.PhilJay:MPAndroidChart:v3.1.0"
 
-    implementation "androidx.work:work-runtime:2.0.1"
-    implementation "androidx.work:work-rxjava2:2.0.1"
+    implementation "androidx.work:work-runtime:$work_manager"
+    implementation "androidx.work:work-rxjava2:$work_manager"
 
-    implementation "androidx.room:room-runtime:2.1.0-alpha07"
-    implementation "androidx.room:room-rxjava2:2.1.0-alpha07"
-    kapt "androidx.room:room-compiler:2.1.0-alpha07"
+    implementation "androidx.room:room-runtime:$room"
+    implementation "androidx.room:room-rxjava2:$room"
+    kapt "androidx.room:room-compiler:$room"
 
-    implementation "com.google.dagger:dagger-android-support:2.22.1"
-    kapt "com.google.dagger:dagger-compiler:2.22.1"
-    kapt "com.google.dagger:dagger-android-processor:2.22.1"
-    implementation 'com.squareup.inject:assisted-inject-annotations-dagger2:0.4.0'
-    kapt 'com.squareup.inject:assisted-inject-processor-dagger2:0.4.0'
+    implementation "com.google.dagger:dagger-android-support:$dagger"
+    kapt "com.google.dagger:dagger-compiler:$dagger"
+    kapt "com.google.dagger:dagger-android-processor:$dagger"
+    implementation "com.squareup.inject:assisted-inject-annotations-dagger2:0.5.0"
+    kapt "com.squareup.inject:assisted-inject-processor-dagger2:0.5.0"
 
     implementation "eu.davidea:flexible-adapter:5.1.0"
     implementation "eu.davidea:flexible-adapter-ui:1.0.0"
     implementation "com.aurelhubert:ahbottomnavigation:2.3.4"
-    implementation 'com.ncapdevi:frag-nav:3.2.0'
+    implementation "com.ncapdevi:frag-nav:3.3.0"
 
-    implementation 'com.github.pwittchen:reactivenetwork-rx2:3.0.2'
-    implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
-    implementation "io.reactivex.rxjava2:rxjava:2.2.8"
+    implementation "com.github.pwittchen:reactivenetwork-rx2:3.0.4"
+    implementation "io.reactivex.rxjava2:rxandroid:2.1.1"
+    implementation "io.reactivex.rxjava2:rxjava:2.2.11"
 
-    implementation 'com.google.code.gson:gson:2.8.5'
-    implementation "com.jakewharton.threetenabp:threetenabp:1.2.0"
+    implementation "com.google.code.gson:gson:2.8.5"
+    implementation "com.jakewharton.threetenabp:threetenabp:1.2.1"
     implementation "com.jakewharton.timber:timber:4.7.1"
     implementation "at.favre.lib:slf4j-timber:1.0.1"
-    implementation "com.squareup.okhttp3:logging-interceptor:3.12.1"
+    implementation "com.squareup.okhttp3:logging-interceptor:3.12.3"
 
     implementation "com.mikepenz:aboutlibraries:6.2.3"
-    implementation 'com.takisoft.preferencex:preferencex:1.0.0'
+    implementation "com.takisoft.preferencex:preferencex:1.0.0"
 
-    implementation 'com.google.firebase:firebase-core:16.0.8'
-    implementation 'com.crashlytics.sdk.android:crashlytics:2.9.9'
+    playImplementation "com.google.firebase:firebase-core:17.0.1"
+    playImplementation "com.crashlytics.sdk.android:crashlytics:2.10.1"
 
-    releaseImplementation 'fr.o80.chucker:library-no-op:2.0.4'
+    releaseImplementation "fr.o80.chucker:library-no-op:$chucker"
 
-    debugImplementation 'fr.o80.chucker:library:2.0.4'
+    debugImplementation "fr.o80.chucker:library:$chucker"
     debugImplementation "com.amitshekhar.android:debug-db:1.0.6"
 
     testImplementation "junit:junit:4.12"
-    testImplementation "io.mockk:mockk:1.9.2"
-    testImplementation "org.mockito:mockito-inline:2.27.0"
-    testImplementation 'org.threeten:threetenbp:1.3.8'
+    testImplementation "io.mockk:mockk:$mockk"
+    testImplementation "org.threeten:threetenbp:1.4.0"
+    testImplementation "org.mockito:mockito-core:$mockito_core"
+    testImplementation("org.mockito:mockito-inline:3.0.4") {
+        exclude group: "org.mockito", module: "mockito-core"
+    }
 
-    androidTestImplementation 'androidx.test:core:1.1.0'
-    androidTestImplementation 'androidx.test:runner:1.1.1'
-    androidTestImplementation 'androidx.test.ext:junit:1.1.0'
-    androidTestImplementation "io.mockk:mockk-android:1.9.2"
-    androidTestImplementation 'org.mockito:mockito-android:2.27.0'
-    androidTestImplementation "androidx.room:room-testing:2.1.0-alpha07"
+    androidTestImplementation "androidx.test:core:1.2.0"
+    androidTestImplementation "androidx.test:runner:1.2.0"
+    androidTestImplementation "androidx.test.ext:junit:1.1.1"
+    androidTestImplementation "io.mockk:mockk-android:$mockk"
+    androidTestImplementation "androidx.room:room-testing:$room"
     androidTestImplementation "org.jetbrains.kotlin:kotlin-test:$kotlin_version"
+    androidTestImplementation "org.mockito:mockito-core:$mockito_core"
+    androidTestImplementation("org.mockito:mockito-android:3.0.4") {
+        exclude group: 'org.mockito', module: 'mockito-core'
+    }
 }
 
 apply plugin: 'com.google.gms.google-services'
diff --git a/app/hooks.gradle b/app/hooks.gradle
new file mode 100644
index 00000000..038fa9fb
--- /dev/null
+++ b/app/hooks.gradle
@@ -0,0 +1,10 @@
+apply plugin: "com.star-zero.gradle.githook"
+
+githook {
+    failOnMissingHooksDir = false
+    hooks {
+        "pre-push" {
+            shell = "./app/play-publish-lint.sh"
+        }
+    }
+}
diff --git a/app/jacoco.gradle b/app/jacoco.gradle
index f22c3359..44cd3f62 100644
--- a/app/jacoco.gradle
+++ b/app/jacoco.gradle
@@ -35,11 +35,14 @@ task jacocoTestReport(type: JacocoReport) {
             dir: "$buildDir/intermediates/classes/debug",
             excludes: excludes
     ) + fileTree(
-            dir: "$buildDir/tmp/kotlin-classes/debug",
+            dir: "$buildDir/tmp/kotlin-classes/playDebug",
             excludes: excludes
     ))
 
-    sourceDirectories.setFrom(files("$project.projectDir/src/main/java"))
+    sourceDirectories.setFrom(files([
+            "src/main/java",
+            "src/play/java"
+    ]))
     executionData.setFrom(fileTree(
             dir: project.projectDir,
             includes: ["**/*.exec", "**/*.ec"]
diff --git a/app/key-encrypted.p12 b/app/key-encrypted.p12
deleted file mode 100644
index d9811213..00000000
Binary files a/app/key-encrypted.p12 and /dev/null differ
diff --git a/app/play-publish-lint.sh b/app/play-publish-lint.sh
new file mode 100755
index 00000000..d3354b1a
--- /dev/null
+++ b/app/play-publish-lint.sh
@@ -0,0 +1,7 @@
+#!/bin/bash -
+
+content=$(cat < "app/src/main/play/release-notes/pl-PL/default.txt") || exit
+if [[ "${#content}" -gt 500 ]]; then
+    echo >&2 "Release notes content has reached the limit of 500 characters"
+    exit 1
+fi
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 15b62838..7d42536d 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -37,3 +37,6 @@
 
 #Config for API
 -keep class io.github.wulkanowy.api.** {*;}
+
+#Config for Material Components
+-keep class com.google.android.material.tabs.** {*;}
diff --git a/app/schemas/io.github.wulkanowy.data.db.AppDatabase/14.json b/app/schemas/io.github.wulkanowy.data.db.AppDatabase/14.json
new file mode 100644
index 00000000..82b76492
--- /dev/null
+++ b/app/schemas/io.github.wulkanowy.data.db.AppDatabase/14.json
@@ -0,0 +1,1386 @@
+{
+  "formatVersion": 1,
+  "database": {
+    "version": 14,
+    "identityHash": "b22945c41e7841ff2e6b16af346dde0c",
+    "entities": [
+      {
+        "tableName": "Students",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `endpoint` TEXT NOT NULL, `loginType` TEXT NOT NULL, `email` TEXT NOT NULL, `password` TEXT NOT NULL, `symbol` TEXT NOT NULL, `student_id` INTEGER NOT NULL, `student_name` TEXT NOT NULL, `school_id` TEXT NOT NULL, `school_name` TEXT NOT NULL, `class_name` TEXT NOT NULL, `class_id` INTEGER NOT NULL, `is_current` INTEGER NOT NULL, `registration_date` INTEGER NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "endpoint",
+            "columnName": "endpoint",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "loginType",
+            "columnName": "loginType",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "email",
+            "columnName": "email",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "password",
+            "columnName": "password",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "symbol",
+            "columnName": "symbol",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentName",
+            "columnName": "student_name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "schoolSymbol",
+            "columnName": "school_id",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "schoolName",
+            "columnName": "school_name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "className",
+            "columnName": "class_name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "classId",
+            "columnName": "class_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "isCurrent",
+            "columnName": "is_current",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "registrationDate",
+            "columnName": "registration_date",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [
+          {
+            "name": "index_Students_email_symbol_student_id_school_id_class_id",
+            "unique": true,
+            "columnNames": [
+              "email",
+              "symbol",
+              "student_id",
+              "school_id",
+              "class_id"
+            ],
+            "createSql": "CREATE UNIQUE INDEX `index_Students_email_symbol_student_id_school_id_class_id` ON `${TABLE_NAME}` (`email`, `symbol`, `student_id`, `school_id`, `class_id`)"
+          }
+        ],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Semesters",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `diary_id` INTEGER NOT NULL, `diary_name` TEXT NOT NULL, `school_year` INTEGER NOT NULL, `semester_id` INTEGER NOT NULL, `semester_name` INTEGER NOT NULL, `is_current` INTEGER NOT NULL, `start` INTEGER NOT NULL, `end` INTEGER NOT NULL, `class_id` INTEGER NOT NULL, `unit_id` INTEGER NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "diaryId",
+            "columnName": "diary_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "diaryName",
+            "columnName": "diary_name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "schoolYear",
+            "columnName": "school_year",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "semesterId",
+            "columnName": "semester_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "semesterName",
+            "columnName": "semester_name",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "isCurrent",
+            "columnName": "is_current",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "start",
+            "columnName": "start",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "end",
+            "columnName": "end",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "classId",
+            "columnName": "class_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "unitId",
+            "columnName": "unit_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [
+          {
+            "name": "index_Semesters_student_id_diary_id_semester_id",
+            "unique": true,
+            "columnNames": [
+              "student_id",
+              "diary_id",
+              "semester_id"
+            ],
+            "createSql": "CREATE UNIQUE INDEX `index_Semesters_student_id_diary_id_semester_id` ON `${TABLE_NAME}` (`student_id`, `diary_id`, `semester_id`)"
+          }
+        ],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Exams",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `diary_id` INTEGER NOT NULL, `date` INTEGER NOT NULL, `entry_date` INTEGER NOT NULL, `subject` TEXT NOT NULL, `group` TEXT NOT NULL, `type` TEXT NOT NULL, `description` TEXT NOT NULL, `teacher` TEXT NOT NULL, `teacher_symbol` TEXT NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "diaryId",
+            "columnName": "diary_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "entryDate",
+            "columnName": "entry_date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "group",
+            "columnName": "group",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "type",
+            "columnName": "type",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "description",
+            "columnName": "description",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacher",
+            "columnName": "teacher",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacherSymbol",
+            "columnName": "teacher_symbol",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Timetable",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `diary_id` INTEGER NOT NULL, `number` INTEGER NOT NULL, `start` INTEGER NOT NULL, `end` INTEGER NOT NULL, `date` INTEGER NOT NULL, `subject` TEXT NOT NULL, `subjectOld` TEXT NOT NULL, `group` TEXT NOT NULL, `room` TEXT NOT NULL, `roomOld` TEXT NOT NULL, `teacher` TEXT NOT NULL, `teacherOld` TEXT NOT NULL, `info` TEXT NOT NULL, `changes` INTEGER NOT NULL, `canceled` INTEGER NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "diaryId",
+            "columnName": "diary_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "number",
+            "columnName": "number",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "start",
+            "columnName": "start",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "end",
+            "columnName": "end",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subjectOld",
+            "columnName": "subjectOld",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "group",
+            "columnName": "group",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "room",
+            "columnName": "room",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "roomOld",
+            "columnName": "roomOld",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacher",
+            "columnName": "teacher",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacherOld",
+            "columnName": "teacherOld",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "info",
+            "columnName": "info",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "changes",
+            "columnName": "changes",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "canceled",
+            "columnName": "canceled",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Attendance",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `diary_id` INTEGER NOT NULL, `date` INTEGER NOT NULL, `number` INTEGER NOT NULL, `subject` TEXT NOT NULL, `name` TEXT NOT NULL, `presence` INTEGER NOT NULL, `absence` INTEGER NOT NULL, `exemption` INTEGER NOT NULL, `lateness` INTEGER NOT NULL, `excused` INTEGER NOT NULL, `deleted` INTEGER NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "diaryId",
+            "columnName": "diary_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "number",
+            "columnName": "number",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "name",
+            "columnName": "name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "presence",
+            "columnName": "presence",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "absence",
+            "columnName": "absence",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "exemption",
+            "columnName": "exemption",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "lateness",
+            "columnName": "lateness",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "excused",
+            "columnName": "excused",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "deleted",
+            "columnName": "deleted",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "AttendanceSummary",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `diary_id` INTEGER NOT NULL, `subject_id` INTEGER NOT NULL, `month` INTEGER NOT NULL, `presence` INTEGER NOT NULL, `absence` INTEGER NOT NULL, `absence_excused` INTEGER NOT NULL, `absence_for_school_reasons` INTEGER NOT NULL, `lateness` INTEGER NOT NULL, `lateness_excused` INTEGER NOT NULL, `exemption` INTEGER NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "diaryId",
+            "columnName": "diary_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subjectId",
+            "columnName": "subject_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "month",
+            "columnName": "month",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "presence",
+            "columnName": "presence",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "absence",
+            "columnName": "absence",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "absenceExcused",
+            "columnName": "absence_excused",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "absenceForSchoolReasons",
+            "columnName": "absence_for_school_reasons",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "lateness",
+            "columnName": "lateness",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "latenessExcused",
+            "columnName": "lateness_excused",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "exemption",
+            "columnName": "exemption",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Grades",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `is_read` INTEGER NOT NULL, `is_notified` INTEGER NOT NULL, `semester_id` INTEGER NOT NULL, `student_id` INTEGER NOT NULL, `subject` TEXT NOT NULL, `entry` TEXT NOT NULL, `value` INTEGER NOT NULL, `modifier` REAL NOT NULL, `comment` TEXT NOT NULL, `color` TEXT NOT NULL, `grade_symbol` TEXT NOT NULL, `description` TEXT NOT NULL, `weight` TEXT NOT NULL, `weightValue` REAL NOT NULL, `date` INTEGER NOT NULL, `teacher` TEXT NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "isRead",
+            "columnName": "is_read",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "isNotified",
+            "columnName": "is_notified",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "semesterId",
+            "columnName": "semester_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "entry",
+            "columnName": "entry",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "value",
+            "columnName": "value",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "modifier",
+            "columnName": "modifier",
+            "affinity": "REAL",
+            "notNull": true
+          },
+          {
+            "fieldPath": "comment",
+            "columnName": "comment",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "color",
+            "columnName": "color",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "gradeSymbol",
+            "columnName": "grade_symbol",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "description",
+            "columnName": "description",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "weight",
+            "columnName": "weight",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "weightValue",
+            "columnName": "weightValue",
+            "affinity": "REAL",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacher",
+            "columnName": "teacher",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "GradesSummary",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `semester_id` INTEGER NOT NULL, `student_id` INTEGER NOT NULL, `position` INTEGER NOT NULL, `subject` TEXT NOT NULL, `predicted_grade` TEXT NOT NULL, `final_grade` TEXT NOT NULL, `proposed_points` TEXT NOT NULL, `final_points` TEXT NOT NULL, `points_sum` TEXT NOT NULL, `average` REAL NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "semesterId",
+            "columnName": "semester_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "position",
+            "columnName": "position",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "predictedGrade",
+            "columnName": "predicted_grade",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "finalGrade",
+            "columnName": "final_grade",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "proposedPoints",
+            "columnName": "proposed_points",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "finalPoints",
+            "columnName": "final_points",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "pointsSum",
+            "columnName": "points_sum",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "average",
+            "columnName": "average",
+            "affinity": "REAL",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "GradesStatistics",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `semester_id` INTEGER NOT NULL, `subject` TEXT NOT NULL, `grade` INTEGER NOT NULL, `amount` INTEGER NOT NULL, `is_semester` INTEGER NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "semesterId",
+            "columnName": "semester_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "grade",
+            "columnName": "grade",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "amount",
+            "columnName": "amount",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "semester",
+            "columnName": "is_semester",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Messages",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `is_notified` INTEGER NOT NULL, `content` TEXT, `student_id` INTEGER NOT NULL, `real_id` INTEGER NOT NULL, `message_id` INTEGER NOT NULL, `sender_name` TEXT NOT NULL, `sender_id` INTEGER NOT NULL, `recipient_name` TEXT NOT NULL, `subject` TEXT NOT NULL, `date` INTEGER NOT NULL, `folder_id` INTEGER NOT NULL, `unread` INTEGER NOT NULL, `unread_by` INTEGER NOT NULL, `read_by` INTEGER NOT NULL, `removed` INTEGER NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "isNotified",
+            "columnName": "is_notified",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "content",
+            "columnName": "content",
+            "affinity": "TEXT",
+            "notNull": false
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "realId",
+            "columnName": "real_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "messageId",
+            "columnName": "message_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "sender",
+            "columnName": "sender_name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "senderId",
+            "columnName": "sender_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "recipient",
+            "columnName": "recipient_name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "folderId",
+            "columnName": "folder_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "unread",
+            "columnName": "unread",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "unreadBy",
+            "columnName": "unread_by",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "readBy",
+            "columnName": "read_by",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "removed",
+            "columnName": "removed",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Notes",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `is_read` INTEGER NOT NULL, `is_notified` INTEGER NOT NULL, `student_id` INTEGER NOT NULL, `date` INTEGER NOT NULL, `teacher` TEXT NOT NULL, `category` TEXT NOT NULL, `content` TEXT NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "isRead",
+            "columnName": "is_read",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "isNotified",
+            "columnName": "is_notified",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacher",
+            "columnName": "teacher",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "category",
+            "columnName": "category",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "content",
+            "columnName": "content",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Homework",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `semester_id` INTEGER NOT NULL, `student_id` INTEGER NOT NULL, `date` INTEGER NOT NULL, `entry_date` INTEGER NOT NULL, `subject` TEXT NOT NULL, `content` TEXT NOT NULL, `teacher` TEXT NOT NULL, `teacher_symbol` TEXT NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "semesterId",
+            "columnName": "semester_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "entryDate",
+            "columnName": "entry_date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "content",
+            "columnName": "content",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacher",
+            "columnName": "teacher",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacherSymbol",
+            "columnName": "teacher_symbol",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Subjects",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `diary_id` INTEGER NOT NULL, `real_id` INTEGER NOT NULL, `name` TEXT NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "diaryId",
+            "columnName": "diary_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "realId",
+            "columnName": "real_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "name",
+            "columnName": "name",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "LuckyNumbers",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `is_notified` INTEGER NOT NULL, `student_id` INTEGER NOT NULL, `date` INTEGER NOT NULL, `lucky_number` INTEGER NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "isNotified",
+            "columnName": "is_notified",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "luckyNumber",
+            "columnName": "lucky_number",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "CompletedLesson",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `diary_id` INTEGER NOT NULL, `date` INTEGER NOT NULL, `number` INTEGER NOT NULL, `subject` TEXT NOT NULL, `topic` TEXT NOT NULL, `teacher` TEXT NOT NULL, `teacher_symbol` TEXT NOT NULL, `substitution` TEXT NOT NULL, `absence` TEXT NOT NULL, `resources` TEXT NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "diaryId",
+            "columnName": "diary_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "number",
+            "columnName": "number",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "topic",
+            "columnName": "topic",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacher",
+            "columnName": "teacher",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacherSymbol",
+            "columnName": "teacher_symbol",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "substitution",
+            "columnName": "substitution",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "absence",
+            "columnName": "absence",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "resources",
+            "columnName": "resources",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "ReportingUnits",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `real_id` INTEGER NOT NULL, `short` TEXT NOT NULL, `sender_id` INTEGER NOT NULL, `sender_name` TEXT NOT NULL, `roles` TEXT NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "realId",
+            "columnName": "real_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "shortName",
+            "columnName": "short",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "senderId",
+            "columnName": "sender_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "senderName",
+            "columnName": "sender_name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "roles",
+            "columnName": "roles",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Recipients",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `real_id` TEXT NOT NULL, `name` TEXT NOT NULL, `real_name` TEXT NOT NULL, `login_id` INTEGER NOT NULL, `unit_id` INTEGER NOT NULL, `role` INTEGER NOT NULL, `hash` TEXT NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "realId",
+            "columnName": "real_id",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "name",
+            "columnName": "name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "realName",
+            "columnName": "real_name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "loginId",
+            "columnName": "login_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "unitId",
+            "columnName": "unit_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "role",
+            "columnName": "role",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "hash",
+            "columnName": "hash",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      }
+    ],
+    "views": [],
+    "setupQueries": [
+      "CREATE TABLE IF NOT EXISTS room_master_table (id INTEGER PRIMARY KEY,identity_hash TEXT)",
+      "INSERT OR REPLACE INTO room_master_table (id,identity_hash) VALUES(42, 'b22945c41e7841ff2e6b16af346dde0c')"
+    ]
+  }
+}
\ No newline at end of file
diff --git a/app/schemas/io.github.wulkanowy.data.db.AppDatabase/15.json b/app/schemas/io.github.wulkanowy.data.db.AppDatabase/15.json
new file mode 100644
index 00000000..6f2d1d1d
--- /dev/null
+++ b/app/schemas/io.github.wulkanowy.data.db.AppDatabase/15.json
@@ -0,0 +1,1430 @@
+{
+  "formatVersion": 1,
+  "database": {
+    "version": 15,
+    "identityHash": "84b300bf53c7dd70b60a29a842275bb2",
+    "entities": [
+      {
+        "tableName": "Students",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `endpoint` TEXT NOT NULL, `loginType` TEXT NOT NULL, `email` TEXT NOT NULL, `password` TEXT NOT NULL, `symbol` TEXT NOT NULL, `student_id` INTEGER NOT NULL, `student_name` TEXT NOT NULL, `school_id` TEXT NOT NULL, `school_name` TEXT NOT NULL, `class_name` TEXT NOT NULL, `class_id` INTEGER NOT NULL, `is_current` INTEGER NOT NULL, `registration_date` INTEGER NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "endpoint",
+            "columnName": "endpoint",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "loginType",
+            "columnName": "loginType",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "email",
+            "columnName": "email",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "password",
+            "columnName": "password",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "symbol",
+            "columnName": "symbol",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentName",
+            "columnName": "student_name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "schoolSymbol",
+            "columnName": "school_id",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "schoolName",
+            "columnName": "school_name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "className",
+            "columnName": "class_name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "classId",
+            "columnName": "class_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "isCurrent",
+            "columnName": "is_current",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "registrationDate",
+            "columnName": "registration_date",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [
+          {
+            "name": "index_Students_email_symbol_student_id_school_id_class_id",
+            "unique": true,
+            "columnNames": [
+              "email",
+              "symbol",
+              "student_id",
+              "school_id",
+              "class_id"
+            ],
+            "createSql": "CREATE UNIQUE INDEX `index_Students_email_symbol_student_id_school_id_class_id` ON `${TABLE_NAME}` (`email`, `symbol`, `student_id`, `school_id`, `class_id`)"
+          }
+        ],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Semesters",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `diary_id` INTEGER NOT NULL, `diary_name` TEXT NOT NULL, `school_year` INTEGER NOT NULL, `semester_id` INTEGER NOT NULL, `semester_name` INTEGER NOT NULL, `is_current` INTEGER NOT NULL, `start` INTEGER NOT NULL, `end` INTEGER NOT NULL, `class_id` INTEGER NOT NULL, `unit_id` INTEGER NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "diaryId",
+            "columnName": "diary_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "diaryName",
+            "columnName": "diary_name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "schoolYear",
+            "columnName": "school_year",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "semesterId",
+            "columnName": "semester_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "semesterName",
+            "columnName": "semester_name",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "isCurrent",
+            "columnName": "is_current",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "start",
+            "columnName": "start",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "end",
+            "columnName": "end",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "classId",
+            "columnName": "class_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "unitId",
+            "columnName": "unit_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [
+          {
+            "name": "index_Semesters_student_id_diary_id_semester_id",
+            "unique": true,
+            "columnNames": [
+              "student_id",
+              "diary_id",
+              "semester_id"
+            ],
+            "createSql": "CREATE UNIQUE INDEX `index_Semesters_student_id_diary_id_semester_id` ON `${TABLE_NAME}` (`student_id`, `diary_id`, `semester_id`)"
+          }
+        ],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Exams",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `diary_id` INTEGER NOT NULL, `date` INTEGER NOT NULL, `entry_date` INTEGER NOT NULL, `subject` TEXT NOT NULL, `group` TEXT NOT NULL, `type` TEXT NOT NULL, `description` TEXT NOT NULL, `teacher` TEXT NOT NULL, `teacher_symbol` TEXT NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "diaryId",
+            "columnName": "diary_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "entryDate",
+            "columnName": "entry_date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "group",
+            "columnName": "group",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "type",
+            "columnName": "type",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "description",
+            "columnName": "description",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacher",
+            "columnName": "teacher",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacherSymbol",
+            "columnName": "teacher_symbol",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Timetable",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `diary_id` INTEGER NOT NULL, `number` INTEGER NOT NULL, `start` INTEGER NOT NULL, `end` INTEGER NOT NULL, `date` INTEGER NOT NULL, `subject` TEXT NOT NULL, `subjectOld` TEXT NOT NULL, `group` TEXT NOT NULL, `room` TEXT NOT NULL, `roomOld` TEXT NOT NULL, `teacher` TEXT NOT NULL, `teacherOld` TEXT NOT NULL, `info` TEXT NOT NULL, `changes` INTEGER NOT NULL, `canceled` INTEGER NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "diaryId",
+            "columnName": "diary_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "number",
+            "columnName": "number",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "start",
+            "columnName": "start",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "end",
+            "columnName": "end",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subjectOld",
+            "columnName": "subjectOld",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "group",
+            "columnName": "group",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "room",
+            "columnName": "room",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "roomOld",
+            "columnName": "roomOld",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacher",
+            "columnName": "teacher",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacherOld",
+            "columnName": "teacherOld",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "info",
+            "columnName": "info",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "changes",
+            "columnName": "changes",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "canceled",
+            "columnName": "canceled",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Attendance",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `diary_id` INTEGER NOT NULL, `date` INTEGER NOT NULL, `number` INTEGER NOT NULL, `subject` TEXT NOT NULL, `name` TEXT NOT NULL, `presence` INTEGER NOT NULL, `absence` INTEGER NOT NULL, `exemption` INTEGER NOT NULL, `lateness` INTEGER NOT NULL, `excused` INTEGER NOT NULL, `deleted` INTEGER NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "diaryId",
+            "columnName": "diary_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "number",
+            "columnName": "number",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "name",
+            "columnName": "name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "presence",
+            "columnName": "presence",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "absence",
+            "columnName": "absence",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "exemption",
+            "columnName": "exemption",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "lateness",
+            "columnName": "lateness",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "excused",
+            "columnName": "excused",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "deleted",
+            "columnName": "deleted",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "AttendanceSummary",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `diary_id` INTEGER NOT NULL, `subject_id` INTEGER NOT NULL, `month` INTEGER NOT NULL, `presence` INTEGER NOT NULL, `absence` INTEGER NOT NULL, `absence_excused` INTEGER NOT NULL, `absence_for_school_reasons` INTEGER NOT NULL, `lateness` INTEGER NOT NULL, `lateness_excused` INTEGER NOT NULL, `exemption` INTEGER NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "diaryId",
+            "columnName": "diary_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subjectId",
+            "columnName": "subject_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "month",
+            "columnName": "month",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "presence",
+            "columnName": "presence",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "absence",
+            "columnName": "absence",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "absenceExcused",
+            "columnName": "absence_excused",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "absenceForSchoolReasons",
+            "columnName": "absence_for_school_reasons",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "lateness",
+            "columnName": "lateness",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "latenessExcused",
+            "columnName": "lateness_excused",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "exemption",
+            "columnName": "exemption",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Grades",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `is_read` INTEGER NOT NULL, `is_notified` INTEGER NOT NULL, `semester_id` INTEGER NOT NULL, `student_id` INTEGER NOT NULL, `subject` TEXT NOT NULL, `entry` TEXT NOT NULL, `value` INTEGER NOT NULL, `modifier` REAL NOT NULL, `comment` TEXT NOT NULL, `color` TEXT NOT NULL, `grade_symbol` TEXT NOT NULL, `description` TEXT NOT NULL, `weight` TEXT NOT NULL, `weightValue` REAL NOT NULL, `date` INTEGER NOT NULL, `teacher` TEXT NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "isRead",
+            "columnName": "is_read",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "isNotified",
+            "columnName": "is_notified",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "semesterId",
+            "columnName": "semester_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "entry",
+            "columnName": "entry",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "value",
+            "columnName": "value",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "modifier",
+            "columnName": "modifier",
+            "affinity": "REAL",
+            "notNull": true
+          },
+          {
+            "fieldPath": "comment",
+            "columnName": "comment",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "color",
+            "columnName": "color",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "gradeSymbol",
+            "columnName": "grade_symbol",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "description",
+            "columnName": "description",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "weight",
+            "columnName": "weight",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "weightValue",
+            "columnName": "weightValue",
+            "affinity": "REAL",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacher",
+            "columnName": "teacher",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "GradesSummary",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `semester_id` INTEGER NOT NULL, `student_id` INTEGER NOT NULL, `position` INTEGER NOT NULL, `subject` TEXT NOT NULL, `predicted_grade` TEXT NOT NULL, `final_grade` TEXT NOT NULL, `proposed_points` TEXT NOT NULL, `final_points` TEXT NOT NULL, `points_sum` TEXT NOT NULL, `average` REAL NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "semesterId",
+            "columnName": "semester_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "position",
+            "columnName": "position",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "predictedGrade",
+            "columnName": "predicted_grade",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "finalGrade",
+            "columnName": "final_grade",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "proposedPoints",
+            "columnName": "proposed_points",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "finalPoints",
+            "columnName": "final_points",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "pointsSum",
+            "columnName": "points_sum",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "average",
+            "columnName": "average",
+            "affinity": "REAL",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "GradesStatistics",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `semester_id` INTEGER NOT NULL, `subject` TEXT NOT NULL, `grade` INTEGER NOT NULL, `amount` INTEGER NOT NULL, `is_semester` INTEGER NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "semesterId",
+            "columnName": "semester_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "grade",
+            "columnName": "grade",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "amount",
+            "columnName": "amount",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "semester",
+            "columnName": "is_semester",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Messages",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `is_notified` INTEGER NOT NULL, `content` TEXT, `student_id` INTEGER NOT NULL, `real_id` INTEGER NOT NULL, `message_id` INTEGER NOT NULL, `sender_name` TEXT NOT NULL, `sender_id` INTEGER NOT NULL, `recipient_name` TEXT NOT NULL, `subject` TEXT NOT NULL, `date` INTEGER NOT NULL, `folder_id` INTEGER NOT NULL, `unread` INTEGER NOT NULL, `unread_by` INTEGER NOT NULL, `read_by` INTEGER NOT NULL, `removed` INTEGER NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "isNotified",
+            "columnName": "is_notified",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "content",
+            "columnName": "content",
+            "affinity": "TEXT",
+            "notNull": false
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "realId",
+            "columnName": "real_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "messageId",
+            "columnName": "message_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "sender",
+            "columnName": "sender_name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "senderId",
+            "columnName": "sender_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "recipient",
+            "columnName": "recipient_name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "folderId",
+            "columnName": "folder_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "unread",
+            "columnName": "unread",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "unreadBy",
+            "columnName": "unread_by",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "readBy",
+            "columnName": "read_by",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "removed",
+            "columnName": "removed",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Notes",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `is_read` INTEGER NOT NULL, `is_notified` INTEGER NOT NULL, `student_id` INTEGER NOT NULL, `date` INTEGER NOT NULL, `teacher` TEXT NOT NULL, `category` TEXT NOT NULL, `content` TEXT NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "isRead",
+            "columnName": "is_read",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "isNotified",
+            "columnName": "is_notified",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacher",
+            "columnName": "teacher",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "category",
+            "columnName": "category",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "content",
+            "columnName": "content",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Homework",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `semester_id` INTEGER NOT NULL, `student_id` INTEGER NOT NULL, `date` INTEGER NOT NULL, `entry_date` INTEGER NOT NULL, `subject` TEXT NOT NULL, `content` TEXT NOT NULL, `teacher` TEXT NOT NULL, `teacher_symbol` TEXT NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "semesterId",
+            "columnName": "semester_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "entryDate",
+            "columnName": "entry_date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "content",
+            "columnName": "content",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacher",
+            "columnName": "teacher",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacherSymbol",
+            "columnName": "teacher_symbol",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Subjects",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `diary_id` INTEGER NOT NULL, `real_id` INTEGER NOT NULL, `name` TEXT NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "diaryId",
+            "columnName": "diary_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "realId",
+            "columnName": "real_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "name",
+            "columnName": "name",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "LuckyNumbers",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `is_notified` INTEGER NOT NULL, `student_id` INTEGER NOT NULL, `date` INTEGER NOT NULL, `lucky_number` INTEGER NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "isNotified",
+            "columnName": "is_notified",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "luckyNumber",
+            "columnName": "lucky_number",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "CompletedLesson",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `diary_id` INTEGER NOT NULL, `date` INTEGER NOT NULL, `number` INTEGER NOT NULL, `subject` TEXT NOT NULL, `topic` TEXT NOT NULL, `teacher` TEXT NOT NULL, `teacher_symbol` TEXT NOT NULL, `substitution` TEXT NOT NULL, `absence` TEXT NOT NULL, `resources` TEXT NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "diaryId",
+            "columnName": "diary_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "number",
+            "columnName": "number",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "topic",
+            "columnName": "topic",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacher",
+            "columnName": "teacher",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "teacherSymbol",
+            "columnName": "teacher_symbol",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "substitution",
+            "columnName": "substitution",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "absence",
+            "columnName": "absence",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "resources",
+            "columnName": "resources",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "ReportingUnits",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `real_id` INTEGER NOT NULL, `short` TEXT NOT NULL, `sender_id` INTEGER NOT NULL, `sender_name` TEXT NOT NULL, `roles` TEXT NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "realId",
+            "columnName": "real_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "shortName",
+            "columnName": "short",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "senderId",
+            "columnName": "sender_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "senderName",
+            "columnName": "sender_name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "roles",
+            "columnName": "roles",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "Recipients",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `real_id` TEXT NOT NULL, `name` TEXT NOT NULL, `real_name` TEXT NOT NULL, `login_id` INTEGER NOT NULL, `unit_id` INTEGER NOT NULL, `role` INTEGER NOT NULL, `hash` TEXT NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "realId",
+            "columnName": "real_id",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "name",
+            "columnName": "name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "realName",
+            "columnName": "real_name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "loginId",
+            "columnName": "login_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "unitId",
+            "columnName": "unit_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "role",
+            "columnName": "role",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "hash",
+            "columnName": "hash",
+            "affinity": "TEXT",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      },
+      {
+        "tableName": "MobileDevices",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `student_id` INTEGER NOT NULL, `device_id` INTEGER NOT NULL, `name` TEXT NOT NULL, `date` INTEGER NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "studentId",
+            "columnName": "student_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "deviceId",
+            "columnName": "device_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "name",
+            "columnName": "name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "date",
+            "columnName": "date",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "columnNames": [
+            "id"
+          ],
+          "autoGenerate": true
+        },
+        "indices": [],
+        "foreignKeys": []
+      }
+    ],
+    "views": [],
+    "setupQueries": [
+      "CREATE TABLE IF NOT EXISTS room_master_table (id INTEGER PRIMARY KEY,identity_hash TEXT)",
+      "INSERT OR REPLACE INTO room_master_table (id,identity_hash) VALUES(42, '84b300bf53c7dd70b60a29a842275bb2')"
+    ]
+  }
+}
\ No newline at end of file
diff --git a/app/sonarqube.gradle b/app/sonarqube.gradle
index 52fd2dd8..3dad1034 100644
--- a/app/sonarqube.gradle
+++ b/app/sonarqube.gradle
@@ -29,5 +29,6 @@ sonarqube {
         property "sonar.java.coveragePlugin", "jacoco"
         property "sonar.android.lint.report", "build/reports/lint-results.xml"
         property "sonar.jacoco.reportPaths", fileTree(dir: project.projectDir, includes: ['**/*.exec', '**/*.ec'])
+        property "sonar.coverage.jacoco.xmlReportPaths", "build/reports/jacocoTestReport/jacocoTestReport.xml"
     }
 }
diff --git a/app/src/androidTest/java/io/github/wulkanowy/data/db/migrations/AbstractMigrationTest.kt b/app/src/androidTest/java/io/github/wulkanowy/data/db/migrations/AbstractMigrationTest.kt
index 507105f6..f720663b 100644
--- a/app/src/androidTest/java/io/github/wulkanowy/data/db/migrations/AbstractMigrationTest.kt
+++ b/app/src/androidTest/java/io/github/wulkanowy/data/db/migrations/AbstractMigrationTest.kt
@@ -22,7 +22,12 @@ abstract class AbstractMigrationTest {
     fun getMigratedRoomDatabase(): AppDatabase {
         val database = Room.databaseBuilder(ApplicationProvider.getApplicationContext(),
             AppDatabase::class.java, dbName)
-            .addMigrations(Migration12(), Migration13())
+            .addMigrations(
+                Migration12(),
+                Migration13(),
+                Migration14(),
+                Migration15()
+            )
             .build()
         // close the database and release any stream resources when the test finishes
         helper.closeWhenFinished(database)
diff --git a/app/src/androidTest/java/io/github/wulkanowy/data/repositories/timetable/TestTimetableEntityCreator.kt b/app/src/androidTest/java/io/github/wulkanowy/data/repositories/timetable/TestTimetableEntityCreator.kt
index 438e95f4..eea5463d 100644
--- a/app/src/androidTest/java/io/github/wulkanowy/data/repositories/timetable/TestTimetableEntityCreator.kt
+++ b/app/src/androidTest/java/io/github/wulkanowy/data/repositories/timetable/TestTimetableEntityCreator.kt
@@ -7,7 +7,7 @@ import org.threeten.bp.LocalDateTime.now
 import io.github.wulkanowy.api.timetable.Timetable as TimetableRemote
 import io.github.wulkanowy.data.db.entities.Timetable as TimetableLocal
 
