Version 0.8.2

* Add condition for error dialog
* Add safe call of forEach in LuckyNumberWidgetProvider

.circleci/config.yml

@@ -7,11 +7,11 @@ references:
 
   container_config: &container_config
     docker:
-      - image: circleci/android:api-28-alpha
+      - image: circleci/android:api-28
     working_directory: *workspace_root
     environment:
       environment:
-        JVM_OPTS: -Xmx3200m
+        _JAVA_OPTS: -Xmx3072m
 
   attach_workspace: &attach_workspace
     attach_workspace:

.idea/codeStyles/Project.xml

@@ -21,31 +21,6 @@
       <option name="CONTINUATION_INDENT_IN_ELVIS" value="false" />
       <option name="WRAP_ELVIS_EXPRESSIONS" value="0" />
     </JetCodeStyleSettings>
-    <Objective-C-extensions>
-      <file>
-        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Import" />
-        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Macro" />
-        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Typedef" />
-        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Enum" />
-        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Constant" />
-        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Global" />
-        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Struct" />
-        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="FunctionPredecl" />
-        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Function" />
-      </file>
-      <class>
-        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Property" />
-        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Synthesize" />
-        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="InitMethod" />
-        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="StaticMethod" />
-        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="InstanceMethod" />
-        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="DeallocMethod" />
-      </class>
-      <extensions>
-        <pair source="cpp" header="h" fileNamingConvention="NONE" />
-        <pair source="c" header="h" fileNamingConvention="NONE" />
-      </extensions>
-    </Objective-C-extensions>
     <XML>
       <option name="XML_KEEP_LINE_BREAKS" value="false" />
       <option name="XML_ALIGN_ATTRIBUTES" value="false" />

.travis.yml

@@ -14,7 +14,7 @@ cache:
 #branches:
 #  only:
 #    - master
-#  - 0.7.x
+#    - 0.8.x
 
 android:
  licenses:

app/build.gradle

@@ -16,8 +16,8 @@ android {
         testApplicationId "io.github.tests.wulkanowy"
         minSdkVersion 15
         targetSdkVersion 28
-        versionCode 30
+        versionCode 35
-        versionName "0.7.4"
+        versionName "0.8.2"
         multiDexEnabled true
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
@@ -80,53 +80,54 @@ androidExtensions {
 play {
     serviceAccountEmail = System.getenv("PLAY_SERVICE_ACCOUNT_EMAIL") ?: "jan@fakelog.cf"
     serviceAccountCredentials = file('key.p12')
-    defaultToAppBundles = true
+    defaultToAppBundles = false
     track = 'alpha'
 }
 
 dependencies {
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+    implementation 'io.github.wulkanowy:api:0.8.2'
-    implementation('io.github.wulkanowy:api:0.7.4') { exclude module: "threetenbp" }
 
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
     implementation "androidx.legacy:legacy-support-v4:1.0.0"
     implementation "androidx.appcompat:appcompat:1.0.2"
-    implementation "androidx.cardview:cardview:1.0.0"
-    implementation "com.google.android.material:material:1.0.0"
-    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     implementation 'androidx.multidex:multidex:2.0.1'
 
-    implementation "android.arch.work:work-runtime:1.0.0"
+    implementation "androidx.cardview:cardview:1.0.0"
-    implementation "android.arch.work:work-rxjava2:1.0.0"
+    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.room:room-runtime:2.1.0-alpha06"
+    implementation "androidx.work:work-runtime:2.0.1"
-    implementation "androidx.room:room-rxjava2:2.1.0-alpha06"
+    implementation "androidx.work:work-rxjava2:2.0.1"
-    kapt "androidx.room:room-compiler:2.1.0-alpha06"
 
-    implementation 'com.takisoft.preferencex:preferencex:1.0.0'
+    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 'com.squareup.inject:assisted-inject-annotations-dagger2:0.3.3'
+    implementation "com.google.dagger:dagger-android-support:2.22.1"
-    kapt 'com.squareup.inject:assisted-inject-processor-dagger2:0.3.3'
+    kapt "com.google.dagger:dagger-compiler:2.22.1"
-
+    kapt "com.google.dagger:dagger-android-processor:2.22.1"
-    implementation "com.google.dagger:dagger-android-support:2.21"
+    implementation 'com.squareup.inject:assisted-inject-annotations-dagger2:0.4.0'
-    kapt "com.google.dagger:dagger-compiler:2.21"
+    kapt 'com.squareup.inject:assisted-inject-processor-dagger2:0.4.0'
-    kapt "com.google.dagger:dagger-android-processor:2.21"
 
     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.github.wulkanowy:MaterialChipsInput:b72fd0ee6f'
-    implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0'
-
     implementation 'com.github.pwittchen:reactivenetwork-rx2:3.0.2'
     implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
-    implementation "io.reactivex.rxjava2:rxjava:2.2.7"
+    implementation "io.reactivex.rxjava2:rxjava:2.2.8"
 
+    implementation 'com.google.code.gson:gson:2.8.5'
     implementation "com.jakewharton.threetenabp:threetenabp:1.2.0"
     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.mikepenz:aboutlibraries:6.2.3"
+    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'
@@ -138,15 +139,15 @@ dependencies {
 
     testImplementation "junit:junit:4.12"
     testImplementation "io.mockk:mockk:1.9.2"
-    testImplementation "org.mockito:mockito-inline:2.25.1"
+    testImplementation "org.mockito:mockito-inline:2.27.0"
     testImplementation 'org.threeten:threetenbp:1.3.8'
 
     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:2.25.1'
+    androidTestImplementation 'org.mockito:mockito-android:2.27.0'
-    androidTestImplementation "androidx.room:room-testing:2.1.0-alpha06"
+    androidTestImplementation "androidx.room:room-testing:2.1.0-alpha07"
     androidTestImplementation "org.jetbrains.kotlin:kotlin-test:$kotlin_version"
 }
 

app/jacoco.gradle

@@ -31,17 +31,17 @@ task jacocoTestReport(type: JacocoReport) {
                     '**/*_Provide*Factory*.*',
                     '**/*_Factory.*']
 
-    classDirectories = fileTree(
+    classDirectories.setFrom(fileTree(
             dir: "$buildDir/intermediates/classes/debug",
             excludes: excludes
     ) + fileTree(
             dir: "$buildDir/tmp/kotlin-classes/debug",
             excludes: excludes
-    )
+    ))
 
-    sourceDirectories = files("$project.projectDir/src/main/java")
+    sourceDirectories.setFrom(files("$project.projectDir/src/main/java"))
-    executionData = fileTree(
+    executionData.setFrom(fileTree(
             dir: project.projectDir,
             includes: ["**/*.exec", "**/*.ec"]
-    )
+    ))
 }

app/src/androidTest/java/io/github/wulkanowy/data/db/migrations/AbstractMigrationTest.kt

@@ -0,0 +1,31 @@
+package io.github.wulkanowy.data.db.migrations
+
+import androidx.room.Room
+import androidx.room.testing.MigrationTestHelper
+import androidx.sqlite.db.framework.FrameworkSQLiteOpenHelperFactory
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.platform.app.InstrumentationRegistry
+import io.github.wulkanowy.data.db.AppDatabase
+import org.junit.Rule
+
+abstract class AbstractMigrationTest {
+
+    val dbName = "migration-test"
+
+    @get:Rule
+    val helper: MigrationTestHelper = MigrationTestHelper(
+        InstrumentationRegistry.getInstrumentation(),
+        AppDatabase::class.java.canonicalName,
+        FrameworkSQLiteOpenHelperFactory()
+    )
+
+    fun getMigratedRoomDatabase(): AppDatabase {
+        val database = Room.databaseBuilder(ApplicationProvider.getApplicationContext(),
+            AppDatabase::class.java, dbName)
+            .addMigrations(Migration12(), Migration13())
+            .build()
+        // close the database and release any stream resources when the test finishes
+        helper.closeWhenFinished(database)
+        return database
+    }
+}

app/src/androidTest/java/io/github/wulkanowy/data/db/migrations/Migration12Test.kt

@@ -2,33 +2,17 @@ package io.github.wulkanowy.data.db.migrations
 
 import android.content.ContentValues
 import android.database.sqlite.SQLiteDatabase.CONFLICT_FAIL
-import androidx.room.Room
-import androidx.room.testing.MigrationTestHelper
 import androidx.sqlite.db.SupportSQLiteDatabase
-import androidx.sqlite.db.framework.FrameworkSQLiteOpenHelperFactory
-import androidx.test.core.app.ApplicationProvider
 import androidx.test.ext.junit.runners.AndroidJUnit4
-import androidx.test.platform.app.InstrumentationRegistry
-import io.github.wulkanowy.data.db.AppDatabase
-import org.junit.Rule
 import org.junit.Test
 import org.junit.runner.RunWith
 import kotlin.test.assertEquals
 
 @RunWith(AndroidJUnit4::class)
-class Migration12Test {
+class Migration12Test : AbstractMigrationTest() {
-
-    private val dbName = "migration-test"
-
-    @get:Rule
-    val helper: MigrationTestHelper = MigrationTestHelper(
-        InstrumentationRegistry.getInstrumentation(),
-        AppDatabase::class.java.canonicalName,
-        FrameworkSQLiteOpenHelperFactory()
-    )
 
     @Test
-    fun migrate11To12_twoNotRelatedStudents() {
+    fun twoNotRelatedStudents() {
         helper.createDatabase(dbName, 11).apply {
             // user 1
             createStudent(this, 1, true)
@@ -61,7 +45,7 @@ class Migration12Test {
     }
 
     @Test
-    fun migrate11To12_removeStudentsWithoutClassId() {
+    fun removeStudentsWithoutClassId() {
         helper.createDatabase(dbName, 11).apply {
             // user 1
             createStudent(this, 1, true)
@@ -85,7 +69,7 @@ class Migration12Test {
     }
 
     @Test
-    fun migrate11To12_ensureThereIsOnlyOneCurrentStudent() {
+    fun ensureThereIsOnlyOneCurrentStudent() {
         helper.createDatabase(dbName, 11).apply {
             // user 1
             createStudent(this, 1, true)
@@ -146,14 +130,4 @@ class Migration12Test {
             put("unit_id", "99")
         })
     }
-
-    private fun getMigratedRoomDatabase(): AppDatabase {
-        val database = Room.databaseBuilder(ApplicationProvider.getApplicationContext(),
-            AppDatabase::class.java, dbName)
-            .addMigrations(Migration12())
-            .build()
-        // close the database and release any stream resources when the test finishes
-        helper.closeWhenFinished(database)
-        return database
-    }
 }

app/src/androidTest/java/io/github/wulkanowy/data/db/migrations/Migration13Test.kt