-fun createTimetableLocal(number: Int, start: LocalDateTime, room: String = "", subject: String = ""): TimetableLocal {
+fun createTimetableLocal(number: Int, start: LocalDateTime, room: String = "", subject: String = "", teacher: String = ""): TimetableLocal {
     return TimetableLocal(
         studentId = 1,
         diaryId = 2,
@@ -20,7 +20,7 @@ fun createTimetableLocal(number: Int, start: LocalDateTime, room: String = "", s
         group = "",
         room = room,
         roomOld = "",
-        teacher = "",
+        teacher = teacher,
         teacherOld = "",
         info = "",
         changes = false,
@@ -28,7 +28,7 @@ fun createTimetableLocal(number: Int, start: LocalDateTime, room: String = "", s
     )
 }
 
-fun createTimetableRemote(number: Int, start: LocalDateTime, room: String, subject: String = ""): TimetableRemote {
+fun createTimetableRemote(number: Int, start: LocalDateTime, room: String, subject: String = "", teacher: String = ""): TimetableRemote {
     return TimetableRemote(
         number = number,
         start = start.toDate(),
@@ -37,7 +37,7 @@ fun createTimetableRemote(number: Int, start: LocalDateTime, room: String, subje
         subject = subject,
         group = "",
         room = room,
-        teacher = "",
+        teacher = teacher,
         info = "",
         changes = false,
         canceled = false
diff --git a/app/src/androidTest/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepositoryTest.kt b/app/src/androidTest/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepositoryTest.kt
index 1c080263..79216d55 100644
--- a/app/src/androidTest/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepositoryTest.kt
+++ b/app/src/androidTest/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepositoryTest.kt
@@ -63,23 +63,27 @@ class TimetableRepositoryTest {
     fun copyDetailsToCompletedFromPrevious() {
         timetableLocal.saveTimetable(listOf(
             createTimetableLocal(1, of(2019, 3, 5, 8, 0), "123", "Przyroda"),
-            createTimetableLocal(1, of(2019, 3, 5, 8, 50), "321", "Religia"),
-            createTimetableLocal(1, of(2019, 3, 5, 9, 40), "213", "W-F")
+            createTimetableLocal(2, of(2019, 3, 5, 8, 50), "321", "Religia"),
+            createTimetableLocal(3, of(2019, 3, 5, 9, 40), "213", "W-F"),
+            createTimetableLocal(4, of(2019, 3, 5, 10, 30), "213", "W-F", "Jan Kowalski")
         ))
 
         every { mockApi.getTimetable(any(), any()) } returns Single.just(listOf(
             createTimetableRemote(1, of(2019, 3, 5, 8, 0), "", "Przyroda"),
-            createTimetableRemote(1, of(2019, 3, 5, 8, 50), "", "Religia"),
-            createTimetableRemote(1, of(2019, 3, 5, 9, 40), "", "W-F")
+            createTimetableRemote(2, of(2019, 3, 5, 8, 50), "", "Religia"),
+            createTimetableRemote(3, of(2019, 3, 5, 9, 40), "", "W-F"),
+            createTimetableRemote(4, of(2019, 3, 5, 10, 30), "", "W-F")
         ))
 
         val lessons = TimetableRepository(settings, timetableLocal, timetableRemote)
             .getTimetable(semesterMock, LocalDate.of(2019, 3, 5), LocalDate.of(2019, 3, 5), true)
             .blockingGet()
 
-        assertEquals(3, lessons.size)
+        assertEquals(4, lessons.size)
         assertEquals("123", lessons[0].room)
         assertEquals("321", lessons[1].room)
         assertEquals("213", lessons[2].room)
+
+        assertEquals("", lessons[3].teacher)
     }
 }
diff --git a/app/src/fdroid/java/io/github/wulkanowy/utils/CrashlyticsUtils.kt b/app/src/fdroid/java/io/github/wulkanowy/utils/CrashlyticsUtils.kt
new file mode 100644
index 00000000..be4c0ebe
--- /dev/null
+++ b/app/src/fdroid/java/io/github/wulkanowy/utils/CrashlyticsUtils.kt
@@ -0,0 +1,17 @@
+@file:Suppress("UNUSED_PARAMETER")
+
+package io.github.wulkanowy.utils
+
+import android.content.Context
+import timber.log.Timber
+
+fun initCrashlytics(context: Context, appInfo: AppInfo) {
+    // do nothing
+}
+
+class CrashlyticsTree : Timber.Tree() {
+
+    override fun log(priority: Int, tag: String?, message: String, t: Throwable?) {
+        // do nothing
+    }
+}
diff --git a/app/src/fdroid/java/io/github/wulkanowy/utils/FirebaseAnalyticsHelper.kt b/app/src/fdroid/java/io/github/wulkanowy/utils/FirebaseAnalyticsHelper.kt
new file mode 100644
index 00000000..0b1274f1
--- /dev/null
+++ b/app/src/fdroid/java/io/github/wulkanowy/utils/FirebaseAnalyticsHelper.kt
@@ -0,0 +1,13 @@
+package io.github.wulkanowy.utils
+
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Singleton
+class FirebaseAnalyticsHelper @Inject constructor() {
+
+    @Suppress("UNUSED_PARAMETER")
+    fun logEvent(name: String, vararg params: Pair<String, Any?>) {
+        // do nothing
+    }
+}
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 2a214b8b..5e4292f6 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -4,8 +4,6 @@
     package="io.github.wulkanowy"
     android:installLocation="internalOnly">
 
-    <uses-sdk tools:overrideLibrary="com.readystatesoftware.chuck" />
-
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
@@ -80,7 +78,6 @@
                 android:name="android.appwidget.provider"
                 android:resource="@xml/provider_widget_timetable" />
         </receiver>
-
         <receiver
             android:name=".ui.modules.luckynumberwidget.LuckyNumberWidgetProvider"
             android:label="@string/lucky_number_title">
diff --git a/app/src/main/java/io/github/wulkanowy/WulkanowyApp.kt b/app/src/main/java/io/github/wulkanowy/WulkanowyApp.kt
index a58a9804..85070edc 100644
--- a/app/src/main/java/io/github/wulkanowy/WulkanowyApp.kt
+++ b/app/src/main/java/io/github/wulkanowy/WulkanowyApp.kt
@@ -1,24 +1,23 @@
 package io.github.wulkanowy
 
 import android.content.Context
+import android.util.Log.INFO
+import android.util.Log.VERBOSE
 import androidx.multidex.MultiDex
 import androidx.work.Configuration
 import androidx.work.WorkManager
-import com.crashlytics.android.Crashlytics
-import com.crashlytics.android.core.CrashlyticsCore
 import com.jakewharton.threetenabp.AndroidThreeTen
 import dagger.android.AndroidInjector
 import dagger.android.support.DaggerApplication
 import eu.davidea.flexibleadapter.FlexibleAdapter
 import eu.davidea.flexibleadapter.utils.Log
-import io.fabric.sdk.android.Fabric
-import io.github.wulkanowy.BuildConfig.CRASHLYTICS_ENABLED
-import io.github.wulkanowy.BuildConfig.DEBUG
 import io.github.wulkanowy.di.DaggerAppComponent
 import io.github.wulkanowy.services.sync.SyncWorkerFactory
 import io.github.wulkanowy.utils.ActivityLifecycleLogger
+import io.github.wulkanowy.utils.AppInfo
 import io.github.wulkanowy.utils.CrashlyticsTree
 import io.github.wulkanowy.utils.DebugLogTree
+import io.github.wulkanowy.utils.initCrashlytics
 import io.reactivex.exceptions.UndeliverableException
 import io.reactivex.plugins.RxJavaPlugins
 import timber.log.Timber
@@ -30,6 +29,9 @@ class WulkanowyApp : DaggerApplication() {
     @Inject
     lateinit var workerFactory: SyncWorkerFactory
 
+    @Inject
+    lateinit var appInfo: AppInfo
+
     override fun attachBaseContext(base: Context?) {
         super.attachBaseContext(base)
         MultiDex.install(this)
@@ -38,15 +40,23 @@ class WulkanowyApp : DaggerApplication() {
     override fun onCreate() {
         super.onCreate()
         AndroidThreeTen.init(this)
-        WorkManager.initialize(this, Configuration.Builder().setWorkerFactory(workerFactory).build())
         RxJavaPlugins.setErrorHandler(::onError)
 
-        initCrashlytics()
+        initWorkManager()
         initLogging()
+        initCrashlytics(this, appInfo)
+    }
+
+    private fun initWorkManager() {
+        WorkManager.initialize(this,
+            Configuration.Builder()
+                .setWorkerFactory(workerFactory)
+                .setMinimumLoggingLevel(if (appInfo.isDebug) VERBOSE else INFO)
+                .build())
     }
 
     private fun initLogging() {
-        if (DEBUG) {
+        if (appInfo.isDebug) {
             Timber.plant(DebugLogTree())
             FlexibleAdapter.enableLogs(Log.Level.DEBUG)
         } else {
@@ -55,15 +65,11 @@ class WulkanowyApp : DaggerApplication() {
         registerActivityLifecycleCallbacks(ActivityLifecycleLogger())
     }
 
-    private fun initCrashlytics() {
-        Fabric.with(Fabric.Builder(this).kits(
-            Crashlytics.Builder().core(CrashlyticsCore.Builder().disabled(!CRASHLYTICS_ENABLED).build()).build()
-        ).debuggable(DEBUG).build())
-    }
-
     private fun onError(error: Throwable) {
-        if (error is UndeliverableException && error.cause is IOException || error.cause is InterruptedException) {
-            Timber.e(error.cause, "An undeliverable error occurred")
+        //RxJava's too deep stack traces may cause SOE on older android devices
+        val cause = error.cause
+        if (error is UndeliverableException && cause is IOException || cause is InterruptedException || cause is StackOverflowError) {
+            Timber.e(cause, "An undeliverable error occurred")
         } else throw error
     }
 
diff --git a/app/src/main/java/io/github/wulkanowy/data/RepositoryModule.kt b/app/src/main/java/io/github/wulkanowy/data/RepositoryModule.kt
index c832368a..97da6bb8 100644
--- a/app/src/main/java/io/github/wulkanowy/data/RepositoryModule.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/RepositoryModule.kt
@@ -132,4 +132,8 @@ internal class RepositoryModule {
     @Singleton
     @Provides
     fun provideRecipientDao(database: AppDatabase) = database.recipientDao
+
+    @Singleton
+    @Provides
+    fun provideMobileDevicesDao(database: AppDatabase) = database.mobileDeviceDao
 }
diff --git a/app/src/main/java/io/github/wulkanowy/data/db/AppDatabase.kt b/app/src/main/java/io/github/wulkanowy/data/db/AppDatabase.kt
index d867583e..a97a3042 100644
--- a/app/src/main/java/io/github/wulkanowy/data/db/AppDatabase.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/db/AppDatabase.kt
@@ -16,6 +16,7 @@ import io.github.wulkanowy.data.db.dao.GradeSummaryDao
 import io.github.wulkanowy.data.db.dao.HomeworkDao
 import io.github.wulkanowy.data.db.dao.LuckyNumberDao
 import io.github.wulkanowy.data.db.dao.MessagesDao
+import io.github.wulkanowy.data.db.dao.MobileDeviceDao
 import io.github.wulkanowy.data.db.dao.NoteDao
 import io.github.wulkanowy.data.db.dao.RecipientDao
 import io.github.wulkanowy.data.db.dao.ReportingUnitDao
@@ -33,6 +34,7 @@ import io.github.wulkanowy.data.db.entities.GradeSummary
 import io.github.wulkanowy.data.db.entities.Homework
 import io.github.wulkanowy.data.db.entities.LuckyNumber
 import io.github.wulkanowy.data.db.entities.Message
+import io.github.wulkanowy.data.db.entities.MobileDevice
 import io.github.wulkanowy.data.db.entities.Note
 import io.github.wulkanowy.data.db.entities.Recipient
 import io.github.wulkanowy.data.db.entities.ReportingUnit
@@ -44,6 +46,8 @@ import io.github.wulkanowy.data.db.migrations.Migration10
 import io.github.wulkanowy.data.db.migrations.Migration11
 import io.github.wulkanowy.data.db.migrations.Migration12
 import io.github.wulkanowy.data.db.migrations.Migration13
+import io.github.wulkanowy.data.db.migrations.Migration14
+import io.github.wulkanowy.data.db.migrations.Migration15
 import io.github.wulkanowy.data.db.migrations.Migration2
 import io.github.wulkanowy.data.db.migrations.Migration3
 import io.github.wulkanowy.data.db.migrations.Migration4
@@ -73,7 +77,8 @@ import javax.inject.Singleton
         LuckyNumber::class,
         CompletedLesson::class,
         ReportingUnit::class,
-        Recipient::class
+        Recipient::class,
+        MobileDevice::class
     ],
     version = AppDatabase.VERSION_SCHEMA,
     exportSchema = true
@@ -82,7 +87,7 @@ import javax.inject.Singleton
 abstract class AppDatabase : RoomDatabase() {
 
     companion object {
-        const val VERSION_SCHEMA = 13
+        const val VERSION_SCHEMA = 15
 
         fun newInstance(context: Context): AppDatabase {
             return Room.databaseBuilder(context, AppDatabase::class.java, "wulkanowy_database")
@@ -101,7 +106,9 @@ abstract class AppDatabase : RoomDatabase() {
                     Migration10(),
                     Migration11(),
                     Migration12(),
-                    Migration13()
+                    Migration13(),
+                    Migration14(),
+                    Migration15()
                 )
                 .build()
         }
@@ -140,4 +147,6 @@ abstract class AppDatabase : RoomDatabase() {
     abstract val reportingUnitDao: ReportingUnitDao
 
     abstract val recipientDao: RecipientDao
+
+    abstract val mobileDeviceDao: MobileDeviceDao
 }
diff --git a/app/src/main/java/io/github/wulkanowy/data/db/dao/MessagesDao.kt b/app/src/main/java/io/github/wulkanowy/data/db/dao/MessagesDao.kt
index 3ef5d690..4f72c6c9 100644
--- a/app/src/main/java/io/github/wulkanowy/data/db/dao/MessagesDao.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/db/dao/MessagesDao.kt
@@ -23,8 +23,8 @@ interface MessagesDao {
     @Query("SELECT * FROM Messages WHERE student_id = :studentId AND folder_id = :folder AND removed = 0 ORDER BY date DESC")
     fun loadAll(studentId: Int, folder: Int): Maybe<List<Message>>
 
-    @Query("SELECT * FROM Messages WHERE student_id = :studentId AND real_id = :id")
-    fun load(studentId: Int, id: Int): Maybe<Message>
+    @Query("SELECT * FROM Messages WHERE id = :id")
+    fun load(id: Long): Maybe<Message>
 
     @Query("SELECT * FROM Messages WHERE student_id = :studentId AND removed = 1 ORDER BY date DESC")
     fun loadDeleted(studentId: Int): Maybe<List<Message>>
diff --git a/app/src/main/java/io/github/wulkanowy/data/db/dao/MobileDeviceDao.kt b/app/src/main/java/io/github/wulkanowy/data/db/dao/MobileDeviceDao.kt
new file mode 100644
index 00000000..d6b97f6a
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/data/db/dao/MobileDeviceDao.kt
@@ -0,0 +1,21 @@
+package io.github.wulkanowy.data.db.dao
+
+import androidx.room.Dao
+import androidx.room.Delete
+import androidx.room.Insert
+import androidx.room.Query
+import io.github.wulkanowy.data.db.entities.MobileDevice
+import io.reactivex.Maybe
+
+@Dao
+interface MobileDeviceDao {
+
+    @Insert
+    fun insertAll(devices: List<MobileDevice>)
+
+    @Delete
+    fun deleteAll(devices: List<MobileDevice>)
+
+    @Query("SELECT * FROM MobileDevices WHERE student_id = :studentId ORDER BY date DESC")
+    fun loadAll(studentId: Int): Maybe<List<MobileDevice>>
+}
diff --git a/app/src/main/java/io/github/wulkanowy/data/db/entities/GradeSummary.kt b/app/src/main/java/io/github/wulkanowy/data/db/entities/GradeSummary.kt
index e6ac4926..6e29112b 100644
--- a/app/src/main/java/io/github/wulkanowy/data/db/entities/GradeSummary.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/db/entities/GradeSummary.kt
@@ -13,11 +13,26 @@ data class GradeSummary(
     @ColumnInfo(name = "student_id")
     val studentId: Int,
 
+    val position: Int,
+
     val subject: String,
 
+    @ColumnInfo(name = "predicted_grade")
     val predictedGrade: String,
 
-    val finalGrade: String
+    @ColumnInfo(name = "final_grade")
+    val finalGrade: String,
+
+    @ColumnInfo(name = "proposed_points")
+    val proposedPoints: String,
+
+    @ColumnInfo(name = "final_points")
+    val finalPoints: String,
+
+    @ColumnInfo(name = "points_sum")
+    val pointsSum: String,
+
+    val average: Double
 ) {
     @PrimaryKey(autoGenerate = true)
     var id: Long = 0
diff --git a/app/src/main/java/io/github/wulkanowy/data/db/entities/MobileDevice.kt b/app/src/main/java/io/github/wulkanowy/data/db/entities/MobileDevice.kt
new file mode 100644
index 00000000..f67ed599
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/data/db/entities/MobileDevice.kt
@@ -0,0 +1,25 @@
+package io.github.wulkanowy.data.db.entities
+
+import androidx.room.ColumnInfo
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+import org.threeten.bp.LocalDateTime
+import java.io.Serializable
+
+@Entity(tableName = "MobileDevices")
+data class MobileDevice(
+
+    @ColumnInfo(name = "student_id")
+    val studentId: Int,
+
+    @ColumnInfo(name = "device_id")
+    val deviceId: Int,
+
+    val name: String,
+
+    val date: LocalDateTime
+) : Serializable {
+
+    @PrimaryKey(autoGenerate = true)
+    var id: Long = 0
+}
diff --git a/app/src/main/java/io/github/wulkanowy/data/db/migrations/Migration14.kt b/app/src/main/java/io/github/wulkanowy/data/db/migrations/Migration14.kt
new file mode 100644
index 00000000..4dac0d30
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/data/db/migrations/Migration14.kt
@@ -0,0 +1,26 @@
+package io.github.wulkanowy.data.db.migrations
+
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
+
+class Migration14 : Migration(13, 14) {
+
+    override fun migrate(database: SupportSQLiteDatabase) {
+        database.execSQL("DROP TABLE IF EXISTS GradesSummary")
+        database.execSQL("""
+            CREATE TABLE IF NOT EXISTS GradesSummary (
+                id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
+                semester_id INTEGER NOT NULL,
+                student_id INTEGER NOT NULL,
+                position INTEGER NOT NULL,
+                subject TEXT NOT NULL,
+                predicted_grade TEXT NOT NULL,
+                final_grade TEXT NOT NULL,
+                proposed_points TEXT NOT NULL,
+                final_points TEXT NOT NULL,
+                points_sum TEXT NOT NULL,
+                average REAL NOT NULL
+            )
+        """)
+    }
+}
diff --git a/app/src/main/java/io/github/wulkanowy/data/db/migrations/Migration15.kt b/app/src/main/java/io/github/wulkanowy/data/db/migrations/Migration15.kt
new file mode 100644
index 00000000..5be49a95
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/data/db/migrations/Migration15.kt
@@ -0,0 +1,19 @@
+package io.github.wulkanowy.data.db.migrations
+
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
+
+class Migration15 : Migration(14, 15) {
+
+    override fun migrate(database: SupportSQLiteDatabase) {
+        database.execSQL("""
+            CREATE TABLE IF NOT EXISTS MobileDevices (
+                id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
+                student_id INTEGER NOT NULL,
+                device_id INTEGER NOT NULL,
+                name TEXT NOT NULL,
+                date INTEGER NOT NULL
+            )
+        """)
+    }
+}
diff --git a/app/src/main/java/io/github/wulkanowy/data/pojos/MobileDeviceToken.kt b/app/src/main/java/io/github/wulkanowy/data/pojos/MobileDeviceToken.kt
new file mode 100644
index 00000000..40101821
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/data/pojos/MobileDeviceToken.kt
@@ -0,0 +1,12 @@
+package io.github.wulkanowy.data.pojos
+
+data class MobileDeviceToken(
+
+    val token: String,
+
+    val symbol: String,
+
+    val pin: String,
+
+    val qr: String
+)
diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/gradessummary/GradeSummaryRemote.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/gradessummary/GradeSummaryRemote.kt
index d395decf..3335cfb0 100644
--- a/app/src/main/java/io/github/wulkanowy/data/repositories/gradessummary/GradeSummaryRemote.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/gradessummary/GradeSummaryRemote.kt
@@ -18,9 +18,14 @@ class GradeSummaryRemote @Inject constructor(private val api: Api) {
                     GradeSummary(
                         semesterId = semester.semesterId,
                         studentId = semester.studentId,
+                        position = it.order,
                         subject = it.name,
                         predictedGrade = it.predicted,
-                        finalGrade = it.final
+                        finalGrade = it.final,
+                        pointsSum = it.pointsSum,
+                        proposedPoints = it.proposedPoints,
+                        finalPoints = it.finalPoints,
+                        average = it.average
                     )
                 }
             }
diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/message/MessageLocal.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/message/MessageLocal.kt
index 411cca39..ce08d13e 100644
--- a/app/src/main/java/io/github/wulkanowy/data/repositories/message/MessageLocal.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/message/MessageLocal.kt
@@ -23,8 +23,8 @@ class MessageLocal @Inject constructor(private val messagesDb: MessagesDao) {
         messagesDb.deleteAll(messages)
     }
 
-    fun getMessage(student: Student, id: Int): Maybe<Message> {
-        return messagesDb.load(student.id.toInt(), id)
+    fun getMessage(id: Long): Maybe<Message> {
+        return messagesDb.load(id)
     }
 
     fun getMessages(student: Student, folder: MessageFolder): Maybe<List<Message>> {
diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/message/MessageRepository.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/message/MessageRepository.kt
index b68f7f71..c10cd518 100644
--- a/app/src/main/java/io/github/wulkanowy/data/repositories/message/MessageRepository.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/message/MessageRepository.kt
@@ -46,14 +46,14 @@ class MessageRepository @Inject constructor(
             }
     }
 
-    fun getMessage(student: Student, messageId: Int, markAsRead: Boolean = false): Single<Message> {
+    fun getMessage(student: Student, messageDbId: Long, markAsRead: Boolean = false): Single<Message> {
         return Single.just(apiHelper.initApi(student))
             .flatMap { _ ->
-                local.getMessage(student, messageId)
+                local.getMessage(messageDbId)
                     .filter { !it.content.isNullOrEmpty() }
                     .switchIfEmpty(ReactiveNetwork.checkInternetConnectivity(settings)
                         .flatMap {
-                            if (it) local.getMessage(student, messageId).toSingle()
+                            if (it) local.getMessage(messageDbId).toSingle()
                             else Single.error(UnknownHostException())
                         }
                         .flatMap { dbMessage ->
@@ -64,7 +64,7 @@ class MessageRepository @Inject constructor(
                                 }))
                             }
                         }.flatMap {
-                            local.getMessage(student, messageId).toSingle()
+                            local.getMessage(messageDbId).toSingle()
                         }
                     )
             }
diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/mobiledevice/MobileDeviceLocal.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/mobiledevice/MobileDeviceLocal.kt
new file mode 100644
index 00000000..8f0efa5b
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/mobiledevice/MobileDeviceLocal.kt
@@ -0,0 +1,25 @@
+package io.github.wulkanowy.data.repositories.mobiledevice
+
+import io.github.wulkanowy.data.db.dao.MobileDeviceDao
+import io.github.wulkanowy.data.db.entities.MobileDevice
+import io.github.wulkanowy.data.db.entities.Semester
+import io.github.wulkanowy.data.db.entities.Student
+import io.reactivex.Maybe
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Singleton
+class MobileDeviceLocal @Inject constructor(private val mobileDb: MobileDeviceDao) {
+
+    fun saveDevices(devices: List<MobileDevice>) {
+        mobileDb.insertAll(devices)
+    }
+
+    fun deleteDevices(devices: List<MobileDevice>) {
+        mobileDb.deleteAll(devices)
+    }
+
+    fun getDevices(semester: Semester): Maybe<List<MobileDevice>> {
+        return mobileDb.loadAll(semester.studentId).filter { it.isNotEmpty() }
+    }
+}
diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/mobiledevice/MobileDeviceRemote.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/mobiledevice/MobileDeviceRemote.kt
new file mode 100644
index 00000000..86fdce97
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/mobiledevice/MobileDeviceRemote.kt
@@ -0,0 +1,47 @@
+package io.github.wulkanowy.data.repositories.mobiledevice
+
+import io.github.wulkanowy.api.Api
+import io.github.wulkanowy.data.db.entities.MobileDevice
+import io.github.wulkanowy.data.db.entities.Semester
+import io.github.wulkanowy.data.pojos.MobileDeviceToken
+import io.github.wulkanowy.utils.toLocalDateTime
+import io.reactivex.Single
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Singleton
+class MobileDeviceRemote @Inject constructor(private val api: Api) {
+
+    fun getDevices(semester: Semester): Single<List<MobileDevice>> {
+        return Single.just(api.apply { diaryId = semester.diaryId })
+            .flatMap { api.getRegisteredDevices() }
+            .map { devices ->
+                devices.map {
+                    MobileDevice(
+                        studentId = semester.studentId,
+                        date = it.date.toLocalDateTime(),
+                        deviceId = it.id,
+                        name = it.name
+                    )
+                }
+            }
+    }
+
+    fun unregisterDevice(semester: Semester, device: MobileDevice): Single<Boolean> {
+        return Single.just(api.apply { diaryId = semester.diaryId })
+            .flatMap { api.unregisterDevice(device.deviceId) }
+    }
+
+    fun getToken(semester: Semester): Single<MobileDeviceToken> {
+        return Single.just(api.apply { diaryId = semester.diaryId })
+            .flatMap { api.getToken() }
+            .map {
+                MobileDeviceToken(
+                    token = it.token,
+                    symbol = it.symbol,
+                    pin = it.pin,
+                    qr = it.qrCodeImage
+                )
+            }
+    }
+}
diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/mobiledevice/MobileDeviceRepository.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/mobiledevice/MobileDeviceRepository.kt
new file mode 100644
index 00000000..ac450ff4
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/mobiledevice/MobileDeviceRepository.kt
@@ -0,0 +1,52 @@
+package io.github.wulkanowy.data.repositories.mobiledevice
+
+import com.github.pwittchen.reactivenetwork.library.rx2.ReactiveNetwork
+import com.github.pwittchen.reactivenetwork.library.rx2.internet.observing.InternetObservingSettings
+import io.github.wulkanowy.data.db.entities.MobileDevice
+import io.github.wulkanowy.data.db.entities.Semester
+import io.github.wulkanowy.data.pojos.MobileDeviceToken
+import io.github.wulkanowy.utils.uniqueSubtract
+import io.reactivex.Single
+import java.net.UnknownHostException
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Singleton
+class MobileDeviceRepository @Inject constructor(
+    private val settings: InternetObservingSettings,
+    private val local: MobileDeviceLocal,
+    private val remote: MobileDeviceRemote
+) {
+
+    fun getDevices(semester: Semester, forceRefresh: Boolean = false): Single<List<MobileDevice>> {
+        return local.getDevices(semester).filter { !forceRefresh }
+            .switchIfEmpty(ReactiveNetwork.checkInternetConnectivity(settings)
+                .flatMap {
+                    if (it) remote.getDevices(semester)
+                    else Single.error(UnknownHostException())
+                }.flatMap { new ->
+                    local.getDevices(semester).toSingle(emptyList())
+                        .doOnSuccess { old ->
+                            local.deleteDevices(old uniqueSubtract new)
+                            local.saveDevices(new uniqueSubtract old)
+                        }
+                }
+            ).flatMap { local.getDevices(semester).toSingle(emptyList()) }
+    }
+
+    fun unregisterDevice(semester: Semester, device: MobileDevice): Single<Boolean> {
+        return ReactiveNetwork.checkInternetConnectivity(settings)
+            .flatMap {
+                if (it) remote.unregisterDevice(semester, device)
+                else Single.error(UnknownHostException())
+            }
+    }
+
+    fun getToken(semester: Semester): Single<MobileDeviceToken> {
+        return ReactiveNetwork.checkInternetConnectivity(settings)
+            .flatMap {
+                if (it) remote.getToken(semester)
+                else Single.error(UnknownHostException())
+            }
+    }
+}
diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/preferences/PreferencesRepository.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/preferences/PreferencesRepository.kt
index 91717ed7..bb9a39b1 100644
--- a/app/src/main/java/io/github/wulkanowy/data/repositories/preferences/PreferencesRepository.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/preferences/PreferencesRepository.kt
@@ -20,6 +20,9 @@ class PreferencesRepository @Inject constructor(
     val gradeAverageMode: String
         get() = sharedPref.getString(context.getString(R.string.pref_key_grade_average_mode), "only_one_semester") ?: "only_one_semester"
 
+    val gradeAverageForceCalc: Boolean
+        get() = sharedPref.getBoolean(context.getString(R.string.pref_key_grade_average_force_calc), false)
+
     val isGradeExpandable: Boolean
         get() = !sharedPref.getBoolean(context.getString(R.string.pref_key_expand_grade), false)
 
@@ -40,7 +43,7 @@ class PreferencesRepository @Inject constructor(
 
     val servicesOnlyWifiKey: String = context.getString(R.string.pref_key_services_wifi_only)
     val isServicesOnlyWifi: Boolean
-        get() = sharedPref.getBoolean(servicesOnlyWifiKey, true)
+        get() = sharedPref.getBoolean(servicesOnlyWifiKey, false)
 
     val isNotificationsEnable: Boolean
         get() = sharedPref.getBoolean(context.getString(R.string.pref_key_notifications_enable), true)
diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/student/StudentRepository.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/student/StudentRepository.kt
index e0ab6bf6..5c4a6055 100644
--- a/app/src/main/java/io/github/wulkanowy/data/repositories/student/StudentRepository.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/student/StudentRepository.kt
@@ -22,6 +22,8 @@ class StudentRepository @Inject constructor(
 
     fun isStudentSaved(): Single<Boolean> = local.getStudents(false).isEmpty.map { !it }
 
+    fun isCurrentStudentSet(): Single<Boolean> = local.getCurrentStudent(false).isEmpty.map { !it }
+
     fun getStudents(email: String, password: String, endpoint: String, symbol: String = ""): Single<List<Student>> {
         return ReactiveNetwork.checkInternetConnectivity(settings)
             .flatMap {
diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepository.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepository.kt
index c3f23811..0e6331f9 100644
--- a/app/src/main/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepository.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepository.kt
@@ -35,8 +35,7 @@ class TimetableRepository @Inject constructor(
                                 item.apply {
                                     old.singleOrNull { this.start == it.start }?.let {
                                         return@map copy(
-                                            room = if (room.isEmpty()) it.room else room,
-                                            teacher = if (teacher.isEmpty()) it.teacher else teacher
+                                            room = if (room.isEmpty()) it.room else room
                                         )
                                     }
                                 }
diff --git a/app/src/main/java/io/github/wulkanowy/di/AppModule.kt b/app/src/main/java/io/github/wulkanowy/di/AppModule.kt
index da1d8f7a..42e50fa4 100644
--- a/app/src/main/java/io/github/wulkanowy/di/AppModule.kt
+++ b/app/src/main/java/io/github/wulkanowy/di/AppModule.kt
@@ -2,15 +2,13 @@ package io.github.wulkanowy.di
 
 import android.appwidget.AppWidgetManager
 import android.content.Context
-import com.google.firebase.analytics.FirebaseAnalytics
 import dagger.Module
 import dagger.Provides
 import eu.davidea.flexibleadapter.FlexibleAdapter
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
-import io.github.wulkanowy.BuildConfig.DEBUG
 import io.github.wulkanowy.WulkanowyApp
+import io.github.wulkanowy.utils.AppInfo
 import io.github.wulkanowy.utils.SchedulersProvider
-import javax.inject.Named
 import javax.inject.Singleton
 
 @Module
@@ -27,16 +25,11 @@ internal class AppModule {
     @Provides
     fun provideFlexibleAdapter() = FlexibleAdapter<AbstractFlexibleItem<*>>(null, null, true)
 
-    @Singleton
-    @Provides
-    fun provideFirebaseAnalytics(context: Context) = FirebaseAnalytics.getInstance(context)
-
     @Singleton
     @Provides
     fun provideAppWidgetManager(context: Context): AppWidgetManager = AppWidgetManager.getInstance(context)
 
     @Singleton
-    @Named("isDebug")
     @Provides
-    fun provideIsDebug() = DEBUG
+    fun provideAppInfo() = AppInfo()
 }
diff --git a/app/src/main/java/io/github/wulkanowy/services/sync/SyncManager.kt b/app/src/main/java/io/github/wulkanowy/services/sync/SyncManager.kt
index c1820afb..d85c75c3 100644
--- a/app/src/main/java/io/github/wulkanowy/services/sync/SyncManager.kt
+++ b/app/src/main/java/io/github/wulkanowy/services/sync/SyncManager.kt
@@ -6,34 +6,50 @@ import androidx.work.BackoffPolicy.EXPONENTIAL
 import androidx.work.Constraints
 import androidx.work.ExistingPeriodicWorkPolicy.KEEP
 import androidx.work.ExistingPeriodicWorkPolicy.REPLACE
-import androidx.work.NetworkType.METERED
+import androidx.work.NetworkType.CONNECTED
 import androidx.work.NetworkType.UNMETERED
 import androidx.work.PeriodicWorkRequest
 import androidx.work.WorkManager
+import io.github.wulkanowy.data.db.SharedPrefHelper
 import io.github.wulkanowy.data.repositories.preferences.PreferencesRepository
 import io.github.wulkanowy.services.sync.channels.DebugChannel
 import io.github.wulkanowy.services.sync.channels.NewEntriesChannel
+import io.github.wulkanowy.utils.AppInfo
 import io.github.wulkanowy.utils.isHolidays
 import org.threeten.bp.LocalDate.now
 import timber.log.Timber
 import java.util.concurrent.TimeUnit.MINUTES
 import javax.inject.Inject
-import javax.inject.Named
 import javax.inject.Singleton
 
 @Singleton
 class SyncManager @Inject constructor(
     private val workManager: WorkManager,
     private val preferencesRepository: PreferencesRepository,
+    sharedPrefHelper: SharedPrefHelper,
     newEntriesChannel: NewEntriesChannel,
     debugChannel: DebugChannel,
-    @Named("isDebug") isDebug: Boolean
+    appInfo: AppInfo
 ) {
 