@@ -0,0 +1,171 @@
+package io.github.wulkanowy.data.db.migrations
+
+import android.content.ContentValues
+import android.database.sqlite.SQLiteDatabase
+import androidx.sqlite.db.SupportSQLiteDatabase
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Test
+import org.threeten.bp.LocalDate.of
+import kotlin.test.assertTrue
+
+class Migration13Test : AbstractMigrationTest() {
+
+    @Test
+    fun studentsWithSchoolNameWithClassName() {
+        helper.createDatabase(dbName, 12).apply {
+            createStudent(this, 1, "Klasa A - Publiczna szkoła Wulkanowego nr 1 w fakelog.cf", 1, 1)
+            createStudent(this, 2, "Klasa B - Publiczna szkoła Wulkanowego-fejka nr 1 w fakelog.cf", 2, 1)
+            createStudent(this, 2, "Klasa C - Publiczna szkoła Wulkanowego-fejka nr 2 w fakelog.cf", 1, 2)
+            close()
+        }
+
+        helper.runMigrationsAndValidate(dbName, 13, true, Migration13())
+
+        val db = getMigratedRoomDatabase()
+        val students = db.studentDao.loadAll().blockingGet()
+
+        assertEquals(3, students.size)
+
+        students[0].run {
+            assertEquals(1, studentId)
+            assertEquals("A", className)
+            assertEquals("Publiczna szkoła Wulkanowego nr 1 w fakelog.cf", schoolName)
+        }
+
+        students[1].run {
+            assertEquals(2, studentId)
+            assertEquals("B", className)
+            assertEquals("Publiczna szkoła Wulkanowego-fejka nr 1 w fakelog.cf", schoolName)
+        }
+
+        students[2].run {
+            assertEquals(2, studentId)
+            assertEquals("C", className)
+            assertEquals("Publiczna szkoła Wulkanowego-fejka nr 2 w fakelog.cf", schoolName)
+        }
+    }
+
+    @Test
+    fun studentsWithSchoolNameWithoutClassName() {
+        helper.createDatabase(dbName, 12).apply {
+            createStudent(this, 1, "Publiczna szkoła Wulkanowego nr 1 w fakelog.cf", 1)
+            createStudent(this, 2, "Publiczna szkoła Wulkanowego-fejka nr 1 w fakelog.cf", 1)
+            close()
+        }
+
+        helper.runMigrationsAndValidate(dbName, 13, true, Migration13())
+
+        val db = getMigratedRoomDatabase()
+        val students = db.studentDao.loadAll().blockingGet()
+
+        assertEquals(2, students.size)
+
+        students[0].run {
+            assertEquals(1, studentId)
+            assertEquals("", className)
+            assertEquals("Publiczna szkoła Wulkanowego nr 1 w fakelog.cf", schoolName)
+        }
+
+        students[1].run {
+            assertEquals(2, studentId)
+            assertEquals("", className)
+            assertEquals("Publiczna szkoła Wulkanowego-fejka nr 1 w fakelog.cf", schoolName)
+        }
+    }
+
+    @Test
+    fun markAtLeastAndOnlyOneSemesterAtCurrent() {
+        helper.createDatabase(dbName, 12).apply {
+            createStudent(this, 1, "", 5)
+            createSemester(this, 1, 5, 1, 1, false)
+            createSemester(this, 1, 5, 2, 1, false)
+            createSemester(this, 1, 5, 3, 2, false)
+            createSemester(this, 1, 5, 4, 2, false)
+
+            createStudent(this, 2, "", 5)
+            createSemester(this, 2, 5, 5, 5, true)
+            createSemester(this, 2, 5, 6, 5, true)
+            createSemester(this, 2, 5, 7, 55, true)
+            createSemester(this, 2, 5, 8, 55, true)
+
+            createStudent(this, 3, "", 5)
+            createSemester(this, 3, 5, 11, 99, false)
+            createSemester(this, 3, 5, 12, 99, false)
+            createSemester(this, 3, 5, 13, 100, false)
+            createSemester(this, 3, 5, 14, 100, true)
+            close()
+        }
+
+        helper.runMigrationsAndValidate(dbName, 13, true, Migration13())
+
+        val db = getMigratedRoomDatabase()
+
+        val semesters1 = db.semesterDao.loadAll(1, 5).blockingGet()
+        assertTrue { semesters1.single { it.isCurrent }.isCurrent }
+        semesters1[0].run {
+            assertFalse(isCurrent)
+            assertEquals(1, semesterId)
+            assertEquals(1, diaryId)
+        }
+        semesters1[2].run {
+            assertFalse(isCurrent)
+            assertEquals(3, semesterId)
+            assertEquals(2, diaryId)
+        }
+        semesters1[3].run {
+            assertTrue(isCurrent)
+            assertEquals(4, semesterId)
+            assertEquals(2, diaryId)
+        }
+
+        db.semesterDao.loadAll(2, 5).blockingGet().let {
+            assertTrue { it.single { it.isCurrent }.isCurrent }
+            assertEquals(1970, it[0].schoolYear)
+            assertEquals(of(1970, 1, 1), it[0].end)
+            assertEquals(of(1970, 1, 1), it[0].start)
+            assertFalse(it[0].isCurrent)
+            assertFalse(it[1].isCurrent)
+            assertFalse(it[2].isCurrent)
+            assertTrue(it[3].isCurrent)
+        }
+
+        db.semesterDao.loadAll(2, 5).blockingGet().let {
+            assertTrue { it.single { it.isCurrent }.isCurrent }
+            assertFalse(it[0].isCurrent)
+            assertFalse(it[1].isCurrent)
+            assertFalse(it[2].isCurrent)
+            assertTrue(it[3].isCurrent)
+        }
+    }
+
+    private fun createStudent(db: SupportSQLiteDatabase, studentId: Int, schoolName: String = "", classId: Int = -1, schoolId: Int = 123) {
+        db.insert("Students", SQLiteDatabase.CONFLICT_FAIL, ContentValues().apply {
+            put("endpoint", "https://fakelog.cf")
+            put("loginType", "STANDARD")
+            put("email", "jan@fakelog.cf")
+            put("password", "******")
+            put("symbol", "Default")
+            put("student_id", studentId)
+            put("class_id", classId)
+            put("student_name", "Jan Kowalski")
+            put("school_id", schoolId)
+            put("school_name", schoolName)
+            put("is_current", false)
+            put("registration_date", "0")
+        })
+    }
+
+    private fun createSemester(db: SupportSQLiteDatabase, studentId: Int, classId: Int, semesterId: Int, diaryId: Int, isCurrent: Boolean = false) {
+        db.insert("Semesters", SQLiteDatabase.CONFLICT_FAIL, ContentValues().apply {
+            put("student_id", studentId)
+            put("diary_id", diaryId)
+            put("diary_name", "IA")
+            put("semester_id", semesterId)
+            put("semester_name", "1")
+            put("is_current", isCurrent)
+            put("class_id", classId)
+            put("unit_id", "99")
+        })
+    }
+}

app/src/androidTest/java/io/github/wulkanowy/data/repositories/attendance/AttendanceLocalTest.kt

@@ -11,6 +11,7 @@ import org.junit.Before
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.threeten.bp.LocalDate
+import org.threeten.bp.LocalDate.now
 import kotlin.test.assertEquals
 
 @RunWith(AndroidJUnit4::class)
@@ -40,7 +41,7 @@ class AttendanceLocalTest {
         ))
 
         val attendance = attendanceLocal
-            .getAttendance(Semester(1, 2, "", 1, 3, true, 1, 1),
+            .getAttendance(Semester(1, 2, "", 1, 3, 2019, true, now(), now(), 1, 1),
                         LocalDate.of(2018, 9, 10),
                         LocalDate.of(2018, 9, 14)
                 )

app/src/androidTest/java/io/github/wulkanowy/data/repositories/completedlessons/CompletedLessonsLocalTest.kt

@@ -41,7 +41,7 @@ class CompletedLessonsLocalTest {
         ))
 
         val completed = completedLessonsLocal
-            .getCompletedLessons(Semester(1, 2, "", 1, 3, true, 1, 1),
+            .getCompletedLessons(Semester(1, 2, "", 1, 3, 2019, true, LocalDate.now(), LocalDate.now(), 1, 1),
                 LocalDate.of(2018, 9, 10),
                 LocalDate.of(2018, 9, 14)
             )

app/src/androidTest/java/io/github/wulkanowy/data/repositories/exam/ExamLocalTest.kt

@@ -40,7 +40,7 @@ class ExamLocalTest {
         ))
 
         val exams = examLocal
-            .getExams(Semester(1, 2, "", 1, 3, true, 1, 1),
+            .getExams(Semester(1, 2, "", 1, 3, 2019, true, LocalDate.now(), LocalDate.now(), 1, 1),
                         LocalDate.of(2018, 9, 10),
                         LocalDate.of(2018, 9, 14)
                 )

app/src/androidTest/java/io/github/wulkanowy/data/repositories/grade/GradeLocalTest.kt

@@ -10,6 +10,7 @@ import org.junit.Before
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.threeten.bp.LocalDate
+import org.threeten.bp.LocalDate.now
 import kotlin.test.assertEquals
 
 @RunWith(AndroidJUnit4::class)
@@ -39,8 +40,10 @@ class GradeLocalTest {
             createGradeLocal(3, 5.0, LocalDate.of(2019, 2, 28), "", 2)
         ))
 
+        val semester = Semester(1, 2, "", 2019, 2, 1, true, now(), now(), 1, 1)
+
         val grades = gradeLocal
-            .getGrades(Semester(1, 2, "", 2, 3, true, 1, 1))
+            .getGrades(semester)
             .blockingGet()
 
         assertEquals(2, grades.size)

app/src/androidTest/java/io/github/wulkanowy/data/repositories/grade/GradeRepositoryTest.kt

@@ -22,6 +22,7 @@ import org.junit.Test
 import org.junit.runner.RunWith
 import org.threeten.bp.LocalDate.of
 import org.threeten.bp.LocalDateTime
+import kotlin.test.assertEquals
 import kotlin.test.assertFalse
 import kotlin.test.assertTrue
 import io.github.wulkanowy.api.grades.Grade as GradeApi
@@ -109,4 +110,73 @@ class GradeRepositoryTest {
         assertTrue { grades[2].isRead }
         assertTrue { grades[3].isRead }
     }
+
+    @Test
+    fun subtractLocaleDuplicateGrades() {
+        gradeLocal.saveGrades(listOf(
+            createGradeLocal(5, 3.0, of(2019, 2, 25), "Taka sama ocena"),
+            createGradeLocal(5, 3.0, of(2019, 2, 25), "Taka sama ocena"),
+            createGradeLocal(3, 5.0, of(2019, 2, 26), "Jakaś inna ocena")
+        ))
+
+        every { mockApi.getGrades(1) } returns Single.just(listOf(
+            createGradeApi(5, 3.0, of(2019, 2, 25), "Taka sama ocena"),
+            createGradeApi(3, 5.0, of(2019, 2, 26), "Jakaś inna ocena")
+        ))
+
+        val grades = GradeRepository(settings, gradeLocal, gradeRemote)
+            .getGrades(studentMock, semesterMock, true).blockingGet()
+
+        assertEquals(2, grades.size)
+    }
+
+    @Test
+    fun subtractRemoteDuplicateGrades() {
+        gradeLocal.saveGrades(listOf(
+            createGradeLocal(5, 3.0, of(2019, 2, 25), "Taka sama ocena"),
+            createGradeLocal(3, 5.0, of(2019, 2, 26), "Jakaś inna ocena")
+        ))
+
+        every { mockApi.getGrades(1) } returns Single.just(listOf(
+            createGradeApi(5, 3.0, of(2019, 2, 25), "Taka sama ocena"),
+            createGradeApi(5, 3.0, of(2019, 2, 25), "Taka sama ocena"),
+            createGradeApi(3, 5.0, of(2019, 2, 26), "Jakaś inna ocena")
+        ))
+
+        val grades = GradeRepository(settings, gradeLocal, gradeRemote)
+            .getGrades(studentMock, semesterMock, true).blockingGet()
+
+        assertEquals(3, grades.size)
+    }
+
+    @Test
+    fun emptyLocal() {
+        gradeLocal.saveGrades(listOf())
+
+        every { mockApi.getGrades(1) } returns Single.just(listOf(
+            createGradeApi(5, 3.0, of(2019, 2, 25), "Taka sama ocena"),
+            createGradeApi(5, 3.0, of(2019, 2, 25), "Taka sama ocena"),
+            createGradeApi(3, 5.0, of(2019, 2, 26), "Jakaś inna ocena")
+        ))
+
+        val grades = GradeRepository(settings, gradeLocal, gradeRemote)
+            .getGrades(studentMock, semesterMock, true).blockingGet()
+
+        assertEquals(3, grades.size)
+    }
+
+    @Test
+    fun emptyRemote() {
+        gradeLocal.saveGrades(listOf(
+            createGradeLocal(5, 3.0, of(2019, 2, 25), "Taka sama ocena"),
+            createGradeLocal(3, 5.0, of(2019, 2, 26), "Jakaś inna ocena")
+        ))
+
+        every { mockApi.getGrades(1) } returns Single.just(listOf())
+
+        val grades = GradeRepository(settings, gradeLocal, gradeRemote)
+            .getGrades(studentMock, semesterMock, true).blockingGet()
+
+        assertEquals(0, grades.size)
+    }
 }

app/src/androidTest/java/io/github/wulkanowy/data/repositories/gradestatistics/GradeStatisticsLocalTest.kt

@@ -10,6 +10,7 @@ import org.junit.After
 import org.junit.Before
 import org.junit.Test
 import org.junit.runner.RunWith
+import org.threeten.bp.LocalDate
 import kotlin.test.assertEquals
 
 @RunWith(AndroidJUnit4::class)
@@ -39,7 +40,7 @@ class GradeStatisticsLocalTest {
         ))
 
         val stats = gradeStatisticsLocal.getGradesStatistics(
-            Semester(2, 2, "", 1, 2, true, 1, 1), false,
+            Semester(2, 2, "", 2019, 1, 2, true, LocalDate.now(), LocalDate.now(), 1, 1), false,
             "Matematyka"
         ).blockingGet()
         assertEquals(1, stats.size)
@@ -55,7 +56,7 @@ class GradeStatisticsLocalTest {
         ))
 
         val stats = gradeStatisticsLocal.getGradesStatistics(
-            Semester(2, 2, "", 1, 2, true, 1, 1), false,
+            Semester(2, 2, "", 2019, 1, 2, true, LocalDate.now(), LocalDate.now(), 1, 1), false,
             "Wszystkie"
         ).blockingGet()
         assertEquals(1, stats.size)

app/src/androidTest/java/io/github/wulkanowy/data/repositories/luckynumber/LuckyNumberLocalTest.kt

@@ -36,7 +36,7 @@ class LuckyNumberLocalTest {
     fun saveAndReadTest() {
         luckyNumberLocal.saveLuckyNumber(LuckyNumber(1, LocalDate.of(2019, 1, 20), 14))
 
-        val luckyNumber = luckyNumberLocal.getLuckyNumber(Semester(1, 1, "", 1, 3, true, 1, 1),
+        val luckyNumber = luckyNumberLocal.getLuckyNumber(Semester(1, 1, "", 1, 3, 2019, true, LocalDate.now(), LocalDate.now(), 1, 1),
             LocalDate.of(2019, 1, 20)
         ).blockingGet()
 

app/src/androidTest/java/io/github/wulkanowy/data/repositories/recipient/RecipientLocalTest.kt

@@ -42,7 +42,7 @@ class RecipientLocalTest {
         ))
 
         val recipients = recipientLocal.getRecipients(
-            Student("fakelog.cf", "AUTO", "", "", "", 1, "", "", "", 1, true, LocalDateTime.now()),
+            Student("fakelog.cf", "AUTO", "", "", "", 1, "", "", "", "", 1, true, LocalDateTime.now()),
             2,
             ReportingUnit(1, 4, "", 0, "", emptyList())
         ).blockingGet()

app/src/androidTest/java/io/github/wulkanowy/data/repositories/student/StudentLocalTest.kt

@@ -39,7 +39,7 @@ class StudentLocalTest {
 
     @Test
     fun saveAndReadTest() {
-        studentLocal.saveStudent(Student(email = "test", password = "test123", schoolSymbol = "23", endpoint = "fakelog.cf", loginType = "AUTO", isCurrent = true, studentName = "", schoolName = "", studentId = 0, classId = 1, symbol = "", registrationDate = now()))
+        studentLocal.saveStudents(listOf(Student(email = "test", password = "test123", schoolSymbol = "23", endpoint = "fakelog.cf", loginType = "AUTO", isCurrent = true, studentName = "", schoolName = "", studentId = 0, classId = 1, symbol = "", registrationDate = now(), className = "")))
             .blockingGet()
 
         val student = studentLocal.getCurrentStudent(true).blockingGet()

app/src/androidTest/java/io/github/wulkanowy/data/repositories/timetable/TimetableLocalTest.kt

@@ -41,7 +41,7 @@ class TimetableLocalTest {
         ))
 
         val exams = timetableDb.getTimetable(
-            Semester(1, 2, "", 1, 1, true, 1, 1),
+            Semester(1, 2, "", 1, 1, 2019, true, LocalDate.now(), LocalDate.now(), 1, 1),
             LocalDate.of(2018, 9, 10),
             LocalDate.of(2018, 9, 14)
         ).blockingGet()

app/src/main/AndroidManifest.xml

@@ -34,6 +34,7 @@
             android:name=".ui.modules.login.LoginActivity"
             android:configChanges="orientation|screenSize"
             android:label="@string/login_title"
+            android:theme="@style/WulkanowyTheme.NoActionBar"
             android:windowSoftInputMode="adjustResize" />
         <activity
             android:name=".ui.modules.main.MainActivity"
@@ -45,13 +46,31 @@
             android:configChanges="orientation|screenSize"
             android:label="@string/send_message_title"
             android:theme="@style/WulkanowyTheme.NoActionBar" />
+        <activity
+            android:name=".ui.modules.timetablewidget.TimetableWidgetConfigureActivity"
+            android:excludeFromRecents="true"
+            android:noHistory="true"
+            android:theme="@style/WulkanowyTheme.WidgetAccountSwitcher">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_CONFIGURE" />
+            </intent-filter>
+        </activity>
+        <activity
+            android:name=".ui.modules.luckynumberwidget.LuckyNumberWidgetConfigureActivity"
+            android:excludeFromRecents="true"
+            android:noHistory="true"
+            android:theme="@style/WulkanowyTheme.WidgetAccountSwitcher">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_CONFIGURE" />
+            </intent-filter>
+        </activity>
 
         <service
             android:name=".services.widgets.TimetableWidgetService"
             android:permission="android.permission.BIND_REMOTEVIEWS" />
 
         <receiver
-            android:name=".ui.widgets.timetable.TimetableWidgetProvider"
+            android:name=".ui.modules.timetablewidget.TimetableWidgetProvider"
             android:exported="true"
             android:label="@string/timetable_title">
             <intent-filter>
@@ -62,6 +81,17 @@
                 android:resource="@xml/provider_widget_timetable" />
         </receiver>
 
+        <receiver
+            android:name=".ui.modules.luckynumberwidget.LuckyNumberWidgetProvider"
+            android:label="@string/lucky_number_title">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
+            </intent-filter>
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/provider_widget_lucky_number" />
+        </receiver>
+
         <provider
             android:name="androidx.work.impl.WorkManagerInitializer"
             android:authorities="${applicationId}.workmanager-init"

app/src/main/java/io/github/wulkanowy/WulkanowyApp.kt

@@ -1,7 +1,6 @@
 package io.github.wulkanowy
 
 import android.content.Context
-import androidx.appcompat.app.AppCompatDelegate
 import androidx.multidex.MultiDex
 import androidx.work.Configuration
 import androidx.work.WorkManager
@@ -13,24 +12,21 @@ 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.data.repositories.preferences.PreferencesRepository
 import io.github.wulkanowy.di.DaggerAppComponent
 import io.github.wulkanowy.services.sync.SyncWorkerFactory
+import io.github.wulkanowy.utils.ActivityLifecycleLogger
 import io.github.wulkanowy.utils.CrashlyticsTree
 import io.github.wulkanowy.utils.DebugLogTree
 import io.reactivex.exceptions.UndeliverableException
 import io.reactivex.plugins.RxJavaPlugins
 import timber.log.Timber
 import java.io.IOException
-import java.lang.Exception
 import javax.inject.Inject
 
 class WulkanowyApp : DaggerApplication() {
 
-    @Inject
-    lateinit var prefRepository: PreferencesRepository
-
     @Inject
     lateinit var workerFactory: SyncWorkerFactory
 
@@ -42,32 +38,36 @@ class WulkanowyApp : DaggerApplication() {
     override fun onCreate() {
         super.onCreate()
         AndroidThreeTen.init(this)
-        initializeFabric()
-        if (DEBUG) enableDebugLog()
-        AppCompatDelegate.setDefaultNightMode(prefRepository.currentTheme)
         WorkManager.initialize(this, Configuration.Builder().setWorkerFactory(workerFactory).build())
         RxJavaPlugins.setErrorHandler(::onError)
+
+        initCrashlytics()
+        initLogging()
     }
 
-    private fun enableDebugLog() {
+    private fun initLogging() {
+        if (DEBUG) {
             Timber.plant(DebugLogTree())
             FlexibleAdapter.enableLogs(Log.Level.DEBUG)
-    }
+        } else {
-
-    private fun initializeFabric() {
-        Fabric.with(Fabric.Builder(this).kits(
-            Crashlytics.Builder().core(CrashlyticsCore.Builder().disabled(!BuildConfig.CRASHLYTICS_ENABLED).build()).build()
-        ).debuggable(BuildConfig.DEBUG).build())
             Timber.plant(CrashlyticsTree())
         }
+        registerActivityLifecycleCallbacks(ActivityLifecycleLogger())
+    }
 
-    private fun onError(t: Throwable) {
+    private fun initCrashlytics() {
-        if (t is UndeliverableException && t.cause is IOException || t.cause is InterruptedException) {
+        Fabric.with(Fabric.Builder(this).kits(
-            Timber.e(t.cause, "An undeliverable error occurred")
+            Crashlytics.Builder().core(CrashlyticsCore.Builder().disabled(!CRASHLYTICS_ENABLED).build()).build()
-        } else throw t
+        ).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")
+        } else throw error
     }
 
     override fun applicationInjector(): AndroidInjector<out DaggerApplication> {
-        return DaggerAppComponent.builder().create(this)
+        return DaggerAppComponent.factory().create(this)
     }
 }

app/src/main/java/io/github/wulkanowy/data/db/AppDatabase.kt

@@ -43,6 +43,7 @@ import io.github.wulkanowy.data.db.entities.Timetable
 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.Migration2
 import io.github.wulkanowy.data.db.migrations.Migration3
 import io.github.wulkanowy.data.db.migrations.Migration4
@@ -81,7 +82,7 @@ import javax.inject.Singleton
 abstract class AppDatabase : RoomDatabase() {
 
     companion object {
-        const val VERSION_SCHEMA = 12
+        const val VERSION_SCHEMA = 13
 
         fun newInstance(context: Context): AppDatabase {
             return Room.databaseBuilder(context, AppDatabase::class.java, "wulkanowy_database")
@@ -99,7 +100,8 @@ abstract class AppDatabase : RoomDatabase() {
                     Migration9(),
                     Migration10(),
                     Migration11(),
-                    Migration12()
+                    Migration12(),
+                    Migration13()
                 )
                 .build()
         }

app/src/main/java/io/github/wulkanowy/data/db/SharedPrefHelper.kt

@@ -6,18 +6,16 @@ import javax.inject.Inject
 import javax.inject.Singleton
 
 @Singleton
+@SuppressLint("ApplySharedPref")
 class SharedPrefHelper @Inject constructor(private val sharedPref: SharedPreferences) {
 
-    @SuppressLint("ApplySharedPref")
     fun putLong(key: String, value: Long, sync: Boolean = false) {
         sharedPref.edit().putLong(key, value).apply {
             if (sync) commit() else apply()
         }
     }
 
-    fun getLong(key: String, defaultValue: Long): Long {
+    fun getLong(key: String, defaultValue: Long) = sharedPref.getLong(key, defaultValue)
-        return sharedPref.getLong(key, defaultValue)
-    }
 
     fun delete(key: String) {
         sharedPref.edit().remove(key).apply()

app/src/main/java/io/github/wulkanowy/data/db/dao/StudentDao.kt

@@ -14,7 +14,7 @@ import javax.inject.Singleton
 interface StudentDao {
 
     @Insert(onConflict = ABORT)
-    fun insert(student: Student): Long
+    fun insertAll(student: List<Student>): List<Long>
 
     @Delete
     fun delete(student: Student)

app/src/main/java/io/github/wulkanowy/data/db/entities/Semester.kt

@@ -4,6 +4,7 @@ import androidx.room.ColumnInfo
 import androidx.room.Entity
 import androidx.room.Index
 import androidx.room.PrimaryKey
+import org.threeten.bp.LocalDate
 
 @Entity(tableName = "Semesters", indices = [Index(value = ["student_id", "diary_id", "semester_id"], unique = true)])
 data class Semester(
@@ -17,6 +18,9 @@ data class Semester(
     @ColumnInfo(name = "diary_name")
     val diaryName: String,
 
+    @ColumnInfo(name = "school_year")
+    val schoolYear: Int,
+
     @ColumnInfo(name = "semester_id")
     val semesterId: Int,
 
@@ -26,6 +30,10 @@ data class Semester(
     @ColumnInfo(name = "is_current")
     val isCurrent: Boolean,
 
+    val start: LocalDate,
+
+    val end: LocalDate,
+
     @ColumnInfo(name = "class_id")
     val classId: Int,
 

app/src/main/java/io/github/wulkanowy/data/db/entities/Student.kt

@@ -32,6 +32,9 @@ data class Student(
     @ColumnInfo(name = "school_name")
     val schoolName: String,
 
+    @ColumnInfo(name = "class_name")
+    val className: String,
+
     @ColumnInfo(name = "class_id")
     val classId: Int,
 

app/src/main/java/io/github/wulkanowy/data/db/migrations/Migration11.kt

@@ -8,7 +8,7 @@ class Migration11 : Migration(10, 11) {
     override fun migrate(database: SupportSQLiteDatabase) {
         database.execSQL("""
             CREATE TABLE IF NOT EXISTS Grades_temp (
-                id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
+                id INTEGER PRIMARY KEY NOT NULL,
                 is_read INTEGER NOT NULL,
                 is_notified INTEGER NOT NULL,
                 semester_id INTEGER NOT NULL,

app/src/main/java/io/github/wulkanowy/data/db/migrations/Migration13.kt

@@ -0,0 +1,64 @@
+package io.github.wulkanowy.data.db.migrations
+
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
+
+class Migration13 : Migration(12, 13) {
+
+    override fun migrate(database: SupportSQLiteDatabase) {
+        addClassNameToStudents(database, getStudentsIds(database))
+        updateSemestersTable(database)
+        markAtLeastAndOnlyOneSemesterAtCurrent(database, getStudentsAndClassIds(database))
+        clearMessagesTable(database)
+    }
+
+    private fun addClassNameToStudents(database: SupportSQLiteDatabase, students: List<Pair<Int, String>>) {
+        database.execSQL("ALTER TABLE Students ADD COLUMN class_name TEXT DEFAULT \"\" NOT NULL")
+
+        students.forEach { (id, name) ->
+            val schoolName = name.substringAfter(" - ")
+            val className = name.substringBefore(" - ", "").replace("Klasa ", "")
+            database.execSQL("UPDATE Students SET class_name = '$className' WHERE id = '$id'")
+            database.execSQL("UPDATE Students SET school_name = '$schoolName' WHERE id = '$id'")
+        }
+    }
+
+    private fun getStudentsIds(database: SupportSQLiteDatabase): MutableList<Pair<Int, String>> {
+        val students = mutableListOf<Pair<Int, String>>()
+        val studentsCursor = database.query("SELECT id, school_name FROM Students")
+        if (studentsCursor.moveToFirst()) {
+            do {
+                students.add(studentsCursor.getInt(0) to studentsCursor.getString(1))
+            } while (studentsCursor.moveToNext())
+        }
+        return students
+    }
+
+    private fun updateSemestersTable(database: SupportSQLiteDatabase) {
+        database.execSQL("ALTER TABLE Semesters ADD COLUMN school_year INTEGER DEFAULT 1970 NOT NULL")
+        database.execSQL("ALTER TABLE Semesters ADD COLUMN start INTEGER DEFAULT 0 NOT NULL")
+        database.execSQL("ALTER TABLE Semesters ADD COLUMN `end` INTEGER DEFAULT 0 NOT NULL")
+    }
+
+    private fun getStudentsAndClassIds(database: SupportSQLiteDatabase): List<Pair<Int, Int>> {
+        val students = mutableListOf<Pair<Int, Int>>()
+        val studentsCursor = database.query("SELECT student_id, class_id FROM Students")
+        if (studentsCursor.moveToFirst()) {
+            do {
+                students.add(studentsCursor.getInt(0) to studentsCursor.getInt(1))
+            } while (studentsCursor.moveToNext())
+        }
+        return students
+    }
+
+    private fun markAtLeastAndOnlyOneSemesterAtCurrent(database: SupportSQLiteDatabase, students: List<Pair<Int, Int>>) {
+        students.forEach { (studentId, classId) ->
+            database.execSQL("UPDATE Semesters SET is_current = 0 WHERE student_id = '$studentId' AND class_id = '$classId'")
+            database.execSQL("UPDATE Semesters SET is_current = 1 WHERE id = (SELECT id FROM Semesters WHERE student_id = '$studentId' AND class_id = '$classId' ORDER BY semester_id DESC)")
+        }
+    }
+
+    private fun clearMessagesTable(database: SupportSQLiteDatabase) {
+        database.execSQL("DELETE FROM Messages")
+    }
+}

app/src/main/java/io/github/wulkanowy/data/repositories/attendance/AttendanceRepository.kt

@@ -6,6 +6,7 @@ import io.github.wulkanowy.data.db.entities.Attendance
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.utils.friday
 import io.github.wulkanowy.utils.monday
+import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Single
 import org.threeten.bp.LocalDate
 import java.net.UnknownHostException
@@ -31,8 +32,8 @@ class AttendanceRepository @Inject constructor(
                         local.getAttendance(semester, dates.first, dates.second)
                             .toSingle(emptyList())
                             .doOnSuccess { oldAttendance ->
-                                local.deleteAttendance(oldAttendance - newAttendance)
+                                local.deleteAttendance(oldAttendance.uniqueSubtract(newAttendance))
-                                local.saveAttendance(newAttendance - oldAttendance)
+                                local.saveAttendance(newAttendance.uniqueSubtract(oldAttendance))
                             }
                     }.flatMap {
                         local.getAttendance(semester, dates.first, dates.second)

app/src/main/java/io/github/wulkanowy/data/repositories/attendancesummary/AttendanceSummaryRepository.kt