+    companion object {
+
+        private const val APP_VERSION_CODE_KEY = "app_version_code"
+    }
+
     init {
-        if (SDK_INT >= O) newEntriesChannel.create()
-        if (SDK_INT >= O && isDebug) debugChannel.create()
         if (now().isHolidays) stopSyncWorker()
+
+        if (SDK_INT > O) {
+            newEntriesChannel.create()
+            if (appInfo.isDebug) debugChannel.create()
+        }
+
+        if (sharedPrefHelper.getLong(APP_VERSION_CODE_KEY, -1L) != appInfo.versionCode.toLong()) {
+            startSyncWorker(true)
+            sharedPrefHelper.putLong(APP_VERSION_CODE_KEY, appInfo.versionCode.toLong(), true)
+        }
+
         Timber.i("SyncManager was initialized")
     }
 
@@ -43,7 +59,7 @@ class SyncManager @Inject constructor(
                 PeriodicWorkRequest.Builder(SyncWorker::class.java, preferencesRepository.servicesInterval, MINUTES, 10, MINUTES)
                     .setBackoffCriteria(EXPONENTIAL, 30, MINUTES)
                     .setConstraints(Constraints.Builder()
-                        .setRequiredNetworkType(if (preferencesRepository.isServicesOnlyWifi) METERED else UNMETERED)
+                        .setRequiredNetworkType(if (preferencesRepository.isServicesOnlyWifi) UNMETERED else CONNECTED)
                         .build())
                     .build())
         }
diff --git a/app/src/main/java/io/github/wulkanowy/services/sync/SyncWorker.kt b/app/src/main/java/io/github/wulkanowy/services/sync/SyncWorker.kt
index 134fb034..6a4c4ca6 100644
--- a/app/src/main/java/io/github/wulkanowy/services/sync/SyncWorker.kt
+++ b/app/src/main/java/io/github/wulkanowy/services/sync/SyncWorker.kt
@@ -35,7 +35,7 @@ class SyncWorker @AssistedInject constructor(
 
     override fun createWork(): Single<Result> {
         Timber.i("SyncWorker is starting")
-        return studentRepository.isStudentSaved()
+        return studentRepository.isCurrentStudentSet()
             .filter { true }
             .flatMap { studentRepository.getCurrentStudent().toMaybe() }
             .flatMapCompletable { student ->
diff --git a/app/src/main/java/io/github/wulkanowy/ui/base/BaseActivity.kt b/app/src/main/java/io/github/wulkanowy/ui/base/BaseActivity.kt
index d8b53607..6fc72d06 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/base/BaseActivity.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/base/BaseActivity.kt
@@ -1,24 +1,27 @@
 package io.github.wulkanowy.ui.base
 
+import android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK
+import android.content.Intent.FLAG_ACTIVITY_NEW_TASK
 import android.os.Bundle
 import android.view.View
 import android.widget.Toast
+import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.app.AppCompatDelegate
-import androidx.fragment.app.Fragment
 import com.google.android.material.snackbar.Snackbar
 import com.google.android.material.snackbar.Snackbar.LENGTH_LONG
 import dagger.android.AndroidInjection
 import dagger.android.DispatchingAndroidInjector
-import dagger.android.support.HasSupportFragmentInjector
+import dagger.android.HasAndroidInjector
 import io.github.wulkanowy.R
+import io.github.wulkanowy.ui.modules.login.LoginActivity
 import io.github.wulkanowy.utils.FragmentLifecycleLogger
 import javax.inject.Inject
 
-abstract class BaseActivity : AppCompatActivity(), BaseView, HasSupportFragmentInjector {
+abstract class BaseActivity<T : BasePresenter<out BaseView>> : AppCompatActivity(), BaseView, HasAndroidInjector {
 
     @Inject
-    lateinit var supportFragmentInjector: DispatchingAndroidInjector<Fragment>
+    lateinit var androidInjector: DispatchingAndroidInjector<Any>
 
     @Inject
     lateinit var fragmentLifecycleLogger: FragmentLifecycleLogger
@@ -28,6 +31,8 @@ abstract class BaseActivity : AppCompatActivity(), BaseView, HasSupportFragmentI
 
     protected var messageContainer: View? = null
 
+    abstract var presenter: T
+
     public override fun onCreate(savedInstanceState: Bundle?) {
         AndroidInjection.inject(this)
         themeManager.applyTheme(this)
@@ -51,10 +56,25 @@ abstract class BaseActivity : AppCompatActivity(), BaseView, HasSupportFragmentI
         else Toast.makeText(this, text, Toast.LENGTH_LONG).show()
     }
 
+    override fun showExpiredDialog() {
+        AlertDialog.Builder(this)
+            .setTitle(R.string.main_session_expired)
+            .setMessage(R.string.main_session_relogin)
+            .setPositiveButton(R.string.main_log_in) { _, _ -> presenter.onExpiredLoginSelected() }
+            .setNegativeButton(android.R.string.cancel) { _, _ -> }
+            .show()
+    }
+
+    override fun openClearLoginView() {
+        startActivity(LoginActivity.getStartIntent(this)
+            .apply { addFlags(FLAG_ACTIVITY_CLEAR_TASK or FLAG_ACTIVITY_NEW_TASK) })
+    }
+
     override fun onDestroy() {
         super.onDestroy()
         invalidateOptionsMenu()
+        presenter.onDetachView()
     }
 
-    override fun supportFragmentInjector() = supportFragmentInjector
+    override fun androidInjector() = androidInjector
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/base/BaseFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/base/BaseFragment.kt
index 4beb0ac4..4b2ad053 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/base/BaseFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/base/BaseFragment.kt
@@ -18,7 +18,7 @@ abstract class BaseFragment : DaggerFragment(), BaseView {
                 }
                 .show()
         } else {
-            (activity as? BaseActivity)?.showError(text, error)
+            (activity as? BaseActivity<*>)?.showError(text, error)
         }
     }
 
@@ -26,7 +26,15 @@ abstract class BaseFragment : DaggerFragment(), BaseView {
         if (messageContainer != null) {
             Snackbar.make(messageContainer!!, text, LENGTH_LONG).show()
         } else {
-            (activity as? BaseActivity)?.showMessage(text)
+            (activity as? BaseActivity<*>)?.showMessage(text)
         }
     }
+
+    override fun showExpiredDialog() {
+        (activity as? BaseActivity<*>)?.showExpiredDialog()
+    }
+
+    override fun openClearLoginView() {
+        (activity as? BaseActivity<*>)?.openClearLoginView()
+    }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/base/BasePresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/base/BasePresenter.kt
index c5a31958..9f0b4047 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/base/BasePresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/base/BasePresenter.kt
@@ -1,8 +1,16 @@
 package io.github.wulkanowy.ui.base
 
+import io.github.wulkanowy.data.repositories.student.StudentRepository
+import io.github.wulkanowy.utils.SchedulersProvider
+import io.reactivex.Completable
 import io.reactivex.disposables.CompositeDisposable
+import timber.log.Timber
 
-open class BasePresenter<T : BaseView>(private val errorHandler: ErrorHandler) {
+open class BasePresenter<T : BaseView>(
+    protected val errorHandler: ErrorHandler,
+    protected val studentRepository: StudentRepository,
+    protected val schedulers: SchedulersProvider
+) {
 
     val disposable = CompositeDisposable()
 
@@ -10,7 +18,33 @@ open class BasePresenter<T : BaseView>(private val errorHandler: ErrorHandler) {
 
     open fun onAttachView(view: T) {
         this.view = view
-        errorHandler.showErrorMessage = { text, error -> view.showError(text, error) }
+        errorHandler.apply {
+            showErrorMessage = view::showError
+            onSessionExpired = view::showExpiredDialog
+            onNoCurrentStudent = view::openClearLoginView
+        }
+    }
+
+    fun onExpiredLoginSelected() {
+        Timber.i("Attempt to switch the student after the session expires")
+        disposable.add(studentRepository.getCurrentStudent(false)
+            .flatMapCompletable { studentRepository.logoutStudent(it) }
+            .andThen(studentRepository.getSavedStudents(false))
+            .flatMapCompletable {
+                if (it.isNotEmpty()) {
+                    Timber.i("Switching current student")
+                    studentRepository.switchStudent(it[0])
+                } else Completable.complete()
+            }
+            .subscribeOn(schedulers.backgroundThread)
+            .observeOn(schedulers.mainThread)
+            .subscribe({
+                Timber.i("Switch student result: Open login view")
+                view?.openClearLoginView()
+            }, {
+                Timber.i("Switch student result: An exception occurred")
+                errorHandler.dispatch(it)
+            }))
     }
 
     open fun onDetachView() {
diff --git a/app/src/main/java/io/github/wulkanowy/ui/base/BaseView.kt b/app/src/main/java/io/github/wulkanowy/ui/base/BaseView.kt
index d2470fd1..7681263b 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/base/BaseView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/base/BaseView.kt
@@ -5,4 +5,8 @@ interface BaseView {
     fun showError(text: String, error: Throwable)
 
     fun showMessage(text: String)
+
+    fun showExpiredDialog()
+
+    fun openClearLoginView()
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/base/ErrorHandler.kt b/app/src/main/java/io/github/wulkanowy/ui/base/ErrorHandler.kt
index 83cbf0ef..16e9a048 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/base/ErrorHandler.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/base/ErrorHandler.kt
@@ -5,7 +5,10 @@ import com.readystatesoftware.chuck.api.ChuckCollector
 import io.github.wulkanowy.R
 import io.github.wulkanowy.api.interceptor.FeatureDisabledException
 import io.github.wulkanowy.api.interceptor.ServiceUnavailableException
+import io.github.wulkanowy.api.login.BadCredentialsException
 import io.github.wulkanowy.api.login.NotLoggedInException
+import io.github.wulkanowy.data.exceptions.NoCurrentStudentException
+import io.github.wulkanowy.utils.security.ScramblerException
 import timber.log.Timber
 import java.net.SocketTimeoutException
 import java.net.UnknownHostException
@@ -15,6 +18,10 @@ open class ErrorHandler @Inject constructor(protected val resources: Resources,
 
     var showErrorMessage: (String, Throwable) -> Unit = { _, _ -> }
 
+    var onSessionExpired: () -> Unit = {}
+
+    var onNoCurrentStudent: () -> Unit = {}
+
     fun dispatch(error: Throwable) {
         chuckCollector.onError(error.javaClass.simpleName, error)
         Timber.e(error, "An exception occurred while the Wulkanowy was running")
@@ -22,17 +29,23 @@ open class ErrorHandler @Inject constructor(protected val resources: Resources,
     }
 
     protected open fun proceed(error: Throwable) {
-        showErrorMessage((when (error) {
-            is UnknownHostException -> resources.getString(R.string.error_no_internet)
-            is SocketTimeoutException -> resources.getString(R.string.error_timeout)
-            is NotLoggedInException -> resources.getString(R.string.error_login_failed)
-            is ServiceUnavailableException -> resources.getString(R.string.error_service_unavailable)
-            is FeatureDisabledException -> resources.getString(R.string.error_feature_disabled)
-            else -> resources.getString(R.string.error_unknown)
-        }), error)
+        resources.run {
+            when (error) {
+                is UnknownHostException -> showErrorMessage(getString(R.string.error_no_internet), error)
+                is SocketTimeoutException -> showErrorMessage(getString(R.string.error_timeout), error)
+                is NotLoggedInException -> showErrorMessage(getString(R.string.error_login_failed), error)
+                is ServiceUnavailableException -> showErrorMessage(getString(R.string.error_service_unavailable), error)
+                is FeatureDisabledException -> showErrorMessage(getString(R.string.error_feature_disabled), error)
+                is ScramblerException, is BadCredentialsException -> onSessionExpired()
+                is NoCurrentStudentException -> onNoCurrentStudent()
+                else -> showErrorMessage(getString(R.string.error_unknown), error)
+            }
+        }
     }
 
     open fun clear() {
         showErrorMessage = { _, _ -> }
+        onSessionExpired = {}
+        onNoCurrentStudent = {}
     }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/base/session/BaseSessionFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/base/session/BaseSessionFragment.kt
deleted file mode 100644
index 110729d4..00000000
--- a/app/src/main/java/io/github/wulkanowy/ui/base/session/BaseSessionFragment.kt
+++ /dev/null
@@ -1,21 +0,0 @@
-package io.github.wulkanowy.ui.base.session
-
-import android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK
-import android.content.Intent.FLAG_ACTIVITY_NEW_TASK
-import io.github.wulkanowy.ui.base.BaseFragment
-import io.github.wulkanowy.ui.modules.login.LoginActivity
-import io.github.wulkanowy.ui.modules.main.MainActivity
-
-open class BaseSessionFragment : BaseFragment(), BaseSessionView {
-
-    override fun showExpiredDialog() {
-        (activity as? MainActivity)?.showExpiredDialog()
-    }
-
-    override fun openLoginView() {
-        activity?.also {
-            startActivity(LoginActivity.getStartIntent(it)
-                .apply { addFlags(FLAG_ACTIVITY_CLEAR_TASK or FLAG_ACTIVITY_NEW_TASK) })
-        }
-    }
-}
diff --git a/app/src/main/java/io/github/wulkanowy/ui/base/session/BaseSessionPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/base/session/BaseSessionPresenter.kt
deleted file mode 100644
index 2c9f50ea..00000000
--- a/app/src/main/java/io/github/wulkanowy/ui/base/session/BaseSessionPresenter.kt
+++ /dev/null
@@ -1,15 +0,0 @@
-package io.github.wulkanowy.ui.base.session
-
-import io.github.wulkanowy.ui.base.BasePresenter
-
-open class BaseSessionPresenter<T : BaseSessionView>(private val errorHandler: SessionErrorHandler) :
-    BasePresenter<T>(errorHandler) {
-
-    override fun onAttachView(view: T) {
-        super.onAttachView(view)
-        errorHandler.apply {
-            onDecryptionFail = { view.showExpiredDialog() }
-            onNoCurrentStudent = { view.openLoginView() }
-        }
-    }
-}
diff --git a/app/src/main/java/io/github/wulkanowy/ui/base/session/BaseSessionView.kt b/app/src/main/java/io/github/wulkanowy/ui/base/session/BaseSessionView.kt
deleted file mode 100644
index 619c2863..00000000
--- a/app/src/main/java/io/github/wulkanowy/ui/base/session/BaseSessionView.kt
+++ /dev/null
@@ -1,10 +0,0 @@
-package io.github.wulkanowy.ui.base.session
-
-import io.github.wulkanowy.ui.base.BaseView
-
-interface BaseSessionView : BaseView {
-
-    fun showExpiredDialog()
-
-    fun openLoginView()
-}
diff --git a/app/src/main/java/io/github/wulkanowy/ui/base/session/SessionErrorHandler.kt b/app/src/main/java/io/github/wulkanowy/ui/base/session/SessionErrorHandler.kt
deleted file mode 100644
index 017eabba..00000000
--- a/app/src/main/java/io/github/wulkanowy/ui/base/session/SessionErrorHandler.kt
+++ /dev/null
@@ -1,32 +0,0 @@
-package io.github.wulkanowy.ui.base.session
-
-import android.content.res.Resources
-import com.readystatesoftware.chuck.api.ChuckCollector
-import io.github.wulkanowy.data.exceptions.NoCurrentStudentException
-import io.github.wulkanowy.ui.base.ErrorHandler
-import io.github.wulkanowy.utils.security.ScramblerException
-import javax.inject.Inject
-
-open class SessionErrorHandler @Inject constructor(
-    resources: Resources,
-    chuckCollector: ChuckCollector
-) : ErrorHandler(resources, chuckCollector) {
-
-    var onDecryptionFail: () -> Unit = {}
-
-    var onNoCurrentStudent: () -> Unit = {}
-
-    override fun proceed(error: Throwable) {
-        when (error) {
-            is ScramblerException -> onDecryptionFail()
-            is NoCurrentStudentException -> onNoCurrentStudent()
-            else -> super.proceed(error)
-        }
-    }
-
-    override fun clear() {
-        super.clear()
-        onDecryptionFail = {}
-        onNoCurrentStudent = {}
-    }
-}
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/about/AboutFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/about/AboutFragment.kt
index 8d07566f..79373be9 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/about/AboutFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/about/AboutFragment.kt
@@ -8,10 +8,10 @@ import android.view.View
 import android.view.ViewGroup
 import com.mikepenz.aboutlibraries.LibsBuilder
 import com.mikepenz.aboutlibraries.LibsFragmentCompat
-import io.github.wulkanowy.BuildConfig
 import io.github.wulkanowy.R
 import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.modules.main.MainView
+import io.github.wulkanowy.utils.AppInfo
 import io.github.wulkanowy.utils.openInternetBrowser
 import io.github.wulkanowy.utils.withOnExtraListener
 import javax.inject.Inject
@@ -24,6 +24,9 @@ class AboutFragment : BaseFragment(), AboutView, MainView.TitledView {
     @Inject
     lateinit var fragmentCompat: LibsFragmentCompat
 
+    @Inject
+    lateinit var appInfo: AppInfo
+
     companion object {
         fun newInstance() = AboutFragment()
     }
@@ -71,9 +74,9 @@ class AboutFragment : BaseFragment(), AboutView, MainView.TitledView {
             putExtra(Intent.EXTRA_EMAIL, Array(1) { "wulkanowyinc@gmail.com" })
             putExtra(Intent.EXTRA_SUBJECT, "Zgłoszenie błędu")
             putExtra(Intent.EXTRA_TEXT, "Tu umieść treść zgłoszenia\n\n" + "-".repeat(40) + "\n" + """
-                Build: ${BuildConfig.VERSION_CODE}
-                SDK: ${android.os.Build.VERSION.SDK_INT}
-                Device: ${android.os.Build.MANUFACTURER} ${android.os.Build.MODEL}
+                Build: ${appInfo.versionCode}
+                SDK: ${appInfo.systemVersion}
+                Device: ${appInfo.systemManufacturer} ${appInfo.systemModel}
             """.trimIndent())
         }
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/about/AboutPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/about/AboutPresenter.kt
index 0b6db107..736bf0ce 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/about/AboutPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/about/AboutPresenter.kt
@@ -4,16 +4,20 @@ import com.mikepenz.aboutlibraries.Libs
 import com.mikepenz.aboutlibraries.Libs.SpecialButton.SPECIAL1
 import com.mikepenz.aboutlibraries.Libs.SpecialButton.SPECIAL2
 import com.mikepenz.aboutlibraries.Libs.SpecialButton.SPECIAL3
+import io.github.wulkanowy.data.repositories.student.StudentRepository
 import io.github.wulkanowy.ui.base.BasePresenter
 import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
+import io.github.wulkanowy.utils.SchedulersProvider
 import timber.log.Timber
 import javax.inject.Inject
 
 class AboutPresenter @Inject constructor(
+    schedulers: SchedulersProvider,
     errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val analytics: FirebaseAnalyticsHelper
-) : BasePresenter<AboutView>(errorHandler) {
+) : BasePresenter<AboutView>(errorHandler, studentRepository, schedulers) {
 
     override fun onAttachView(view: AboutView) {
         super.onAttachView(view)
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/account/AccountDialog.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/account/AccountDialog.kt
index 1eaa07c1..f23a1eb5 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/account/AccountDialog.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/account/AccountDialog.kt
@@ -1,7 +1,5 @@
 package io.github.wulkanowy.ui.modules.account
 
-import android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK
-import android.content.Intent.FLAG_ACTIVITY_NEW_TASK
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
@@ -14,6 +12,7 @@ import eu.davidea.flexibleadapter.FlexibleAdapter
 import eu.davidea.flexibleadapter.common.SmoothScrollLinearLayoutManager
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.R
+import io.github.wulkanowy.ui.base.BaseActivity
 import io.github.wulkanowy.ui.modules.login.LoginActivity
 import io.github.wulkanowy.utils.setOnItemClickListener
 import kotlinx.android.synthetic.main.dialog_account.*
@@ -73,16 +72,17 @@ class AccountDialog : DaggerAppCompatDialogFragment(), AccountView {
     }
 
     override fun openLoginView() {
-        activity?.also {
+        activity?.let {
             startActivity(LoginActivity.getStartIntent(it))
         }
     }
 
+    override fun showExpiredDialog() {
+        (activity as? BaseActivity<*>)?.showExpiredDialog()
+    }
+
     override fun openClearLoginView() {
-        activity?.also {
-            startActivity(LoginActivity.getStartIntent(it)
-                .apply { addFlags(FLAG_ACTIVITY_CLEAR_TASK or FLAG_ACTIVITY_NEW_TASK) })
-        }
+        (activity as? BaseActivity<*>)?.openClearLoginView()
     }
 
     override fun showConfirmDialog() {
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/account/AccountPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/account/AccountPresenter.kt
index a16c544a..e9b4b81e 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/account/AccountPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/account/AccountPresenter.kt
@@ -11,11 +11,11 @@ import timber.log.Timber
 import javax.inject.Inject
 
 class AccountPresenter @Inject constructor(
-    private val errorHandler: ErrorHandler,
-    private val studentRepository: StudentRepository,
-    private val syncManager: SyncManager,
-    private val schedulers: SchedulersProvider
-) : BasePresenter<AccountView>(errorHandler) {
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
+    private val syncManager: SyncManager
+) : BasePresenter<AccountView>(errorHandler, studentRepository, schedulers) {
 
     override fun onAttachView(view: AccountView) {
         super.onAttachView(view)
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/account/AccountView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/account/AccountView.kt
index 74662cf4..ede5023b 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/account/AccountView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/account/AccountView.kt
@@ -14,8 +14,6 @@ interface AccountView : BaseView {
 
     fun openLoginView()
 
-    fun openClearLoginView()
-
     fun recreateMainView()
 }
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/AttendanceFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/AttendanceFragment.kt
index e5d8150d..f3131098 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/AttendanceFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/AttendanceFragment.kt
@@ -13,7 +13,7 @@ import eu.davidea.flexibleadapter.common.SmoothScrollLinearLayoutManager
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.R
 import io.github.wulkanowy.data.db.entities.Attendance
-import io.github.wulkanowy.ui.base.session.BaseSessionFragment
+import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.modules.attendance.summary.AttendanceSummaryFragment
 import io.github.wulkanowy.ui.modules.main.MainActivity
 import io.github.wulkanowy.ui.modules.main.MainView
@@ -21,7 +21,7 @@ import io.github.wulkanowy.utils.setOnItemClickListener
 import kotlinx.android.synthetic.main.fragment_attendance.*
 import javax.inject.Inject
 
-class AttendanceFragment : BaseSessionFragment(), AttendanceView, MainView.MainChildView, MainView.TitledView {
+class AttendanceFragment : BaseFragment(), AttendanceView, MainView.MainChildView, MainView.TitledView {
 
     @Inject
     lateinit var presenter: AttendancePresenter
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/AttendancePresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/AttendancePresenter.kt
index ec3d57e3..df311f78 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/AttendancePresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/AttendancePresenter.kt
@@ -1,15 +1,15 @@
 package io.github.wulkanowy.ui.modules.attendance
 
-import com.google.firebase.analytics.FirebaseAnalytics.Param.START_DATE
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.data.repositories.attendance.AttendanceRepository
 import io.github.wulkanowy.data.repositories.preferences.PreferencesRepository
 import io.github.wulkanowy.data.repositories.semester.SemesterRepository
 import io.github.wulkanowy.data.repositories.student.StudentRepository
-import io.github.wulkanowy.ui.base.session.BaseSessionPresenter
-import io.github.wulkanowy.ui.base.session.SessionErrorHandler
+import io.github.wulkanowy.ui.base.BasePresenter
+import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
+import io.github.wulkanowy.utils.getLastSchoolDayIfHoliday
 import io.github.wulkanowy.utils.isHolidays
 import io.github.wulkanowy.utils.nextSchoolDay
 import io.github.wulkanowy.utils.previousOrSameSchoolDay
@@ -23,14 +23,16 @@ import java.util.concurrent.TimeUnit.MILLISECONDS
 import javax.inject.Inject
 
 class AttendancePresenter @Inject constructor(
-    private val errorHandler: SessionErrorHandler,
-    private val schedulers: SchedulersProvider,
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val attendanceRepository: AttendanceRepository,
-    private val studentRepository: StudentRepository,
     private val semesterRepository: SemesterRepository,
     private val prefRepository: PreferencesRepository,
     private val analytics: FirebaseAnalyticsHelper
-) : BaseSessionPresenter<AttendanceView>(errorHandler) {
+) : BasePresenter<AttendanceView>(errorHandler, studentRepository, schedulers) {
+
+    private var baseDate: LocalDate = now().previousOrSameSchoolDay
 
     lateinit var currentDate: LocalDate
         private set
@@ -39,7 +41,8 @@ class AttendancePresenter @Inject constructor(
         super.onAttachView(view)
         view.initView()
         Timber.i("Attendance view was initialized")
-        loadData(ofEpochDay(date ?: now().previousOrSameSchoolDay.toEpochDay()))
+        loadData(ofEpochDay(date ?: baseDate.toEpochDay()))
+        if (currentDate.isHolidays) setBaseDateOnHolidays()
         reloadView()
     }
 
@@ -62,7 +65,7 @@ class AttendancePresenter @Inject constructor(
         Timber.i("Attendance view is reselected")
         view?.also { view ->
             if (view.currentStackSize == 1) {
-                now().previousOrSameSchoolDay.also {
+                baseDate.also {
                     if (currentDate != it) {
                         loadData(it)
                         reloadView()
@@ -84,6 +87,20 @@ class AttendancePresenter @Inject constructor(
         return true
     }
 
+    private fun setBaseDateOnHolidays() {
+        disposable.add(studentRepository.getCurrentStudent()
+            .flatMap { semesterRepository.getCurrentSemester(it) }
+            .subscribeOn(schedulers.backgroundThread)
+            .observeOn(schedulers.mainThread)
+            .subscribe({
+                baseDate = baseDate.getLastSchoolDayIfHoliday(it.schoolYear)
+                currentDate = baseDate
+                reloadNavigation()
+            }) {
+                Timber.i("Loading semester result: An exception occurred")
+            })
+    }
+
     private fun loadData(date: LocalDate, forceRefresh: Boolean = false) {
         Timber.i("Loading attendance data started")
         currentDate = date
@@ -115,7 +132,7 @@ class AttendancePresenter @Inject constructor(
                         showEmpty(it.isEmpty())
                         showContent(it.isNotEmpty())
                     }
-                    analytics.logEvent("load_attendance", "items" to it.size, "force_refresh" to forceRefresh, START_DATE to currentDate.toFormattedString("yyyy-MM-dd"))
+                    analytics.logEvent("load_attendance", "items" to it.size, "force_refresh" to forceRefresh)
                 }) {
                     Timber.i("Loading attendance result: An exception occurred")
                     view?.run { showEmpty(isViewEmpty) }
@@ -133,8 +150,14 @@ class AttendancePresenter @Inject constructor(
             showContent(false)
             showEmpty(false)
             clearData()
-            showNextButton(!currentDate.plusDays(1).isHolidays)
+            reloadNavigation()
+        }
+    }
+
+    private fun reloadNavigation() {
+        view?.apply {
             showPreButton(!currentDate.minusDays(1).isHolidays)
+            showNextButton(!currentDate.plusDays(1).isHolidays)
             updateNavigationDay(currentDate.toFormattedString("EEEE\ndd.MM.YYYY").capitalize())
         }
     }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/AttendanceView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/AttendanceView.kt
index ef3b874b..04fe94a4 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/AttendanceView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/AttendanceView.kt
@@ -1,9 +1,9 @@
 package io.github.wulkanowy.ui.modules.attendance
 
 import io.github.wulkanowy.data.db.entities.Attendance
-import io.github.wulkanowy.ui.base.session.BaseSessionView
+import io.github.wulkanowy.ui.base.BaseView
 
-interface AttendanceView : BaseSessionView {
+interface AttendanceView : BaseView {
 
     val isViewEmpty: Boolean
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/summary/AttendanceSummaryFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/summary/AttendanceSummaryFragment.kt
index b8d2c952..1845bdda 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/summary/AttendanceSummaryFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/summary/AttendanceSummaryFragment.kt
@@ -13,13 +13,13 @@ import eu.davidea.flexibleadapter.FlexibleAdapter
 import eu.davidea.flexibleadapter.common.SmoothScrollLinearLayoutManager
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.R
-import io.github.wulkanowy.ui.base.session.BaseSessionFragment
+import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.modules.main.MainView
 import io.github.wulkanowy.utils.setOnItemSelectedListener
 import kotlinx.android.synthetic.main.fragment_attendance_summary.*
 import javax.inject.Inject
 
-class AttendanceSummaryFragment : BaseSessionFragment(), AttendanceSummaryView, MainView.TitledView {
+class AttendanceSummaryFragment : BaseFragment(), AttendanceSummaryView, MainView.TitledView {
 
     @Inject
     lateinit var presenter: AttendanceSummaryPresenter
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/summary/AttendanceSummaryPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/summary/AttendanceSummaryPresenter.kt
index 09ad8980..dc6fe5b3 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/summary/AttendanceSummaryPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/summary/AttendanceSummaryPresenter.kt
@@ -6,8 +6,8 @@ import io.github.wulkanowy.data.repositories.attendancesummary.AttendanceSummary
 import io.github.wulkanowy.data.repositories.semester.SemesterRepository
 import io.github.wulkanowy.data.repositories.student.StudentRepository
 import io.github.wulkanowy.data.repositories.subject.SubjectRepository
-import io.github.wulkanowy.ui.base.session.BaseSessionPresenter
-import io.github.wulkanowy.ui.base.session.SessionErrorHandler
+import io.github.wulkanowy.ui.base.BasePresenter
+import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
 import io.github.wulkanowy.utils.calculatePercentage
@@ -19,14 +19,14 @@ import java.util.concurrent.TimeUnit.MILLISECONDS
 import javax.inject.Inject
 
 class AttendanceSummaryPresenter @Inject constructor(
-    private val errorHandler: SessionErrorHandler,
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val attendanceSummaryRepository: AttendanceSummaryRepository,
     private val subjectRepository: SubjectRepository,
-    private val studentRepository: StudentRepository,
     private val semesterRepository: SemesterRepository,
-    private val schedulers: SchedulersProvider,
     private val analytics: FirebaseAnalyticsHelper
-) : BaseSessionPresenter<AttendanceSummaryView>(errorHandler) {
+) : BasePresenter<AttendanceSummaryView>(errorHandler, studentRepository, schedulers) {
 
     private var subjects = emptyList<Subject>()
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/summary/AttendanceSummaryView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/summary/AttendanceSummaryView.kt
index e4c36db7..50f03e20 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/summary/AttendanceSummaryView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/attendance/summary/AttendanceSummaryView.kt
@@ -1,8 +1,8 @@
 package io.github.wulkanowy.ui.modules.attendance.summary
 
-import io.github.wulkanowy.ui.base.session.BaseSessionView
+import io.github.wulkanowy.ui.base.BaseView
 
-interface AttendanceSummaryView : BaseSessionView {
+interface AttendanceSummaryView : BaseView {
 
     val isViewEmpty: Boolean
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamFragment.kt
index 8f9576f2..47f6d587 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamFragment.kt
@@ -13,14 +13,14 @@ import eu.davidea.flexibleadapter.common.SmoothScrollLinearLayoutManager
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.R
 import io.github.wulkanowy.data.db.entities.Exam
-import io.github.wulkanowy.ui.base.session.BaseSessionFragment
+import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.modules.main.MainActivity
 import io.github.wulkanowy.ui.modules.main.MainView
 import io.github.wulkanowy.utils.setOnItemClickListener
 import kotlinx.android.synthetic.main.fragment_exam.*
 import javax.inject.Inject
 
-class ExamFragment : BaseSessionFragment(), ExamView, MainView.MainChildView, MainView.TitledView {
+class ExamFragment : BaseFragment(), ExamView, MainView.MainChildView, MainView.TitledView {
 
     @Inject
     lateinit var presenter: ExamPresenter
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamPresenter.kt
index a18f7b2a..93109922 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamPresenter.kt
@@ -1,16 +1,16 @@
 package io.github.wulkanowy.ui.modules.exam
 
-import com.google.firebase.analytics.FirebaseAnalytics.Param.START_DATE
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.data.db.entities.Exam
 import io.github.wulkanowy.data.repositories.exam.ExamRepository
 import io.github.wulkanowy.data.repositories.semester.SemesterRepository
 import io.github.wulkanowy.data.repositories.student.StudentRepository
-import io.github.wulkanowy.ui.base.session.BaseSessionPresenter
-import io.github.wulkanowy.ui.base.session.SessionErrorHandler
+import io.github.wulkanowy.ui.base.BasePresenter
+import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
 import io.github.wulkanowy.utils.friday
+import io.github.wulkanowy.utils.getLastSchoolDayIfHoliday
 import io.github.wulkanowy.utils.isHolidays
 import io.github.wulkanowy.utils.monday
 import io.github.wulkanowy.utils.nextOrSameSchoolDay
@@ -23,13 +23,15 @@ import java.util.concurrent.TimeUnit.MILLISECONDS
 import javax.inject.Inject
 
 class ExamPresenter @Inject constructor(
-    private val errorHandler: SessionErrorHandler,
-    private val schedulers: SchedulersProvider,
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val examRepository: ExamRepository,
-    private val studentRepository: StudentRepository,
     private val semesterRepository: SemesterRepository,
     private val analytics: FirebaseAnalyticsHelper
-) : BaseSessionPresenter<ExamView>(errorHandler) {
+) : BasePresenter<ExamView>(errorHandler, studentRepository, schedulers) {
+
+    private var baseDate: LocalDate = now().nextOrSameSchoolDay
 
     lateinit var currentDate: LocalDate
         private set
@@ -38,7 +40,8 @@ class ExamPresenter @Inject constructor(
         super.onAttachView(view)
         view.initView()
         Timber.i("Exam view was initialized")
-        loadData(ofEpochDay(date ?: now().nextOrSameSchoolDay.toEpochDay()))
+        loadData(ofEpochDay(date ?: baseDate.toEpochDay()))
+        if (currentDate.isHolidays) setBaseDateOnHolidays()
         reloadView()
     }
 
@@ -66,7 +69,7 @@ class ExamPresenter @Inject constructor(
 
     fun onViewReselected() {
         Timber.i("Exam view is reselected")
-        now().nextOrSameSchoolDay.also {
+        baseDate.also {
             if (currentDate != it) {
                 loadData(it)
                 reloadView()
@@ -74,6 +77,20 @@ class ExamPresenter @Inject constructor(
         }
     }
 
+    private fun setBaseDateOnHolidays() {
+        disposable.add(studentRepository.getCurrentStudent()
+            .flatMap { semesterRepository.getCurrentSemester(it) }
+            .subscribeOn(schedulers.backgroundThread)
+            .observeOn(schedulers.mainThread)
+            .subscribe({
+                baseDate = baseDate.getLastSchoolDayIfHoliday(it.schoolYear)
+                currentDate = baseDate
+                reloadNavigation()
+            }) {
+                Timber.i("Loading semester result: An exception occurred")
+            })
+    }
+
     private fun loadData(date: LocalDate, forceRefresh: Boolean = false) {
         Timber.i("Loading exam data started")
         currentDate = date
@@ -82,9 +99,8 @@ class ExamPresenter @Inject constructor(
             add(studentRepository.getCurrentStudent()
                 .delay(200, MILLISECONDS)
                 .flatMap { semesterRepository.getCurrentSemester(it) }
-                .flatMap {
-                    examRepository.getExams(it, currentDate.monday, currentDate.friday, forceRefresh)
-                }.map { it.groupBy { exam -> exam.date }.toSortedMap() }
+                .flatMap { examRepository.getExams(it, currentDate.monday, currentDate.friday, forceRefresh) }
+                .map { it.groupBy { exam -> exam.date }.toSortedMap() }
                 .map { createExamItems(it) }
                 .subscribeOn(schedulers.backgroundThread)
                 .observeOn(schedulers.mainThread)
@@ -102,7 +118,7 @@ class ExamPresenter @Inject constructor(
                         showEmpty(it.isEmpty())
                         showContent(it.isNotEmpty())
                     }
-                    analytics.logEvent("load_exam", "items" to it.size, "force_refresh" to forceRefresh, START_DATE to currentDate.toFormattedString("yyyy-MM-dd"))
+                    analytics.logEvent("load_exam", "items" to it.size, "force_refresh" to forceRefresh)
                 }) {
                     Timber.i("Loading exam result: An exception occurred")
                     view?.run { showEmpty(isViewEmpty) }
@@ -127,6 +143,12 @@ class ExamPresenter @Inject constructor(
             showContent(false)
             showEmpty(false)
             clearData()
+            reloadNavigation()
+        }
+    }
+
+    private fun reloadNavigation() {
+        view?.apply {
             showPreButton(!currentDate.minusDays(7).isHolidays)
             showNextButton(!currentDate.plusDays(7).isHolidays)
             updateNavigationWeek("${currentDate.monday.toFormattedString("dd.MM")} - " +
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamView.kt
index 2ced3f2d..888cb05e 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamView.kt
@@ -1,9 +1,9 @@
 package io.github.wulkanowy.ui.modules.exam
 
 import io.github.wulkanowy.data.db.entities.Exam
-import io.github.wulkanowy.ui.base.session.BaseSessionView
+import io.github.wulkanowy.ui.base.BaseView
 