@@ -4,6 +4,7 @@ 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.AttendanceSummary
 import io.github.wulkanowy.data.db.entities.Semester
+import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Single
 import java.net.UnknownHostException
 import javax.inject.Inject
@@ -25,8 +26,8 @@ class AttendanceSummaryRepository @Inject constructor(
                 }.flatMap { new ->
                     local.getAttendanceSummary(semester, subjectId).toSingle(emptyList())
                         .doOnSuccess { old ->
-                            local.deleteAttendanceSummary(old - new)
+                            local.deleteAttendanceSummary(old.uniqueSubtract(new))
-                            local.saveAttendanceSummary(new - old)
+                            local.saveAttendanceSummary(new.uniqueSubtract(old))
                         }
                 }.flatMap { local.getAttendanceSummary(semester, subjectId).toSingle(emptyList()) })
     }

app/src/main/java/io/github/wulkanowy/data/repositories/completedlessons/CompletedLessonsRepository.kt

@@ -6,6 +6,7 @@ import io.github.wulkanowy.data.db.entities.CompletedLesson
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.utils.friday
 import io.github.wulkanowy.utils.monday
+import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Single
 import org.threeten.bp.LocalDate
 import java.net.UnknownHostException
@@ -31,8 +32,8 @@ class CompletedLessonsRepository @Inject constructor(
                             local.getCompletedLessons(semester, dates.first, dates.second)
                                 .toSingle(emptyList())
                                 .doOnSuccess { old ->
-                                    local.deleteCompleteLessons(old - new)
+                                    local.deleteCompleteLessons(old.uniqueSubtract(new))
-                                    local.saveCompletedLessons(new - old)
+                                    local.saveCompletedLessons(new.uniqueSubtract(old))
                                 }
                         }.flatMap {
                             local.getCompletedLessons(semester, dates.first, dates.second)

app/src/main/java/io/github/wulkanowy/data/repositories/exam/ExamRepository.kt

@@ -6,6 +6,7 @@ import io.github.wulkanowy.data.db.entities.Exam
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.utils.friday
 import io.github.wulkanowy.utils.monday
+import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Single
 import org.threeten.bp.LocalDate
 import java.net.UnknownHostException
@@ -27,12 +28,12 @@ class ExamRepository @Inject constructor(
                         .flatMap {
                             if (it) remote.getExams(semester, dates.first, dates.second)
                             else Single.error(UnknownHostException())
-                        }.flatMap { newExams ->
+                        }.flatMap { new ->
                             local.getExams(semester, dates.first, dates.second)
                                 .toSingle(emptyList())
-                                .doOnSuccess { oldExams ->
+                                .doOnSuccess { old ->
-                                    local.deleteExams(oldExams - newExams)
+                                    local.deleteExams(old.uniqueSubtract(new))
-                                    local.saveExams(newExams - oldExams)
+                                    local.saveExams(new.uniqueSubtract(old))
                                 }
                         }.flatMap {
                             local.getExams(semester, dates.first, dates.second)

app/src/main/java/io/github/wulkanowy/data/repositories/grade/GradeRepository.kt

@@ -5,6 +5,7 @@ import com.github.pwittchen.reactivenetwork.library.rx2.internet.observing.Inter
 import io.github.wulkanowy.data.db.entities.Grade
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
+import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Completable
 import io.reactivex.Single
 import java.net.UnknownHostException
@@ -24,13 +25,12 @@ class GradeRepository @Inject constructor(
                 .flatMap {
                     if (it) remote.getGrades(semester)
                     else Single.error(UnknownHostException())
-                }.flatMap { newGrades ->
+                }.flatMap { new ->
                     local.getGrades(semester).toSingle(emptyList())
-                        .doOnSuccess { oldGrades ->
+                        .doOnSuccess { old ->
-                            val notifyBreakDate = oldGrades.maxBy { it.date }?.date
+                            val notifyBreakDate = old.maxBy { it.date }?.date ?: student.registrationDate.toLocalDate()
-                                ?: student.registrationDate.toLocalDate()
+                            local.deleteGrades(old.uniqueSubtract(new))
-                            local.deleteGrades(oldGrades - newGrades)
+                            local.saveGrades(new.uniqueSubtract(old)
-                            local.saveGrades((newGrades - oldGrades)
                                 .onEach {
                                     if (it.date >= notifyBreakDate) it.apply {
                                         isRead = false

app/src/main/java/io/github/wulkanowy/data/repositories/gradessummary/GradeSummaryRepository.kt

@@ -4,6 +4,7 @@ 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.GradeSummary
 import io.github.wulkanowy.data.db.entities.Semester
+import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Single
 import java.net.UnknownHostException
 import javax.inject.Inject
@@ -22,11 +23,11 @@ class GradeSummaryRepository @Inject constructor(
                 .flatMap {
                     if (it) remote.getGradeSummary(semester)
                     else Single.error(UnknownHostException())
-                }.flatMap { newGradesSummary ->
+                }.flatMap { new ->
                     local.getGradesSummary(semester).toSingle(emptyList())
-                        .doOnSuccess { oldGradesSummary ->
+                        .doOnSuccess { old ->
-                            local.deleteGradesSummary(oldGradesSummary - newGradesSummary)
+                            local.deleteGradesSummary(old.uniqueSubtract(new))
-                            local.saveGradesSummary(newGradesSummary - oldGradesSummary)
+                            local.saveGradesSummary(new.uniqueSubtract(old))
                         }
                 }.flatMap { local.getGradesSummary(semester).toSingle(emptyList()) })
     }

app/src/main/java/io/github/wulkanowy/data/repositories/gradestatistics/GradeStatisticsRepository.kt

@@ -4,6 +4,7 @@ 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.GradeStatistics
 import io.github.wulkanowy.data.db.entities.Semester
+import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Single
 import java.net.UnknownHostException
 import javax.inject.Inject
@@ -22,11 +23,11 @@ class GradeStatisticsRepository @Inject constructor(
                 .flatMap {
                     if (it) remote.getGradeStatistics(semester, isSemester)
                     else Single.error(UnknownHostException())
-                }.flatMap { newGradesStats ->
+                }.flatMap { new ->
                     local.getGradesStatistics(semester, isSemester).toSingle(emptyList())
-                        .doOnSuccess { oldGradesStats ->
+                        .doOnSuccess { old ->
-                            local.deleteGradesStatistics(oldGradesStats - newGradesStats)
+                            local.deleteGradesStatistics(old.uniqueSubtract(new))
-                            local.saveGradesStatistics(newGradesStats - oldGradesStats)
+                            local.saveGradesStatistics(new.uniqueSubtract(old))
                         }
                 }.flatMap { local.getGradesStatistics(semester, isSemester, subjectName).toSingle(emptyList()) })
     }

app/src/main/java/io/github/wulkanowy/data/repositories/homework/HomeworkRepository.kt

@@ -6,6 +6,7 @@ import io.github.wulkanowy.data.db.entities.Homework
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.utils.friday
 import io.github.wulkanowy.utils.monday
+import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Single
 import org.threeten.bp.LocalDate
 import java.net.UnknownHostException
@@ -26,11 +27,11 @@ class HomeworkRepository @Inject constructor(
                     .flatMap {
                         if (it) remote.getHomework(semester, monday, friday)
                         else Single.error(UnknownHostException())
-                    }.flatMap { newGrades ->
+                    }.flatMap { new ->
                         local.getHomework(semester, monday, friday).toSingle(emptyList())
-                            .doOnSuccess { oldGrades ->
+                            .doOnSuccess { old ->
-                                local.deleteHomework(oldGrades - newGrades)
+                                local.deleteHomework(old.uniqueSubtract(new))
-                                local.saveHomework(newGrades - oldGrades)
+                                local.saveHomework(new.uniqueSubtract(old))
                             }
                     }.flatMap { local.getHomework(semester, monday, friday).toSingle(emptyList()) })
         }

app/src/main/java/io/github/wulkanowy/data/repositories/message/MessageLocal.kt

@@ -24,13 +24,13 @@ class MessageLocal @Inject constructor(private val messagesDb: MessagesDao) {
     }
 
     fun getMessage(student: Student, id: Int): Maybe<Message> {
-        return messagesDb.load(student.studentId, id)
+        return messagesDb.load(student.id.toInt(), id)
     }
 
     fun getMessages(student: Student, folder: MessageFolder): Maybe<List<Message>> {
         return when (folder) {
-            TRASHED -> messagesDb.loadDeleted(student.studentId)
+            TRASHED -> messagesDb.loadDeleted(student.id.toInt())
-            else -> messagesDb.loadAll(student.studentId, folder.id)
+            else -> messagesDb.loadAll(student.id.toInt(), folder.id)
         }.filter { it.isNotEmpty() }
     }
 }

app/src/main/java/io/github/wulkanowy/data/repositories/message/MessageRemote.kt

@@ -5,6 +5,7 @@ import io.github.wulkanowy.api.messages.Folder
 import io.github.wulkanowy.api.messages.SentMessage
 import io.github.wulkanowy.data.db.entities.Message
 import io.github.wulkanowy.data.db.entities.Recipient
+import io.github.wulkanowy.data.db.entities.Student
 import io.github.wulkanowy.utils.toLocalDateTime
 import io.reactivex.Single
 import org.threeten.bp.LocalDateTime.now
@@ -16,11 +17,11 @@ import io.github.wulkanowy.api.messages.Recipient as ApiRecipient
 @Singleton
 class MessageRemote @Inject constructor(private val api: Api) {
 
-    fun getMessages(studentId: Int, folder: MessageFolder): Single<List<Message>> {
+    fun getMessages(student: Student, folder: MessageFolder): Single<List<Message>> {
         return api.getMessages(Folder.valueOf(folder.name)).map { messages ->
             messages.map {
                 Message(
-                    studentId = studentId,
+                    studentId = student.id.toInt(),
                     realId = it.id ?: 0,
                     messageId = it.messageId ?: 0,
                     sender = it.sender.orEmpty(),
@@ -58,4 +59,8 @@ class MessageRemote @Inject constructor(private val api: Api) {
             }
         )
     }
+
+    fun deleteMessage(message: Message): Single<Boolean> {
+        return api.deleteMessages(listOf(Pair(message.realId, message.folderId)))
+    }
 }

app/src/main/java/io/github/wulkanowy/data/repositories/message/MessageRepository.kt

@@ -8,7 +8,9 @@ import io.github.wulkanowy.data.db.entities.Message
 import io.github.wulkanowy.data.db.entities.Recipient
 import io.github.wulkanowy.data.db.entities.Student
 import io.github.wulkanowy.data.repositories.message.MessageFolder.RECEIVED
+import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Completable
+import io.reactivex.Maybe
 import io.reactivex.Single
 import java.net.UnknownHostException
 import javax.inject.Inject
@@ -28,13 +30,13 @@ class MessageRepository @Inject constructor(
                 local.getMessages(student, folder).filter { !forceRefresh }
                     .switchIfEmpty(ReactiveNetwork.checkInternetConnectivity(settings)
                         .flatMap {
-                            if (it) remote.getMessages(student.studentId, folder)
+                            if (it) remote.getMessages(student, folder)
                             else Single.error(UnknownHostException())
                         }.flatMap { new ->
                             local.getMessages(student, folder).toSingle(emptyList())
                                 .doOnSuccess { old ->
-                                    local.deleteMessages(old - new)
+                                    local.deleteMessages(old.uniqueSubtract(new))
-                                    local.saveMessages((new - old)
+                                    local.saveMessages(new.uniqueSubtract(old)
                                         .onEach {
                                             it.isNotified = !notify
                                         })
@@ -89,4 +91,20 @@ class MessageRepository @Inject constructor(
                 else Single.error(UnknownHostException())
             }
     }
+
+    fun deleteMessage(message: Message): Maybe<Boolean> {
+        return ReactiveNetwork.checkInternetConnectivity(settings)
+            .flatMap {
+                if (it) remote.deleteMessage(message)
+                else Single.error(UnknownHostException())
+            }
+            .filter { it }
+            .doOnSuccess {
+                if (!message.removed) local.updateMessages(listOf(message.copy(removed = true).apply {
+                    id = message.id
+                    content = message.content
+                }))
+                else local.deleteMessages(listOf(message))
+            }
+    }
 }

app/src/main/java/io/github/wulkanowy/data/repositories/note/NoteRepository.kt

@@ -5,6 +5,7 @@ import com.github.pwittchen.reactivenetwork.library.rx2.internet.observing.Inter
 import io.github.wulkanowy.data.db.entities.Note
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
+import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Completable
 import io.reactivex.Single
 import java.net.UnknownHostException
@@ -27,8 +28,8 @@ class NoteRepository @Inject constructor(
                 }.flatMap { new ->
                     local.getNotes(student).toSingle(emptyList())
                         .doOnSuccess { old ->
-                            local.deleteNotes(old - new)
+                            local.deleteNotes(old.uniqueSubtract(new))
-                            local.saveNotes((new - old)
+                            local.saveNotes(new.uniqueSubtract(old)
                                 .onEach {
                                     if (it.date >= student.registrationDate.toLocalDate()) it.apply {
                                         isRead = false

app/src/main/java/io/github/wulkanowy/data/repositories/preferences/PreferencesRepository.kt

@@ -17,12 +17,15 @@ class PreferencesRepository @Inject constructor(
     val isShowPresent: Boolean
         get() = sharedPref.getBoolean(context.getString(R.string.pref_key_attendance_present), true)
 
+    val gradeAverageMode: String
+        get() = sharedPref.getString(context.getString(R.string.pref_key_grade_average_mode), "only_one_semester") ?: "only_one_semester"
+
     val isGradeExpandable: Boolean
         get() = !sharedPref.getBoolean(context.getString(R.string.pref_key_expand_grade), false)
 