-interface ExamView : BaseSessionView {
+interface ExamView : BaseView {
 
     val isViewEmpty: Boolean
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradeAverageProvider.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradeAverageProvider.kt
index a76f3d5a..3f794ff1 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradeAverageProvider.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradeAverageProvider.kt
@@ -3,16 +3,20 @@ package io.github.wulkanowy.ui.modules.grade
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
 import io.github.wulkanowy.data.repositories.grade.GradeRepository
+import io.github.wulkanowy.data.repositories.gradessummary.GradeSummaryRepository
 import io.github.wulkanowy.data.repositories.preferences.PreferencesRepository
 import io.github.wulkanowy.utils.calcAverage
 import io.github.wulkanowy.utils.changeModifier
+import io.reactivex.Maybe
 import io.reactivex.Single
 import javax.inject.Inject
 
 class GradeAverageProvider @Inject constructor(
     private val preferencesRepository: PreferencesRepository,
-    private val gradeRepository: GradeRepository
+    private val gradeRepository: GradeRepository,
+    private val gradeSummaryRepository: GradeSummaryRepository
 ) {
+
     fun getGradeAverage(student: Student, semesters: List<Semester>, selectedSemesterId: Int, forceRefresh: Boolean): Single<Map<String, Double>> {
         return when (preferencesRepository.gradeAverageMode) {
             "all_year" -> getAllYearAverage(student, semesters, selectedSemesterId, forceRefresh)
@@ -27,16 +31,19 @@ class GradeAverageProvider @Inject constructor(
         val plusModifier = preferencesRepository.gradePlusModifier
         val minusModifier = preferencesRepository.gradeMinusModifier
 
-        return gradeRepository.getGrades(student, selectedSemester, forceRefresh)
-            .flatMap { firstGrades ->
-                if (selectedSemester == firstSemester) Single.just(firstGrades)
-                else gradeRepository.getGrades(student, firstSemester)
-                    .map { secondGrades -> secondGrades + firstGrades }
-            }.map { grades ->
-                grades.map { it.changeModifier(plusModifier, minusModifier) }
-                    .groupBy { it.subject }
-                    .mapValues { it.value.calcAverage() }
-            }
+        return getAverageFromGradeSummary(selectedSemester, forceRefresh)
+            .switchIfEmpty(gradeRepository.getGrades(student, selectedSemester, forceRefresh)
+                .flatMap { firstGrades ->
+                    if (selectedSemester == firstSemester) Single.just(firstGrades)
+                    else {
+                        gradeRepository.getGrades(student, firstSemester)
+                            .map { secondGrades -> secondGrades + firstGrades }
+                    }
+                }.map { grades ->
+                    grades.map { it.changeModifier(plusModifier, minusModifier) }
+                        .groupBy { it.subject }
+                        .mapValues { it.value.calcAverage() }
+                })
     }
 
     private fun getOnlyOneSemesterAverage(student: Student, semesters: List<Semester>, semesterId: Int, forceRefresh: Boolean): Single<Map<String, Double>> {
@@ -44,11 +51,22 @@ class GradeAverageProvider @Inject constructor(
         val plusModifier = preferencesRepository.gradePlusModifier
         val minusModifier = preferencesRepository.gradeMinusModifier
 
-        return gradeRepository.getGrades(student, selectedSemester, forceRefresh)
-            .map { grades ->
-                grades.map { it.changeModifier(plusModifier, minusModifier) }
-                    .groupBy { it.subject }
-                    .mapValues { it.value.calcAverage() }
-            }
+        return getAverageFromGradeSummary(selectedSemester, forceRefresh)
+            .switchIfEmpty(gradeRepository.getGrades(student, selectedSemester, forceRefresh)
+                .map { grades ->
+                    grades.map { it.changeModifier(plusModifier, minusModifier) }
+                        .groupBy { it.subject }
+                        .mapValues { it.value.calcAverage() }
+                })
+    }
+
+    private fun getAverageFromGradeSummary(selectedSemester: Semester, forceRefresh: Boolean): Maybe<Map<String, Double>> {
+        return gradeSummaryRepository.getGradesSummary(selectedSemester, forceRefresh)
+            .toMaybe()
+            .flatMap {
+                if (it.any { summary -> summary.average != .0 }) {
+                    Maybe.just(it.map { summary -> summary.subject to summary.average }.toMap())
+                } else Maybe.empty()
+            }.filter { !preferencesRepository.gradeAverageForceCalc }
     }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradeFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradeFragment.kt
index 182258d1..eb5e3669 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradeFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradeFragment.kt
@@ -11,8 +11,8 @@ import android.view.View.VISIBLE
 import android.view.ViewGroup
 import androidx.appcompat.app.AlertDialog
 import io.github.wulkanowy.R
+import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.base.BaseFragmentPagerAdapter
-import io.github.wulkanowy.ui.base.session.BaseSessionFragment
 import io.github.wulkanowy.ui.modules.grade.details.GradeDetailsFragment
 import io.github.wulkanowy.ui.modules.grade.statistics.GradeStatisticsFragment
 import io.github.wulkanowy.ui.modules.grade.summary.GradeSummaryFragment
@@ -21,7 +21,7 @@ import io.github.wulkanowy.utils.setOnSelectPageListener
 import kotlinx.android.synthetic.main.fragment_grade.*
 import javax.inject.Inject
 
-class GradeFragment : BaseSessionFragment(), GradeView, MainView.MainChildView, MainView.TitledView {
+class GradeFragment : BaseFragment(), GradeView, MainView.MainChildView, MainView.TitledView {
 
     @Inject
     lateinit var presenter: GradePresenter
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradePresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradePresenter.kt
index 6a8d4d58..2ee69480 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradePresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradePresenter.kt
@@ -3,20 +3,20 @@ package io.github.wulkanowy.ui.modules.grade
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.repositories.semester.SemesterRepository
 import io.github.wulkanowy.data.repositories.student.StudentRepository
-import io.github.wulkanowy.ui.base.session.BaseSessionPresenter
-import io.github.wulkanowy.ui.base.session.SessionErrorHandler
+import io.github.wulkanowy.ui.base.BasePresenter
+import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
 import timber.log.Timber
 import javax.inject.Inject
 
 class GradePresenter @Inject constructor(
-    private val errorHandler: SessionErrorHandler,
-    private val schedulers: SchedulersProvider,
-    private val studentRepository: StudentRepository,
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val semesterRepository: SemesterRepository,
     private val analytics: FirebaseAnalyticsHelper
-) : BaseSessionPresenter<GradeView>(errorHandler) {
+) : BasePresenter<GradeView>(errorHandler, studentRepository, schedulers) {
 
     var selectedIndex = 0
         private set
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradeView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradeView.kt
index 9fdd46b1..a37e6d67 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradeView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradeView.kt
@@ -1,8 +1,8 @@
 package io.github.wulkanowy.ui.modules.grade
 
-import io.github.wulkanowy.ui.base.session.BaseSessionView
+import io.github.wulkanowy.ui.base.BaseView
 
-interface GradeView : BaseSessionView {
+interface GradeView : BaseView {
 
     val currentPageIndex: Int
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/details/GradeDetailsFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/details/GradeDetailsFragment.kt
index 65cd9262..d50fd057 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/details/GradeDetailsFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/details/GradeDetailsFragment.kt
@@ -17,7 +17,7 @@ import eu.davidea.flexibleadapter.items.IExpandable
 import eu.davidea.flexibleadapter.items.IFlexible
 import io.github.wulkanowy.R
 import io.github.wulkanowy.data.db.entities.Grade
-import io.github.wulkanowy.ui.base.session.BaseSessionFragment
+import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.modules.grade.GradeFragment
 import io.github.wulkanowy.ui.modules.grade.GradeView
 import io.github.wulkanowy.ui.modules.main.MainActivity
@@ -25,7 +25,7 @@ import io.github.wulkanowy.utils.setOnItemClickListener
 import kotlinx.android.synthetic.main.fragment_grade_details.*
 import javax.inject.Inject
 
-class GradeDetailsFragment : BaseSessionFragment(), GradeDetailsView, GradeView.GradeChildView {
+class GradeDetailsFragment : BaseFragment(), GradeDetailsView, GradeView.GradeChildView {
 
     @Inject
     lateinit var presenter: GradeDetailsPresenter
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/details/GradeDetailsPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/details/GradeDetailsPresenter.kt
index 12e60687..29911a54 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/details/GradeDetailsPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/details/GradeDetailsPresenter.kt
@@ -6,8 +6,8 @@ import io.github.wulkanowy.data.repositories.grade.GradeRepository
 import io.github.wulkanowy.data.repositories.preferences.PreferencesRepository
 import io.github.wulkanowy.data.repositories.semester.SemesterRepository
 import io.github.wulkanowy.data.repositories.student.StudentRepository
-import io.github.wulkanowy.ui.base.session.BaseSessionPresenter
-import io.github.wulkanowy.ui.base.session.SessionErrorHandler
+import io.github.wulkanowy.ui.base.BasePresenter
+import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.ui.modules.grade.GradeAverageProvider
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
@@ -16,15 +16,15 @@ import timber.log.Timber
 import javax.inject.Inject
 
 class GradeDetailsPresenter @Inject constructor(
-    private val errorHandler: SessionErrorHandler,
-    private val schedulers: SchedulersProvider,
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val gradeRepository: GradeRepository,
-    private val studentRepository: StudentRepository,
     private val semesterRepository: SemesterRepository,
     private val preferencesRepository: PreferencesRepository,
     private val averageProvider: GradeAverageProvider,
     private val analytics: FirebaseAnalyticsHelper
-) : BaseSessionPresenter<GradeDetailsView>(errorHandler) {
+) : BasePresenter<GradeDetailsView>(errorHandler, studentRepository, schedulers) {
 
     private var currentSemesterId = 0
 
@@ -113,7 +113,7 @@ class GradeDetailsPresenter @Inject constructor(
             .flatMap { (student, semesters) ->
                 averageProvider.getGradeAverage(student, semesters, semesterId, forceRefresh)
                     .flatMap { averages ->
-                        gradeRepository.getGrades(student, semesters.first { semester -> semester.semesterId == semesterId })
+                        gradeRepository.getGrades(student, semesters.first { it.semesterId == semesterId }, forceRefresh)
                             .map { it.sortedByDescending { grade -> grade.date } }
                             .map { it.groupBy { grade -> grade.subject }.toSortedMap() }
                             .map { createGradeItems(it, averages) }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/details/GradeDetailsView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/details/GradeDetailsView.kt
index 1fb98216..88b83bda 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/details/GradeDetailsView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/details/GradeDetailsView.kt
@@ -4,9 +4,9 @@ import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import eu.davidea.flexibleadapter.items.IExpandable
 import eu.davidea.flexibleadapter.items.IFlexible
 import io.github.wulkanowy.data.db.entities.Grade
-import io.github.wulkanowy.ui.base.session.BaseSessionView
+import io.github.wulkanowy.ui.base.BaseView
 
-interface GradeDetailsView : BaseSessionView {
+interface GradeDetailsView : BaseView {
 
     val isViewEmpty: Boolean
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/statistics/GradeStatisticsFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/statistics/GradeStatisticsFragment.kt
index f27a13c8..a1cea6df 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/statistics/GradeStatisticsFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/statistics/GradeStatisticsFragment.kt
@@ -16,7 +16,7 @@ import com.github.mikephil.charting.data.PieEntry
 import com.github.mikephil.charting.formatter.ValueFormatter
 import io.github.wulkanowy.R
 import io.github.wulkanowy.data.db.entities.GradeStatistics
-import io.github.wulkanowy.ui.base.session.BaseSessionFragment
+import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.modules.grade.GradeFragment
 import io.github.wulkanowy.ui.modules.grade.GradeView
 import io.github.wulkanowy.utils.getThemeAttrColor
@@ -24,7 +24,7 @@ import io.github.wulkanowy.utils.setOnItemSelectedListener
 import kotlinx.android.synthetic.main.fragment_grade_statistics.*
 import javax.inject.Inject
 
-class GradeStatisticsFragment : BaseSessionFragment(), GradeStatisticsView, GradeView.GradeChildView {
+class GradeStatisticsFragment : BaseFragment(), GradeStatisticsView, GradeView.GradeChildView {
 
     @Inject
     lateinit var presenter: GradeStatisticsPresenter
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/statistics/GradeStatisticsPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/statistics/GradeStatisticsPresenter.kt
index 5dd485cd..55ea611f 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/statistics/GradeStatisticsPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/statistics/GradeStatisticsPresenter.kt
@@ -6,23 +6,23 @@ import io.github.wulkanowy.data.repositories.preferences.PreferencesRepository
 import io.github.wulkanowy.data.repositories.semester.SemesterRepository
 import io.github.wulkanowy.data.repositories.student.StudentRepository
 import io.github.wulkanowy.data.repositories.subject.SubjectRepository
-import io.github.wulkanowy.ui.base.session.BaseSessionPresenter
-import io.github.wulkanowy.ui.base.session.SessionErrorHandler
+import io.github.wulkanowy.ui.base.BasePresenter
+import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
 import timber.log.Timber
 import javax.inject.Inject
 
 class GradeStatisticsPresenter @Inject constructor(
-    private val errorHandler: SessionErrorHandler,
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val gradeStatisticsRepository: GradeStatisticsRepository,
     private val subjectRepository: SubjectRepository,
-    private val studentRepository: StudentRepository,
     private val semesterRepository: SemesterRepository,
     private val preferencesRepository: PreferencesRepository,
-    private val schedulers: SchedulersProvider,
     private val analytics: FirebaseAnalyticsHelper
-) : BaseSessionPresenter<GradeStatisticsView>(errorHandler) {
+) : BasePresenter<GradeStatisticsView>(errorHandler, studentRepository, schedulers) {
 
     private var subjects = emptyList<Subject>()
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/statistics/GradeStatisticsView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/statistics/GradeStatisticsView.kt
index dbdde459..edb2552e 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/statistics/GradeStatisticsView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/statistics/GradeStatisticsView.kt
@@ -1,9 +1,9 @@
 package io.github.wulkanowy.ui.modules.grade.statistics
 
 import io.github.wulkanowy.data.db.entities.GradeStatistics
-import io.github.wulkanowy.ui.base.session.BaseSessionView
+import io.github.wulkanowy.ui.base.BaseView
 
-interface GradeStatisticsView : BaseSessionView {
+interface GradeStatisticsView : BaseView {
 
     val isViewEmpty: Boolean
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryFragment.kt
index f174f96c..7699a641 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryFragment.kt
@@ -11,13 +11,13 @@ import eu.davidea.flexibleadapter.FlexibleAdapter
 import eu.davidea.flexibleadapter.common.SmoothScrollLinearLayoutManager
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.R
-import io.github.wulkanowy.ui.base.session.BaseSessionFragment
+import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.modules.grade.GradeFragment
 import io.github.wulkanowy.ui.modules.grade.GradeView
 import kotlinx.android.synthetic.main.fragment_grade_summary.*
 import javax.inject.Inject
 
-class GradeSummaryFragment : BaseSessionFragment(), GradeSummaryView, GradeView.GradeChildView {
+class GradeSummaryFragment : BaseFragment(), GradeSummaryView, GradeView.GradeChildView {
 
     @Inject
     lateinit var presenter: GradeSummaryPresenter
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryItem.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryItem.kt
index 5737a832..95c32d17 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryItem.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryItem.kt
@@ -1,19 +1,21 @@
 package io.github.wulkanowy.ui.modules.grade.summary
 
+import android.annotation.SuppressLint
 import android.view.View
+import android.view.View.GONE
+import android.view.View.VISIBLE
 import eu.davidea.flexibleadapter.FlexibleAdapter
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import eu.davidea.flexibleadapter.items.IFlexible
 import eu.davidea.viewholders.FlexibleViewHolder
 import io.github.wulkanowy.R
+import io.github.wulkanowy.data.db.entities.GradeSummary
 import kotlinx.android.extensions.LayoutContainer
 import kotlinx.android.synthetic.main.item_grade_summary.*
 
 class GradeSummaryItem(
-    private val title: String,
-    private val average: String,
-    private val predictedGrade: String,
-    private val finalGrade: String
+    val summary: GradeSummary,
+    private val average: String
 ) : AbstractFlexibleItem<GradeSummaryItem.ViewHolder>() {
 
     override fun getLayoutRes() = R.layout.item_grade_summary
@@ -22,12 +24,16 @@ class GradeSummaryItem(
         return ViewHolder(view, adapter)
     }
 
+    @SuppressLint("SetTextI18n")
     override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder, position: Int, payloads: MutableList<Any>?) {
         holder.run {
-            gradeSummaryItemTitle.text = title
+            gradeSummaryItemTitle.text = summary.subject
+            gradeSummaryItemPoints.text = summary.pointsSum
             gradeSummaryItemAverage.text = average
-            gradeSummaryItemPredicted.text = predictedGrade
-            gradeSummaryItemFinal.text = finalGrade
+            gradeSummaryItemPredicted.text = "${summary.predictedGrade} ${summary.proposedPoints}".trim()
+            gradeSummaryItemFinal.text = "${summary.finalGrade} ${summary.finalPoints}".trim()
+
+            gradeSummaryItemPointsContainer.visibility = if (summary.pointsSum.isBlank()) GONE else VISIBLE
         }
     }
 
@@ -38,18 +44,16 @@ class GradeSummaryItem(
         other as GradeSummaryItem
 
         if (average != other.average) return false
-        if (title != other.title) return false
-        if (predictedGrade != other.predictedGrade) return false
-        if (finalGrade != other.finalGrade) return false
+        if (summary != other.summary) return false
+        if (summary.id != other.summary.id) return false
 
         return true
     }
 
     override fun hashCode(): Int {
-        var result = title.hashCode()
+        var result = summary.hashCode()
+        result = 31 * result + summary.id.hashCode()
         result = 31 * result + average.hashCode()
-        result = 31 * result + predictedGrade.hashCode()
-        result = 31 * result + finalGrade.hashCode()
         return result
     }
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryPresenter.kt
index bab64632..3f8fd0ed 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryPresenter.kt
@@ -4,8 +4,8 @@ import io.github.wulkanowy.data.db.entities.GradeSummary
 import io.github.wulkanowy.data.repositories.gradessummary.GradeSummaryRepository
 import io.github.wulkanowy.data.repositories.semester.SemesterRepository
 import io.github.wulkanowy.data.repositories.student.StudentRepository
-import io.github.wulkanowy.ui.base.session.BaseSessionPresenter
-import io.github.wulkanowy.ui.base.session.SessionErrorHandler
+import io.github.wulkanowy.ui.base.BasePresenter
+import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.ui.modules.grade.GradeAverageProvider
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
@@ -16,14 +16,14 @@ import java.util.Locale.FRANCE
 import javax.inject.Inject
 
 class GradeSummaryPresenter @Inject constructor(
-    private val errorHandler: SessionErrorHandler,
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val gradeSummaryRepository: GradeSummaryRepository,
-    private val studentRepository: StudentRepository,
     private val semesterRepository: SemesterRepository,
     private val averageProvider: GradeAverageProvider,
-    private val schedulers: SchedulersProvider,
     private val analytics: FirebaseAnalyticsHelper
-) : BaseSessionPresenter<GradeSummaryView>(errorHandler) {
+) : BasePresenter<GradeSummaryView>(errorHandler, studentRepository, schedulers) {
 
     override fun onAttachView(view: GradeSummaryView) {
         super.onAttachView(view)
@@ -96,10 +96,8 @@ class GradeSummaryPresenter @Inject constructor(
                 gradesSummary.filter { !checkEmpty(it, filteredAverages) }
                     .map {
                         GradeSummaryItem(
-                            title = it.subject,
-                            average = formatAverage(filteredAverages.getOrElse(it.subject) { 0.0 }, ""),
-                            predictedGrade = it.predictedGrade,
-                            finalGrade = it.finalGrade
+                            summary = it,
+                            average = formatAverage(filteredAverages.getOrElse(it.subject) { 0.0 }, "")
                         )
                     }.let {
                         it to GradeSummaryScrollableHeader(
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryView.kt
index 5f7c7b16..9e9c6e58 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryView.kt
@@ -1,8 +1,8 @@
 package io.github.wulkanowy.ui.modules.grade.summary
 
-import io.github.wulkanowy.ui.base.session.BaseSessionView
+import io.github.wulkanowy.ui.base.BaseView
 
-interface GradeSummaryView : BaseSessionView {
+interface GradeSummaryView : BaseView {
 
     val isViewEmpty: Boolean
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/homework/HomeworkFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/homework/HomeworkFragment.kt
index 7325e3ec..01fdc909 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/homework/HomeworkFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/homework/HomeworkFragment.kt
@@ -10,14 +10,14 @@ import eu.davidea.flexibleadapter.common.SmoothScrollLinearLayoutManager
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.R
 import io.github.wulkanowy.data.db.entities.Homework
-import io.github.wulkanowy.ui.base.session.BaseSessionFragment
+import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.modules.main.MainActivity
 import io.github.wulkanowy.ui.modules.main.MainView
 import io.github.wulkanowy.utils.setOnItemClickListener
 import kotlinx.android.synthetic.main.fragment_homework.*
 import javax.inject.Inject
 
-class HomeworkFragment : BaseSessionFragment(), HomeworkView, MainView.TitledView {
+class HomeworkFragment : BaseFragment(), HomeworkView, MainView.TitledView {
 
     @Inject
     lateinit var presenter: HomeworkPresenter
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/homework/HomeworkPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/homework/HomeworkPresenter.kt
index de85d8d1..6829031c 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/homework/HomeworkPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/homework/HomeworkPresenter.kt
@@ -1,33 +1,36 @@
 package io.github.wulkanowy.ui.modules.homework
 
-import com.google.firebase.analytics.FirebaseAnalytics.Param.START_DATE
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.data.db.entities.Homework
 import io.github.wulkanowy.data.repositories.homework.HomeworkRepository
 import io.github.wulkanowy.data.repositories.semester.SemesterRepository
 import io.github.wulkanowy.data.repositories.student.StudentRepository
-import io.github.wulkanowy.ui.base.session.BaseSessionPresenter
-import io.github.wulkanowy.ui.base.session.SessionErrorHandler
+import io.github.wulkanowy.ui.base.BasePresenter
+import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
 import io.github.wulkanowy.utils.friday
+import io.github.wulkanowy.utils.getLastSchoolDayIfHoliday
 import io.github.wulkanowy.utils.isHolidays
 import io.github.wulkanowy.utils.monday
 import io.github.wulkanowy.utils.nextOrSameSchoolDay
 import io.github.wulkanowy.utils.toFormattedString
 import org.threeten.bp.LocalDate
+import org.threeten.bp.LocalDate.ofEpochDay
 import timber.log.Timber
 import java.util.concurrent.TimeUnit
 import javax.inject.Inject
 
 class HomeworkPresenter @Inject constructor(
-    private val errorHandler: SessionErrorHandler,
-    private val schedulers: SchedulersProvider,
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val homeworkRepository: HomeworkRepository,
-    private val studentRepository: StudentRepository,
     private val semesterRepository: SemesterRepository,
     private val analytics: FirebaseAnalyticsHelper
-) : BaseSessionPresenter<HomeworkView>(errorHandler) {
+) : BasePresenter<HomeworkView>(errorHandler, studentRepository, schedulers) {
+
+    private var baseDate: LocalDate = LocalDate.now().nextOrSameSchoolDay
 
     lateinit var currentDate: LocalDate
         private set
@@ -36,7 +39,8 @@ class HomeworkPresenter @Inject constructor(
         super.onAttachView(view)
         view.initView()
         Timber.i("Homework view was initialized")
-        loadData(LocalDate.ofEpochDay(date ?: LocalDate.now().nextOrSameSchoolDay.toEpochDay()))
+        loadData(ofEpochDay(date ?: baseDate.toEpochDay()))
+        if (currentDate.isHolidays) setBaseDateOnHolidays()
         reloadView()
     }
 
@@ -62,6 +66,20 @@ class HomeworkPresenter @Inject constructor(
         }
     }
 
+    private fun setBaseDateOnHolidays() {
+        disposable.add(studentRepository.getCurrentStudent()
+            .flatMap { semesterRepository.getCurrentSemester(it) }
+            .subscribeOn(schedulers.backgroundThread)
+            .observeOn(schedulers.mainThread)
+            .subscribe({
+                baseDate = baseDate.getLastSchoolDayIfHoliday(it.schoolYear)
+                currentDate = baseDate
+                reloadNavigation()
+            }) {
+                Timber.i("Loading semester result: An exception occurred")
+            })
+    }
+
     private fun loadData(date: LocalDate, forceRefresh: Boolean = false) {
         Timber.i("Loading homework data started")
         currentDate = date
@@ -89,7 +107,7 @@ class HomeworkPresenter @Inject constructor(
                         showEmpty(it.isEmpty())
                         showContent(it.isNotEmpty())
                     }
-                    analytics.logEvent("load_homework", "items" to it.size, "force_refresh" to forceRefresh, START_DATE to currentDate.toFormattedString("yyyy-MM-dd"))
+                    analytics.logEvent("load_homework", "items" to it.size, "force_refresh" to forceRefresh)
                 }) {
                     Timber.i("Loading homework result: An exception occurred")
                     view?.run { showEmpty(isViewEmpty()) }
@@ -114,8 +132,14 @@ class HomeworkPresenter @Inject constructor(
             showContent(false)
             showEmpty(false)
             clearData()
-            showNextButton(!currentDate.plusDays(7).isHolidays)
+            reloadNavigation()
+        }
+    }
+
+    private fun reloadNavigation() {
+        view?.apply {
             showPreButton(!currentDate.minusDays(7).isHolidays)
+            showNextButton(!currentDate.plusDays(7).isHolidays)
             updateNavigationWeek("${currentDate.monday.toFormattedString("dd.MM")} - " +
                 currentDate.friday.toFormattedString("dd.MM"))
         }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/homework/HomeworkView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/homework/HomeworkView.kt
index 546d0526..977a5b73 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/homework/HomeworkView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/homework/HomeworkView.kt
@@ -1,9 +1,9 @@
 package io.github.wulkanowy.ui.modules.homework
 
 import io.github.wulkanowy.data.db.entities.Homework
-import io.github.wulkanowy.ui.base.session.BaseSessionView
+import io.github.wulkanowy.ui.base.BaseView
 
-interface HomeworkView : BaseSessionView {
+interface HomeworkView : BaseView {
 
     fun initView()
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/login/LoginActivity.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/login/LoginActivity.kt
index da054bb5..5e707b8a 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/login/LoginActivity.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/login/LoginActivity.kt
@@ -14,10 +14,10 @@ import io.github.wulkanowy.utils.setOnSelectPageListener
 import kotlinx.android.synthetic.main.activity_login.*
 import javax.inject.Inject
 
-class LoginActivity : BaseActivity(), LoginView {
+class LoginActivity : BaseActivity<LoginPresenter>(), LoginView {
 
     @Inject
-    lateinit var presenter: LoginPresenter
+    override lateinit var presenter: LoginPresenter
 
     @Inject
     lateinit var loginAdapter: BaseFragmentPagerAdapter
@@ -81,9 +81,4 @@ class LoginActivity : BaseActivity(), LoginView {
     fun onSymbolFragmentAccountLogged(students: List<Student>) {
         presenter.onSymbolViewAccountLogged(students)
     }
-
-    public override fun onDestroy() {
-        presenter.onDetachView()
-        super.onDestroy()
-    }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/login/LoginPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/login/LoginPresenter.kt
index 00242a7d..87827152 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/login/LoginPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/login/LoginPresenter.kt
@@ -1,12 +1,18 @@
 package io.github.wulkanowy.ui.modules.login
 
 import io.github.wulkanowy.data.db.entities.Student
+import io.github.wulkanowy.data.repositories.student.StudentRepository
 import io.github.wulkanowy.ui.base.BasePresenter
 import io.github.wulkanowy.ui.base.ErrorHandler
+import io.github.wulkanowy.utils.SchedulersProvider
 import timber.log.Timber
 import javax.inject.Inject
 
-class LoginPresenter @Inject constructor(errorHandler: ErrorHandler) : BasePresenter<LoginView>(errorHandler) {
+class LoginPresenter @Inject constructor(
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository
+) : BasePresenter<LoginView>(errorHandler, studentRepository, schedulers) {
 
     override fun onAttachView(view: LoginView) {
         super.onAttachView(view)
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/login/form/LoginFormFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/login/form/LoginFormFragment.kt
index b17a1205..93db3679 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/login/form/LoginFormFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/login/form/LoginFormFragment.kt
@@ -10,11 +10,11 @@ import android.view.ViewGroup
 import android.view.inputmethod.EditorInfo.IME_ACTION_DONE
 import android.view.inputmethod.EditorInfo.IME_NULL
 import android.widget.ArrayAdapter
-import io.github.wulkanowy.BuildConfig.VERSION_NAME
 import io.github.wulkanowy.R
 import io.github.wulkanowy.data.db.entities.Student
 import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.modules.login.LoginActivity
+import io.github.wulkanowy.utils.AppInfo
 import io.github.wulkanowy.utils.hideSoftInput
 import io.github.wulkanowy.utils.openInternetBrowser
 import io.github.wulkanowy.utils.setOnItemSelectedListener
@@ -28,6 +28,9 @@ class LoginFormFragment : BaseFragment(), LoginFormView {
     @Inject
     lateinit var presenter: LoginFormPresenter
 
+    @Inject
+    lateinit var appInfo: AppInfo
+
     companion object {
         fun newInstance() = LoginFormFragment()
     }
@@ -128,7 +131,7 @@ class LoginFormFragment : BaseFragment(), LoginFormView {
     override fun showVersion() {
         loginFormVersion.apply {
             visibility = VISIBLE
-            text = "${getString(R.string.app_name)} $VERSION_NAME"
+            text = "${getString(R.string.app_name)} ${appInfo.versionName}"
         }
     }
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/login/form/LoginFormPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/login/form/LoginFormPresenter.kt
index 3ab47c29..540a91be 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/login/form/LoginFormPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/login/form/LoginFormPresenter.kt
@@ -1,30 +1,30 @@
 package io.github.wulkanowy.ui.modules.login.form
 
-import com.google.firebase.analytics.FirebaseAnalytics.Param.SUCCESS
 import io.github.wulkanowy.data.repositories.student.StudentRepository
 import io.github.wulkanowy.ui.base.BasePresenter
 import io.github.wulkanowy.ui.modules.login.LoginErrorHandler
+import io.github.wulkanowy.utils.AppInfo
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
+import io.github.wulkanowy.utils.ifNullOrBlank
 import timber.log.Timber
 import javax.inject.Inject
-import javax.inject.Named
 
 class LoginFormPresenter @Inject constructor(
-    private val schedulers: SchedulersProvider,
-    private val errorHandler: LoginErrorHandler,
-    private val studentRepository: StudentRepository,
+    schedulers: SchedulersProvider,
+    studentRepository: StudentRepository,
+    private val loginErrorHandler: LoginErrorHandler,
     private val analytics: FirebaseAnalyticsHelper,
-    @param:Named("isDebug") private val isDebug: Boolean
-) : BasePresenter<LoginFormView>(errorHandler) {
+    private val appInfo: AppInfo
+) : BasePresenter<LoginFormView>(loginErrorHandler, studentRepository, schedulers) {
 
     override fun onAttachView(view: LoginFormView) {
         super.onAttachView(view)
         view.run {
             initView()
-            if (isDebug) showVersion() else showPrivacyPolicy()
+            if (appInfo.isDebug) showVersion() else showPrivacyPolicy()
 
-            errorHandler.onBadCredentials = {
+            loginErrorHandler.onBadCredentials = {
                 setErrorPassIncorrect()
                 showSoftKeyboard()
                 Timber.i("Entered wrong username or password")
@@ -78,12 +78,12 @@ class LoginFormPresenter @Inject constructor(
             }
             .subscribe({
                 Timber.i("Login result: Success")
-                analytics.logEvent("registration_form", SUCCESS to true, "students" to it.size, "endpoint" to endpoint, "error" to "No error")
+                analytics.logEvent("registration_form", "success" to true, "students" to it.size, "endpoint" to endpoint, "error" to "No error")
                 view?.notifyParentAccountLogged(it)
             }, {
                 Timber.i("Login result: An exception occurred")
-                analytics.logEvent("registration_form", SUCCESS to false, "students" to -1, "endpoint" to endpoint, "error" to it.localizedMessage)
-                errorHandler.dispatch(it)
+                analytics.logEvent("registration_form", "success" to false, "students" to -1, "endpoint" to endpoint, "error" to it.message.ifNullOrBlank { "No message" })
+                loginErrorHandler.dispatch(it)
             }))
     }
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/login/studentselect/LoginStudentSelectPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/login/studentselect/LoginStudentSelectPresenter.kt
index 21dde7b8..e02227cb 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/login/studentselect/LoginStudentSelectPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/login/studentselect/LoginStudentSelectPresenter.kt
@@ -1,6 +1,5 @@
 package io.github.wulkanowy.ui.modules.login.studentselect
 
-import com.google.firebase.analytics.FirebaseAnalytics.Param.SUCCESS
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.data.db.entities.Student
 import io.github.wulkanowy.data.repositories.student.StudentRepository
@@ -8,27 +7,28 @@ import io.github.wulkanowy.ui.base.BasePresenter
 import io.github.wulkanowy.ui.modules.login.LoginErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
+import io.github.wulkanowy.utils.ifNullOrBlank
 import timber.log.Timber
 import java.io.Serializable
 import javax.inject.Inject
 
 class LoginStudentSelectPresenter @Inject constructor(
-    private val errorHandler: LoginErrorHandler,
-    private val studentRepository: StudentRepository,
-    private val schedulers: SchedulersProvider,
+    schedulers: SchedulersProvider,
+    studentRepository: StudentRepository,
+    private val loginErrorHandler: LoginErrorHandler,
     private val analytics: FirebaseAnalyticsHelper
-) : BasePresenter<LoginStudentSelectView>(errorHandler) {
+) : BasePresenter<LoginStudentSelectView>(loginErrorHandler, studentRepository, schedulers) {
 
     var students = emptyList<Student>()
 
-    var selectedStudents = mutableListOf<Student>()
+    private var selectedStudents = mutableListOf<Student>()
 
     fun onAttachView(view: LoginStudentSelectView, students: Serializable?) {
         super.onAttachView(view)
         view.run {
             initView()
             enableSignIn(false)
-            errorHandler.onStudentDuplicate = {
+            loginErrorHandler.onStudentDuplicate = {
                 showMessage(it)
                 Timber.i("The student already registered in the app was selected")
             }
@@ -78,13 +78,13 @@ class LoginStudentSelectPresenter @Inject constructor(
                 Timber.i("Registration started")
             }
             .subscribe({
-                students.forEach { analytics.logEvent("registration_student_select", SUCCESS to true, "endpoint" to it.endpoint, "symbol" to it.symbol, "error" to "No error") }
+                students.forEach { analytics.logEvent("registration_student_select", "success" to true, "endpoint" to it.endpoint, "symbol" to it.symbol, "error" to "No error") }
                 Timber.i("Registration result: Success")
                 view?.openMainView()
             }, { error ->
-                students.forEach { analytics.logEvent("registration_student_select", SUCCESS to false, "endpoint" to it.endpoint, "symbol" to it.symbol, "error" to error.localizedMessage) }
+                students.forEach { analytics.logEvent("registration_student_select", "success" to false, "endpoint" to it.endpoint, "symbol" to it.symbol, "error" to error.message.ifNullOrBlank { "No message" }) }
                 Timber.i("Registration result: An exception occurred ")
-                errorHandler.dispatch(error)
+                loginErrorHandler.dispatch(error)
                 view?.apply {
                     showProgress(false)
                     showContent(true)
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/login/symbol/LoginSymbolPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/login/symbol/LoginSymbolPresenter.kt
index 0adb9e16..5a7a3777 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/login/symbol/LoginSymbolPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/login/symbol/LoginSymbolPresenter.kt
@@ -1,22 +1,22 @@
 package io.github.wulkanowy.ui.modules.login.symbol
 
-import com.google.firebase.analytics.FirebaseAnalytics.Param.SUCCESS
 import io.github.wulkanowy.data.repositories.student.StudentRepository
 import io.github.wulkanowy.ui.base.BasePresenter
 import io.github.wulkanowy.ui.modules.login.LoginErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
+import io.github.wulkanowy.utils.ifNullOrBlank
 import io.reactivex.Single
 import timber.log.Timber
 import java.io.Serializable
 import javax.inject.Inject
 
 class LoginSymbolPresenter @Inject constructor(
-    private val studentRepository: StudentRepository,
-    private val errorHandler: LoginErrorHandler,
-    private val schedulers: SchedulersProvider,
+    studentRepository: StudentRepository,
+    schedulers: SchedulersProvider,
+    private val loginErrorHandler: LoginErrorHandler,
     private val analytics: FirebaseAnalyticsHelper
-) : BasePresenter<LoginSymbolView>(errorHandler) {
+) : BasePresenter<LoginSymbolView>(loginErrorHandler, studentRepository, schedulers) {
 
     var loginData: Triple<String, String, String>? = null
 
@@ -59,7 +59,7 @@ class LoginSymbolPresenter @Inject constructor(
                     }
                 }
                 .subscribe({
-                    analytics.logEvent("registration_symbol", SUCCESS to true, "students" to it.size, "endpoint" to loginData?.third, "symbol" to symbol, "error" to "No error")
+                    analytics.logEvent("registration_symbol", "success" to true, "students" to it.size, "endpoint" to loginData?.third, "symbol" to symbol, "error" to "No error")
                     view?.apply {
                         if (it.isEmpty()) {
                             Timber.i("Login with symbol result: Empty student list")
@@ -71,8 +71,8 @@ class LoginSymbolPresenter @Inject constructor(
                     }
                 }, {
                     Timber.i("Login with symbol result: An exception occurred")
-                    analytics.logEvent("registration_symbol", SUCCESS to false, "students" to -1, "endpoint" to loginData?.third, "symbol" to symbol, "error" to it.localizedMessage)
-                    errorHandler.dispatch(it)
+                    analytics.logEvent("registration_symbol", "success" to false, "students" to -1, "endpoint" to loginData?.third, "symbol" to symbol, "error" to it.message.ifNullOrBlank { "No message" })
+                    loginErrorHandler.dispatch(it)
                 }))
     }
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumber/LuckyNumberFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumber/LuckyNumberFragment.kt
index cff6175c..00204a87 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumber/LuckyNumberFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumber/LuckyNumberFragment.kt
@@ -6,12 +6,12 @@ import android.view.View
 import android.view.ViewGroup
 import io.github.wulkanowy.R
 import io.github.wulkanowy.data.db.entities.LuckyNumber
-import io.github.wulkanowy.ui.base.session.BaseSessionFragment
+import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.modules.main.MainView
 import kotlinx.android.synthetic.main.fragment_lucky_number.*
 import javax.inject.Inject
 
-class LuckyNumberFragment : BaseSessionFragment(), LuckyNumberView, MainView.TitledView {
+class LuckyNumberFragment : BaseFragment(), LuckyNumberView, MainView.TitledView {
 
     @Inject
     lateinit var presenter: LuckyNumberPresenter
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumber/LuckyNumberPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumber/LuckyNumberPresenter.kt
index 8ef638db..ee7260e6 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumber/LuckyNumberPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumber/LuckyNumberPresenter.kt
@@ -4,20 +4,20 @@ import io.github.wulkanowy.data.repositories.luckynumber.LuckyNumberRepository
 import io.github.wulkanowy.data.repositories.semester.SemesterRepository
 import io.github.wulkanowy.data.repositories.student.StudentRepository
 import io.github.wulkanowy.ui.base.BasePresenter
-import io.github.wulkanowy.ui.base.session.SessionErrorHandler
+import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
 import timber.log.Timber
 import javax.inject.Inject
 
 class LuckyNumberPresenter @Inject constructor(
-    private val errorHandler: SessionErrorHandler,
-    private val schedulers: SchedulersProvider,
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val luckyNumberRepository: LuckyNumberRepository,
-    private val studentRepository: StudentRepository,
     private val semesterRepository: SemesterRepository,
     private val analytics: FirebaseAnalyticsHelper
-) : BasePresenter<LuckyNumberView>(errorHandler) {
+) : BasePresenter<LuckyNumberView>(errorHandler, studentRepository, schedulers) {
 
     override fun onAttachView(view: LuckyNumberView) {
         super.onAttachView(view)
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumber/LuckyNumberView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumber/LuckyNumberView.kt
index 5c19142c..9ead2b1f 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumber/LuckyNumberView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumber/LuckyNumberView.kt
@@ -1,9 +1,9 @@
 package io.github.wulkanowy.ui.modules.luckynumber
 
 import io.github.wulkanowy.data.db.entities.LuckyNumber
-import io.github.wulkanowy.ui.base.session.BaseSessionView
+import io.github.wulkanowy.ui.base.BaseView
 
-interface LuckyNumberView : BaseSessionView {
+interface LuckyNumberView : BaseView {
 
     fun initView()
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetConfigureActivity.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetConfigureActivity.kt
index 7e3eeb56..3dd0e5df 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetConfigureActivity.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetConfigureActivity.kt
@@ -16,13 +16,14 @@ import io.github.wulkanowy.utils.setOnItemClickListener
 import kotlinx.android.synthetic.main.activity_widget_configure.*
 import javax.inject.Inject
 
-class LuckyNumberWidgetConfigureActivity : BaseActivity(), LuckyNumberWidgetConfigureView {
+class LuckyNumberWidgetConfigureActivity : BaseActivity<LuckyNumberWidgetConfigurePresenter>(),
+    LuckyNumberWidgetConfigureView {
 
     @Inject
     lateinit var configureAdapter: FlexibleAdapter<AbstractFlexibleItem<*>>
 
     @Inject
-    lateinit var presenter: LuckyNumberWidgetConfigurePresenter
+    override lateinit var presenter: LuckyNumberWidgetConfigurePresenter
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -69,9 +70,4 @@ class LuckyNumberWidgetConfigureActivity : BaseActivity(), LuckyNumberWidgetConf
     override fun openLoginView() {
         startActivity(LoginActivity.getStartIntent(this))
     }
-
-    override fun onDestroy() {
-        super.onDestroy()
-        presenter.onDetachView()
-    }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetConfigurePresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetConfigurePresenter.kt
index 4fd81e96..2ed0fa6f 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetConfigurePresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetConfigurePresenter.kt
@@ -11,11 +11,11 @@ import io.github.wulkanowy.utils.SchedulersProvider
 import javax.inject.Inject
 
 class LuckyNumberWidgetConfigurePresenter @Inject constructor(
-    private val errorHandler: ErrorHandler,
-    private val schedulers: SchedulersProvider,
-    private val studentRepository: StudentRepository,
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val sharedPref: SharedPrefHelper
-) : BasePresenter<LuckyNumberWidgetConfigureView>(errorHandler) {
+) : BasePresenter<LuckyNumberWidgetConfigureView>(errorHandler, studentRepository, schedulers) {
 
     private var appWidgetId: Int? = null
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetProvider.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetProvider.kt
index cbf3b63c..66141c91 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetProvider.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetProvider.kt
@@ -100,11 +100,12 @@ class LuckyNumberWidgetProvider : BroadcastReceiver() {
                             when {
                                 student != null -> Maybe.just(student)
                                 studentId != 0L -> {
-                                    studentRepository.getCurrentStudent(false)
-                                        .toMaybe()
+                                    studentRepository.isCurrentStudentSet()
+                                        .filter { true }
+                                        .flatMap { studentRepository.getCurrentStudent(false).toMaybe() }
                                         .doOnSuccess { sharedPref.putLong(getStudentWidgetKey(appWidgetId), it.id) }
                                 }
-                                else -> null
+                                else -> Maybe.empty()
                             }
                         }
                 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainActivity.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainActivity.kt
index 5ca41b71..779f0a49 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainActivity.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainActivity.kt
@@ -7,7 +7,6 @@ import android.content.Intent.FLAG_ACTIVITY_NEW_TASK
 import android.os.Bundle
 import android.view.Menu
 import android.view.MenuItem
-import androidx.appcompat.app.AlertDialog
 import androidx.core.content.ContextCompat
 import androidx.fragment.app.DialogFragment
 import androidx.fragment.app.Fragment
@@ -22,7 +21,6 @@ import io.github.wulkanowy.ui.modules.attendance.AttendanceFragment
 import io.github.wulkanowy.ui.modules.exam.ExamFragment
 import io.github.wulkanowy.ui.modules.grade.GradeFragment
 import io.github.wulkanowy.ui.modules.homework.HomeworkFragment
-import io.github.wulkanowy.ui.modules.login.LoginActivity
 import io.github.wulkanowy.ui.modules.luckynumber.LuckyNumberFragment
 import io.github.wulkanowy.ui.modules.message.MessageFragment
 import io.github.wulkanowy.ui.modules.more.MoreFragment
@@ -34,10 +32,10 @@ import io.github.wulkanowy.utils.setOnViewChangeListener
 import kotlinx.android.synthetic.main.activity_main.*
 import javax.inject.Inject
 
-class MainActivity : BaseActivity(), MainView {
+class MainActivity : BaseActivity<MainPresenter>(), MainView {
 
     @Inject
-    lateinit var presenter: MainPresenter
+    override lateinit var presenter: MainPresenter
 
     @Inject
     lateinit var navController: FragNavController
@@ -154,15 +152,6 @@ class MainActivity : BaseActivity(), MainView {
         navController.showDialogFragment(AccountDialog.newInstance())
     }
 
-    fun showExpiredDialog() {
-        AlertDialog.Builder(this)
-            .setTitle(R.string.main_session_expired)
-            .setMessage(R.string.main_session_relogin)
-            .setPositiveButton(R.string.main_log_in) { _, _ -> presenter.onLoginSelected() }
-            .setNegativeButton(android.R.string.cancel) { _, _ -> }
-            .show()
-    }
-
     override fun notifyMenuViewReselected() {
         (navController.currentStack?.getOrNull(0) as? MainView.MainChildView)?.onFragmentReselected()
     }
@@ -183,19 +172,9 @@ class MainActivity : BaseActivity(), MainView {
         presenter.onBackPressed { super.onBackPressed() }
     }
 
-    override fun openLoginView() {
-        startActivity(LoginActivity.getStartIntent(this)
-            .apply { addFlags(FLAG_ACTIVITY_CLEAR_TASK or FLAG_ACTIVITY_NEW_TASK) })
-    }
-
     override fun onSaveInstanceState(outState: Bundle) {
         super.onSaveInstanceState(outState)
         navController.onSaveInstanceState(outState)
         intent.removeExtra(EXTRA_START_MENU)
     }
-
-    override fun onDestroy() {
-        super.onDestroy()
-        presenter.onDetachView()
-    }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainModule.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainModule.kt
index de4405b7..cc69005e 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainModule.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainModule.kt
@@ -19,6 +19,9 @@ import io.github.wulkanowy.ui.modules.luckynumber.LuckyNumberFragment
 import io.github.wulkanowy.ui.modules.message.MessageFragment
 import io.github.wulkanowy.ui.modules.message.MessageModule
 import io.github.wulkanowy.ui.modules.message.preview.MessagePreviewFragment
+import io.github.wulkanowy.ui.modules.mobiledevice.token.MobileDeviceTokenDialog
+import io.github.wulkanowy.ui.modules.mobiledevice.MobileDeviceFragment
+import io.github.wulkanowy.ui.modules.mobiledevice.MobileDeviceModule
 import io.github.wulkanowy.ui.modules.more.MoreFragment
 import io.github.wulkanowy.ui.modules.note.NoteFragment
 import io.github.wulkanowy.ui.modules.settings.SettingsFragment
@@ -97,4 +100,12 @@ abstract class MainModule {
     @PerFragment
     @ContributesAndroidInjector
     abstract fun bindAccountDialog(): AccountDialog
+
+    @PerFragment
+    @ContributesAndroidInjector(modules = [MobileDeviceModule::class])
+    abstract fun bindMobileDevices(): MobileDeviceFragment
+
+    @PerFragment
+    @ContributesAndroidInjector
+    abstract fun bindMobileDeviceDialog(): MobileDeviceTokenDialog
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainPresenter.kt
index 12f2bb04..a74226bf 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainPresenter.kt
@@ -1,7 +1,5 @@
 package io.github.wulkanowy.ui.modules.main
 
-import com.google.firebase.analytics.FirebaseAnalytics.Event.APP_OPEN
-import com.google.firebase.analytics.FirebaseAnalytics.Param.DESTINATION
 import io.github.wulkanowy.data.repositories.preferences.PreferencesRepository
 import io.github.wulkanowy.data.repositories.student.StudentRepository
 import io.github.wulkanowy.services.sync.SyncManager
@@ -9,18 +7,17 @@ import io.github.wulkanowy.ui.base.BasePresenter
 import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
-import io.reactivex.Completable
 import timber.log.Timber
 import javax.inject.Inject
 
 class MainPresenter @Inject constructor(
-    private val errorHandler: ErrorHandler,
-    private val studentRepository: StudentRepository,
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val prefRepository: PreferencesRepository,
     private val syncManager: SyncManager,
-    private val schedulers: SchedulersProvider,
     private val analytics: FirebaseAnalyticsHelper
-) : BasePresenter<MainView>(errorHandler) {
+) : BasePresenter<MainView>(errorHandler, studentRepository, schedulers) {
 
     fun onAttachView(view: MainView, initMenu: MainView.MenuView?) {
         super.onAttachView(view)
@@ -34,7 +31,7 @@ class MainPresenter @Inject constructor(
         }
 
         syncManager.startSyncWorker()
-        analytics.logEvent(APP_OPEN, DESTINATION to initMenu?.name)
+        analytics.logEvent("app_open", "destination" to initMenu?.name)
     }
 
     fun onViewChange() {
@@ -80,28 +77,6 @@ class MainPresenter @Inject constructor(
         } == true
     }
 
-    fun onLoginSelected() {
-        Timber.i("Attempt to switch the student after the session expires")
-        disposable.add(studentRepository.getCurrentStudent(false)
-            .flatMapCompletable { studentRepository.logoutStudent(it) }
-            .andThen(studentRepository.getSavedStudents(false))
-            .flatMapCompletable {
-                if (it.isNotEmpty()) {
-                    Timber.i("Switching current student")
-                    studentRepository.switchStudent(it[0])
-                } else Completable.complete()
-            }
-            .subscribeOn(schedulers.backgroundThread)
-            .observeOn(schedulers.mainThread)
-            .subscribe({
-                Timber.i("Switch student result: Open login view")
-                view?.openLoginView()
-            }, {
-                Timber.i("Switch student result: An exception occurred")
-                errorHandler.dispatch(it)
-            }))
-    }
-
     private fun getProperViewIndexes(initMenu: MainView.MenuView?): Pair<Int, Int> {
         return when {
             initMenu?.id in 0..3 -> initMenu!!.id to -1
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainView.kt
index a786a3c3..6aef573e 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainView.kt
@@ -28,8 +28,6 @@ interface MainView : BaseView {
 
     fun popView()
 
-    fun openLoginView()
-
     interface MainChildView {
 
         fun onFragmentReselected()
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/message/MessagePresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/message/MessagePresenter.kt
index 888df040..0f5598b2 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/message/MessagePresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/message/MessagePresenter.kt
@@ -1,6 +1,7 @@
 package io.github.wulkanowy.ui.modules.message
 
 import io.github.wulkanowy.data.db.entities.Message
+import io.github.wulkanowy.data.repositories.student.StudentRepository
 import io.github.wulkanowy.ui.base.BasePresenter
 import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.utils.SchedulersProvider
@@ -10,9 +11,10 @@ import java.util.concurrent.TimeUnit.MILLISECONDS
 import javax.inject.Inject
 
 class MessagePresenter @Inject constructor(
+    schedulers: SchedulersProvider,
     errorHandler: ErrorHandler,
-    private val schedulers: SchedulersProvider
-) : BasePresenter<MessageView>(errorHandler) {
+    studentRepository: StudentRepository
+) : BasePresenter<MessageView>(errorHandler, studentRepository, schedulers) {
 
     override fun onAttachView(view: MessageView) {
         super.onAttachView(view)
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/message/preview/MessagePreviewFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/message/preview/MessagePreviewFragment.kt
index 12765546..93ef502f 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/message/preview/MessagePreviewFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/message/preview/MessagePreviewFragment.kt
@@ -12,7 +12,7 @@ import android.view.View.VISIBLE
 import android.view.ViewGroup
 import io.github.wulkanowy.R
 import io.github.wulkanowy.data.db.entities.Message
-import io.github.wulkanowy.ui.base.session.BaseSessionFragment
+import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.modules.main.MainActivity
 import io.github.wulkanowy.ui.modules.main.MainView
 import io.github.wulkanowy.ui.modules.message.MessageFragment
@@ -20,14 +20,15 @@ import io.github.wulkanowy.ui.modules.message.send.SendMessageActivity
 import kotlinx.android.synthetic.main.fragment_message_preview.*
 import javax.inject.Inject
 
-@SuppressLint("SetTextI18n")
-class MessagePreviewFragment : BaseSessionFragment(), MessagePreviewView, MainView.TitledView {
+class MessagePreviewFragment : BaseFragment(), MessagePreviewView, MainView.TitledView {
 
     @Inject
     lateinit var presenter: MessagePreviewPresenter
 
     private var menuReplyButton: MenuItem? = null
+
     private var menuForwardButton: MenuItem? = null
+
     private var menuDeleteButton: MenuItem? = null
 
     override val titleStringId: Int
@@ -42,9 +43,9 @@ class MessagePreviewFragment : BaseSessionFragment(), MessagePreviewView, MainVi
     companion object {
         const val MESSAGE_ID_KEY = "message_id"
 
-        fun newInstance(messageId: Int?): MessagePreviewFragment {
+        fun newInstance(messageId: Long): MessagePreviewFragment {
             return MessagePreviewFragment().apply {
-                arguments = Bundle().apply { putInt(MESSAGE_ID_KEY, messageId ?: 0) }
+                arguments = Bundle().apply { putLong(MESSAGE_ID_KEY, messageId) }
             }
         }
     }
@@ -61,7 +62,7 @@ class MessagePreviewFragment : BaseSessionFragment(), MessagePreviewView, MainVi
     override fun onActivityCreated(savedInstanceState: Bundle?) {
         super.onActivityCreated(savedInstanceState)
         messageContainer = messagePreviewContainer
-        presenter.onAttachView(this, (savedInstanceState ?: arguments)?.getInt(MESSAGE_ID_KEY) ?: 0)
+        presenter.onAttachView(this, (savedInstanceState ?: arguments)?.getLong(MESSAGE_ID_KEY) ?: 0L)
     }
 
     override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
@@ -85,10 +86,12 @@ class MessagePreviewFragment : BaseSessionFragment(), MessagePreviewView, MainVi
         messagePreviewSubject.text = subject
     }
 
+    @SuppressLint("SetTextI18n")
     override fun setRecipient(recipient: String) {
         messagePreviewAuthor.text = "${getString(R.string.message_to)} $recipient"
     }
 
+    @SuppressLint("SetTextI18n")
     override fun setSender(sender: String) {
         messagePreviewAuthor.text = "${getString(R.string.message_from)} $sender"
     }
@@ -145,7 +148,7 @@ class MessagePreviewFragment : BaseSessionFragment(), MessagePreviewView, MainVi
 
     override fun onSaveInstanceState(outState: Bundle) {
         super.onSaveInstanceState(outState)
-        outState.putInt(MESSAGE_ID_KEY, presenter.messageId)
+        outState.putLong(MESSAGE_ID_KEY, presenter.messageId)
     }
 
     override fun onDestroyView() {
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/message/preview/MessagePreviewPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/message/preview/MessagePreviewPresenter.kt
index 397e103b..a230c0b3 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/message/preview/MessagePreviewPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/message/preview/MessagePreviewPresenter.kt
@@ -1,11 +1,10 @@
 package io.github.wulkanowy.ui.modules.message.preview
 
-import com.google.firebase.analytics.FirebaseAnalytics.Param.START_DATE
 import io.github.wulkanowy.data.db.entities.Message
 import io.github.wulkanowy.data.repositories.message.MessageRepository
 import io.github.wulkanowy.data.repositories.student.StudentRepository
-import io.github.wulkanowy.ui.base.session.BaseSessionPresenter
-import io.github.wulkanowy.ui.base.session.SessionErrorHandler
+import io.github.wulkanowy.ui.base.BasePresenter
+import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
 import io.github.wulkanowy.utils.toFormattedString
@@ -13,23 +12,23 @@ import timber.log.Timber
 import javax.inject.Inject
 
 class MessagePreviewPresenter @Inject constructor(
-    private val errorHandler: SessionErrorHandler,
-    private val schedulers: SchedulersProvider,
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val messageRepository: MessageRepository,
-    private val studentRepository: StudentRepository,
     private val analytics: FirebaseAnalyticsHelper
-) : BaseSessionPresenter<MessagePreviewView>(errorHandler) {
+) : BasePresenter<MessagePreviewView>(errorHandler, studentRepository, schedulers) {
 
-    var messageId: Int = 0
+    var messageId = 0L
 
     private var message: Message? = null
 
-    fun onAttachView(view: MessagePreviewView, id: Int) {
+    fun onAttachView(view: MessagePreviewView, id: Long) {
         super.onAttachView(view)
         loadData(id)
     }
 
-    private fun loadData(id: Int) {
+    private fun loadData(id: Long) {
         Timber.i("Loading message $id preview started")
         messageId = id
         disposable.apply {
@@ -53,7 +52,7 @@ class MessagePreviewPresenter @Inject constructor(
                             else setSender(it.sender)
                         }
                     }
-                    analytics.logEvent("load_message_preview", START_DATE to message.date.toFormattedString("yyyy.MM.dd"), "length" to message.content?.length)
+                    analytics.logEvent("load_message_preview", "length" to message.content?.length)
                 }) {
                     Timber.i("Loading message $id preview result: An exception occurred ")
                     view?.showMessageError()
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/message/preview/MessagePreviewView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/message/preview/MessagePreviewView.kt
index 8bc528a3..373dee11 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/message/preview/MessagePreviewView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/message/preview/MessagePreviewView.kt
@@ -1,9 +1,9 @@
 package io.github.wulkanowy.ui.modules.message.preview
 
 import io.github.wulkanowy.data.db.entities.Message
-import io.github.wulkanowy.ui.base.session.BaseSessionView
+import io.github.wulkanowy.ui.base.BaseView
 
-interface MessagePreviewView : BaseSessionView {
+interface MessagePreviewView : BaseView {
 
     val noSubjectString: String
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/message/send/SendMessageActivity.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/message/send/SendMessageActivity.kt
index 3a44ea86..5c6e74b0 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/message/send/SendMessageActivity.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/message/send/SendMessageActivity.kt
@@ -19,13 +19,14 @@ import io.github.wulkanowy.utils.showSoftInput
 import kotlinx.android.synthetic.main.activity_send_message.*
 import javax.inject.Inject
 
-class SendMessageActivity : BaseActivity(), SendMessageView {
+class SendMessageActivity : BaseActivity<SendMessagePresenter>(), SendMessageView {
 
     @Inject
-    lateinit var presenter: SendMessagePresenter
+    override lateinit var presenter: SendMessagePresenter
 
     companion object {
         private const val EXTRA_MESSAGE = "EXTRA_MESSAGE"
+
         private const val EXTRA_REPLY = "EXTRA_REPLY"
 
         fun getStartIntent(context: Context) = Intent(context, SendMessageActivity::class.java)
@@ -126,9 +127,4 @@ class SendMessageActivity : BaseActivity(), SendMessageView {
     override fun popView() {
         onBackPressed()
     }
-
-    override fun onDestroy() {
-        presenter.onDetachView()
-        super.onDestroy()
-    }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/message/send/SendMessagePresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/message/send/SendMessagePresenter.kt
index 8dedaba0..4808fafc 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/message/send/SendMessagePresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/message/send/SendMessagePresenter.kt
@@ -19,16 +19,16 @@ import timber.log.Timber
 import javax.inject.Inject
 
 class SendMessagePresenter @Inject constructor(
-    private val errorHandler: ErrorHandler,
-    private val schedulers: SchedulersProvider,
-    private val studentRepository: StudentRepository,
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val semesterRepository: SemesterRepository,
     private val messageRepository: MessageRepository,
     private val reportingUnitRepository: ReportingUnitRepository,
     private val recipientRepository: RecipientRepository,
     private val preferencesRepository: PreferencesRepository,
     private val analytics: FirebaseAnalyticsHelper
-) : BasePresenter<SendMessageView>(errorHandler) {
+) : BasePresenter<SendMessageView>(errorHandler, studentRepository, schedulers) {
 
     fun onAttachView(view: SendMessageView, message: Message?, reply: Boolean?) {
         super.onAttachView(view)
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/message/tab/MessageTabFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/message/tab/MessageTabFragment.kt
index e9d77e59..326cd6a7 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/message/tab/MessageTabFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/message/tab/MessageTabFragment.kt
@@ -13,7 +13,7 @@ import eu.davidea.flexibleadapter.common.SmoothScrollLinearLayoutManager
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.R
 import io.github.wulkanowy.data.repositories.message.MessageFolder
-import io.github.wulkanowy.ui.base.session.BaseSessionFragment
+import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.modules.main.MainActivity
 import io.github.wulkanowy.ui.modules.message.MessageFragment
 import io.github.wulkanowy.ui.modules.message.MessageItem
@@ -22,7 +22,7 @@ import io.github.wulkanowy.utils.setOnItemClickListener
 import kotlinx.android.synthetic.main.fragment_message_tab.*
 import javax.inject.Inject
 
-class MessageTabFragment : BaseSessionFragment(), MessageTabView {
+class MessageTabFragment : BaseFragment(), MessageTabView {
 
     @Inject
     lateinit var presenter: MessageTabPresenter
@@ -56,7 +56,7 @@ class MessageTabFragment : BaseSessionFragment(), MessageTabView {
         super.onActivityCreated(savedInstanceState)
         messageContainer = messageTabRecycler
         presenter.onAttachView(this, MessageFolder.valueOf(
-            (savedInstanceState ?: arguments)?.getString(MessageTabFragment.MESSAGE_TAB_FOLDER_ID).orEmpty()
+            (savedInstanceState ?: arguments)?.getString(MESSAGE_TAB_FOLDER_ID).orEmpty()
         ))
     }
 
@@ -106,7 +106,7 @@ class MessageTabFragment : BaseSessionFragment(), MessageTabView {
         messageTabSwipe.isRefreshing = show
     }
 
-    override fun openMessage(messageId: Int?) {
+    override fun openMessage(messageId: Long) {
         (activity as? MainActivity)?.pushView(MessagePreviewFragment.newInstance(messageId))
     }
 
@@ -124,7 +124,7 @@ class MessageTabFragment : BaseSessionFragment(), MessageTabView {
 
     override fun onSaveInstanceState(outState: Bundle) {
         super.onSaveInstanceState(outState)
-        outState.putString(MessageTabFragment.MESSAGE_TAB_FOLDER_ID, presenter.folder.name)
+        outState.putString(MESSAGE_TAB_FOLDER_ID, presenter.folder.name)
     }
 
     override fun onDestroyView() {
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/message/tab/MessageTabPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/message/tab/MessageTabPresenter.kt
index 4a8415e8..af576293 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/message/tab/MessageTabPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/message/tab/MessageTabPresenter.kt
@@ -5,8 +5,8 @@ import io.github.wulkanowy.data.db.entities.Message
 import io.github.wulkanowy.data.repositories.message.MessageFolder
 import io.github.wulkanowy.data.repositories.message.MessageRepository
 import io.github.wulkanowy.data.repositories.student.StudentRepository
-import io.github.wulkanowy.ui.base.session.BaseSessionPresenter
-import io.github.wulkanowy.ui.base.session.SessionErrorHandler
+import io.github.wulkanowy.ui.base.BasePresenter
+import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.ui.modules.message.MessageItem
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
@@ -14,12 +14,12 @@ import timber.log.Timber
 import javax.inject.Inject
 
 class MessageTabPresenter @Inject constructor(
-    private val errorHandler: SessionErrorHandler,
-    private val schedulers: SchedulersProvider,
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val messageRepository: MessageRepository,
-    private val studentRepository: StudentRepository,
     private val analytics: FirebaseAnalyticsHelper
-) : BaseSessionPresenter<MessageTabView>(errorHandler) {
+) : BasePresenter<MessageTabView>(errorHandler, studentRepository, schedulers) {
 
     lateinit var folder: MessageFolder
 
@@ -44,9 +44,9 @@ class MessageTabPresenter @Inject constructor(
 
     fun onMessageItemSelected(item: AbstractFlexibleItem<*>) {
         if (item is MessageItem) {
-            Timber.i("Select message ${item.message.realId} item")
+            Timber.i("Select message ${item.message.id} item")
             view?.run {
-                openMessage(item.message.realId)
+                openMessage(item.message.id)
                 if (item.message.unread) {
                     item.message.unread = false
                     updateItem(item)
@@ -90,13 +90,13 @@ class MessageTabPresenter @Inject constructor(
     }
 
     private fun updateMessage(message: Message) {
-        Timber.i("Attempt to update message ${message.realId}")
+        Timber.i("Attempt to update message ${message.id}")
         disposable.add(messageRepository.updateMessage(message)
             .subscribeOn(schedulers.backgroundThread)
             .observeOn(schedulers.mainThread)
-            .subscribe({ Timber.d("Update message ${message.realId} result: Success") })
+            .subscribe({ Timber.d("Update message ${message.id} result: Success") })
             { error ->
-                Timber.i("Update message ${message.realId} result: An exception occurred")
+                Timber.i("Update message ${message.id} result: An exception occurred")
                 errorHandler.dispatch(error)
             })
     }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/message/tab/MessageTabView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/message/tab/MessageTabView.kt
index bcda52b5..967863de 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/message/tab/MessageTabView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/message/tab/MessageTabView.kt
@@ -1,10 +1,10 @@
 package io.github.wulkanowy.ui.modules.message.tab
 
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
-import io.github.wulkanowy.ui.base.session.BaseSessionView
+import io.github.wulkanowy.ui.base.BaseView
 import io.github.wulkanowy.ui.modules.message.MessageItem
 
-interface MessageTabView : BaseSessionView {
+interface MessageTabView : BaseView {
 
     val noSubjectString: String
 
@@ -28,7 +28,7 @@ interface MessageTabView : BaseSessionView {
 
     fun showRefresh(show: Boolean)
 
-    fun openMessage(messageId: Int?)
+    fun openMessage(messageId: Long)
 