-    val currentThemeKey: String = context.getString(R.string.pref_key_theme)
+    val appThemeKey: String = context.getString(R.string.pref_key_app_theme)
-    val currentTheme: Int
+    val appTheme: String
-        get() = sharedPref.getString(currentThemeKey, "1")?.toIntOrNull() ?: 1
+        get() = sharedPref.getString(appThemeKey, "light") ?: "light"
 
     val gradeColorTheme: String
         get() = sharedPref.getString(context.getString(R.string.pref_key_grade_color_scheme), "vulcan") ?: "vulcan"
@@ -50,8 +53,7 @@ class PreferencesRepository @Inject constructor(
         get() = sharedPref.getString(context.getString(R.string.pref_key_grade_modifier_plus), "0.0")?.toDouble() ?: 0.0
 
     val gradeMinusModifier: Double
-        get() = sharedPref.getString(context.getString(R.string.pref_key_grade_modifier_minus), "0.0")?.toDouble()
+        get() = sharedPref.getString(context.getString(R.string.pref_key_grade_modifier_minus), "0.0")?.toDouble() ?: 0.0
-            ?: 0.0
 
     val fillMessageContent: Boolean
         get() = sharedPref.getBoolean(context.getString(R.string.pref_key_fill_message_content), true)

app/src/main/java/io/github/wulkanowy/data/repositories/recipient/RecipientRepository.kt

@@ -7,6 +7,7 @@ import io.github.wulkanowy.data.db.entities.Message
 import io.github.wulkanowy.data.db.entities.Recipient
 import io.github.wulkanowy.data.db.entities.ReportingUnit
 import io.github.wulkanowy.data.db.entities.Student
+import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Single
 import java.net.UnknownHostException
 import javax.inject.Inject
@@ -31,8 +32,8 @@ class RecipientRepository @Inject constructor(
                         }.flatMap { new ->
                             local.getRecipients(student, role, unit).toSingle(emptyList())
                                 .doOnSuccess { old ->
-                                    local.deleteRecipients(old - new)
+                                    local.deleteRecipients(old.uniqueSubtract(new))
-                                    local.saveRecipients(new - old)
+                                    local.saveRecipients(new.uniqueSubtract(old))
                                 }
                         }.flatMap {
                             local.getRecipients(student, role, unit).toSingle(emptyList())

app/src/main/java/io/github/wulkanowy/data/repositories/reportingunit/ReportingUnitRepository.kt

@@ -5,6 +5,7 @@ import com.github.pwittchen.reactivenetwork.library.rx2.internet.observing.Inter
 import io.github.wulkanowy.data.ApiHelper
 import io.github.wulkanowy.data.db.entities.ReportingUnit
 import io.github.wulkanowy.data.db.entities.Student
+import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Maybe
 import io.reactivex.Single
 import java.net.UnknownHostException
@@ -30,8 +31,8 @@ class ReportingUnitRepository @Inject constructor(
                         }.flatMap { new ->
                             local.getReportingUnits(student).toSingle(emptyList())
                                 .doOnSuccess { old ->
-                                    local.deleteReportingUnits(old - new)
+                                    local.deleteReportingUnits(old.uniqueSubtract(new))
-                                    local.saveReportingUnits(new - old)
+                                    local.saveReportingUnits(new.uniqueSubtract(old))
                                 }
                         }.flatMap { local.getReportingUnits(student).toSingle(emptyList()) }
                     )

app/src/main/java/io/github/wulkanowy/data/repositories/semester/SemesterRemote.kt

@@ -17,9 +17,12 @@ class SemesterRemote @Inject constructor(private val api: Api) {
                     studentId = student.studentId,
                     diaryId = semester.diaryId,
                     diaryName = semester.diaryName,
+                    schoolYear = semester.schoolYear,
                     semesterId = semester.semesterId,
                     semesterName = semester.semesterNumber,
                     isCurrent = semester.current,
+                    start = semester.start,
+                    end = semester.end,
                     classId = semester.classId,
                     unitId = semester.unitId
                 )

app/src/main/java/io/github/wulkanowy/data/repositories/semester/SemesterRepository.kt

@@ -5,6 +5,7 @@ import com.github.pwittchen.reactivenetwork.library.rx2.internet.observing.Inter
 import io.github.wulkanowy.data.ApiHelper
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
+import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Maybe
 import io.reactivex.Single
 import timber.log.Timber
@@ -31,8 +32,8 @@ class SemesterRepository @Inject constructor(
                     if (currentSemesters.size == 1) {
                         local.getSemesters(student).toSingle(emptyList())
                             .doOnSuccess { old ->
-                                local.deleteSemesters(old - new)
+                                local.deleteSemesters(old.uniqueSubtract(new))
-                                local.saveSemesters(new - old)
+                                local.saveSemesters(new.uniqueSubtract(old))
                             }
                     } else {
                         Timber.i("Current semesters list:\n${currentSemesters.joinToString(separator = "\n")}")

app/src/main/java/io/github/wulkanowy/data/repositories/student/StudentLocal.kt

@@ -17,8 +17,8 @@ class StudentLocal @Inject constructor(
     private val context: Context
 ) {
 
-    fun saveStudent(student: Student): Single<Long> {
+    fun saveStudents(students: List<Student>): Single<List<Long>> {
-        return Single.fromCallable { studentDb.insert(student.copy(password = encrypt(student.password, context))) }
+        return Single.fromCallable { studentDb.insertAll(students.map { it.copy(password = encrypt(it.password, context)) }) }
     }
 
     fun getStudents(decryptPass: Boolean): Maybe<List<Student>> {

app/src/main/java/io/github/wulkanowy/data/repositories/student/StudentRemote.kt

@@ -21,6 +21,7 @@ class StudentRemote @Inject constructor(private val api: Api) {
                     studentName = student.studentName,
                     schoolSymbol = student.schoolSymbol,
                     schoolName = student.schoolName,
+                    className = student.className,
                     classId = student.classId,
                     endpoint = endpoint,
                     loginType = student.loginType.name,

app/src/main/java/io/github/wulkanowy/data/repositories/student/StudentRepository.kt

@@ -41,8 +41,8 @@ class StudentRepository @Inject constructor(
             .toSingle()
     }
 
-    fun saveStudent(student: Student): Single<Long> {
+    fun saveStudents(students: List<Student>): Single<List<Long>> {
-        return local.saveStudent(student)
+        return local.saveStudents(students)
     }
 
     fun switchStudent(student: Student): Completable {

app/src/main/java/io/github/wulkanowy/data/repositories/subject/SubjectRepository.kt

@@ -4,6 +4,7 @@ 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.Semester
 import io.github.wulkanowy.data.db.entities.Subject
+import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Single
 import java.net.UnknownHostException
 import javax.inject.Inject
@@ -26,8 +27,8 @@ class SubjectRepository @Inject constructor(
                     local.getSubjects(semester)
                         .toSingle(emptyList())
                         .doOnSuccess { old ->
-                            local.deleteSubjects(old - new)
+                            local.deleteSubjects(old.uniqueSubtract(new))
-                            local.saveSubjects(new - old)
+                            local.saveSubjects(new.uniqueSubtract(old))
                         }
                 }.flatMap {
                     local.getSubjects(semester).toSingle(emptyList())

app/src/main/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepository.kt

@@ -6,6 +6,7 @@ import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Timetable
 import io.github.wulkanowy.utils.friday
 import io.github.wulkanowy.utils.monday
+import io.github.wulkanowy.utils.uniqueSubtract
 import io.reactivex.Single
 import org.threeten.bp.LocalDate
 import java.net.UnknownHostException
@@ -25,14 +26,14 @@ class TimetableRepository @Inject constructor(
                 .switchIfEmpty(ReactiveNetwork.checkInternetConnectivity(settings).flatMap {
                     if (it) remote.getTimetable(semester, monday, friday)
                     else Single.error(UnknownHostException())
-                }.flatMap { newTimetable ->
+                }.flatMap { new ->
                     local.getTimetable(semester, monday, friday)
                         .toSingle(emptyList())
-                        .doOnSuccess { oldTimetable ->
+                        .doOnSuccess { old ->
-                            local.deleteTimetable(oldTimetable - newTimetable)
+                            local.deleteTimetable(old.uniqueSubtract(new))
-                            local.saveTimetable((newTimetable - oldTimetable).map { item ->
+                            local.saveTimetable(new.uniqueSubtract(old).map { item ->
                                 item.apply {
-                                    oldTimetable.singleOrNull { this.start == it.start }?.let {
+                                    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

app/src/main/java/io/github/wulkanowy/di/AppComponent.kt

@@ -17,6 +17,6 @@ import javax.inject.Singleton
     BuilderModule::class])
 interface AppComponent : AndroidInjector<WulkanowyApp> {
 
-    @Component.Builder
+    @Component.Factory
-    abstract class Builder : AndroidInjector.Builder<WulkanowyApp>()
+    interface Factory : AndroidInjector.Factory<WulkanowyApp>
 }

app/src/main/java/io/github/wulkanowy/di/AppModule.kt

@@ -9,7 +9,6 @@ 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.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
 import javax.inject.Named
 import javax.inject.Singleton
@@ -30,11 +29,11 @@ internal class AppModule {
 
     @Singleton
     @Provides
-    fun provideFirebaseAnalyticsHelper(context: Context) = FirebaseAnalyticsHelper(FirebaseAnalytics.getInstance(context))
+    fun provideFirebaseAnalytics(context: Context) = FirebaseAnalytics.getInstance(context)
 
     @Singleton
     @Provides
-    fun provideAppWidgetManager(context: Context) = AppWidgetManager.getInstance(context)
+    fun provideAppWidgetManager(context: Context): AppWidgetManager = AppWidgetManager.getInstance(context)
 
     @Singleton
     @Named("isDebug")

app/src/main/java/io/github/wulkanowy/di/BuilderModule.kt

@@ -5,11 +5,14 @@ import dagger.android.ContributesAndroidInjector
 import io.github.wulkanowy.di.scopes.PerActivity
 import io.github.wulkanowy.ui.modules.login.LoginActivity
 import io.github.wulkanowy.ui.modules.login.LoginModule
+import io.github.wulkanowy.ui.modules.luckynumberwidget.LuckyNumberWidgetConfigureActivity
 import io.github.wulkanowy.ui.modules.main.MainActivity
 import io.github.wulkanowy.ui.modules.main.MainModule
 import io.github.wulkanowy.ui.modules.message.send.SendMessageActivity
 import io.github.wulkanowy.ui.modules.splash.SplashActivity
-import io.github.wulkanowy.ui.widgets.timetable.TimetableWidgetProvider
+import io.github.wulkanowy.ui.modules.luckynumberwidget.LuckyNumberWidgetProvider
+import io.github.wulkanowy.ui.modules.timetablewidget.TimetableWidgetConfigureActivity
+import io.github.wulkanowy.ui.modules.timetablewidget.TimetableWidgetProvider
 
 @Module
 internal abstract class BuilderModule {
@@ -29,6 +32,15 @@ internal abstract class BuilderModule {
     @ContributesAndroidInjector
     abstract fun bindMessageSendActivity(): SendMessageActivity
 
+    @ContributesAndroidInjector
+    abstract fun bindTimetableWidgetAccountActivity(): TimetableWidgetConfigureActivity
+
     @ContributesAndroidInjector
     abstract fun bindTimetableWidgetProvider(): TimetableWidgetProvider
+
+    @ContributesAndroidInjector
+    abstract fun bindLuckyNumberWidgetAccountActivity(): LuckyNumberWidgetConfigureActivity
+
+    @ContributesAndroidInjector
+    abstract fun bindLuckyNumberWidgetProvider(): LuckyNumberWidgetProvider
 }

app/src/main/java/io/github/wulkanowy/services/sync/works/GradeWork.kt

@@ -15,7 +15,7 @@ import io.github.wulkanowy.data.repositories.grade.GradeRepository
 import io.github.wulkanowy.data.repositories.preferences.PreferencesRepository
 import io.github.wulkanowy.services.sync.channels.NewEntriesChannel
 import io.github.wulkanowy.ui.modules.main.MainActivity
-import io.github.wulkanowy.ui.modules.main.MainActivity.Companion.EXTRA_START_MENU_INDEX
+import io.github.wulkanowy.ui.modules.main.MainView.MenuView
 import io.github.wulkanowy.utils.getCompatColor
 import io.reactivex.Completable
 import javax.inject.Inject
@@ -47,8 +47,8 @@ class GradeWork @Inject constructor(
             .setDefaults(DEFAULT_ALL)
             .setColor(context.getCompatColor(R.color.colorPrimary))
             .setContentIntent(
-                PendingIntent.getActivity(context, 0,
+                PendingIntent.getActivity(context, MenuView.GRADE.id,
-                    MainActivity.getStartIntent(context).putExtra(EXTRA_START_MENU_INDEX, 0), FLAG_UPDATE_CURRENT))
+                    MainActivity.getStartIntent(context, MenuView.GRADE, true), FLAG_UPDATE_CURRENT))
             .setStyle(NotificationCompat.InboxStyle().run {
                 setSummaryText(context.resources.getQuantityString(R.plurals.grade_number_item, grades.size, grades.size))
                 grades.forEach { addLine("${it.subject}: ${it.entry}") }

app/src/main/java/io/github/wulkanowy/services/sync/works/LuckyNumberWork.kt

@@ -15,7 +15,7 @@ import io.github.wulkanowy.data.repositories.luckynumber.LuckyNumberRepository
 import io.github.wulkanowy.data.repositories.preferences.PreferencesRepository
 import io.github.wulkanowy.services.sync.channels.NewEntriesChannel
 import io.github.wulkanowy.ui.modules.main.MainActivity
-import io.github.wulkanowy.ui.modules.main.MainActivity.Companion.EXTRA_START_MENU_INDEX
+import io.github.wulkanowy.ui.modules.main.MainView.MenuView
 import io.github.wulkanowy.utils.getCompatColor
 import io.reactivex.Completable
 import javax.inject.Inject
@@ -47,9 +47,8 @@ class LuckyNumberWork @Inject constructor(
             .setPriority(PRIORITY_HIGH)
             .setColor(context.getCompatColor(R.color.colorPrimary))
             .setContentIntent(
-                PendingIntent.getActivity(context, 0,
+                PendingIntent.getActivity(context, MenuView.MESSAGE.id,
-                    MainActivity.getStartIntent(context).putExtra(EXTRA_START_MENU_INDEX, 4), FLAG_UPDATE_CURRENT)
+                    MainActivity.getStartIntent(context, MenuView.LUCKY_NUMBER, true), FLAG_UPDATE_CURRENT))
-            )
             .build())
     }
 }