     fun notifyParentDataLoaded()
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDeviceAdapter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDeviceAdapter.kt
new file mode 100644
index 00000000..27c72ce6
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDeviceAdapter.kt
@@ -0,0 +1,10 @@
+package io.github.wulkanowy.ui.modules.mobiledevice
+
+import eu.davidea.flexibleadapter.FlexibleAdapter
+import eu.davidea.flexibleadapter.items.IFlexible
+import io.github.wulkanowy.data.db.entities.MobileDevice
+
+class MobileDeviceAdapter<T : IFlexible<*>> : FlexibleAdapter<T>(null, null, true) {
+
+    var onDeviceUnregisterListener: (device: MobileDevice, position: Int) -> Unit = { _, _ -> }
+}
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDeviceFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDeviceFragment.kt
new file mode 100644
index 00000000..1d9104a8
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDeviceFragment.kt
@@ -0,0 +1,124 @@
+package io.github.wulkanowy.ui.modules.mobiledevice
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.View.GONE
+import android.view.View.VISIBLE
+import android.view.ViewGroup
+import eu.davidea.flexibleadapter.common.FlexibleItemDecoration
+import eu.davidea.flexibleadapter.common.SmoothScrollLinearLayoutManager
+import eu.davidea.flexibleadapter.helpers.UndoHelper
+import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
+import io.github.wulkanowy.R
+import io.github.wulkanowy.data.db.entities.MobileDevice
+import io.github.wulkanowy.ui.base.BaseFragment
+import io.github.wulkanowy.ui.modules.main.MainActivity
+import io.github.wulkanowy.ui.modules.main.MainView
+import io.github.wulkanowy.ui.modules.mobiledevice.token.MobileDeviceTokenDialog
+import kotlinx.android.synthetic.main.fragment_mobile_device.*
+import javax.inject.Inject
+
+class MobileDeviceFragment : BaseFragment(), MobileDeviceView, MainView.TitledView {
+
+    @Inject
+    lateinit var presenter: MobileDevicePresenter
+
+    @Inject
+    lateinit var devicesAdapter: MobileDeviceAdapter<AbstractFlexibleItem<*>>
+
+    companion object {
+        fun newInstance() = MobileDeviceFragment()
+    }
+
+    override val titleStringId: Int
+        get() = R.string.mobile_devices_title
+
+    override val isViewEmpty: Boolean
+        get() = devicesAdapter.isEmpty
+
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        return inflater.inflate(R.layout.fragment_mobile_device, container, false)
+    }
+
+    override fun onActivityCreated(savedInstanceState: Bundle?) {
+        super.onActivityCreated(savedInstanceState)
+        messageContainer = mobileDevicesRecycler
+        presenter.onAttachView(this)
+    }
+
+    override fun initView() {
+        with(mobileDevicesRecycler) {
+            layoutManager = SmoothScrollLinearLayoutManager(context)
+            adapter = devicesAdapter
+            addItemDecoration(FlexibleItemDecoration(context)
+                .withDefaultDivider()
+                .withDrawDividerOnLastItem(false)
+            )
+        }
+        with(devicesAdapter) {
+            isPermanentDelete = false
+            onDeviceUnregisterListener = presenter::onUnregisterDevice
+        }
+        mobileDevicesSwipe.setOnRefreshListener { presenter.onSwipeRefresh() }
+        mobileDeviceAddButton.setOnClickListener { presenter.onRegisterDevice() }
+    }
+
+    override fun updateData(data: List<MobileDeviceItem>) {
+        devicesAdapter.updateDataSet(data)
+    }
+
+    override fun restoreDeleteItem() {
+        devicesAdapter.restoreDeletedItems()
+    }
+
+    override fun clearData() {
+        devicesAdapter.clear()
+    }
+
+    override fun showUndo(position: Int, device: MobileDevice) {
+        val onActionListener = object : UndoHelper.OnActionListener {
+            override fun onActionConfirmed(action: Int, event: Int) {
+                presenter.onUnregisterConfirmed(device)
+            }
+
+            override fun onActionCanceled(action: Int, positions: MutableList<Int>?) {
+                presenter.onUnregisterCancelled()
+            }
+        }
+
+        UndoHelper(devicesAdapter, onActionListener)
+            .withConsecutive(false)
+            .withAction(UndoHelper.Action.REMOVE)
+            .start(listOf(position), mobileDevicesRecycler, R.string.mobile_device_removed, R.string.all_undo, 3000)
+    }
+
+    override fun hideRefresh() {
+        mobileDevicesSwipe.isRefreshing = false
+    }
+
+    override fun showProgress(show: Boolean) {
+        mobileDevicesProgress.visibility = if (show) VISIBLE else GONE
+    }
+
+    override fun showEmpty(show: Boolean) {
+        mobileDevicesEmpty.visibility = if (show) VISIBLE else GONE
+    }
+
+    override fun enableSwipe(enable: Boolean) {
+        mobileDevicesSwipe.isEnabled = enable
+    }
+
+    override fun showContent(show: Boolean) {
+        mobileDevicesRecycler.visibility = if (show) VISIBLE else GONE
+    }
+
+    override fun showTokenDialog() {
+        (activity as? MainActivity)?.showDialogFragment(MobileDeviceTokenDialog.newInstance())
+    }
+
+    override fun onDestroyView() {
+        presenter.onDetachView()
+        super.onDestroyView()
+    }
+}
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDeviceItem.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDeviceItem.kt
new file mode 100644
index 00000000..436c2d0e
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDeviceItem.kt
@@ -0,0 +1,53 @@
+package io.github.wulkanowy.ui.modules.mobiledevice
+
+import android.view.View
+import eu.davidea.flexibleadapter.FlexibleAdapter
+import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
+import eu.davidea.flexibleadapter.items.IFlexible
+import eu.davidea.viewholders.FlexibleViewHolder
+import io.github.wulkanowy.R
+import io.github.wulkanowy.data.db.entities.MobileDevice
+import io.github.wulkanowy.utils.toFormattedString
+import kotlinx.android.extensions.LayoutContainer
+import kotlinx.android.synthetic.main.item_mobile_device.*
+
+class MobileDeviceItem(val device: MobileDevice) : AbstractFlexibleItem<MobileDeviceItem.ViewHolder>() {
+
+    override fun getLayoutRes() = R.layout.item_mobile_device
+
+    override fun createViewHolder(view: View, adapter: FlexibleAdapter<IFlexible<*>>): ViewHolder {
+        return ViewHolder(view, adapter)
+    }
+
+    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder, position: Int, payloads: MutableList<Any>?) {
+        holder.apply {
+            mobileDeviceItemDate.text = device.date.toFormattedString("dd.MM.yyyy HH:mm:ss")
+            mobileDeviceItemName.text = device.name
+            mobileDeviceItemUnregister.setOnClickListener {
+                (adapter as MobileDeviceAdapter).onDeviceUnregisterListener(device, holder.flexibleAdapterPosition)
+            }
+        }
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as MobileDeviceItem
+
+        if (device.id != other.device.id) return false
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = device.hashCode()
+        result = 31 * result + device.id.toInt()
+        return result
+    }
+
+    class ViewHolder(val view: View, adapter: FlexibleAdapter<*>) : FlexibleViewHolder(view, adapter), LayoutContainer {
+
+        override val containerView: View
+            get() = contentView
+    }
+}
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDeviceModule.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDeviceModule.kt
new file mode 100644
index 00000000..59bbaa9f
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDeviceModule.kt
@@ -0,0 +1,12 @@
+package io.github.wulkanowy.ui.modules.mobiledevice
+
+import dagger.Module
+import dagger.Provides
+import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
+
+@Module
+class MobileDeviceModule {
+
+    @Provides
+    fun provideMobileDeviceFlexibleAdapter() = MobileDeviceAdapter<AbstractFlexibleItem<*>>()
+}
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDevicePresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDevicePresenter.kt
new file mode 100644
index 00000000..71359a52
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDevicePresenter.kt
@@ -0,0 +1,110 @@
+package io.github.wulkanowy.ui.modules.mobiledevice
+
+import io.github.wulkanowy.data.db.entities.MobileDevice
+import io.github.wulkanowy.data.repositories.mobiledevice.MobileDeviceRepository
+import io.github.wulkanowy.data.repositories.semester.SemesterRepository
+import io.github.wulkanowy.data.repositories.student.StudentRepository
+import io.github.wulkanowy.ui.base.BasePresenter
+import io.github.wulkanowy.ui.base.ErrorHandler
+import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
+import io.github.wulkanowy.utils.SchedulersProvider
+import timber.log.Timber
+import javax.inject.Inject
+
+class MobileDevicePresenter @Inject constructor(
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
+    private val semesterRepository: SemesterRepository,
+    private val mobileDeviceRepository: MobileDeviceRepository,
+    private val analytics: FirebaseAnalyticsHelper
+) : BasePresenter<MobileDeviceView>(errorHandler, studentRepository, schedulers) {
+
+    override fun onAttachView(view: MobileDeviceView) {
+        super.onAttachView(view)
+        view.initView()
+        Timber.i("Mobile device view was initialized")
+        loadData()
+    }
+
+    fun onSwipeRefresh() {
+        loadData(true)
+    }
+
+    private fun loadData(forceRefresh: Boolean = false) {
+        Timber.i("Loading mobile devices data started")
+        disposable.add(studentRepository.getCurrentStudent()
+            .flatMap { semesterRepository.getCurrentSemester(it) }
+            .flatMap { mobileDeviceRepository.getDevices(it, forceRefresh) }
+            .map { items -> items.map { MobileDeviceItem(it) } }
+            .subscribeOn(schedulers.backgroundThread)
+            .observeOn(schedulers.mainThread)
+            .doFinally {
+                view?.run {
+                    hideRefresh()
+                    showProgress(false)
+                    enableSwipe(true)
+                }
+            }.subscribe({
+                Timber.i("Loading mobile devices result: Success")
+                view?.run {
+                    updateData(it)
+                    showContent(it.isNotEmpty())
+                    showEmpty(it.isEmpty())
+                }
+                analytics.logEvent("load_devices", "items" to it.size, "force_refresh" to forceRefresh)
+            }) {
+                Timber.i("Loading mobile devices result: An exception occurred")
+                errorHandler.dispatch(it)
+            })
+    }
+
+    fun onRegisterDevice() {
+        view?.showTokenDialog()
+    }
+
+    fun onUnregisterDevice(device: MobileDevice, position: Int) {
+        view?.run {
+            showUndo(position, device)
+            showEmpty(isViewEmpty)
+        }
+    }
+
+    fun onUnregisterCancelled() {
+        view?.run {
+            restoreDeleteItem()
+            showEmpty(isViewEmpty)
+        }
+    }
+
+    fun onUnregisterConfirmed(device: MobileDevice) {
+        Timber.i("Unregister device started")
+        disposable.add(studentRepository.getCurrentStudent()
+            .flatMap { semesterRepository.getCurrentSemester(it) }
+            .flatMap { semester ->
+                mobileDeviceRepository.unregisterDevice(semester, device)
+                    .flatMap { mobileDeviceRepository.getDevices(semester, it) }
+            }
+            .map { items -> items.map { MobileDeviceItem(it) } }
+            .subscribeOn(schedulers.backgroundThread)
+            .observeOn(schedulers.mainThread)
+            .doFinally {
+                view?.run {
+                    showProgress(false)
+                    enableSwipe(true)
+                }
+            }
+            .subscribe({
+                Timber.i("Unregister device result: Success")
+                view?.run {
+                    updateData(it)
+                    showContent(it.isNotEmpty())
+                    showEmpty(it.isEmpty())
+                }
+            }) {
+                Timber.i("Unregister device result: An exception occurred")
+                errorHandler.dispatch(it)
+            }
+        )
+    }
+}
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDeviceView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDeviceView.kt
new file mode 100644
index 00000000..58804e24
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/MobileDeviceView.kt
@@ -0,0 +1,31 @@
+package io.github.wulkanowy.ui.modules.mobiledevice
+
+import io.github.wulkanowy.data.db.entities.MobileDevice
+import io.github.wulkanowy.ui.base.BaseView
+
+interface MobileDeviceView : BaseView {
+
+    val isViewEmpty: Boolean
+
+    fun initView()
+
+    fun updateData(data: List<MobileDeviceItem>)
+
+    fun restoreDeleteItem()
+
+    fun hideRefresh()
+
+    fun clearData()
+
+    fun showProgress(show: Boolean)
+
+    fun enableSwipe(enable: Boolean)
+
+    fun showContent(show: Boolean)
+
+    fun showEmpty(show: Boolean)
+
+    fun showUndo(position: Int, device: MobileDevice)
+
+    fun showTokenDialog()
+}
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/token/MobileDeviceTokenDialog.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/token/MobileDeviceTokenDialog.kt
new file mode 100644
index 00000000..a4110128
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/token/MobileDeviceTokenDialog.kt
@@ -0,0 +1,89 @@
+package io.github.wulkanowy.ui.modules.mobiledevice.token
+
+import android.graphics.BitmapFactory
+import android.os.Bundle
+import android.util.Base64
+import android.view.LayoutInflater
+import android.view.View
+import android.view.View.GONE
+import android.view.View.VISIBLE
+import android.view.ViewGroup
+import android.widget.Toast
+import dagger.android.support.DaggerDialogFragment
+import io.github.wulkanowy.R
+import io.github.wulkanowy.data.pojos.MobileDeviceToken
+import io.github.wulkanowy.data.repositories.mobiledevice.MobileDeviceRemote
+import io.github.wulkanowy.ui.base.BaseActivity
+import kotlinx.android.synthetic.main.dialog_mobile_device.*
+import javax.inject.Inject
+
+class MobileDeviceTokenDialog : DaggerDialogFragment(), MobileDeviceTokenVIew {
+
+    @Inject
+    lateinit var presenter: MobileDeviceTokenPresenter
+
+    companion object {
+        fun newInstance(): MobileDeviceTokenDialog = MobileDeviceTokenDialog()
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setStyle(STYLE_NO_TITLE, 0)
+    }
+
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        return inflater.inflate(R.layout.dialog_mobile_device, container, false)
+    }
+
+    override fun onActivityCreated(savedInstanceState: Bundle?) {
+        super.onActivityCreated(savedInstanceState)
+        presenter.onAttachView(this)
+    }
+
+    override fun initView() {
+        mobileDeviceDialogClose.setOnClickListener { dismiss() }
+    }
+
+    override fun updateData(token: MobileDeviceToken) {
+        mobileDeviceDialogToken.text = token.token
+        mobileDeviceDialogSymbol.text = token.symbol
+        mobileDeviceDialogPin.text = token.pin
+
+        mobileDeviceQr.setImageBitmap(Base64.decode(token.qr, Base64.DEFAULT).let {
+            BitmapFactory.decodeByteArray(it, 0, it.size)
+        })
+    }
+
+    override fun hideLoading() {
+        mobileDeviceDialogProgress.visibility = GONE
+    }
+
+    override fun showContent() {
+        mobileDeviceDialogContent.visibility = VISIBLE
+    }
+
+    override fun closeDialog() {
+        dismiss()
+    }
+
+    override fun showError(text: String, error: Throwable) {
+        showMessage(text)
+    }
+
+    override fun showMessage(text: String) {
+        Toast.makeText(context, text, Toast.LENGTH_LONG).show()
+    }
+
+    override fun showExpiredDialog() {
+        (activity as? BaseActivity<*>)?.showExpiredDialog()
+    }
+
+    override fun openClearLoginView() {
+        (activity as? BaseActivity<*>)?.openClearLoginView()
+    }
+
+    override fun onDestroyView() {
+        presenter.onDetachView()
+        super.onDestroyView()
+    }
+}
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/token/MobileDeviceTokenPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/token/MobileDeviceTokenPresenter.kt
new file mode 100644
index 00000000..a778cbed
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/token/MobileDeviceTokenPresenter.kt
@@ -0,0 +1,51 @@
+package io.github.wulkanowy.ui.modules.mobiledevice.token
+
+import io.github.wulkanowy.data.repositories.mobiledevice.MobileDeviceRepository
+import io.github.wulkanowy.data.repositories.semester.SemesterRepository
+import io.github.wulkanowy.data.repositories.student.StudentRepository
+import io.github.wulkanowy.ui.base.BasePresenter
+import io.github.wulkanowy.ui.base.ErrorHandler
+import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
+import io.github.wulkanowy.utils.SchedulersProvider
+import timber.log.Timber
+import javax.inject.Inject
+
+class MobileDeviceTokenPresenter @Inject constructor(
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
+    private val semesterRepository: SemesterRepository,
+    private val mobileDeviceRepository: MobileDeviceRepository,
+    private val analytics: FirebaseAnalyticsHelper
+) : BasePresenter<MobileDeviceTokenVIew>(errorHandler, studentRepository, schedulers) {
+
+    override fun onAttachView(view: MobileDeviceTokenVIew) {
+        super.onAttachView(view)
+        view.initView()
+        Timber.i("Mobile device view was initialized")
+        loadData()
+    }
+
+    private fun loadData() {
+        Timber.i("Mobile device registration data started")
+        disposable.add(studentRepository.getCurrentStudent()
+            .flatMap { semesterRepository.getCurrentSemester(it) }
+            .flatMap { mobileDeviceRepository.getToken(it) }
+            .subscribeOn(schedulers.backgroundThread)
+            .observeOn(schedulers.mainThread)
+            .doFinally { view?.hideLoading() }
+            .subscribe({
+                Timber.i("Mobile device registration result: Success")
+                view?.run {
+                    updateData(it)
+                    showContent()
+                }
+                analytics.logEvent("device_register", "symbol" to it.token.substring(0, 3))
+            }) {
+                Timber.i("Mobile device registration result: An exception occurred")
+                view?.closeDialog()
+                errorHandler.dispatch(it)
+            }
+        )
+    }
+}
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/token/MobileDeviceTokenVIew.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/token/MobileDeviceTokenVIew.kt
new file mode 100644
index 00000000..950f8bcf
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/mobiledevice/token/MobileDeviceTokenVIew.kt
@@ -0,0 +1,17 @@
+package io.github.wulkanowy.ui.modules.mobiledevice.token
+
+import io.github.wulkanowy.data.pojos.MobileDeviceToken
+import io.github.wulkanowy.ui.base.BaseView
+
+interface MobileDeviceTokenVIew : BaseView {
+
+    fun initView()
+
+    fun hideLoading()
+
+    fun showContent()
+
+    fun closeDialog()
+
+    fun updateData(token: MobileDeviceToken)
+}
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/more/MoreFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/more/MoreFragment.kt
index 4823dedf..8b50a1c8 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/more/MoreFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/more/MoreFragment.kt
@@ -17,6 +17,7 @@ import io.github.wulkanowy.ui.modules.luckynumber.LuckyNumberFragment
 import io.github.wulkanowy.ui.modules.main.MainActivity
 import io.github.wulkanowy.ui.modules.main.MainView
 import io.github.wulkanowy.ui.modules.message.MessageFragment
+import io.github.wulkanowy.ui.modules.mobiledevice.MobileDeviceFragment
 import io.github.wulkanowy.ui.modules.note.NoteFragment
 import io.github.wulkanowy.ui.modules.settings.SettingsFragment
 import io.github.wulkanowy.utils.setOnItemClickListener
@@ -69,6 +70,14 @@ class MoreFragment : BaseFragment(), MoreView, MainView.TitledView, MainView.Mai
             }
         }
 
+    override val mobileDevicesRes: Pair<String, Drawable?>?
+        get() {
+            return context?.run {
+                getString(R.string.mobile_devices_title) to
+                    ContextCompat.getDrawable(this, R.drawable.ic_menu_main_mobile_devices_24dp)
+            }
+        }
+
     override val settingsRes: Pair<String, Drawable?>?
         get() {
             return context?.run {
@@ -127,6 +136,10 @@ class MoreFragment : BaseFragment(), MoreView, MainView.TitledView, MainView.Mai
         (activity as? MainActivity)?.pushView(LuckyNumberFragment.newInstance())
     }
 
+    override fun openMobileDevicesView() {
+        (activity as? MainActivity)?.pushView(MobileDeviceFragment.newInstance())
+    }
+
     override fun openSettingsView() {
         (activity as? MainActivity)?.pushView(SettingsFragment.newInstance())
     }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/more/MorePresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/more/MorePresenter.kt
index a7626ec0..f9fd5bbf 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/more/MorePresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/more/MorePresenter.kt
@@ -1,12 +1,18 @@
 package io.github.wulkanowy.ui.modules.more
 
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
+import io.github.wulkanowy.data.repositories.student.StudentRepository
 import io.github.wulkanowy.ui.base.BasePresenter
 import io.github.wulkanowy.ui.base.ErrorHandler
+import io.github.wulkanowy.utils.SchedulersProvider
 import timber.log.Timber
 import javax.inject.Inject
 
-class MorePresenter @Inject constructor(errorHandler: ErrorHandler) : BasePresenter<MoreView>(errorHandler) {
+class MorePresenter @Inject constructor(
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository
+) : BasePresenter<MoreView>(errorHandler, studentRepository, schedulers) {
 
     override fun onAttachView(view: MoreView) {
         super.onAttachView(view)
@@ -24,6 +30,7 @@ class MorePresenter @Inject constructor(errorHandler: ErrorHandler) : BasePresen
                     homeworkRes?.first -> openHomeworkView()
                     noteRes?.first -> openNoteView()
                     luckyNumberRes?.first -> openLuckyNumberView()
+                    mobileDevicesRes?.first -> openMobileDevicesView()
                     settingsRes?.first -> openSettingsView()
                     aboutRes?.first -> openAboutView()
                 }
@@ -44,6 +51,7 @@ class MorePresenter @Inject constructor(errorHandler: ErrorHandler) : BasePresen
                 homeworkRes?.let { MoreItem(it.first, it.second) },
                 noteRes?.let { MoreItem(it.first, it.second) },
                 luckyNumberRes?.let { MoreItem(it.first, it.second) },
+                mobileDevicesRes?.let { MoreItem(it.first, it.second) },
                 settingsRes?.let { MoreItem(it.first, it.second) },
                 aboutRes?.let { MoreItem(it.first, it.second) })
             )
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/more/MoreView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/more/MoreView.kt
index 333edc5d..9c1abb90 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/more/MoreView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/more/MoreView.kt
@@ -13,6 +13,8 @@ interface MoreView : BaseView {
 
     val luckyNumberRes: Pair<String, Drawable?>?
 
+    val mobileDevicesRes: Pair<String, Drawable?>?
+
     val settingsRes: Pair<String, Drawable?>?
 
     val aboutRes: Pair<String, Drawable?>?
@@ -34,4 +36,6 @@ interface MoreView : BaseView {
     fun openNoteView()
 
     fun openLuckyNumberView()
+
+    fun openMobileDevicesView()
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/note/NoteFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/note/NoteFragment.kt
index fc773e10..6117ae24 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/note/NoteFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/note/NoteFragment.kt
@@ -12,14 +12,14 @@ import eu.davidea.flexibleadapter.common.SmoothScrollLinearLayoutManager
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.R
 import io.github.wulkanowy.data.db.entities.Note
-import io.github.wulkanowy.ui.base.session.BaseSessionFragment
+import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.modules.main.MainActivity
 import io.github.wulkanowy.ui.modules.main.MainView
 import io.github.wulkanowy.utils.setOnItemClickListener
 import kotlinx.android.synthetic.main.fragment_note.*
 import javax.inject.Inject
 
-class NoteFragment : BaseSessionFragment(), NoteView, MainView.TitledView {
+class NoteFragment : BaseFragment(), NoteView, MainView.TitledView {
 
     @Inject
     lateinit var presenter: NotePresenter
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/note/NotePresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/note/NotePresenter.kt
index 136a4413..df98ab88 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/note/NotePresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/note/NotePresenter.kt
@@ -5,21 +5,21 @@ import io.github.wulkanowy.data.db.entities.Note
 import io.github.wulkanowy.data.repositories.note.NoteRepository
 import io.github.wulkanowy.data.repositories.semester.SemesterRepository
 import io.github.wulkanowy.data.repositories.student.StudentRepository
-import io.github.wulkanowy.ui.base.session.BaseSessionPresenter
-import io.github.wulkanowy.ui.base.session.SessionErrorHandler
+import io.github.wulkanowy.ui.base.BasePresenter
+import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
 import timber.log.Timber
 import javax.inject.Inject
 
 class NotePresenter @Inject constructor(
-    private val errorHandler: SessionErrorHandler,
-    private val schedulers: SchedulersProvider,
-    private val studentRepository: StudentRepository,
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val noteRepository: NoteRepository,
     private val semesterRepository: SemesterRepository,
     private val analytics: FirebaseAnalyticsHelper
-) : BaseSessionPresenter<NoteView>(errorHandler) {
+) : BasePresenter<NoteView>(errorHandler, studentRepository, schedulers) {
 
     override fun onAttachView(view: NoteView) {
         super.onAttachView(view)
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/note/NoteView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/note/NoteView.kt
index 38e6c94f..9a2c12eb 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/note/NoteView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/note/NoteView.kt
@@ -2,9 +2,9 @@ package io.github.wulkanowy.ui.modules.note
 
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.data.db.entities.Note
-import io.github.wulkanowy.ui.base.session.BaseSessionView
+import io.github.wulkanowy.ui.base.BaseView
 
-interface NoteView : BaseSessionView {
+interface NoteView : BaseView {
 
     val isViewEmpty: Boolean
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/settings/SettingsFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/settings/SettingsFragment.kt
index 2baad0eb..60de9920 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/settings/SettingsFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/settings/SettingsFragment.kt
@@ -5,10 +5,10 @@ import android.content.SharedPreferences
 import android.os.Bundle
 import com.takisoft.preferencex.PreferenceFragmentCompat
 import dagger.android.support.AndroidSupportInjection
-import io.github.wulkanowy.BuildConfig.DEBUG
 import io.github.wulkanowy.R
 import io.github.wulkanowy.ui.base.BaseActivity
 import io.github.wulkanowy.ui.modules.main.MainView
+import io.github.wulkanowy.utils.AppInfo
 import javax.inject.Inject
 
 class SettingsFragment : PreferenceFragmentCompat(), SharedPreferences.OnSharedPreferenceChangeListener,
@@ -17,6 +17,9 @@ class SettingsFragment : PreferenceFragmentCompat(), SharedPreferences.OnSharedP
     @Inject
     lateinit var presenter: SettingsPresenter
 
+    @Inject
+    lateinit var appInfo: AppInfo
+
     companion object {
         fun newInstance() = SettingsFragment()
     }
@@ -36,7 +39,7 @@ class SettingsFragment : PreferenceFragmentCompat(), SharedPreferences.OnSharedP
 
     override fun onCreatePreferencesFix(savedInstanceState: Bundle?, rootKey: String?) {
         addPreferencesFromResource(R.xml.scheme_preferences)
-        findPreference(getString(R.string.pref_key_notification_debug)).isVisible = DEBUG
+        findPreference(getString(R.string.pref_key_notification_debug)).isVisible = appInfo.isDebug
     }
 
     override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences, key: String) {
@@ -55,11 +58,19 @@ class SettingsFragment : PreferenceFragmentCompat(), SharedPreferences.OnSharedP
     }
 
     override fun showError(text: String, error: Throwable) {
-        (activity as? BaseActivity)?.showError(text, error)
+        (activity as? BaseActivity<*>)?.showError(text, error)
     }
 
     override fun showMessage(text: String) {
-        (activity as? BaseActivity)?.showMessage(text)
+        (activity as? BaseActivity<*>)?.showMessage(text)
+    }
+
+    override fun showExpiredDialog() {
+        (activity as? BaseActivity<*>)?.showExpiredDialog()
+    }
+
+    override fun openClearLoginView() {
+        (activity as? BaseActivity<*>)?.openClearLoginView()
     }
 
     override fun onResume() {
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/settings/SettingsPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/settings/SettingsPresenter.kt
index c25198d5..3c3d4990 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/settings/SettingsPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/settings/SettingsPresenter.kt
@@ -2,22 +2,26 @@ package io.github.wulkanowy.ui.modules.settings
 
 import com.readystatesoftware.chuck.api.ChuckCollector
 import io.github.wulkanowy.data.repositories.preferences.PreferencesRepository
+import io.github.wulkanowy.data.repositories.student.StudentRepository
 import io.github.wulkanowy.services.sync.SyncManager
 import io.github.wulkanowy.ui.base.BasePresenter
 import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
+import io.github.wulkanowy.utils.SchedulersProvider
 import io.github.wulkanowy.utils.isHolidays
 import org.threeten.bp.LocalDate.now
 import timber.log.Timber
 import javax.inject.Inject
 
 class SettingsPresenter @Inject constructor(
+    schedulers: SchedulersProvider,
     errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val preferencesRepository: PreferencesRepository,
     private val analytics: FirebaseAnalyticsHelper,
     private val syncManager: SyncManager,
     private val chuckCollector: ChuckCollector
-) : BasePresenter<SettingsView>(errorHandler) {
+) : BasePresenter<SettingsView>(errorHandler, studentRepository, schedulers) {
 
     override fun onAttachView(view: SettingsView) {
         super.onAttachView(view)
@@ -29,7 +33,7 @@ class SettingsPresenter @Inject constructor(
         Timber.i("Change settings $key")
         preferencesRepository.apply {
             when (key) {
-                serviceEnableKey -> syncManager.run { if (isServiceEnabled) startSyncWorker() else stopSyncWorker() }
+                serviceEnableKey -> with(syncManager) { if (isServiceEnabled) startSyncWorker() else stopSyncWorker() }
                 servicesIntervalKey, servicesOnlyWifiKey -> syncManager.startSyncWorker(true)
                 isDebugNotificationEnableKey -> chuckCollector.showNotification(isDebugNotificationEnable)
                 appThemeKey -> view?.recreateView()
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/splash/SplashActivity.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/splash/SplashActivity.kt
index 2bd62533..3e0106d1 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/splash/SplashActivity.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/splash/SplashActivity.kt
@@ -8,10 +8,10 @@ import io.github.wulkanowy.ui.modules.login.LoginActivity
 import io.github.wulkanowy.ui.modules.main.MainActivity
 import javax.inject.Inject
 
-class SplashActivity : BaseActivity(), SplashView {
+class SplashActivity : BaseActivity<SplashPresenter>(), SplashView {
 
     @Inject
-    lateinit var presenter: SplashPresenter
+    override lateinit var presenter: SplashPresenter
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -31,9 +31,4 @@ class SplashActivity : BaseActivity(), SplashView {
     override fun showError(text: String, error: Throwable) {
         Toast.makeText(this, text, LENGTH_LONG).show()
     }
-
-    override fun onDestroy() {
-        presenter.onDetachView()
-        super.onDestroy()
-    }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/splash/SplashPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/splash/SplashPresenter.kt
index b6bf0e2a..44b53c5f 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/splash/SplashPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/splash/SplashPresenter.kt
@@ -7,14 +7,14 @@ import io.github.wulkanowy.utils.SchedulersProvider
 import javax.inject.Inject
 
 class SplashPresenter @Inject constructor(
-    private val studentRepository: StudentRepository,
-    private val errorHandler: ErrorHandler,
-    private val schedulers: SchedulersProvider
-) : BasePresenter<SplashView>(errorHandler) {
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository
+) : BasePresenter<SplashView>(errorHandler, studentRepository, schedulers) {
 
     override fun onAttachView(view: SplashView) {
         super.onAttachView(view)
-        disposable.add(studentRepository.isStudentSaved()
+        disposable.add(studentRepository.isCurrentStudentSet()
             .subscribeOn(schedulers.backgroundThread)
             .observeOn(schedulers.mainThread)
             .subscribe({
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetableFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetableFragment.kt
index 26eaef27..e60be74c 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetableFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetableFragment.kt
@@ -13,7 +13,7 @@ import eu.davidea.flexibleadapter.common.SmoothScrollLinearLayoutManager
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.R
 import io.github.wulkanowy.data.db.entities.Timetable
-import io.github.wulkanowy.ui.base.session.BaseSessionFragment
+import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.modules.main.MainActivity
 import io.github.wulkanowy.ui.modules.main.MainView
 import io.github.wulkanowy.ui.modules.timetable.completed.CompletedLessonsFragment
@@ -21,7 +21,7 @@ import io.github.wulkanowy.utils.setOnItemClickListener
 import kotlinx.android.synthetic.main.fragment_timetable.*
 import javax.inject.Inject
 
-class TimetableFragment : BaseSessionFragment(), TimetableView, MainView.MainChildView, MainView.TitledView {
+class TimetableFragment : BaseFragment(), TimetableView, MainView.MainChildView, MainView.TitledView {
 
     @Inject
     lateinit var presenter: TimetablePresenter
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetablePresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetablePresenter.kt
index 5b837f07..baf347ae 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetablePresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetablePresenter.kt
@@ -1,14 +1,14 @@
 package io.github.wulkanowy.ui.modules.timetable
 
-import com.google.firebase.analytics.FirebaseAnalytics.Param.START_DATE
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.data.repositories.semester.SemesterRepository
 import io.github.wulkanowy.data.repositories.student.StudentRepository
 import io.github.wulkanowy.data.repositories.timetable.TimetableRepository
-import io.github.wulkanowy.ui.base.session.BaseSessionPresenter
-import io.github.wulkanowy.ui.base.session.SessionErrorHandler
+import io.github.wulkanowy.ui.base.BasePresenter
+import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
+import io.github.wulkanowy.utils.getLastSchoolDayIfHoliday
 import io.github.wulkanowy.utils.isHolidays
 import io.github.wulkanowy.utils.nextOrSameSchoolDay
 import io.github.wulkanowy.utils.nextSchoolDay
@@ -22,13 +22,15 @@ import java.util.concurrent.TimeUnit.MILLISECONDS
 import javax.inject.Inject
 
 class TimetablePresenter @Inject constructor(
-    private val errorHandler: SessionErrorHandler,
-    private val schedulers: SchedulersProvider,
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val timetableRepository: TimetableRepository,
-    private val studentRepository: StudentRepository,
     private val semesterRepository: SemesterRepository,
     private val analytics: FirebaseAnalyticsHelper
-) : BaseSessionPresenter<TimetableView>(errorHandler) {
+) : BasePresenter<TimetableView>(errorHandler, studentRepository, schedulers) {
+
+    private var baseDate: LocalDate = now().nextOrSameSchoolDay
 
     lateinit var currentDate: LocalDate
         private set
@@ -37,7 +39,8 @@ class TimetablePresenter @Inject constructor(
         super.onAttachView(view)
         view.initView()
         Timber.i("Timetable was initialized")
-        loadData(ofEpochDay(date ?: now().nextOrSameSchoolDay.toEpochDay()))
+        loadData(ofEpochDay(date ?: baseDate.toEpochDay()))
+        if (currentDate.isHolidays) setBaseDateOnHolidays()
         reloadView()
     }
 
@@ -60,7 +63,7 @@ class TimetablePresenter @Inject constructor(
         Timber.i("Timetable view is reselected")
         view?.also { view ->
             if (view.currentStackSize == 1) {
-                now().nextOrSameSchoolDay.also {
+                baseDate.also {
                     if (currentDate != it) {
                         loadData(it)
                         reloadView()
@@ -82,6 +85,20 @@ class TimetablePresenter @Inject constructor(
         return true
     }
 
+    private fun setBaseDateOnHolidays() {
+        disposable.add(studentRepository.getCurrentStudent()
+            .flatMap { semesterRepository.getCurrentSemester(it) }
+            .subscribeOn(schedulers.backgroundThread)
+            .observeOn(schedulers.mainThread)
+            .subscribe({
+                baseDate = baseDate.getLastSchoolDayIfHoliday(it.schoolYear)
+                currentDate = baseDate
+                reloadNavigation()
+            }) {
+                Timber.i("Loading semester result: An exception occurred")
+            })
+    }
+
     private fun loadData(date: LocalDate, forceRefresh: Boolean = false) {
         Timber.i("Loading timetable data started")
         currentDate = date
@@ -109,7 +126,7 @@ class TimetablePresenter @Inject constructor(
                         showEmpty(it.isEmpty())
                         showContent(it.isNotEmpty())
                     }
-                    analytics.logEvent("load_timetable", "items" to it.size, "force_refresh" to forceRefresh, START_DATE to currentDate.toFormattedString("yyyy-MM-dd"))
+                    analytics.logEvent("load_timetable", "items" to it.size, "force_refresh" to forceRefresh)
                 }) {
                     Timber.i("Loading timetable result: An exception occurred")
                     view?.run { showEmpty(isViewEmpty) }
@@ -126,8 +143,14 @@ class TimetablePresenter @Inject constructor(
             showContent(false)
             showEmpty(false)
             clearData()
-            showNextButton(!currentDate.plusDays(1).isHolidays)
+            reloadNavigation()
+        }
+    }
+
+    private fun reloadNavigation() {
+        view?.apply {
             showPreButton(!currentDate.minusDays(1).isHolidays)
+            showNextButton(!currentDate.plusDays(1).isHolidays)
             updateNavigationDay(currentDate.toFormattedString("EEEE\ndd.MM.YYYY").capitalize())
         }
     }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetableView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetableView.kt
index c08961c3..80a2f9b8 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetableView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetableView.kt
@@ -1,9 +1,9 @@
 package io.github.wulkanowy.ui.modules.timetable
 
 import io.github.wulkanowy.data.db.entities.Timetable
-import io.github.wulkanowy.ui.base.session.BaseSessionView
+import io.github.wulkanowy.ui.base.BaseView
 
-interface TimetableView : BaseSessionView {
+interface TimetableView : BaseView {
 
     val roomString: String
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/completed/CompletedLessonsErrorHandler.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/completed/CompletedLessonsErrorHandler.kt
index 50d55685..ed11607c 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/completed/CompletedLessonsErrorHandler.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/completed/CompletedLessonsErrorHandler.kt
@@ -3,13 +3,13 @@ package io.github.wulkanowy.ui.modules.timetable.completed
 import android.content.res.Resources
 import com.readystatesoftware.chuck.api.ChuckCollector
 import io.github.wulkanowy.api.interceptor.FeatureDisabledException
-import io.github.wulkanowy.ui.base.session.SessionErrorHandler
+import io.github.wulkanowy.ui.base.ErrorHandler
 import javax.inject.Inject
 
 class CompletedLessonsErrorHandler @Inject constructor(
     resources: Resources,
     chuckCollector: ChuckCollector
-) : SessionErrorHandler(resources, chuckCollector) {
+) : ErrorHandler(resources, chuckCollector) {
 
     var onFeatureDisabled: () -> Unit = {}
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/completed/CompletedLessonsFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/completed/CompletedLessonsFragment.kt
index bb328c41..f56652d5 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/completed/CompletedLessonsFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/completed/CompletedLessonsFragment.kt
@@ -10,14 +10,14 @@ import eu.davidea.flexibleadapter.common.SmoothScrollLinearLayoutManager
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.R
 import io.github.wulkanowy.data.db.entities.CompletedLesson
-import io.github.wulkanowy.ui.base.session.BaseSessionFragment
+import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.modules.main.MainActivity
 import io.github.wulkanowy.ui.modules.main.MainView
 import io.github.wulkanowy.utils.setOnItemClickListener
 import kotlinx.android.synthetic.main.fragment_timetable_completed.*
 import javax.inject.Inject
 
-class CompletedLessonsFragment : BaseSessionFragment(), CompletedLessonsView, MainView.TitledView {
+class CompletedLessonsFragment : BaseFragment(), CompletedLessonsView, MainView.TitledView {
 
     @Inject
     lateinit var presenter: CompletedLessonsPresenter
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/completed/CompletedLessonsPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/completed/CompletedLessonsPresenter.kt
index 6a14acda..b9e1fe2d 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/completed/CompletedLessonsPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/completed/CompletedLessonsPresenter.kt
@@ -1,13 +1,13 @@
 package io.github.wulkanowy.ui.modules.timetable.completed
 
-import com.google.firebase.analytics.FirebaseAnalytics.Param.START_DATE
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.data.repositories.completedlessons.CompletedLessonsRepository
 import io.github.wulkanowy.data.repositories.semester.SemesterRepository
 import io.github.wulkanowy.data.repositories.student.StudentRepository
-import io.github.wulkanowy.ui.base.session.BaseSessionPresenter
+import io.github.wulkanowy.ui.base.BasePresenter
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
+import io.github.wulkanowy.utils.getLastSchoolDayIfHoliday
 import io.github.wulkanowy.utils.isHolidays
 import io.github.wulkanowy.utils.nextOrSameSchoolDay
 import io.github.wulkanowy.utils.nextSchoolDay
@@ -21,13 +21,15 @@ import java.util.concurrent.TimeUnit
 import javax.inject.Inject
 
 class CompletedLessonsPresenter @Inject constructor(
-    private val schedulers: SchedulersProvider,
-    private val errorHandler: CompletedLessonsErrorHandler,
-    private val studentRepository: StudentRepository,
+    schedulers: SchedulersProvider,
+    studentRepository: StudentRepository,
+    private val completedLessonsErrorHandler: CompletedLessonsErrorHandler,
     private val semesterRepository: SemesterRepository,
     private val completedLessonsRepository: CompletedLessonsRepository,
     private val analytics: FirebaseAnalyticsHelper
-) : BaseSessionPresenter<CompletedLessonsView>(errorHandler) {
+) : BasePresenter<CompletedLessonsView>(completedLessonsErrorHandler, studentRepository, schedulers) {
+
+    private var baseDate: LocalDate = now().nextOrSameSchoolDay
 
     lateinit var currentDate: LocalDate
         private set
@@ -36,9 +38,10 @@ class CompletedLessonsPresenter @Inject constructor(
         super.onAttachView(view)
         Timber.i("Completed lessons is attached")
         view.initView()
-        loadData(ofEpochDay(date ?: now().nextOrSameSchoolDay.toEpochDay()))
+        loadData(ofEpochDay(date ?: baseDate.toEpochDay()))
+        if (currentDate.isHolidays) setBaseDateOnHolidays()
         reloadView()
-        errorHandler.onFeatureDisabled = {
+        completedLessonsErrorHandler.onFeatureDisabled = {
             this.view?.showFeatureDisabled()
             Timber.i("Completed lessons feature disabled by school")
         }
@@ -66,6 +69,20 @@ class CompletedLessonsPresenter @Inject constructor(
         }
     }
 
+    private fun setBaseDateOnHolidays() {
+        disposable.add(studentRepository.getCurrentStudent()
+            .flatMap { semesterRepository.getCurrentSemester(it) }
+            .subscribeOn(schedulers.backgroundThread)
+            .observeOn(schedulers.mainThread)
+            .subscribe({
+                baseDate = baseDate.getLastSchoolDayIfHoliday(it.schoolYear)
+                currentDate = baseDate
+                reloadNavigation()
+            }) {
+                Timber.i("Loading semester result: An exception occurred")
+            })
+    }
+
     private fun loadData(date: LocalDate, forceRefresh: Boolean = false) {
         Timber.i("Loading completed lessons data started")
         currentDate = date
@@ -93,11 +110,11 @@ class CompletedLessonsPresenter @Inject constructor(
                         showEmpty(it.isEmpty())
                         showContent(it.isNotEmpty())
                     }
-                    analytics.logEvent("load_completed_lessons", "items" to it.size, "force_refresh" to forceRefresh, START_DATE to currentDate.toFormattedString("yyyy-MM-dd"))
+                    analytics.logEvent("load_completed_lessons", "items" to it.size, "force_refresh" to forceRefresh)
                 }) {
                     Timber.i("Loading completed lessons result: An exception occurred")
                     view?.run { showEmpty(isViewEmpty) }
-                    errorHandler.dispatch(it)
+                    completedLessonsErrorHandler.dispatch(it)
                 })
         }
     }
@@ -110,8 +127,14 @@ class CompletedLessonsPresenter @Inject constructor(
             showContent(false)
             showEmpty(false)
             clearData()
-            showNextButton(!currentDate.plusDays(1).isHolidays)
+            reloadNavigation()
+        }
+    }
+
+    private fun reloadNavigation() {
+        view?.apply {
             showPreButton(!currentDate.minusDays(1).isHolidays)
+            showNextButton(!currentDate.plusDays(1).isHolidays)
             updateNavigationDay(currentDate.toFormattedString("EEEE\ndd.MM.YYYY").capitalize())
         }
     }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/completed/CompletedLessonsView.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/completed/CompletedLessonsView.kt
index 9607cc47..a8bef66f 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/completed/CompletedLessonsView.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/completed/CompletedLessonsView.kt
@@ -1,9 +1,9 @@
 package io.github.wulkanowy.ui.modules.timetable.completed
 
 import io.github.wulkanowy.data.db.entities.CompletedLesson
-import io.github.wulkanowy.ui.base.session.BaseSessionView
+import io.github.wulkanowy.ui.base.BaseView
 
-interface CompletedLessonsView : BaseSessionView {
+interface CompletedLessonsView : BaseView {
 
     val isViewEmpty: Boolean
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/timetablewidget/TimetableWidgetConfigureActivity.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/timetablewidget/TimetableWidgetConfigureActivity.kt
index 468567f1..79dd59bf 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/timetablewidget/TimetableWidgetConfigureActivity.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/timetablewidget/TimetableWidgetConfigureActivity.kt
@@ -18,13 +18,14 @@ import io.github.wulkanowy.utils.setOnItemClickListener
 import kotlinx.android.synthetic.main.activity_widget_configure.*
 import javax.inject.Inject
 
-class TimetableWidgetConfigureActivity : BaseActivity(), TimetableWidgetConfigureView {
+class TimetableWidgetConfigureActivity : BaseActivity<TimetableWidgetConfigurePresenter>(),
+    TimetableWidgetConfigureView {
 
     @Inject
     lateinit var configureAdapter: FlexibleAdapter<AbstractFlexibleItem<*>>
 
     @Inject
-    lateinit var presenter: TimetableWidgetConfigurePresenter
+    override lateinit var presenter: TimetableWidgetConfigurePresenter
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -71,9 +72,4 @@ class TimetableWidgetConfigureActivity : BaseActivity(), TimetableWidgetConfigur
     override fun openLoginView() {
         startActivity(LoginActivity.getStartIntent(this))
     }
-
-    override fun onDestroy() {
-        super.onDestroy()
-        presenter.onDetachView()
-    }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/timetablewidget/TimetableWidgetConfigurePresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/timetablewidget/TimetableWidgetConfigurePresenter.kt
index 5a7bdd7c..60fd03aa 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/timetablewidget/TimetableWidgetConfigurePresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/timetablewidget/TimetableWidgetConfigurePresenter.kt
@@ -11,11 +11,11 @@ import io.github.wulkanowy.utils.SchedulersProvider
 import javax.inject.Inject
 
 class TimetableWidgetConfigurePresenter @Inject constructor(
-    private val errorHandler: ErrorHandler,
-    private val schedulers: SchedulersProvider,
-    private val studentRepository: StudentRepository,
+    schedulers: SchedulersProvider,
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
     private val sharedPref: SharedPrefHelper
-) : BasePresenter<TimetableWidgetConfigureView>(errorHandler) {
+) : BasePresenter<TimetableWidgetConfigureView>(errorHandler, studentRepository, schedulers) {
 
     private var appWidgetId: Int? = null
 
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/timetablewidget/TimetableWidgetProvider.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/timetablewidget/TimetableWidgetProvider.kt
index 2b748760..a462ca7b 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/timetablewidget/TimetableWidgetProvider.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/timetablewidget/TimetableWidgetProvider.kt
@@ -161,11 +161,12 @@ class TimetableWidgetProvider : BroadcastReceiver() {
                             when {
                                 student != null -> Maybe.just(student)
                                 studentId != 0L -> {
-                                    studentRepository.getCurrentStudent(false)
-                                        .toMaybe()
+                                    studentRepository.isCurrentStudentSet()
+                                        .filter { true }
+                                        .flatMap { studentRepository.getCurrentStudent(false).toMaybe() }
                                         .doOnSuccess { sharedPref.putLong(getStudentWidgetKey(appWidgetId), it.id) }
                                 }
-                                else -> null
+                                else -> Maybe.empty()
                             }
                         }
                 }
diff --git a/app/src/main/java/io/github/wulkanowy/utils/AppInfo.kt b/app/src/main/java/io/github/wulkanowy/utils/AppInfo.kt
new file mode 100644
index 00000000..3fa83a04
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/utils/AppInfo.kt
@@ -0,0 +1,28 @@
+package io.github.wulkanowy.utils
+
+import android.os.Build.MANUFACTURER
+import android.os.Build.MODEL
+import android.os.Build.VERSION.SDK_INT
+import io.github.wulkanowy.BuildConfig.CRASHLYTICS_ENABLED
+import io.github.wulkanowy.BuildConfig.DEBUG
+import io.github.wulkanowy.BuildConfig.VERSION_CODE
+import io.github.wulkanowy.BuildConfig.VERSION_NAME
+import javax.inject.Singleton
+
+@Singleton
+open class AppInfo {
+
+    open val isCrashlyticsEnabled get() = CRASHLYTICS_ENABLED
+
+    open val isDebug get() = DEBUG
+
+    open val versionCode get() = VERSION_CODE
+
+    open val versionName get() = VERSION_NAME
+
+    open val systemVersion get() = SDK_INT
+
+    open val systemManufacturer: String get() = MANUFACTURER
+
+    open val systemModel: String get() = MODEL
+}
diff --git a/app/src/main/java/io/github/wulkanowy/utils/LoggerUtils.kt b/app/src/main/java/io/github/wulkanowy/utils/LoggerUtils.kt
index 5a6cc2bf..f9db0465 100644
--- a/app/src/main/java/io/github/wulkanowy/utils/LoggerUtils.kt
+++ b/app/src/main/java/io/github/wulkanowy/utils/LoggerUtils.kt
@@ -7,7 +7,6 @@ import android.os.Bundle
 import android.view.View
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.FragmentManager
-import com.crashlytics.android.Crashlytics
 import timber.log.Timber
 import javax.inject.Inject
 import javax.inject.Singleton
@@ -19,17 +18,6 @@ class DebugLogTree : Timber.DebugTree() {
     }
 }
 
-class CrashlyticsTree : Timber.Tree() {
-
-    override fun log(priority: Int, tag: String?, message: String, t: Throwable?) {
-        Crashlytics.setInt("priority", priority)
-        Crashlytics.setString("tag", tag)
-
-        if (t == null) Crashlytics.log(message)
-        else Crashlytics.logException(t)
-    }
-}
-
 class ActivityLifecycleLogger : Application.ActivityLifecycleCallbacks {
 
     override fun onActivityPaused(activity: Activity?) {
diff --git a/app/src/main/java/io/github/wulkanowy/utils/StringExtension.kt b/app/src/main/java/io/github/wulkanowy/utils/StringExtension.kt
new file mode 100644
index 00000000..65167fd7
--- /dev/null
+++ b/app/src/main/java/io/github/wulkanowy/utils/StringExtension.kt
@@ -0,0 +1,3 @@
+package io.github.wulkanowy.utils
+
+inline fun String?.ifNullOrBlank(defaultValue: () -> String) = if (this.isNullOrBlank()) defaultValue() else this
diff --git a/app/src/main/java/io/github/wulkanowy/utils/TimeExtension.kt b/app/src/main/java/io/github/wulkanowy/utils/TimeExtension.kt
index 426816f4..a2672f86 100644
--- a/app/src/main/java/io/github/wulkanowy/utils/TimeExtension.kt
+++ b/app/src/main/java/io/github/wulkanowy/utils/TimeExtension.kt
@@ -6,11 +6,11 @@ import org.threeten.bp.DayOfWeek.MONDAY
 import org.threeten.bp.DayOfWeek.SATURDAY
 import org.threeten.bp.DayOfWeek.SUNDAY
 import org.threeten.bp.Instant
+import org.threeten.bp.Instant.ofEpochMilli
 import org.threeten.bp.LocalDate
 import org.threeten.bp.LocalDateTime
 import org.threeten.bp.Month
 import org.threeten.bp.ZoneId
-import org.threeten.bp.format.DateTimeFormatter
 import org.threeten.bp.format.DateTimeFormatter.ofPattern
 import org.threeten.bp.format.TextStyle.FULL_STANDALONE
 import org.threeten.bp.temporal.TemporalAdjusters.firstInMonth
@@ -21,21 +21,15 @@ import java.util.Locale
 
 private const val DATE_PATTERN = "dd.MM.yyyy"
 
-fun Date.toLocalDate(): LocalDate {
-    return Instant.ofEpochMilli(this.time).atZone(ZoneId.systemDefault()).toLocalDate()
-}
+fun Date.toLocalDate(): LocalDate = Instant.ofEpochMilli(time).atZone(ZoneId.systemDefault()).toLocalDate()
 
-fun Date.toLocalDateTime(): LocalDateTime {
-    return Instant.ofEpochMilli(this.time).atZone(ZoneId.systemDefault()).toLocalDateTime()
-}
+fun Date.toLocalDateTime(): LocalDateTime = ofEpochMilli(time).atZone(ZoneId.systemDefault()).toLocalDateTime()
 
-fun String.toLocalDate(format: String = DATE_PATTERN): LocalDate {
-    return LocalDate.parse(this, DateTimeFormatter.ofPattern(format))
-}
+fun String.toLocalDate(format: String = DATE_PATTERN): LocalDate = LocalDate.parse(this, ofPattern(format))
 
-fun LocalDate.toFormattedString(format: String = DATE_PATTERN): String = this.format(ofPattern(format))
+fun LocalDate.toFormattedString(format: String = DATE_PATTERN): String = format(ofPattern(format))
 
-fun LocalDateTime.toFormattedString(format: String = DATE_PATTERN): String = this.format(ofPattern(format))
+fun LocalDateTime.toFormattedString(format: String = DATE_PATTERN): String = format(ofPattern(format))
 
 fun LocalDateTime.toDate(): Date = DateTimeUtils.toDate(atZone(ZoneId.systemDefault()).toInstant())
 
@@ -66,62 +60,81 @@ fun Month.getFormattedName(): String {
 
 inline val LocalDate.nextSchoolDay: LocalDate
     get() {
-        return when (this.dayOfWeek) {
-            FRIDAY, SATURDAY, SUNDAY -> this.with(next(MONDAY))
-            else -> this.plusDays(1)
+        return when (dayOfWeek) {
+            FRIDAY, SATURDAY, SUNDAY -> with(next(MONDAY))
+            else -> plusDays(1)
         }
     }
 
 inline val LocalDate.previousSchoolDay: LocalDate
     get() {
-        return when (this.dayOfWeek) {
-            SATURDAY, SUNDAY, MONDAY -> this.with(previous(FRIDAY))
-            else -> this.minusDays(1)
+        return when (dayOfWeek) {
+            SATURDAY, SUNDAY, MONDAY -> with(previous(FRIDAY))
+            else -> minusDays(1)
         }
     }
 
 inline val LocalDate.nextOrSameSchoolDay: LocalDate
     get() {
-        return when (this.dayOfWeek) {
-            SATURDAY, SUNDAY -> this.with(next(MONDAY))
+        return when (dayOfWeek) {
+            SATURDAY, SUNDAY -> with(next(MONDAY))
             else -> this
         }
     }
 
 inline val LocalDate.previousOrSameSchoolDay: LocalDate
     get() {
-        return when (this.dayOfWeek) {
-            SATURDAY, SUNDAY -> this.with(previous(FRIDAY))
+        return when (dayOfWeek) {
+            SATURDAY, SUNDAY -> with(previous(FRIDAY))
             else -> this
         }
     }
 
 inline val LocalDate.weekDayName: String
-    get() = this.format(ofPattern("EEEE", Locale.getDefault()))
+    get() = format(ofPattern("EEEE", Locale.getDefault()))
 
 inline val LocalDate.shortcutWeekDayName: String
-    get() = this.format(ofPattern("EEE", Locale.getDefault()))
+    get() = format(ofPattern("EEE", Locale.getDefault()))
 
 inline val LocalDate.monday: LocalDate
-    get() = this.with(MONDAY)
+    get() = with(MONDAY)
 
 inline val LocalDate.friday: LocalDate
-    get() = this.with(FRIDAY)
+    get() = with(FRIDAY)
 
 /**
  * [Dz.U. 2016 poz. 1335](http://prawo.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU20160001335)
  */
 
 inline val LocalDate.isHolidays: Boolean
-    get() {
-        return LocalDate.of(this.year, 9, 1).run {
-            when (dayOfWeek) {
-                FRIDAY, SATURDAY, SUNDAY -> with(firstInMonth(MONDAY))
-                else -> this
-            }
-        }.let { firstSchoolDay ->
-            LocalDate.of(this.year, 6, 20)
-                .with(next(FRIDAY))
-                .let { lastSchoolDay -> this.isBefore(firstSchoolDay) && this.isAfter(lastSchoolDay) }
+    get() = isBefore(firstSchoolDay) && isAfter(lastSchoolDay)
+
+inline val LocalDate.firstSchoolDay: LocalDate
+    get() = LocalDate.of(year, 9, 1).run {
+        when (dayOfWeek) {
+            FRIDAY, SATURDAY, SUNDAY -> with(firstInMonth(MONDAY))
+            else -> this
         }
     }
+
+inline val LocalDate.lastSchoolDay: LocalDate
+    get() = LocalDate.of(year, 6, 20)
+        .with(next(FRIDAY))
+
+
+private fun Int.getSchoolYearByMonth(monthValue: Int): Int {
+    return when (monthValue) {
+        in 9..12 -> this
+        else -> this + 1
+    }
+}
+
+fun LocalDate.getLastSchoolDayIfHoliday(schoolYear: Int): LocalDate {
+    val date = LocalDate.of(schoolYear.getSchoolYearByMonth(monthValue), monthValue, dayOfMonth)
+
+    if (date.isHolidays) {
+        return date.lastSchoolDay
+    }
+
+    return date
+}
diff --git a/app/src/main/play/release-notes/pl-PL/default.txt b/app/src/main/play/release-notes/pl-PL/default.txt
index e36d71ce..512e5055 100644
--- a/app/src/main/play/release-notes/pl-PL/default.txt
+++ b/app/src/main/play/release-notes/pl-PL/default.txt
@@ -1,7 +1,6 @@
-Wersja 0.8.2
+Wersja 0.9.4
 
-Naprawiliśmy:
-- rzadkie problemy ze stabilnością w aplikacji
-- częste problemy ze stabilnością w widżecie szczęśliwego numerka
+- naprawienie nawigacji we frekwencji, sprawdzianach, planie lekcji na wakacjach
+- wyświetlanie szczęśliwego numerka po ostatniej aktualizacji dziennika VULCAN (19.06)
 
 Pełna lista zmian: https://github.com/wulkanowy/wulkanowy/releases
diff --git a/app/src/main/res/drawable/ic_all_add_24dp.xml b/app/src/main/res/drawable/ic_all_add_24dp.xml
new file mode 100644
index 00000000..e3979cd7
--- /dev/null
+++ b/app/src/main/res/drawable/ic_all_add_24dp.xml
@@ -0,0 +1,5 @@
+<vector android:height="24dp" android:tint="#FFFFFF"
+    android:viewportHeight="24.0" android:viewportWidth="24.0"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M19,13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/>
+</vector>
diff --git a/app/src/main/res/drawable/ic_menu_main_mobile_devices_24dp.xml b/app/src/main/res/drawable/ic_menu_main_mobile_devices_24dp.xml
new file mode 100644
index 00000000..150ced43
--- /dev/null
+++ b/app/src/main/res/drawable/ic_menu_main_mobile_devices_24dp.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M4,6h18L22,4L4,4c-1.1,0 -2,0.9 -2,2v11L0,17v3h14v-3L4,17L4,6zM23,8h-6c-0.55,0 -1,0.45 -1,1v10c0,0.55 0.45,1 1,1h6c0.55,0 1,-0.45 1,-1L24,9c0,-0.55 -0.45,-1 -1,-1zM22,17h-4v-7h4v7z"/>
+</vector>
diff --git a/app/src/main/res/drawable/ic_message_delete_24dp.xml b/app/src/main/res/drawable/ic_message_delete_24dp.xml
index 3760de23..4a577483 100644
--- a/app/src/main/res/drawable/ic_message_delete_24dp.xml
+++ b/app/src/main/res/drawable/ic_message_delete_24dp.xml
@@ -1,10 +1,9 @@
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="24dp"
     android:height="24dp"
-    android:tint="#FFFFFF"
     android:viewportWidth="24.0"
     android:viewportHeight="24.0">
     <path
-        android:fillColor="#FF000000"
+        android:fillColor="#000"
         android:pathData="M6,19c0,1.1 0.9,2 2,2h8c1.1,0 2,-0.9 2,-2V7H6v12zM19,4h-3.5l-1,-1h-5l-1,1H5v2h14V4z" />
 </vector>
diff --git a/app/src/main/res/layout/dialog_mobile_device.xml b/app/src/main/res/layout/dialog_mobile_device.xml
new file mode 100644
index 00000000..c514205a
--- /dev/null
+++ b/app/src/main/res/layout/dialog_mobile_device.xml
@@ -0,0 +1,98 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".ui.modules.mobiledevice.token.MobileDeviceTokenDialog">
+
+    <FrameLayout
+        android:layout_width="300dp"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        android:padding="20dp">
+
+        <LinearLayout
+            android:id="@+id/mobileDeviceDialogContent"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical"
+            android:visibility="invisible"
+            tools:visibility="visible">
+
+            <ImageView
+                android:id="@+id/mobileDeviceQr"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:adjustViewBounds="true"
+                android:layout_gravity="center"
+                android:contentDescription="@string/mobile_device_qr"
+                android:layout_marginBottom="12dp" />
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/mobile_device_token"
+                android:textSize="17sp" />
+
+            <TextView
+                android:id="@+id/mobileDeviceDialogToken"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="3dp"
+                android:text="@string/all_no_data"
+                android:textIsSelectable="true"
+                android:textSize="12sp" />
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="10dp"
+                android:text="@string/mobile_device_symbol"
+                android:textSize="17sp" />
+
+            <TextView
+                android:id="@+id/mobileDeviceDialogSymbol"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="3dp"
+                android:text="@string/all_no_data"
+                android:textIsSelectable="true"
+                android:textSize="12sp" />
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="10dp"
+                android:text="@string/mobile_device_pin"
+                android:textSize="17sp" />
+
+            <TextView
+                android:id="@+id/mobileDeviceDialogPin"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="3dp"
+                android:text="@string/all_no_data"
+                android:textIsSelectable="true"
+                android:textSize="12sp" />
+
+            <Button
+                android:id="@+id/mobileDeviceDialogClose"
+                style="@style/Widget.AppCompat.Button.Borderless"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="end"
+                android:layout_marginTop="15dp"
+                android:text="@string/all_close"
+                android:textAllCaps="true"
+                android:textSize="15sp" />
+        </LinearLayout>
+
+        <ProgressBar
+            android:id="@+id/mobileDeviceDialogProgress"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center"
+            android:indeterminate="true"
+            tools:visibility="invisible" />
+    </FrameLayout>
+</ScrollView>
diff --git a/app/src/main/res/layout/fragment_mobile_device.xml b/app/src/main/res/layout/fragment_mobile_device.xml
new file mode 100644
index 00000000..289cf2f4
--- /dev/null
+++ b/app/src/main/res/layout/fragment_mobile_device.xml
@@ -0,0 +1,65 @@
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".ui.modules.mobiledevice.MobileDeviceFragment">
+
+    <ProgressBar
+        android:id="@+id/mobileDevicesProgress"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:indeterminate="true"
+        tools:visibility="invisible" />
+
+    <LinearLayout
+        android:id="@+id/mobileDevicesEmpty"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:gravity="center"
+        android:orientation="vertical"
+        android:padding="10dp"
+        android:visibility="gone">
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="20dp"
+            android:gravity="center"
+            android:text="@string/mobile_devices_no_items"
+            android:textSize="20sp" />
+
+        <ImageView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:minWidth="100dp"
+            android:minHeight="100dp"
+            app:srcCompat="@drawable/ic_menu_main_mobile_devices_24dp"
+            app:tint="?android:attr/textColorPrimary"
+            tools:ignore="contentDescription" />
+    </LinearLayout>
+
+    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
+        android:id="@+id/mobileDevicesSwipe"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/mobileDevicesRecycler"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            tools:listitem="@layout/item_mobile_device" />
+    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
+
+    <com.google.android.material.floatingactionbutton.FloatingActionButton
+        android:id="@+id/mobileDeviceAddButton"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="bottom|end"
+        android:layout_margin="16dp"
+        android:clickable="true"
+        android:focusable="true"
+        android:tint="#FFFFFF"
+        app:srcCompat="@drawable/ic_all_add_24dp" />
+</androidx.coordinatorlayout.widget.CoordinatorLayout>
diff --git a/app/src/main/res/layout/item_grade_summary.xml b/app/src/main/res/layout/item_grade_summary.xml
index 726a4d9c..b08c8780 100644
--- a/app/src/main/res/layout/item_grade_summary.xml
+++ b/app/src/main/res/layout/item_grade_summary.xml
@@ -24,7 +24,7 @@
             android:layout_marginRight="40dp"
             android:layout_weight="1"
             android:textSize="17sp"
-            tools:text="@tools:sample/lorem" />
+            tools:text="Fizyka" />
 
         <TextView
             android:id="@+id/gradeSummaryItemAverage"
@@ -32,7 +32,39 @@
             android:layout_height="wrap_content"
             android:gravity="end"
             android:textSize="12sp"
-            tools:text="@string/aboutlibrary_lib_version" />
+            tools:text="4.74" />
+    </LinearLayout>
+
+    <LinearLayout
+        android:id="@+id/gradeSummaryItemPointsContainer"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:background="@drawable/ic_all_divider"
+        android:minHeight="35dp"
+        android:orientation="horizontal">
+
+        <TextView
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical"
+            android:layout_marginStart="20dp"
+            android:layout_marginLeft="20dp"
+            android:layout_weight="1"
+            android:text="@string/grade_summary_points"
+            android:textSize="14sp" />
+
+        <TextView
+            android:id="@+id/gradeSummaryItemPoints"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical"
+            android:layout_marginStart="10dp"
+            android:layout_marginLeft="10dp"
+            android:layout_marginEnd="25dp"
+            android:layout_marginRight="25dp"
+            android:gravity="end"
+            android:textSize="12sp"
+            tools:text="123/150" />
     </LinearLayout>
 
     <LinearLayout
@@ -63,7 +95,7 @@
             android:layout_marginRight="25dp"
             android:gravity="end"
             android:textSize="12sp"
-            tools:text="@string/aboutlibrary_lib_version" />
+            tools:text="dobry" />
     </LinearLayout>
 
     <LinearLayout
@@ -94,6 +126,6 @@
             android:layout_marginRight="25dp"
             android:gravity="end"
             android:textSize="12sp"
-            tools:text="@string/aboutlibrary_lib_version" />
+            tools:text="bardzo dobry" />
     </LinearLayout>
 </LinearLayout>
diff --git a/app/src/main/res/layout/item_mobile_device.xml b/app/src/main/res/layout/item_mobile_device.xml
new file mode 100644
index 00000000..97245f97
--- /dev/null
+++ b/app/src/main/res/layout/item_mobile_device.xml
@@ -0,0 +1,52 @@
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/mobileDevice_subitem_container"
+    android:layout_width="match_parent"
+    android:layout_height="64dp"
+    tools:context=".ui.modules.mobiledevice.MobileDeviceItem">
+
+    <TextView
+        android:id="@+id/mobileDeviceItemName"
+        android:layout_width="match_parent"
+        android:layout_height="32dp"
+        android:layout_marginStart="16dp"
+        android:layout_marginLeft="16dp"
+        android:layout_toStartOf="@id/mobileDeviceItemUnregister"
+        android:layout_toLeftOf="@id/mobileDeviceItemUnregister"
+        android:ellipsize="end"
+        android:gravity="bottom"
+        android:maxLines="1"
+        android:textSize="16sp"
+        tools:text="@tools:sample/lorem/random" />
+
+    <TextView
+        android:id="@+id/mobileDeviceItemDate"
+        android:layout_width="match_parent"
+        android:layout_height="20dp"
+        android:layout_below="@id/mobileDeviceItemName"
+        android:layout_marginStart="16dp"
+        android:layout_marginLeft="16dp"
+        android:layout_toStartOf="@id/mobileDeviceItemUnregister"
+        android:layout_toLeftOf="@id/mobileDeviceItemUnregister"
+        android:gravity="bottom"
+        android:textColor="?android:textColorSecondary"
+        android:textSize="14sp"
+        tools:text="@tools:sample/date/ddmmyy" />
+
+    <ImageButton
+        android:id="@+id/mobileDeviceItemUnregister"
+        android:layout_width="48dp"
+        android:layout_height="48dp"
+        android:layout_alignParentEnd="true"
+        android:layout_alignParentRight="true"
+        android:layout_centerVertical="true"
+        android:layout_marginStart="4dp"
+        android:layout_marginLeft="4dp"
+        android:layout_marginEnd="4dp"
+        android:layout_marginRight="4dp"
+        android:background="?selectableItemBackgroundBorderless"
+        android:contentDescription="@string/mobile_devices_unregister"
+        app:srcCompat="@drawable/ic_message_delete_24dp"
+        app:tint="?android:textColorSecondary" />
+</RelativeLayout>
diff --git a/app/src/main/res/values-pl/strings.xml b/app/src/main/res/values-pl/strings.xml
index c1a5f2bc..91d980a6 100644
--- a/app/src/main/res/values-pl/strings.xml
+++ b/app/src/main/res/values-pl/strings.xml
@@ -21,7 +21,7 @@
 
     <!--Login-->
     <string name="login_header_default">Zaloguj się za pomocą konta ucznia lub rodzica</string>
-    <string name="login_header_symbol">Podaj symbol dziennika VULCAN</string>
+    <string name="login_header_symbol">Podaj symbol</string>
     <string name="login_nickname_hint">Email lub nick</string>
     <string name="login_password_hint">Hasło</string>
     <string name="login_host_hint">Dziennik</string>
@@ -32,7 +32,7 @@
     <string name="login_incorrect_symbol">Nie znaleziono ucznia. Sprawdź symbol</string>
     <string name="login_field_required">To pole jest wymagane</string>
     <string name="login_duplicate_student">Wybrany uczeń jest już zalogowany</string>
-    <string name="login_symbol_helper">Symbol znajduje się na stronie dziennika w zakładce Dostęp Mobilny</string>
+    <string name="login_symbol_helper">Symbol znajdziesz na stronie dziennika w Uczeń -> Dostęp Mobilny -> Zarejestruj urządzenie mobilne</string>
     <string name="login_select_student">Wybierz uczniów do zalogowania w aplikacji</string>
     <string name="login_privacy_policy">Polityka prywatności</string>
 
@@ -57,6 +57,7 @@
     <string name="grade_no_average">Brak średniej</string>
     <string name="grade_predicted">Przewidywana: %1$s</string>
     <string name="grade_final">Końcowa: %1$s</string>
+    <string name="grade_summary_points">Suma punktów</string>
     <string name="grade_summary_final_grade">Ocena końcowa</string>
     <string name="grade_summary_predicted_grade">Przewidywana ocena</string>
     <string name="grade_summary_calculated_average">Obliczona średnia</string>
@@ -203,6 +204,17 @@
     <string name="lucky_number_notify_new_item">Dziś szczęśliwym numerkiem jest: %d</string>
 
 
+    <!--Mobile devices-->
+    <string name="mobile_devices_title">Dostęp mobilny</string>
+    <string name="mobile_devices_no_items">Brak urządzeń</string>
+    <string name="mobile_devices_unregister">Wyrejestruj</string>
+    <string name="mobile_device_removed">Urządzenie usunięte</string>
+    <string name="mobile_device_qr">Kod QR</string>
+    <string name="mobile_device_token">Token</string>
+    <string name="mobile_device_symbol">Symbol</string>
+    <string name="mobile_device_pin">PIN</string>
+
+
     <!--Account-->
     <string name="account_add_new">Dodaj konto</string>
     <string name="account_logout">Wyloguj</string>
@@ -241,6 +253,7 @@
     <string name="pref_view_header">Wygląd</string>
     <string name="pref_view_list">Domyślny widok</string>
     <string name="pref_view_grade_average_mode">Obliczanie średniej końcoworocznej</string>
+    <string name="pref_view_grade_average_force_calc">Wymuś obliczanie średniej przez aplikację</string>
     <string name="pref_view_present">Pokazuj obecność we frekwencji</string>
     <string name="pref_view_app_theme">Motyw aplikacji</string>
     <string name="pref_view_expand_grade">Rozwiń oceny</string>
@@ -278,11 +291,12 @@
 
     <!--Others-->
     <string name="all_copied">Skopiowano</string>
+    <string name="all_undo">Cofnij</string>
 
 
     <!--Errors-->
     <string name="error_no_internet">Brak połączenia z internetem</string>
-    <string name="error_timeout">Zbyt długie oczekiwanie na połączenie</string>
+    <string name="error_timeout">Zbyt długie oczekiwanie na połączenie z dziennikiem</string>
     <string name="error_login_failed">Logowanie nie powiodło się. Spróbuj ponownie lub zrestartuj aplikację</string>
     <string name="error_service_unavailable">Dziennik jest niedostępny. Spróbuj ponownie później</string>
     <string name="error_unknown">Wystąpił nieoczekiwany błąd</string>
diff --git a/app/src/main/res/values-pl/value_prefernces.xml b/app/src/main/res/values-pl/value_prefernces.xml
index 19268ef1..868ead4d 100644
--- a/app/src/main/res/values-pl/value_prefernces.xml
+++ b/app/src/main/res/values-pl/value_prefernces.xml
@@ -7,7 +7,7 @@
         <item>2 godziny</item>
         <item>6 godzin</item>
         <item>12 godzin</item>
-        <item>24 godzin</item>
+        <item>24 godziny</item>
     </string-array>
 
     <string-array name="app_theme_entries">
diff --git a/app/src/main/res/values/preferences_keys.xml b/app/src/main/res/values/preferences_keys.xml
index b09ee51b..730fea59 100644
--- a/app/src/main/res/values/preferences_keys.xml
+++ b/app/src/main/res/values/preferences_keys.xml
@@ -6,6 +6,7 @@
     <string name="pref_key_grade_color_scheme">grade_color_scheme</string>
     <string name="pref_key_expand_grade">expand_grade</string>
     <string name="pref_key_grade_average_mode">grade_average_mode</string>
+    <string name="pref_key_grade_average_force_calc">grade_average_always_calc</string>
     <string name="pref_key_services_enable">services_enable</string>
     <string name="pref_key_services_interval">services_interval</string>
     <string name="pref_key_services_wifi_only">services_disable_wifi_only</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 704bb35b..fd94e5b6 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -21,7 +21,7 @@
 
     <!--Login-->
     <string name="login_header_default">Sign in with the student or parent account</string>
-    <string name="login_header_symbol">Enter the VULCAN diary symbol</string>
+    <string name="login_header_symbol">Enter the symbol</string>
     <string name="login_nickname_hint">Email or nick</string>
     <string name="login_password_hint">Password</string>
     <string name="login_host_hint">Register</string>
@@ -32,7 +32,7 @@
     <string name="login_incorrect_symbol">Student not found. Check the symbol</string>
     <string name="login_field_required">This field is required</string>
     <string name="login_duplicate_student">The selected student is already logged in</string>
-    <string name="login_symbol_helper">The symbol is located on the register page in the Mobile Access tab</string>
+    <string name="login_symbol_helper">The symbol can be found on the register page in Uczeń -> Dostęp Mobilny -> Zarejestruj urządzenie mobilne</string>
     <string name="login_select_student">Select students to log in to the application</string>
     <string name="login_privacy_policy">Privacy policy</string>
 
@@ -57,6 +57,7 @@
     <string name="grade_no_average">No average</string>
     <string name="grade_predicted">Predicted: %1$s</string>
     <string name="grade_final">Final: %1$s</string>
+    <string name="grade_summary_points">Total points</string>
     <string name="grade_summary_final_grade">Final grade</string>
     <string name="grade_summary_predicted_grade">Predicted grade</string>
     <string name="grade_summary_calculated_average">Calculated average</string>
@@ -187,6 +188,16 @@
     <string name="lucky_number_notify_new_item_title">Lucky number for today</string>
     <string name="lucky_number_notify_new_item">Today\'s lucky number is: %d</string>
 
+    <!--Mobile devices-->
+    <string name="mobile_devices_title">Mobile devices</string>
+    <string name="mobile_devices_no_items">No devices</string>
+    <string name="mobile_devices_unregister">Unregister</string>
+    <string name="mobile_device_removed">Device removed</string>
+    <string name="mobile_device_qr">QR code</string>
+    <string name="mobile_device_token">Token</string>
+    <string name="mobile_device_symbol">Symbol</string>
+    <string name="mobile_device_pin">PIN</string>
+
 
     <!--Account-->
     <string name="account_add_new">Add account</string>
@@ -226,6 +237,7 @@
     <string name="pref_view_header">Appearance</string>
     <string name="pref_view_list">Default view</string>
     <string name="pref_view_grade_average_mode">Calculation of the end-of-year average</string>
+    <string name="pref_view_grade_average_force_calc">Force average calculation by app</string>
     <string name="pref_view_present">Show presence in attendance</string>
     <string name="pref_view_app_theme">Application theme</string>
     <string name="pref_view_expand_grade">Expand grades</string>
@@ -263,11 +275,12 @@
 
     <!--Others-->
     <string name="all_copied">Copied</string>
+    <string name="all_undo">Undo</string>
 
 
     <!--Errors-->
     <string name="error_no_internet">No internet connection</string>
-    <string name="error_timeout">Too long wait for connection</string>
+    <string name="error_timeout">Too long waiting time for connection to the register</string>
     <string name="error_login_failed">Login is failed. Try again or restart the app</string>
     <string name="error_service_unavailable">The log is not available. Try again later</string>
     <string name="error_unknown">An unexpected error occurred</string>
diff --git a/app/src/main/res/xml/scheme_preferences.xml b/app/src/main/res/xml/scheme_preferences.xml
index 149024c0..ccacfe9d 100644
--- a/app/src/main/res/xml/scheme_preferences.xml
+++ b/app/src/main/res/xml/scheme_preferences.xml
@@ -105,6 +105,11 @@
             android:summary="%s"
             android:title="@string/pref_view_grade_average_mode"
             app:iconSpaceReserved="false" />
+        <SwitchPreference
+            android:defaultValue="false"
+            android:key="@string/pref_key_grade_average_force_calc"
+            android:title="@string/pref_view_grade_average_force_calc"
+            app:iconSpaceReserved="false" />
         <SwitchPreference
             android:defaultValue="true"
             android:key="@string/pref_key_fill_message_content"
diff --git a/app/src/play/java/io/github/wulkanowy/utils/CrashlyticsUtils.kt b/app/src/play/java/io/github/wulkanowy/utils/CrashlyticsUtils.kt
new file mode 100644
index 00000000..4f76ef83
--- /dev/null
+++ b/app/src/play/java/io/github/wulkanowy/utils/CrashlyticsUtils.kt
@@ -0,0 +1,31 @@
+package io.github.wulkanowy.utils
+
+import android.content.Context
+import com.crashlytics.android.Crashlytics
+import com.crashlytics.android.core.CrashlyticsCore
+import io.fabric.sdk.android.Fabric
+import timber.log.Timber
+
+fun initCrashlytics(context: Context, appInfo: AppInfo) {
+    Fabric.with(Fabric.Builder(context)
+        .kits(
+            Crashlytics.Builder()
+                .core(CrashlyticsCore.Builder()
+                    .disabled(!appInfo.isCrashlyticsEnabled)
+                    .build())
+                .build()
+        )
+        .debuggable(appInfo.isDebug)
+        .build())
+}
+
+class CrashlyticsTree : Timber.Tree() {
+
+    override fun log(priority: Int, tag: String?, message: String, t: Throwable?) {
+        Crashlytics.setInt("priority", priority)
+        Crashlytics.setString("tag", tag)
+
+        if (t == null) Crashlytics.log(message)
+        else Crashlytics.logException(t)
+    }
+}
diff --git a/app/src/main/java/io/github/wulkanowy/utils/FirebaseAnalyticsHelper.kt b/app/src/play/java/io/github/wulkanowy/utils/FirebaseAnalyticsHelper.kt
similarity index 79%
rename from app/src/main/java/io/github/wulkanowy/utils/FirebaseAnalyticsHelper.kt
rename to app/src/play/java/io/github/wulkanowy/utils/FirebaseAnalyticsHelper.kt
index e7ac9c99..6810e66a 100644
--- a/app/src/main/java/io/github/wulkanowy/utils/FirebaseAnalyticsHelper.kt
+++ b/app/src/play/java/io/github/wulkanowy/utils/FirebaseAnalyticsHelper.kt
@@ -1,12 +1,15 @@
 package io.github.wulkanowy.utils
 