app/src/main/java/io/github/wulkanowy/services/sync/works/MessageWork.kt

@@ -16,7 +16,7 @@ import io.github.wulkanowy.data.repositories.message.MessageRepository
 import io.github.wulkanowy.data.repositories.preferences.PreferencesRepository
 import io.github.wulkanowy.services.sync.channels.NewEntriesChannel
 import io.github.wulkanowy.ui.modules.main.MainActivity
-import io.github.wulkanowy.ui.modules.main.MainActivity.Companion.EXTRA_START_MENU_INDEX
+import io.github.wulkanowy.ui.modules.main.MainView.MenuView
 import io.github.wulkanowy.utils.getCompatColor
 import io.reactivex.Completable
 import javax.inject.Inject
@@ -48,8 +48,8 @@ class MessageWork @Inject constructor(
             .setPriority(PRIORITY_HIGH)
             .setColor(context.getCompatColor(R.color.colorPrimary))
             .setContentIntent(
-                PendingIntent.getActivity(context, 0,
+                PendingIntent.getActivity(context, MenuView.MESSAGE.id,
-                    MainActivity.getStartIntent(context).putExtra(EXTRA_START_MENU_INDEX, 4), FLAG_UPDATE_CURRENT)
+                    MainActivity.getStartIntent(context, MenuView.MESSAGE, true), FLAG_UPDATE_CURRENT)
             )
             .setStyle(NotificationCompat.InboxStyle().run {
                 setSummaryText(context.resources.getQuantityString(R.plurals.message_number_item, messages.size, messages.size))

app/src/main/java/io/github/wulkanowy/services/sync/works/NoteWork.kt

@@ -15,7 +15,7 @@ import io.github.wulkanowy.data.repositories.note.NoteRepository
 import io.github.wulkanowy.data.repositories.preferences.PreferencesRepository
 import io.github.wulkanowy.services.sync.channels.NewEntriesChannel
 import io.github.wulkanowy.ui.modules.main.MainActivity
-import io.github.wulkanowy.ui.modules.main.MainActivity.Companion.EXTRA_START_MENU_INDEX
+import io.github.wulkanowy.ui.modules.main.MainView.MenuView
 import io.github.wulkanowy.utils.getCompatColor
 import io.reactivex.Completable
 import javax.inject.Inject
@@ -47,9 +47,8 @@ class NoteWork @Inject constructor(
             .setPriority(PRIORITY_HIGH)
             .setColor(context.getCompatColor(R.color.colorPrimary))
             .setContentIntent(
-                PendingIntent.getActivity(context, 0,
+                PendingIntent.getActivity(context, MenuView.NOTE.id,
-                    MainActivity.getStartIntent(context).putExtra(EXTRA_START_MENU_INDEX, 4), FLAG_UPDATE_CURRENT)
+                    MainActivity.getStartIntent(context, MenuView.NOTE, true), FLAG_UPDATE_CURRENT))
-            )
             .setStyle(NotificationCompat.InboxStyle().run {
                 setSummaryText(context.resources.getQuantityString(R.plurals.note_number_item, notes.size, notes.size))
                 notes.forEach { addLine("${it.teacher}: ${it.category}") }

app/src/main/java/io/github/wulkanowy/services/widgets/TimetableWidgetService.kt

@@ -7,7 +7,7 @@ import io.github.wulkanowy.data.db.SharedPrefHelper
 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.widgets.timetable.TimetableWidgetFactory
+import io.github.wulkanowy.ui.modules.timetablewidget.TimetableWidgetFactory
 import io.github.wulkanowy.utils.SchedulersProvider
 import javax.inject.Inject
 

app/src/main/java/io/github/wulkanowy/ui/base/BaseActivity.kt

@@ -2,33 +2,59 @@ package io.github.wulkanowy.ui.base
 
 import android.os.Bundle
 import android.view.View
+import android.widget.Toast
+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.support.DaggerAppCompatActivity
+import dagger.android.AndroidInjection
+import dagger.android.DispatchingAndroidInjector
+import dagger.android.support.HasSupportFragmentInjector
 import io.github.wulkanowy.R
+import io.github.wulkanowy.utils.FragmentLifecycleLogger
+import javax.inject.Inject
 
-abstract class BaseActivity : DaggerAppCompatActivity(), BaseView {
+abstract class BaseActivity : AppCompatActivity(), BaseView, HasSupportFragmentInjector {
 
-    protected lateinit var messageContainer: View
+    @Inject
+    lateinit var supportFragmentInjector: DispatchingAndroidInjector<Fragment>
+
+    @Inject
+    lateinit var fragmentLifecycleLogger: FragmentLifecycleLogger
+
+    @Inject
+    lateinit var themeManager: ThemeManager
+
+    protected var messageContainer: View? = null
 
     public override fun onCreate(savedInstanceState: Bundle?) {
+        AndroidInjection.inject(this)
+        themeManager.applyTheme(this)
         super.onCreate(savedInstanceState)
+        supportFragmentManager.registerFragmentLifecycleCallbacks(fragmentLifecycleLogger, true)
         AppCompatDelegate.setCompatVectorFromResourcesEnabled(true)
     }
 
     override fun showError(text: String, error: Throwable) {
-        Snackbar.make(messageContainer, text, LENGTH_LONG).setAction(R.string.all_details) {
+        if (messageContainer != null) {
+            Snackbar.make(messageContainer!!, text, LENGTH_LONG)
+                .setAction(R.string.all_details) {
                     ErrorDialog.newInstance(error).show(supportFragmentManager, error.toString())
-        }.show()
+                }
+                .show()
+        } else showMessage(text)
     }
 
     override fun showMessage(text: String) {
-        Snackbar.make(messageContainer, text, LENGTH_LONG).show()
+        if (messageContainer != null) Snackbar.make(messageContainer!!, text, LENGTH_LONG).show()
+        else Toast.makeText(this, text, Toast.LENGTH_LONG).show()
     }
 
     override fun onDestroy() {
         super.onDestroy()
         invalidateOptionsMenu()
     }
+
+    override fun supportFragmentInjector() = supportFragmentInjector
 }

app/src/main/java/io/github/wulkanowy/ui/base/BaseFragment.kt

@@ -2,6 +2,7 @@ package io.github.wulkanowy.ui.base
 
 import android.view.View
 import com.google.android.material.snackbar.Snackbar
+import com.google.android.material.snackbar.Snackbar.LENGTH_LONG
 import dagger.android.support.DaggerFragment
 import io.github.wulkanowy.R
 
@@ -10,16 +11,22 @@ abstract class BaseFragment : DaggerFragment(), BaseView {
     protected var messageContainer: View? = null
 
     override fun showError(text: String, error: Throwable) {
-        if (messageContainer == null) (activity as? BaseActivity)?.showError(text, error)
+        if (messageContainer != null) {
-        else messageContainer?.also {
+            Snackbar.make(messageContainer!!, text, LENGTH_LONG)
-            Snackbar.make(it, text, Snackbar.LENGTH_LONG).setAction(R.string.all_details) {
+                .setAction(R.string.all_details) {
-                ErrorDialog.newInstance(error).show(childFragmentManager, error.toString())
+                    if (isAdded) ErrorDialog.newInstance(error).show(childFragmentManager, error.toString())
-            }.show()
+                }
+                .show()
+        } else {
+            (activity as? BaseActivity)?.showError(text, error)
         }
     }
 
     override fun showMessage(text: String) {
-        if (messageContainer == null) (activity as? BaseActivity)?.showMessage(text)
+        if (messageContainer != null) {
-        else messageContainer?.also { Snackbar.make(it, text, Snackbar.LENGTH_LONG).show() }
+            Snackbar.make(messageContainer!!, text, LENGTH_LONG).show()
+        } else {
+            (activity as? BaseActivity)?.showMessage(text)
+        }
     }
 }

app/src/main/java/io/github/wulkanowy/ui/base/ThemeManager.kt

@@ -0,0 +1,33 @@
+package io.github.wulkanowy.ui.base
+
+import android.content.pm.PackageManager.GET_ACTIVITIES
+import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.app.AppCompatDelegate.MODE_NIGHT_NO
+import androidx.appcompat.app.AppCompatDelegate.MODE_NIGHT_YES
+import io.github.wulkanowy.R
+import io.github.wulkanowy.data.repositories.preferences.PreferencesRepository
+import javax.inject.Inject
+
+class ThemeManager @Inject constructor(private val preferencesRepository: PreferencesRepository) {
+
+    fun applyTheme(activity: AppCompatActivity) {
+        if (isThemeApplicable(activity)) {
+            activity.delegate.apply {
+                when (preferencesRepository.appTheme) {
+                    "light" -> setLocalNightMode(MODE_NIGHT_NO)
+                    "dark" -> setLocalNightMode(MODE_NIGHT_YES)
+                    "black" -> {
+                        setLocalNightMode(MODE_NIGHT_YES)
+                        activity.setTheme(R.style.WulkanowyTheme_Black)
+                    }
+                }
+            }
+        }
+    }
+
+    private fun isThemeApplicable(activity: AppCompatActivity): Boolean {
+        return activity.packageManager.getPackageInfo(activity.packageName, GET_ACTIVITIES)
+            .activities.singleOrNull { it.name == activity::class.java.canonicalName }?.theme
+            .let { it == R.style.WulkanowyTheme_Black || it == R.style.WulkanowyTheme_NoActionBar }
+    }
+}

app/src/main/java/io/github/wulkanowy/ui/modules/about/AboutFragment.kt

@@ -12,6 +12,7 @@ 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.openInternetBrowser
 import io.github.wulkanowy.utils.withOnExtraListener
 import javax.inject.Inject
 
@@ -44,7 +45,7 @@ class AboutFragment : BaseFragment(), AboutView, MainView.TitledView {
                 .withFields(R.string::class.java.fields)
                 .withCheckCachedDetection(false)
                 .withExcludedLibraries("fastadapter", "AndroidIconics", "Jsoup", "Retrofit", "okio",
-                    "OkHttp", "Butterknife", "CircleImageView")
+                    "Butterknife", "CircleImageView")
                 .withOnExtraListener { presenter.onExtraSelect(it) })
         }.let {
             fragmentCompat.onCreateView(inflater.context, inflater, container, savedInstanceState, it)
@@ -57,11 +58,11 @@ class AboutFragment : BaseFragment(), AboutView, MainView.TitledView {
     }
 
     override fun openDiscordInviteView() {
-        startActivity(Intent.parseUri("https://discord.gg/vccAQBr", 0))
+        context?.openInternetBrowser("https://discord.gg/vccAQBr", ::showMessage)
     }
 
     override fun openHomepageWebView() {
-        startActivity(Intent.parseUri("https://wulkanowy.github.io/", 0))
+        context?.openInternetBrowser("https://wulkanowy.github.io/", ::showMessage)
     }
 
     override fun openEmailClientView() {
@@ -80,7 +81,7 @@ class AboutFragment : BaseFragment(), AboutView, MainView.TitledView {
             if (intent.resolveActivity(it.packageManager) != null) {
                 startActivity(Intent.createChooser(intent, getString(R.string.about_feedback)))
             } else {
-                startActivity(Intent.parseUri("https://github.com/wulkanowy/wulkanowy/issues", 0))
+                it.openInternetBrowser("https://github.com/wulkanowy/wulkanowy/issues", ::showMessage)
             }
         }
     }

app/src/main/java/io/github/wulkanowy/ui/modules/about/AboutPresenter.kt

@@ -17,7 +17,7 @@ class AboutPresenter @Inject constructor(
 
     override fun onAttachView(view: AboutView) {
         super.onAttachView(view)
-        Timber.i("About view is attached")
+        Timber.i("About view was initialized")
     }
 
     fun onExtraSelect(type: Libs.SpecialButton?) {

app/src/main/java/io/github/wulkanowy/ui/modules/account/AccountDialog.kt

@@ -15,7 +15,6 @@ import eu.davidea.flexibleadapter.common.SmoothScrollLinearLayoutManager
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
 import io.github.wulkanowy.R
 import io.github.wulkanowy.ui.modules.login.LoginActivity
-import io.github.wulkanowy.ui.modules.main.MainActivity
 import io.github.wulkanowy.utils.setOnItemClickListener
 import kotlinx.android.synthetic.main.dialog_account.*
 import javax.inject.Inject
@@ -97,11 +96,8 @@ class AccountDialog : DaggerAppCompatDialogFragment(), AccountView {
         }
     }
 
-    override fun recreateView() {
+    override fun recreateMainView() {
-        activity?.also {
+        activity?.recreate()
-            startActivity(MainActivity.getStartIntent(it))
-            it.finish()
-        }
     }
 
     override fun onDestroy() {

app/src/main/java/io/github/wulkanowy/ui/modules/account/AccountItem.kt

@@ -1,5 +1,6 @@
 package io.github.wulkanowy.ui.modules.account
 
+import android.annotation.SuppressLint
 import android.view.View
 import eu.davidea.flexibleadapter.FlexibleAdapter
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
@@ -18,9 +19,10 @@ class AccountItem(val student: Student) : AbstractFlexibleItem<AccountItem.ViewH
         return ViewHolder(view, adapter)
     }
 
+    @SuppressLint("SetTextI18n")
     override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder, position: Int, payloads: MutableList<Any>?) {
         holder.apply {
-            accountItemName.text = student.studentName
+            accountItemName.text = "${student.studentName} ${student.className}"
             accountItemSchool.text = student.schoolName
             accountItemImage.setBackgroundResource(if (student.isCurrent) R.drawable.ic_account_circular_border else 0)
         }

app/src/main/java/io/github/wulkanowy/ui/modules/account/AccountPresenter.kt

@@ -19,8 +19,8 @@ class AccountPresenter @Inject constructor(
 
     override fun onAttachView(view: AccountView) {
         super.onAttachView(view)
-        Timber.i("Account dialog is attached")
         view.initView()
+        Timber.i("Account dialog view was initialized")
         loadData()
     }
 
@@ -54,7 +54,7 @@ class AccountPresenter @Inject constructor(
                         openClearLoginView()
                     } else {
                         Timber.i("Logout result: Switch to another student")
-                        recreateView()
+                        recreateMainView()
                     }
                 }
             }, {
@@ -73,9 +73,10 @@ class AccountPresenter @Inject constructor(
                 disposable.add(studentRepository.switchStudent(item.student)
                     .subscribeOn(schedulers.backgroundThread)
                     .observeOn(schedulers.mainThread)
+                    .doFinally { view?.dismissView() }
                     .subscribe({
                         Timber.i("Change a student result: Success")
-                        view?.recreateView()
+                        view?.recreateMainView()
                     }, {
                         Timber.i("Change a student result: An exception occurred")
                         errorHandler.dispatch(it)

app/src/main/java/io/github/wulkanowy/ui/modules/account/AccountView.kt

@@ -16,6 +16,6 @@ interface AccountView : BaseView {
 
     fun openClearLoginView()
 
-    fun recreateView()
+    fun recreateMainView()
 }
 

app/src/main/java/io/github/wulkanowy/ui/modules/attendance/AttendanceFragment.kt

@@ -77,12 +77,12 @@ class AttendanceFragment : BaseSessionFragment(), AttendanceView, MainView.MainC
         attendanceNextButton.setOnClickListener { presenter.onNextDay() }
     }
 
-    override fun onCreateOptionsMenu(menu: Menu?, inflater: MenuInflater?) {
+    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
-        inflater?.inflate(R.menu.action_menu_attendance, menu)
+        inflater.inflate(R.menu.action_menu_attendance, menu)
     }
 
-    override fun onOptionsItemSelected(item: MenuItem?): Boolean {
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
-        return if (item?.itemId == R.id.attendanceMenuSummary) presenter.onSummarySwitchSelected()
+        return if (item.itemId == R.id.attendanceMenuSummary) presenter.onSummarySwitchSelected()
         else false
     }
 
@@ -103,7 +103,7 @@ class AttendanceFragment : BaseSessionFragment(), AttendanceView, MainView.MainC
     }
 
     override fun onFragmentReselected() {
-        presenter.onViewReselected()
+        if (::presenter.isInitialized) presenter.onViewReselected()
     }
 
     override fun popView() {

app/src/main/java/io/github/wulkanowy/ui/modules/attendance/AttendancePresenter.kt

@@ -37,8 +37,8 @@ class AttendancePresenter @Inject constructor(
 
     fun onAttachView(view: AttendanceView, date: Long?) {
         super.onAttachView(view)
-        Timber.i("Attendance view is attached")
         view.initView()
+        Timber.i("Attendance view was initialized")
         loadData(ofEpochDay(date ?: now().previousOrSameSchoolDay.toEpochDay()))
         reloadView()
     }

app/src/main/java/io/github/wulkanowy/ui/modules/attendance/summary/AttendanceSummaryPresenter.kt

@@ -35,8 +35,8 @@ class AttendanceSummaryPresenter @Inject constructor(
 
     fun onAttachView(view: AttendanceSummaryView, subjectId: Int?) {
         super.onAttachView(view)
-        Timber.i("Attendance summary view is attached with subject id ${subjectId ?: -1}")
         view.initView()
+        Timber.i("Attendance summary view was initialized with subject id ${subjectId ?: -1}")
         loadData(subjectId ?: -1)
         loadSubjects()
     }

app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamFragment.kt

@@ -88,7 +88,7 @@ class ExamFragment : BaseSessionFragment(), ExamView, MainView.MainChildView, Ma
     }
 
     override fun onFragmentReselected() {
-        presenter.onViewReselected()
+        if (::presenter.isInitialized) presenter.onViewReselected()
     }
 
     override fun showEmpty(show: Boolean) {

app/src/main/java/io/github/wulkanowy/ui/modules/exam/ExamPresenter.kt

@@ -36,8 +36,8 @@ class ExamPresenter @Inject constructor(
 
     fun onAttachView(view: ExamView, date: Long?) {
         super.onAttachView(view)
-        Timber.i("Exam view is attached")
         view.initView()
+        Timber.i("Exam view was initialized")
         loadData(ofEpochDay(date ?: now().nextOrSameSchoolDay.toEpochDay()))
         reloadView()
     }

app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradeAverageProvider.kt

@@ -0,0 +1,54 @@
+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.preferences.PreferencesRepository
+import io.github.wulkanowy.utils.calcAverage
+import io.github.wulkanowy.utils.changeModifier
+import io.reactivex.Single
+import javax.inject.Inject
+
+class GradeAverageProvider @Inject constructor(
+    private val preferencesRepository: PreferencesRepository,
+    private val gradeRepository: GradeRepository
+) {
+    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)
+            "only_one_semester" -> getOnlyOneSemesterAverage(student, semesters, selectedSemesterId, forceRefresh)
+            else -> throw IllegalArgumentException("Incorrect grade average mode: ${preferencesRepository.gradeAverageMode} ")
+        }
+    }
+
+    private fun getAllYearAverage(student: Student, semesters: List<Semester>, semesterId: Int, forceRefresh: Boolean): Single<Map<String, Double>> {
+        val selectedSemester = semesters.single { it.semesterId == semesterId }
+        val firstSemester = semesters.single { it.diaryId == selectedSemester.diaryId && it.semesterName == 1 }
+        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() }
+            }
+    }
+
+    private fun getOnlyOneSemesterAverage(student: Student, semesters: List<Semester>, semesterId: Int, forceRefresh: Boolean): Single<Map<String, Double>> {
+        val selectedSemester = semesters.single { it.semesterId == semesterId }
+        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() }
+            }
+    }
+}

app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradeFragment.kt

@@ -57,9 +57,9 @@ class GradeFragment : BaseSessionFragment(), GradeView, MainView.MainChildView,
         presenter.onAttachView(this, savedInstanceState?.getInt(SAVED_SEMESTER_KEY))
     }
 
-    override fun onCreateOptionsMenu(menu: Menu?, inflater: MenuInflater?) {
+    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
-        inflater?.inflate(R.menu.action_menu_grade, menu)
+        inflater.inflate(R.menu.action_menu_grade, menu)
-        semesterSwitchMenu = menu?.findItem(R.id.gradeMenuSemester)
+        semesterSwitchMenu = menu.findItem(R.id.gradeMenuSemester)
         presenter.onCreateMenu()
     }
 
@@ -82,13 +82,13 @@ class GradeFragment : BaseSessionFragment(), GradeView, MainView.MainChildView,
         gradeSwipe.setOnRefreshListener { presenter.onSwipeRefresh() }
     }
 
-    override fun onOptionsItemSelected(item: MenuItem?): Boolean {
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
-        return if (item?.itemId == R.id.gradeMenuSemester) presenter.onSemesterSwitch()
+        return if (item.itemId == R.id.gradeMenuSemester) presenter.onSemesterSwitch()
         else false
     }
 
     override fun onFragmentReselected() {
-        presenter.onViewReselected()
+        if (::presenter.isInitialized) presenter.onViewReselected()
     }
 
     override fun showContent(show: Boolean) {

app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradePresenter.kt

@@ -27,12 +27,12 @@ class GradePresenter @Inject constructor(
 
     fun onAttachView(view: GradeView, savedIndex: Int?) {
         super.onAttachView(view)
-        Timber.i("Grade view is attached")
         selectedIndex = savedIndex ?: 0
         view.run {
             initView()
             enableSwipe(false)
         }
+        Timber.i("Grade view was initialized with $selectedIndex index")
         loadData()
     }
 

app/src/main/java/io/github/wulkanowy/ui/modules/grade/details/GradeDetailsFragment.kt

@@ -67,8 +67,8 @@ class GradeDetailsFragment : BaseSessionFragment(), GradeDetailsView, GradeView.
         presenter.onAttachView(this)
     }
 
-    override fun onCreateOptionsMenu(menu: Menu?, inflater: MenuInflater?) {
+    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
-        inflater?.inflate(R.menu.action_menu_grade_details, menu)
+        inflater.inflate(R.menu.action_menu_grade_details, menu)
     }
 
     override fun initView() {
@@ -88,8 +88,8 @@ class GradeDetailsFragment : BaseSessionFragment(), GradeDetailsView, GradeView.
         gradeDetailsSwipe.setOnRefreshListener { presenter.onSwipeRefresh() }
     }
 
-    override fun onOptionsItemSelected(item: MenuItem?): Boolean {
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
-        return if (item?.itemId == R.id.gradeDetailsMenuRead) presenter.onMarkAsReadSelected()
+        return if (item.itemId == R.id.gradeDetailsMenuRead) presenter.onMarkAsReadSelected()
         else false
     }
 

app/src/main/java/io/github/wulkanowy/ui/modules/grade/details/GradeDetailsPresenter.kt

@@ -8,10 +8,9 @@ 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.modules.grade.GradeAverageProvider
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
-import io.github.wulkanowy.utils.calcAverage
-import io.github.wulkanowy.utils.changeModifier
 import io.github.wulkanowy.utils.getBackgroundColor
 import timber.log.Timber
 import javax.inject.Inject
@@ -23,6 +22,7 @@ class GradeDetailsPresenter @Inject constructor(
     private val studentRepository: StudentRepository,
     private val semesterRepository: SemesterRepository,
     private val preferencesRepository: PreferencesRepository,
+    private val averageProvider: GradeAverageProvider,
     private val analytics: FirebaseAnalyticsHelper
 ) : BaseSessionPresenter<GradeDetailsView>(errorHandler) {
 
@@ -109,11 +109,16 @@ class GradeDetailsPresenter @Inject constructor(
     private fun loadData(semesterId: Int, forceRefresh: Boolean) {
         Timber.i("Loading grade details data started")
         disposable.add(studentRepository.getCurrentStudent()
-            .flatMap { semesterRepository.getSemesters(it).map { semester -> semester to it } }
+            .flatMap { semesterRepository.getSemesters(it).map { semester -> it to semester } }
-            .flatMap { gradeRepository.getGrades(it.second, it.first.first { item -> item.semesterId == semesterId }, forceRefresh) }
+            .flatMap { (student, semesters) ->
+                averageProvider.getGradeAverage(student, semesters, semesterId, forceRefresh)
+                    .flatMap { averages ->
+                        gradeRepository.getGrades(student, semesters.first { semester -> semester.semesterId == semesterId })
                             .map { it.sortedByDescending { grade -> grade.date } }
-            .map { it.map { item -> item.changeModifier(preferencesRepository.gradePlusModifier, preferencesRepository.gradeMinusModifier) } }
+                            .map { it.groupBy { grade -> grade.subject }.toSortedMap() }
-            .map { createGradeItems(it.groupBy { grade -> grade.subject }.toSortedMap()) }
+                            .map { createGradeItems(it, averages) }
+                    }
+            }
             .subscribeOn(schedulers.backgroundThread)
             .observeOn(schedulers.mainThread)
             .doFinally {
@@ -139,32 +144,36 @@ class GradeDetailsPresenter @Inject constructor(
             })
     }
 
-    private fun createGradeItems(items: Map<String, List<Grade>>): List<GradeDetailsHeader> {
+    private fun createGradeItems(items: Map<String, List<Grade>>, averages: Map<String, Double>): List<GradeDetailsHeader> {
+        val isGradeExpandable = preferencesRepository.isGradeExpandable
+        val gradeColorTheme = preferencesRepository.gradeColorTheme
+
+        val noDescriptionString = view?.noDescriptionString.orEmpty()
+        val weightString = view?.weightString.orEmpty()
+
         return items.map {
-            it.value.calcAverage().let { average ->
             GradeDetailsHeader(
                 subject = it.key,
-                    average = formatAverage(average),
+                average = formatAverage(averages[it.key]),
                 number = view?.getGradeNumberString(it.value.size).orEmpty(),
                 newGrades = it.value.filter { grade -> !grade.isRead }.size,
-                    isExpandable = preferencesRepository.isGradeExpandable
+                isExpandable = isGradeExpandable
             ).apply {
                 subItems = it.value.map { item ->
                     GradeDetailsItem(
                         grade = item,
-                            valueBgColor = item.getBackgroundColor(preferencesRepository.gradeColorTheme),
+                        valueBgColor = item.getBackgroundColor(gradeColorTheme),
-                            weightString = view?.weightString.orEmpty(),
+                        weightString = weightString,
-                            noDescriptionString = view?.noDescriptionString.orEmpty()
+                        noDescriptionString = noDescriptionString
                     )
                 }
             }
         }
     }
-    }
 
-    private fun formatAverage(average: Double): String {
+    private fun formatAverage(average: Double?): String {
         return view?.run {
-            if (average == 0.0) emptyAverageString
+            if (average == null || average == .0) emptyAverageString
             else averageString.format(average)
         }.orEmpty()
     }

app/src/main/java/io/github/wulkanowy/ui/modules/grade/summary/GradeSummaryPresenter.kt