+import android.content.Context
 import android.os.Bundle
 import com.google.firebase.analytics.FirebaseAnalytics
 import javax.inject.Inject
 import javax.inject.Singleton
 
 @Singleton
-class FirebaseAnalyticsHelper @Inject constructor(private val analytics: FirebaseAnalytics) {
+class FirebaseAnalyticsHelper @Inject constructor(private val context: Context) {
+
+    private val analytics by lazy { FirebaseAnalytics.getInstance(context) }
 
     fun logEvent(name: String, vararg params: Pair<String, Any?>) {
         Bundle().apply {
diff --git a/app/src/test/java/io/github/wulkanowy/data/repositories/mobiledevice/MobileDeviceRepositoryTest.kt b/app/src/test/java/io/github/wulkanowy/data/repositories/mobiledevice/MobileDeviceRepositoryTest.kt
new file mode 100644
index 00000000..9c1bb975
--- /dev/null
+++ b/app/src/test/java/io/github/wulkanowy/data/repositories/mobiledevice/MobileDeviceRepositoryTest.kt
@@ -0,0 +1,64 @@
+package io.github.wulkanowy.data.repositories.mobiledevice
+
+import com.github.pwittchen.reactivenetwork.library.rx2.internet.observing.InternetObservingSettings
+import io.github.wulkanowy.data.db.entities.MobileDevice
+import io.github.wulkanowy.data.db.entities.Semester
+import io.github.wulkanowy.data.repositories.UnitTestInternetObservingStrategy
+import io.reactivex.Maybe
+import io.reactivex.Single
+import org.junit.Before
+import org.junit.Test
+import org.mockito.Mock
+import org.mockito.Mockito.doReturn
+import org.mockito.Mockito.verify
+import org.mockito.MockitoAnnotations
+import org.threeten.bp.LocalDateTime.of
+
+class MobileDeviceRepositoryTest {
+
+    @Mock
+    private lateinit var semester: Semester
+
+    @Mock
+    private lateinit var mobileDeviceRemote: MobileDeviceRemote
+
+    @Mock
+    private lateinit var mobileDeviceLocal: MobileDeviceLocal
+
+    private lateinit var mobileDeviceRepository: MobileDeviceRepository
+
+    private val settings = InternetObservingSettings.builder()
+        .strategy(UnitTestInternetObservingStrategy())
+        .build()
+
+    @Before
+    fun initTest() {
+        MockitoAnnotations.initMocks(this)
+        mobileDeviceRepository = MobileDeviceRepository(settings, mobileDeviceLocal, mobileDeviceRemote)
+    }
+
+    @Test
+    fun getDevices() {
+        val devices = listOf(
+            getDeviceEntity(1),
+            getDeviceEntity(2)
+        )
+
+        doReturn(Maybe.empty<MobileDevice>()).`when`(mobileDeviceLocal).getDevices(semester)
+        doReturn(Single.just(devices)).`when`(mobileDeviceRemote).getDevices(semester)
+
+        mobileDeviceRepository.getDevices(semester).blockingGet()
+
+        verify(mobileDeviceLocal).deleteDevices(emptyList())
+        verify(mobileDeviceLocal).saveDevices(devices)
+    }
+
+    private fun getDeviceEntity(day: Int): MobileDevice {
+        return MobileDevice(
+            studentId = 1,
+            deviceId = 1,
+            name = "",
+            date = of(2019, 5, day, 0, 0, 0)
+        )
+    }
+}
diff --git a/app/src/test/java/io/github/wulkanowy/ui/modules/grade/GradeAverageProviderTest.kt b/app/src/test/java/io/github/wulkanowy/ui/modules/grade/GradeAverageProviderTest.kt
index 59dc3650..3197bb79 100644
--- a/app/src/test/java/io/github/wulkanowy/ui/modules/grade/GradeAverageProviderTest.kt
+++ b/app/src/test/java/io/github/wulkanowy/ui/modules/grade/GradeAverageProviderTest.kt
@@ -1,9 +1,11 @@
 package io.github.wulkanowy.ui.modules.grade
 
 import io.github.wulkanowy.data.db.entities.Grade
+import io.github.wulkanowy.data.db.entities.GradeSummary
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
 import io.github.wulkanowy.data.repositories.grade.GradeRepository
+import io.github.wulkanowy.data.repositories.gradessummary.GradeSummaryRepository
 import io.github.wulkanowy.data.repositories.preferences.PreferencesRepository
 import io.reactivex.Single
 import org.junit.Assert.assertEquals
@@ -23,6 +25,9 @@ class GradeAverageProviderTest {
     @Mock
     lateinit var gradeRepository: GradeRepository
 
+    @Mock
+    lateinit var gradeSummaryRepository: GradeSummaryRepository
+
     private lateinit var gradeAverageProvider: GradeAverageProvider
 
     private val student = Student("", "", "", "", "", 101, "", "", "", "", 1, true, LocalDateTime.now())
@@ -34,26 +39,27 @@ class GradeAverageProviderTest {
     )
 
     private val firstGrades = listOf(
-        getGrade(101, 22, "Matematyka", 4, .0, 1.0),
-        getGrade(101, 22, "Matematyka", 3, .0, 1.0),
-        getGrade(101, 22, "Fizyka", 6, .0, 1.0),
-        getGrade(101, 22, "Fizyka", 1, .0, 1.0)
+        getGrade(22, "Matematyka", 4),
+        getGrade(22, "Matematyka", 3),
+        getGrade(22, "Fizyka", 6),
+        getGrade(22, "Fizyka", 1)
     )
 
     private val secondGrade = listOf(
-        getGrade(101, 23, "Matematyka", 2, .0, 1.0),
-        getGrade(101, 23, "Matematyka", 3, .0, 1.0),
-        getGrade(101, 23, "Fizyka", 4, .0, 1.0),
-        getGrade(101, 23, "Fizyka", 2, .0, 1.0)
+        getGrade(23, "Matematyka", 2),
+        getGrade(23, "Matematyka", 3),
+        getGrade(23, "Fizyka", 4),
+        getGrade(23, "Fizyka", 2)
     )
 
     @Before
     fun initTest() {
         MockitoAnnotations.initMocks(this)
-        gradeAverageProvider = GradeAverageProvider(preferencesRepository, gradeRepository)
+        gradeAverageProvider = GradeAverageProvider(preferencesRepository, gradeRepository, gradeSummaryRepository)
 
         doReturn(.33).`when`(preferencesRepository).gradeMinusModifier
         doReturn(.33).`when`(preferencesRepository).gradePlusModifier
+        doReturn(false).`when`(preferencesRepository).gradeAverageForceCalc
 
         doReturn(Single.just(firstGrades)).`when`(gradeRepository).getGrades(student, semesters[1], true)
         doReturn(Single.just(secondGrade)).`when`(gradeRepository).getGrades(student, semesters[2], true)
@@ -62,6 +68,7 @@ class GradeAverageProviderTest {
     @Test
     fun onlyOneSemesterTest() {
         doReturn("only_one_semester").`when`(preferencesRepository).gradeAverageMode
+        doReturn(Single.just(emptyList<GradeSummary>())).`when`(gradeSummaryRepository).getGradesSummary(semesters[2], true)
 
         val averages = gradeAverageProvider.getGradeAverage(student, semesters, semesters[2].semesterId, true)
             .blockingGet()
@@ -74,6 +81,7 @@ class GradeAverageProviderTest {
     @Test
     fun allYearFirstSemesterTest() {
         doReturn("all_year").`when`(preferencesRepository).gradeAverageMode
+        doReturn(Single.just(emptyList<GradeSummary>())).`when`(gradeSummaryRepository).getGradesSummary(semesters[1], true)
 
         val averages = gradeAverageProvider.getGradeAverage(student, semesters, semesters[1].semesterId, true)
             .blockingGet()
@@ -87,6 +95,7 @@ class GradeAverageProviderTest {
     fun allYearSecondSemesterTest() {
         doReturn("all_year").`when`(preferencesRepository).gradeAverageMode
         doReturn(Single.just(firstGrades)).`when`(gradeRepository).getGrades(student, semesters[1], false)
+        doReturn(Single.just(emptyList<GradeSummary>())).`when`(gradeSummaryRepository).getGradesSummary(semesters[2], true)
 
         val averages = gradeAverageProvider.getGradeAverage(student, semesters, semesters[2].semesterId, true)
             .blockingGet()
@@ -103,14 +112,49 @@ class GradeAverageProviderTest {
         gradeAverageProvider.getGradeAverage(student, semesters, semesters[2].semesterId, true).blockingGet()
     }
 
-    private fun getGrade(studentId: Int, semesterId: Int, subject: String, value: Int, modifier: Double, weight: Double): Grade {
+    @Test
+    fun onlyOneSemester_averageFromSummary() {
+        doReturn("all_year").`when`(preferencesRepository).gradeAverageMode
+        doReturn(Single.just(firstGrades)).`when`(gradeRepository).getGrades(student, semesters[1], false)
+        doReturn(Single.just(listOf(
+            getSummary(22, "Matematyka", 3.1),
+            getSummary(22, "Fizyka", 3.26)
+        ))).`when`(gradeSummaryRepository).getGradesSummary(semesters[2], true)
+
+        val averages = gradeAverageProvider.getGradeAverage(student, semesters, semesters[2].semesterId, true)
+            .blockingGet()
+
+        assertEquals(2, averages.size)
+        assertEquals(3.1, averages["Matematyka"])
+        assertEquals(3.26, averages["Fizyka"])
+    }
+
+    @Test
+    fun onlyOneSemester_averageFromSummary_forceCalc() {
+        doReturn(true).`when`(preferencesRepository).gradeAverageForceCalc
+        doReturn("all_year").`when`(preferencesRepository).gradeAverageMode
+        doReturn(Single.just(firstGrades)).`when`(gradeRepository).getGrades(student, semesters[1], false)
+        doReturn(Single.just(listOf(
+            getSummary(22, "Matematyka", 3.1),
+            getSummary(22, "Fizyka", 3.26)
+        ))).`when`(gradeSummaryRepository).getGradesSummary(semesters[2], true)
+
+        val averages = gradeAverageProvider.getGradeAverage(student, semesters, semesters[2].semesterId, true)
+            .blockingGet()
+
+        assertEquals(2, averages.size)
+        assertEquals(3.0, averages["Matematyka"])
+        assertEquals(3.25, averages["Fizyka"])
+    }
+
+    private fun getGrade(semesterId: Int, subject: String, value: Int): Grade {
         return Grade(
-            studentId = studentId,
+            studentId = 101,
             semesterId = semesterId,
             subject = subject,
             value = value,
-            modifier = modifier,
-            weightValue = weight,
+            modifier = .0,
+            weightValue = 1.0,
             teacher = "",
             date = now(),
             weight = "",
@@ -121,4 +165,19 @@ class GradeAverageProviderTest {
             color = ""
         )
     }
+
+    private fun getSummary(semesterId: Int, subject: String, value: Double): GradeSummary {
+        return GradeSummary(
+            studentId = 101,
+            semesterId = semesterId,
+            subject = subject,
+            average = value,
+            pointsSum = "",
+            proposedPoints = "",
+            finalPoints = "",
+            finalGrade = "",
+            predictedGrade = "",
+            position = 0
+        )
+    }
 }
diff --git a/app/src/test/java/io/github/wulkanowy/ui/modules/login/LoginPresenterTest.kt b/app/src/test/java/io/github/wulkanowy/ui/modules/login/LoginPresenterTest.kt
index 54b3b879..75b7327a 100644
--- a/app/src/test/java/io/github/wulkanowy/ui/modules/login/LoginPresenterTest.kt
+++ b/app/src/test/java/io/github/wulkanowy/ui/modules/login/LoginPresenterTest.kt
@@ -1,5 +1,7 @@
 package io.github.wulkanowy.ui.modules.login
 
+import io.github.wulkanowy.TestSchedulersProvider
+import io.github.wulkanowy.data.repositories.student.StudentRepository
 import org.junit.Assert.assertNotEquals
 import org.junit.Before
 import org.junit.Test
@@ -17,6 +19,9 @@ class LoginPresenterTest {
     @Mock
     lateinit var errorHandler: LoginErrorHandler
 
+    @Mock
+    lateinit var studentRepository: StudentRepository
+
     private lateinit var presenter: LoginPresenter
 
     @Before
@@ -24,7 +29,7 @@ class LoginPresenterTest {
         MockitoAnnotations.initMocks(this)
         clearInvocations(loginView)
 
-        presenter = LoginPresenter(errorHandler)
+        presenter = LoginPresenter(TestSchedulersProvider(), errorHandler, studentRepository)
         presenter.onAttachView(loginView)
     }
 
diff --git a/app/src/test/java/io/github/wulkanowy/ui/modules/login/form/LoginFormPresenterTest.kt b/app/src/test/java/io/github/wulkanowy/ui/modules/login/form/LoginFormPresenterTest.kt
index b643a550..453adfba 100644
--- a/app/src/test/java/io/github/wulkanowy/ui/modules/login/form/LoginFormPresenterTest.kt
+++ b/app/src/test/java/io/github/wulkanowy/ui/modules/login/form/LoginFormPresenterTest.kt
@@ -4,6 +4,7 @@ import io.github.wulkanowy.TestSchedulersProvider
 import io.github.wulkanowy.data.db.entities.Student
 import io.github.wulkanowy.data.repositories.student.StudentRepository
 import io.github.wulkanowy.ui.modules.login.LoginErrorHandler
+import io.github.wulkanowy.utils.AppInfo
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.reactivex.Single
 import org.junit.Before
@@ -33,13 +34,16 @@ class LoginFormPresenterTest {
     @Mock
     lateinit var analytics: FirebaseAnalyticsHelper
 
+    @Mock
+    lateinit var appInfo: AppInfo
+
     private lateinit var presenter: LoginFormPresenter
 
     @Before
     fun initPresenter() {
         MockitoAnnotations.initMocks(this)
         clearInvocations(repository, loginFormView)
-        presenter = LoginFormPresenter(TestSchedulersProvider(), errorHandler, repository, analytics, false)
+        presenter = LoginFormPresenter(TestSchedulersProvider(), repository, errorHandler, analytics, appInfo)
         presenter.onAttachView(loginFormView)
     }
 
diff --git a/app/src/test/java/io/github/wulkanowy/ui/modules/login/studentselect/LoginStudentSelectPresenterTest.kt b/app/src/test/java/io/github/wulkanowy/ui/modules/login/studentselect/LoginStudentSelectPresenterTest.kt
index 17c16f41..16bcdebe 100644
--- a/app/src/test/java/io/github/wulkanowy/ui/modules/login/studentselect/LoginStudentSelectPresenterTest.kt
+++ b/app/src/test/java/io/github/wulkanowy/ui/modules/login/studentselect/LoginStudentSelectPresenterTest.kt
@@ -40,7 +40,7 @@ class LoginStudentSelectPresenterTest {
     fun initPresenter() {
         MockitoAnnotations.initMocks(this)
         clearInvocations(studentRepository, loginStudentSelectView)
-        presenter = LoginStudentSelectPresenter(errorHandler, studentRepository, TestSchedulersProvider(), analytics)
+        presenter = LoginStudentSelectPresenter(TestSchedulersProvider(), studentRepository, errorHandler, analytics)
         presenter.onAttachView(loginStudentSelectView, null)
     }
 
diff --git a/app/src/test/java/io/github/wulkanowy/ui/modules/main/MainPresenterTest.kt b/app/src/test/java/io/github/wulkanowy/ui/modules/main/MainPresenterTest.kt
index 1f5dc8de..93609897 100644
--- a/app/src/test/java/io/github/wulkanowy/ui/modules/main/MainPresenterTest.kt
+++ b/app/src/test/java/io/github/wulkanowy/ui/modules/main/MainPresenterTest.kt
@@ -40,7 +40,7 @@ class MainPresenterTest {
         MockitoAnnotations.initMocks(this)
         clearInvocations(mainView)
 
-        presenter = MainPresenter(errorHandler, studentRepository, prefRepository, syncManager, TestSchedulersProvider(), analytics)
+        presenter = MainPresenter(TestSchedulersProvider(), errorHandler, studentRepository, prefRepository, syncManager, analytics)
         presenter.onAttachView(mainView, null)
     }
 
diff --git a/app/src/test/java/io/github/wulkanowy/ui/modules/splash/SplashPresenterTest.kt b/app/src/test/java/io/github/wulkanowy/ui/modules/splash/SplashPresenterTest.kt
index fc25c095..34d0ce5c 100644
--- a/app/src/test/java/io/github/wulkanowy/ui/modules/splash/SplashPresenterTest.kt
+++ b/app/src/test/java/io/github/wulkanowy/ui/modules/splash/SplashPresenterTest.kt
@@ -27,19 +27,19 @@ class SplashPresenterTest {
     @Before
     fun initPresenter() {
         MockitoAnnotations.initMocks(this)
-        presenter = SplashPresenter(studentRepository, errorHandler, TestSchedulersProvider())
+        presenter = SplashPresenter(TestSchedulersProvider(), errorHandler, studentRepository)
     }
 
     @Test
     fun testOpenLoginView() {
-        doReturn(Single.just(false)).`when`(studentRepository).isStudentSaved()
+        doReturn(Single.just(false)).`when`(studentRepository).isCurrentStudentSet()
         presenter.onAttachView(splashView)
         verify(splashView).openLoginView()
     }
 
     @Test
     fun testMainMainView() {
-        doReturn(Single.just(true)).`when`(studentRepository).isStudentSaved()
+        doReturn(Single.just(true)).`when`(studentRepository).isCurrentStudentSet()
         presenter.onAttachView(splashView)
         verify(splashView).openMainView()
     }
diff --git a/app/src/test/java/io/github/wulkanowy/utils/GradeExtensionTest.kt b/app/src/test/java/io/github/wulkanowy/utils/GradeExtensionTest.kt
index 3b1ab648..31618fd4 100644
--- a/app/src/test/java/io/github/wulkanowy/utils/GradeExtensionTest.kt
+++ b/app/src/test/java/io/github/wulkanowy/utils/GradeExtensionTest.kt
@@ -33,10 +33,10 @@ class GradeExtensionTest {
     @Test
     fun calcSummaryAverage() {
         assertEquals(2.5, listOf(
-            GradeSummary(1, 1, "", "", "5"),
-            GradeSummary(1, 1, "", "", "-5"),
-            GradeSummary(1, 1, "", "", "test"),
-            GradeSummary(1, 1, "", "", "0")
+            createGradeSummary("5"),
+            createGradeSummary("-5"),
+            createGradeSummary("test"),
+            createGradeSummary("0")
         ).calcAverage(), 0.005)
     }
 
@@ -76,4 +76,19 @@ class GradeExtensionTest {
             teacher = ""
         )
     }
+
+    private fun createGradeSummary(finalGrade: String): GradeSummary {
+        return GradeSummary(
+            semesterId = 1,
+            studentId = 1,
+            position = 0,
+            subject = "",
+            predictedGrade = "",
+            finalGrade = finalGrade,
+            proposedPoints = "",
+            finalPoints = "",
+            pointsSum = "",
+            average = .0
+        )
+    }
 }
diff --git a/app/src/test/java/io/github/wulkanowy/utils/TimeExtensionTest.kt b/app/src/test/java/io/github/wulkanowy/utils/TimeExtensionTest.kt
index 442356dc..024b4727 100644
--- a/app/src/test/java/io/github/wulkanowy/utils/TimeExtensionTest.kt
+++ b/app/src/test/java/io/github/wulkanowy/utils/TimeExtensionTest.kt
@@ -4,7 +4,7 @@ import org.junit.Assert.assertEquals
 import org.junit.Assert.assertFalse
 import org.junit.Assert.assertTrue
 import org.junit.Test
-import org.threeten.bp.LocalDate
+import org.threeten.bp.LocalDate.of
 import org.threeten.bp.LocalDateTime
 import org.threeten.bp.Month.JANUARY
 import java.util.Locale
@@ -13,13 +13,13 @@ class TimeExtensionTest {
 
     @Test
     fun toLocalDateTest() {
-        assertEquals(LocalDate.of(1970, 1, 1), "1970-01-01".toLocalDate("yyyy-MM-dd"))
+        assertEquals(of(1970, 1, 1), "1970-01-01".toLocalDate("yyyy-MM-dd"))
     }
 
     @Test
     fun toFormattedStringLocalDateTest() {
-        assertEquals("01.10.2018", LocalDate.of(2018, 10, 1).toFormattedString())
-        assertEquals("2018-10.01", LocalDate.of(2018, 10, 1).toFormattedString("yyyy-MM.dd"))
+        assertEquals("01.10.2018", of(2018, 10, 1).toFormattedString())
+        assertEquals("2018-10.01", of(2018, 10, 1).toFormattedString("yyyy-MM.dd"))
     }
 
     @Test
@@ -30,20 +30,20 @@ class TimeExtensionTest {
 
     @Test
     fun mondayTest() {
-        assertEquals(LocalDate.of(2018, 10, 1), LocalDate.of(2018, 10, 2).monday)
-        assertEquals(LocalDate.of(2018, 10, 1), LocalDate.of(2018, 10, 5).monday)
-        assertEquals(LocalDate.of(2018, 10, 1), LocalDate.of(2018, 10, 6).monday)
-        assertEquals(LocalDate.of(2018, 10, 1), LocalDate.of(2018, 10, 7).monday)
-        assertEquals(LocalDate.of(2018, 10, 8), LocalDate.of(2018, 10, 8).monday)
+        assertEquals(of(2018, 10, 1), of(2018, 10, 2).monday)
+        assertEquals(of(2018, 10, 1), of(2018, 10, 5).monday)
+        assertEquals(of(2018, 10, 1), of(2018, 10, 6).monday)
+        assertEquals(of(2018, 10, 1), of(2018, 10, 7).monday)
+        assertEquals(of(2018, 10, 8), of(2018, 10, 8).monday)
     }
 
     @Test
     fun fridayTest() {
-        assertEquals(LocalDate.of(2018, 10, 5), LocalDate.of(2018, 10, 2).friday)
-        assertEquals(LocalDate.of(2018, 10, 5), LocalDate.of(2018, 10, 5).friday)
-        assertEquals(LocalDate.of(2018, 10, 5), LocalDate.of(2018, 10, 6).friday)
-        assertEquals(LocalDate.of(2018, 10, 5), LocalDate.of(2018, 10, 7).friday)
-        assertEquals(LocalDate.of(2018, 10, 12), LocalDate.of(2018, 10, 8).friday)
+        assertEquals(of(2018, 10, 5), of(2018, 10, 2).friday)
+        assertEquals(of(2018, 10, 5), of(2018, 10, 5).friday)
+        assertEquals(of(2018, 10, 5), of(2018, 10, 6).friday)
+        assertEquals(of(2018, 10, 5), of(2018, 10, 7).friday)
+        assertEquals(of(2018, 10, 12), of(2018, 10, 8).friday)
     }
 
     @Test
@@ -57,106 +57,118 @@ class TimeExtensionTest {
     @Test
     fun weekDayNameTest() {
         Locale.setDefault(Locale.forLanguageTag("PL"))
-        assertEquals("poniedziałek", LocalDate.of(2018, 10, 1).weekDayName)
+        assertEquals("poniedziałek", of(2018, 10, 1).weekDayName)
         Locale.setDefault(Locale.forLanguageTag("US"))
-        assertEquals("Monday", LocalDate.of(2018, 10, 1).weekDayName)
+        assertEquals("Monday", of(2018, 10, 1).weekDayName)
     }
 
     @Test
     fun nextSchoolDayTest() {
-        assertEquals(LocalDate.of(2018, 10, 2), LocalDate.of(2018, 10, 1).nextSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 3), LocalDate.of(2018, 10, 2).nextSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 4), LocalDate.of(2018, 10, 3).nextSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 5), LocalDate.of(2018, 10, 4).nextSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 8), LocalDate.of(2018, 10, 5).nextSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 8), LocalDate.of(2018, 10, 6).nextSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 8), LocalDate.of(2018, 10, 7).nextSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 9), LocalDate.of(2018, 10, 8).nextSchoolDay)
+        assertEquals(of(2018, 10, 2), of(2018, 10, 1).nextSchoolDay)
+        assertEquals(of(2018, 10, 3), of(2018, 10, 2).nextSchoolDay)
+        assertEquals(of(2018, 10, 4), of(2018, 10, 3).nextSchoolDay)
+        assertEquals(of(2018, 10, 5), of(2018, 10, 4).nextSchoolDay)
+        assertEquals(of(2018, 10, 8), of(2018, 10, 5).nextSchoolDay)
+        assertEquals(of(2018, 10, 8), of(2018, 10, 6).nextSchoolDay)
+        assertEquals(of(2018, 10, 8), of(2018, 10, 7).nextSchoolDay)
+        assertEquals(of(2018, 10, 9), of(2018, 10, 8).nextSchoolDay)
     }
 
     @Test
     fun previousSchoolDayTest() {
-        assertEquals(LocalDate.of(2018, 10, 9), LocalDate.of(2018, 10, 10).previousSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 8), LocalDate.of(2018, 10, 9).previousSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 5), LocalDate.of(2018, 10, 8).previousSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 5), LocalDate.of(2018, 10, 7).previousSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 5), LocalDate.of(2018, 10, 6).previousSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 4), LocalDate.of(2018, 10, 5).previousSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 3), LocalDate.of(2018, 10, 4).previousSchoolDay)
+        assertEquals(of(2018, 10, 9), of(2018, 10, 10).previousSchoolDay)
+        assertEquals(of(2018, 10, 8), of(2018, 10, 9).previousSchoolDay)
+        assertEquals(of(2018, 10, 5), of(2018, 10, 8).previousSchoolDay)
+        assertEquals(of(2018, 10, 5), of(2018, 10, 7).previousSchoolDay)
+        assertEquals(of(2018, 10, 5), of(2018, 10, 6).previousSchoolDay)
+        assertEquals(of(2018, 10, 4), of(2018, 10, 5).previousSchoolDay)
+        assertEquals(of(2018, 10, 3), of(2018, 10, 4).previousSchoolDay)
     }
 
     @Test
     fun nextOrSameSchoolDayTest() {
-        assertEquals(LocalDate.of(2018, 9, 28), LocalDate.of(2018, 9, 28).nextOrSameSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 1), LocalDate.of(2018, 9, 29).nextOrSameSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 1), LocalDate.of(2018, 9, 30).nextOrSameSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 1), LocalDate.of(2018, 10, 1).nextOrSameSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 2), LocalDate.of(2018, 10, 2).nextOrSameSchoolDay)
+        assertEquals(of(2018, 9, 28), of(2018, 9, 28).nextOrSameSchoolDay)
+        assertEquals(of(2018, 10, 1), of(2018, 9, 29).nextOrSameSchoolDay)
+        assertEquals(of(2018, 10, 1), of(2018, 9, 30).nextOrSameSchoolDay)
+        assertEquals(of(2018, 10, 1), of(2018, 10, 1).nextOrSameSchoolDay)
+        assertEquals(of(2018, 10, 2), of(2018, 10, 2).nextOrSameSchoolDay)
     }
 
     @Test
     fun previousOrSameSchoolDayTest() {
-        assertEquals(LocalDate.of(2018, 9, 28), LocalDate.of(2018, 9, 28).previousOrSameSchoolDay)
-        assertEquals(LocalDate.of(2018, 9, 28), LocalDate.of(2018, 9, 29).previousOrSameSchoolDay)
-        assertEquals(LocalDate.of(2018, 9, 28), LocalDate.of(2018, 9, 30).previousOrSameSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 1), LocalDate.of(2018, 10, 1).previousOrSameSchoolDay)
-        assertEquals(LocalDate.of(2018, 10, 2), LocalDate.of(2018, 10, 2).previousOrSameSchoolDay)
+        assertEquals(of(2018, 9, 28), of(2018, 9, 28).previousOrSameSchoolDay)
+        assertEquals(of(2018, 9, 28), of(2018, 9, 29).previousOrSameSchoolDay)
+        assertEquals(of(2018, 9, 28), of(2018, 9, 30).previousOrSameSchoolDay)
+        assertEquals(of(2018, 10, 1), of(2018, 10, 1).previousOrSameSchoolDay)
+        assertEquals(of(2018, 10, 2), of(2018, 10, 2).previousOrSameSchoolDay)
     }
 
     @Test
     fun isHolidays_schoolEndTest() {
-        assertFalse(LocalDate.of(2017, 6, 23).isHolidays)
-        assertFalse(LocalDate.of(2018, 6, 22).isHolidays)
-        assertFalse(LocalDate.of(2019, 6, 21).isHolidays)
-        assertFalse(LocalDate.of(2020, 6, 26).isHolidays)
-        assertFalse(LocalDate.of(2021, 6, 25).isHolidays)
-        assertFalse(LocalDate.of(2022, 6, 24).isHolidays)
-        assertFalse(LocalDate.of(2023, 6, 23).isHolidays)
-        assertFalse(LocalDate.of(2024, 6, 21).isHolidays)
-        assertFalse(LocalDate.of(2025, 6, 27).isHolidays)
+        assertFalse(of(2017, 6, 23).isHolidays)
+        assertFalse(of(2018, 6, 22).isHolidays)
+        assertFalse(of(2019, 6, 21).isHolidays)
+        assertFalse(of(2020, 6, 26).isHolidays)
+        assertFalse(of(2021, 6, 25).isHolidays)
+        assertFalse(of(2022, 6, 24).isHolidays)
+        assertFalse(of(2023, 6, 23).isHolidays)
+        assertFalse(of(2024, 6, 21).isHolidays)
+        assertFalse(of(2025, 6, 27).isHolidays)
     }
 
     @Test
     fun isHolidays_holidaysStartTest() {
-        assertTrue(LocalDate.of(2017, 6, 24).isHolidays)
-        assertTrue(LocalDate.of(2018, 6, 23).isHolidays)
-        assertTrue(LocalDate.of(2019, 6, 22).isHolidays)
-        assertTrue(LocalDate.of(2020, 6, 27).isHolidays)
-        assertTrue(LocalDate.of(2021, 6, 26).isHolidays)
-        assertTrue(LocalDate.of(2022, 6, 25).isHolidays)
-        assertTrue(LocalDate.of(2023, 6, 24).isHolidays)
-        assertTrue(LocalDate.of(2024, 6, 22).isHolidays)
-        assertTrue(LocalDate.of(2025, 6, 28).isHolidays)
+        assertTrue(of(2017, 6, 24).isHolidays)
+        assertTrue(of(2018, 6, 23).isHolidays)
+        assertTrue(of(2019, 6, 22).isHolidays)
+        assertTrue(of(2020, 6, 27).isHolidays)
+        assertTrue(of(2021, 6, 26).isHolidays)
+        assertTrue(of(2022, 6, 25).isHolidays)
+        assertTrue(of(2023, 6, 24).isHolidays)
+        assertTrue(of(2024, 6, 22).isHolidays)
+        assertTrue(of(2025, 6, 28).isHolidays)
     }
 
     @Test
     fun isHolidays_holidaysEndTest() {
-        assertTrue(LocalDate.of(2017, 9, 1).isHolidays) // friday
-        assertTrue(LocalDate.of(2017, 9, 2).isHolidays) // saturday
-        assertTrue(LocalDate.of(2017, 9, 3).isHolidays) // sunday
-        assertTrue(LocalDate.of(2018, 9, 1).isHolidays) // saturday
-        assertTrue(LocalDate.of(2018, 9, 2).isHolidays) // sunday
-        assertTrue(LocalDate.of(2019, 9, 1).isHolidays) // sunday
-        assertTrue(LocalDate.of(2020, 8, 31).isHolidays) // monday
-        assertTrue(LocalDate.of(2021, 8, 31).isHolidays) // tuesday
-        assertTrue(LocalDate.of(2022, 8, 31).isHolidays) // wednesday
-        assertTrue(LocalDate.of(2023, 9, 1).isHolidays) // friday
-        assertTrue(LocalDate.of(2023, 9, 2).isHolidays) // saturday
-        assertTrue(LocalDate.of(2023, 9, 3).isHolidays) // sunday
-        assertTrue(LocalDate.of(2024, 9, 1).isHolidays) // sunday
-        assertTrue(LocalDate.of(2025, 8, 31).isHolidays) // sunday
+        assertTrue(of(2017, 9, 1).isHolidays) // friday
+        assertTrue(of(2017, 9, 2).isHolidays) // saturday
+        assertTrue(of(2017, 9, 3).isHolidays) // sunday
+        assertTrue(of(2018, 9, 1).isHolidays) // saturday
+        assertTrue(of(2018, 9, 2).isHolidays) // sunday
+        assertTrue(of(2019, 9, 1).isHolidays) // sunday
+        assertTrue(of(2020, 8, 31).isHolidays) // monday
+        assertTrue(of(2021, 8, 31).isHolidays) // tuesday
+        assertTrue(of(2022, 8, 31).isHolidays) // wednesday
+        assertTrue(of(2023, 9, 1).isHolidays) // friday
+        assertTrue(of(2023, 9, 2).isHolidays) // saturday
+        assertTrue(of(2023, 9, 3).isHolidays) // sunday
+        assertTrue(of(2024, 9, 1).isHolidays) // sunday
+        assertTrue(of(2025, 8, 31).isHolidays) // sunday
     }
 
     @Test
     fun isHolidays_schoolStartTest() {
-        assertFalse(LocalDate.of(2017, 9, 4).isHolidays) // monday
-        assertFalse(LocalDate.of(2018, 9, 3).isHolidays) // monday
-        assertFalse(LocalDate.of(2019, 9, 2).isHolidays) // monday
-        assertFalse(LocalDate.of(2020, 9, 1).isHolidays) // tuesday
-        assertFalse(LocalDate.of(2021, 9, 1).isHolidays) // wednesday
-        assertFalse(LocalDate.of(2022, 9, 1).isHolidays) // thursday
-        assertFalse(LocalDate.of(2023, 9, 4).isHolidays) // monday
-        assertFalse(LocalDate.of(2024, 9, 2).isHolidays) // monday
-        assertFalse(LocalDate.of(2025, 9, 1).isHolidays) // monday
+        assertFalse(of(2017, 9, 4).isHolidays) // monday
+        assertFalse(of(2018, 9, 3).isHolidays) // monday
+        assertFalse(of(2019, 9, 2).isHolidays) // monday
+        assertFalse(of(2020, 9, 1).isHolidays) // tuesday
+        assertFalse(of(2021, 9, 1).isHolidays) // wednesday
+        assertFalse(of(2022, 9, 1).isHolidays) // thursday
+        assertFalse(of(2023, 9, 4).isHolidays) // monday
+        assertFalse(of(2024, 9, 2).isHolidays) // monday
+        assertFalse(of(2025, 9, 1).isHolidays) // monday
+    }
+
+    @Test
+    fun getCorrectedDate_holidays() {
+        assertEquals(of(2019, 6, 21), of(2019, 8, 9).getLastSchoolDayIfHoliday(2018))
+        assertEquals(of(2018, 6, 22), of(2019, 8, 9).getLastSchoolDayIfHoliday(2017))
+    }
+
+    @Test
+    fun getCorrectedDate_schoolYear() {
+        assertEquals(of(2019, 5, 1), of(2019, 5, 1).getLastSchoolDayIfHoliday(2018))
+        assertEquals(of(2018, 5, 1), of(2019, 5, 1).getLastSchoolDayIfHoliday(2017))
     }
 }
diff --git a/app/upload-key-encrypted.jks b/app/upload-key-encrypted.jks
deleted file mode 100644
index 6ad925d8..00000000
Binary files a/app/upload-key-encrypted.jks and /dev/null differ
diff --git a/build.gradle b/build.gradle
index ac6bde63..9a08dc70 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.3.31'
+    ext.kotlin_version = '1.3.41'
     repositories {
         mavenCentral()
         google()
@@ -9,11 +9,12 @@ buildscript {
     }
     dependencies {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-        classpath 'com.android.tools.build:gradle:3.4.0'
-        classpath 'com.google.gms:google-services:4.2.0'
-        classpath "io.fabric.tools:gradle:1.28.1"
-        classpath "com.github.triplet.gradle:play-publisher:2.2.0"
-        classpath "org.sonarsource.scanner.gradle:sonarqube-gradle-plugin:2.7"
+        classpath 'com.android.tools.build:gradle:3.4.2'
+        classpath 'com.google.gms:google-services:4.3.0'
+        classpath "io.fabric.tools:gradle:1.31.0"
+        classpath "com.github.triplet.gradle:play-publisher:2.2.1"
+        classpath "org.sonarsource.scanner.gradle:sonarqube-gradle-plugin:2.7.1"
+        classpath "gradle.plugin.com.star-zero.gradle:githook:1.1.0"
     }
 }
 
@@ -35,6 +36,7 @@ allprojects {
         jcenter()
         maven { url 'https://jitpack.io' }
         maven { url "https://kotlin.bintray.com/kotlinx/" }
+        maven { url "https://dl.bintray.com/mockito/maven" }
     }
 }