@@ -1,17 +1,15 @@
 package io.github.wulkanowy.ui.modules.grade.summary
 
 import io.github.wulkanowy.data.db.entities.GradeSummary
-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.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.modules.grade.GradeAverageProvider
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
 import io.github.wulkanowy.utils.calcAverage
-import io.github.wulkanowy.utils.changeModifier
 import timber.log.Timber
 import java.lang.String.format
 import java.util.Locale.FRANCE
@@ -20,10 +18,9 @@ import javax.inject.Inject
 class GradeSummaryPresenter @Inject constructor(
     private val errorHandler: SessionErrorHandler,
     private val gradeSummaryRepository: GradeSummaryRepository,
-    private val gradeRepository: GradeRepository,
     private val studentRepository: StudentRepository,
     private val semesterRepository: SemesterRepository,
-    private val preferencesRepository: PreferencesRepository,
+    private val averageProvider: GradeAverageProvider,
     private val schedulers: SchedulersProvider,
     private val analytics: FirebaseAnalyticsHelper
 ) : BaseSessionPresenter<GradeSummaryView>(errorHandler) {
@@ -36,25 +33,13 @@ class GradeSummaryPresenter @Inject constructor(
     fun onParentViewLoadData(semesterId: Int, forceRefresh: Boolean) {
         Timber.i("Loading grade summary data started")
         disposable.add(studentRepository.getCurrentStudent()
-            .flatMap { semesterRepository.getSemesters(it).map { semester -> semester to it } }
+            .flatMap { semesterRepository.getSemesters(it).map { semesters -> it to semesters } }
-            .map { pair -> pair.first.first { it.semesterId == semesterId } to pair.second }
+            .flatMap { (student, semesters) ->
-            .flatMap {
+                gradeSummaryRepository.getGradesSummary(semesters.first { it.semesterId == semesterId }, forceRefresh)
-                gradeSummaryRepository.getGradesSummary(it.first, forceRefresh)
+                    .map { it.sortedBy { subject -> subject.subject } }
                     .flatMap { gradesSummary ->
-                        gradeRepository.getGrades(it.second, it.first, forceRefresh)
+                        averageProvider.getGradeAverage(student, semesters, semesterId, forceRefresh)
-                            .map { grades ->
+                            .map { averages -> createGradeSummaryItemsAndHeader(gradesSummary, averages) }
-                                grades.map { item -> item.changeModifier(preferencesRepository.gradePlusModifier, preferencesRepository.gradeMinusModifier) }
-                                    .groupBy { grade -> grade.subject }
-                                    .mapValues { entry -> entry.value.calcAverage() }
-                                    .filterValues { value -> value != 0.0 }
-                                    .let { averages ->
-                                        createGradeSummaryItems(gradesSummary, averages) to
-                                            GradeSummaryScrollableHeader(
-                                                formatAverage(gradesSummary.calcAverage()),
-                                                formatAverage(averages.values.average())
-                                            )
-                                    }
-                            }
                     }
             }
             .subscribeOn(schedulers.backgroundThread)
@@ -66,14 +51,14 @@ class GradeSummaryPresenter @Inject constructor(
                     enableSwipe(true)
                     notifyParentDataLoaded(semesterId)
                 }
-            }.subscribe({
+            }.subscribe({ (gradeSummaryItems, gradeSummaryHeader) ->
                 Timber.i("Loading grade summary result: Success")
                 view?.run {
-                    showEmpty(it.first.isEmpty())
+                    showEmpty(gradeSummaryItems.isEmpty())
-                    showContent(it.first.isNotEmpty())
+                    showContent(gradeSummaryItems.isNotEmpty())
-                    updateData(it.first, it.second)
+                    updateData(gradeSummaryItems, gradeSummaryHeader)
                 }
-                analytics.logEvent("load_grade_summary", "items" to it.first.size, "force_refresh" to forceRefresh)
+                analytics.logEvent("load_grade_summary", "items" to gradeSummaryItems.size, "force_refresh" to forceRefresh)
             }) {
                 Timber.i("Loading grade summary result: An exception occurred")
                 view?.run { showEmpty(isViewEmpty) }
@@ -104,15 +89,23 @@ class GradeSummaryPresenter @Inject constructor(
         disposable.clear()
     }
 
-    private fun createGradeSummaryItems(gradesSummary: List<GradeSummary>, averages: Map<String, Double>)
+    private fun createGradeSummaryItemsAndHeader(gradesSummary: List<GradeSummary>, averages: Map<String, Double>)
-        : List<GradeSummaryItem> {
+        : Pair<List<GradeSummaryItem>, GradeSummaryScrollableHeader> {
-        return gradesSummary.filter { !checkEmpty(it, averages) }.map { it ->
+        return averages.filterValues { value -> value != 0.0 }
+            .let { filteredAverages ->
+                gradesSummary.filter { !checkEmpty(it, filteredAverages) }
+                    .map {
                         GradeSummaryItem(
                             title = it.subject,
-                average = formatAverage(averages.getOrElse(it.subject) { 0.0 }, ""),
+                            average = formatAverage(filteredAverages.getOrElse(it.subject) { 0.0 }, ""),
                             predictedGrade = it.predictedGrade,
                             finalGrade = it.finalGrade
                         )
+                    }.let {
+                        it to GradeSummaryScrollableHeader(
+                            formatAverage(gradesSummary.calcAverage()),
+                            formatAverage(filteredAverages.values.average()))
+                    }
             }
     }
 

app/src/main/java/io/github/wulkanowy/ui/modules/homework/HomeworkPresenter.kt

@@ -34,8 +34,8 @@ class HomeworkPresenter @Inject constructor(
 
     fun onAttachView(view: HomeworkView, date: Long?) {
         super.onAttachView(view)
-        Timber.i("Homework view is attached")
         view.initView()
+        Timber.i("Homework view was initialized")
         loadData(LocalDate.ofEpochDay(date ?: LocalDate.now().nextOrSameSchoolDay.toEpochDay()))
         reloadView()
     }

app/src/main/java/io/github/wulkanowy/ui/modules/login/LoginPresenter.kt

@@ -14,7 +14,7 @@ class LoginPresenter @Inject constructor(errorHandler: ErrorHandler) : BasePrese
             initAdapter()
             showActionBar(false)
         }
-        Timber.i("Login view is attached")
+        Timber.i("Login view was initialized")
     }
 
     fun onFormViewAccountLogged(students: List<Student>, loginData: Triple<String, String, String>) {

app/src/main/java/io/github/wulkanowy/ui/modules/login/form/LoginFormFragment.kt

@@ -16,6 +16,7 @@ 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.hideSoftInput
+import io.github.wulkanowy.utils.openInternetBrowser
 import io.github.wulkanowy.utils.setOnItemSelectedListener
 import io.github.wulkanowy.utils.setOnTextChangedListener
 import io.github.wulkanowy.utils.showSoftInput
@@ -53,7 +54,8 @@ class LoginFormFragment : BaseFragment(), LoginFormView {
         loginFormName.setOnTextChangedListener { presenter.onNameTextChanged() }
         loginFormPass.setOnTextChangedListener { presenter.onPassTextChanged() }
         loginFormHost.setOnItemSelectedListener { presenter.onHostSelected() }
-        loginFormSignIn.setOnClickListener { presenter.attemptLogin() }
+        loginFormSignIn.setOnClickListener { presenter.onSignInClick() }
+        loginFormPrivacyLink.setOnClickListener { presenter.onPrivacyLinkClick() }
 
         loginFormPass.setOnEditorActionListener { _, id, _ ->
             if (id == IME_ACTION_DONE || id == IME_NULL) loginFormSignIn.callOnClick() else false
@@ -130,6 +132,10 @@ class LoginFormFragment : BaseFragment(), LoginFormView {
         }
     }
 
+    override fun showPrivacyPolicy() {
+        loginFormPrivacyLink.visibility = VISIBLE
+    }
+
     override fun notifyParentAccountLogged(students: List<Student>) {
         (activity as? LoginActivity)?.onFormFragmentAccountLogged(students, Triple(
             loginFormName.text.toString(),
@@ -138,6 +144,10 @@ class LoginFormFragment : BaseFragment(), LoginFormView {
         ))
     }
 
+    override fun openPrivacyPolicyPage() {
+        context?.openInternetBrowser("https://wulkanowy.github.io/polityka-prywatnosci.html", ::showMessage)
+    }
+
     override fun onDestroyView() {
         super.onDestroyView()
         presenter.onDetachView()

app/src/main/java/io/github/wulkanowy/ui/modules/login/form/LoginFormPresenter.kt

@@ -22,7 +22,8 @@ class LoginFormPresenter @Inject constructor(
         super.onAttachView(view)
         view.run {
             initView()
-            if (isDebug) showVersion()
+            if (isDebug) showVersion() else showPrivacyPolicy()
+
             errorHandler.onBadCredentials = {
                 setErrorPassIncorrect()
                 showSoftKeyboard()
@@ -31,6 +32,10 @@ class LoginFormPresenter @Inject constructor(
         }
     }
 
+    fun onPrivacyLinkClick() {
+        view?.openPrivacyPolicyPage()
+    }
+
     fun onHostSelected() {
         view?.apply {
             clearPassError()
@@ -47,7 +52,7 @@ class LoginFormPresenter @Inject constructor(
         view?.clearNameError()
     }
 
-    fun attemptLogin() {
+    fun onSignInClick() {
         val email = view?.formNameValue.orEmpty()
         val password = view?.formPassValue.orEmpty()
         val endpoint = view?.formHostValue.orEmpty()

app/src/main/java/io/github/wulkanowy/ui/modules/login/form/LoginFormView.kt

@@ -37,5 +37,9 @@ interface LoginFormView : BaseView {
 
     fun showVersion()
 
+    fun showPrivacyPolicy()
+
     fun notifyParentAccountLogged(students: List<Student>)
+
+    fun openPrivacyPolicyPage()
 }

app/src/main/java/io/github/wulkanowy/ui/modules/login/studentselect/LoginStudentSelectFragment.kt

@@ -1,14 +1,11 @@
 package io.github.wulkanowy.ui.modules.login.studentselect
 
-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
 import android.view.View.GONE
 import android.view.View.VISIBLE
 import android.view.ViewGroup
-import androidx.appcompat.app.AppCompatActivity
 import eu.davidea.flexibleadapter.FlexibleAdapter
 import eu.davidea.flexibleadapter.common.SmoothScrollLinearLayoutManager
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
@@ -45,6 +42,7 @@ class LoginStudentSelectFragment : BaseFragment(), LoginStudentSelectView {
     }
 
     override fun initView() {
+        loginStudentSelectSignIn.setOnClickListener { presenter.onSignIn() }
         loginAdapter.apply { setOnItemClickListener { presenter.onItemSelected(it) } }
 
         loginStudentSelectRecycler.apply {
@@ -54,14 +52,11 @@ class LoginStudentSelectFragment : BaseFragment(), LoginStudentSelectView {
     }
 
     override fun updateData(data: List<LoginStudentSelectItem>) {
-        loginAdapter.updateDataSet(data, true)
+        loginAdapter.updateDataSet(data)
     }
 
     override fun openMainView() {
-        activity?.let {
+        activity?.let { startActivity(MainActivity.getStartIntent(context = it, clear = true)) }
-            startActivity(MainActivity.getStartIntent(it)
-                .apply { addFlags(FLAG_ACTIVITY_CLEAR_TASK or FLAG_ACTIVITY_NEW_TASK) })
-        }
     }
 
     override fun showProgress(show: Boolean) {
@@ -69,11 +64,11 @@ class LoginStudentSelectFragment : BaseFragment(), LoginStudentSelectView {
     }
 
     override fun showContent(show: Boolean) {
-        loginStudentSelectRecycler.visibility = if (show) VISIBLE else GONE
+        loginStudentSelectContent.visibility = if (show) VISIBLE else GONE
     }
 
-    override fun showActionBar(show: Boolean) {
+    override fun enableSignIn(enable: Boolean) {
-        (activity as? AppCompatActivity)?.supportActionBar?.run { if (show) show() else hide() }
+        loginStudentSelectSignIn.isEnabled = enable
     }
 
     fun onParentInitStudentSelectFragment(students: List<Student>) {

app/src/main/java/io/github/wulkanowy/ui/modules/login/studentselect/LoginStudentSelectItem.kt

@@ -1,5 +1,6 @@
 package io.github.wulkanowy.ui.modules.login.studentselect
 
+import android.annotation.SuppressLint
 import android.view.View
 import eu.davidea.flexibleadapter.FlexibleAdapter
 import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
@@ -12,15 +13,16 @@ import kotlinx.android.synthetic.main.item_login_student_select.*
 
 class LoginStudentSelectItem(val student: Student) : AbstractFlexibleItem<LoginStudentSelectItem.ItemViewHolder>() {
 
-    override fun getLayoutRes(): Int = R.layout.item_login_student_select
+    override fun getLayoutRes() = R.layout.item_login_student_select
 
     override fun createViewHolder(view: View, adapter: FlexibleAdapter<IFlexible<*>>): ItemViewHolder {
         return ItemViewHolder(view, adapter)
     }
 
-    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ItemViewHolder, position: Int, payloads: MutableList<Any>?) {
+    @SuppressLint("SetTextI18n")
-        holder.run {
+    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ItemViewHolder, position: Int, payloads: MutableList<Any>) {
-            loginItemName.text = student.studentName
+        holder.apply {
+            loginItemName.text = "${student.studentName} ${student.className}"
             loginItemSchool.text = student.schoolName
         }
     }
@@ -41,7 +43,17 @@ class LoginStudentSelectItem(val student: Student) : AbstractFlexibleItem<LoginS
     }
 
     class ItemViewHolder(view: View, adapter: FlexibleAdapter<*>) : FlexibleViewHolder(view, adapter), LayoutContainer {
+
         override val containerView: View
             get() = itemView
+
+        init {
+            loginItemCheck.setOnClickListener { super.onClick(loginItemContainer) }
+        }
+
+        override fun onClick(view: View?) {
+            super.onClick(view)
+            loginItemCheck.apply { isChecked = !isChecked }
+        }
     }
 }

app/src/main/java/io/github/wulkanowy/ui/modules/login/studentselect/LoginStudentSelectPresenter.kt

@@ -8,7 +8,6 @@ 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.reactivex.Single
 import timber.log.Timber
 import java.io.Serializable
 import javax.inject.Inject
@@ -22,10 +21,13 @@ class LoginStudentSelectPresenter @Inject constructor(
 
     var students = emptyList<Student>()
 
+    var selectedStudents = mutableListOf<Student>()
+
     fun onAttachView(view: LoginStudentSelectView, students: Serializable?) {
         super.onAttachView(view)
         view.run {
             initView()
+            enableSignIn(false)
             errorHandler.onStudentDuplicate = {
                 showMessage(it)
                 Timber.i("The student already registered in the app was selected")
@@ -37,13 +39,21 @@ class LoginStudentSelectPresenter @Inject constructor(
         }
     }
 
+    fun onSignIn() {
+        registerStudents(selectedStudents)
+    }
+
     fun onParentInitStudentSelectView(students: List<Student>) {
         loadData(students)
+        if (students.size == 1) registerStudents(students)
     }
 
     fun onItemSelected(item: AbstractFlexibleItem<*>?) {
         if (item is LoginStudentSelectItem) {
-            registerStudent(item.student)
+            selectedStudents.removeAll { it == item.student }
+                .let { if (!it) selectedStudents.add(item.student) }
+
+            view?.enableSignIn(selectedStudents.isNotEmpty())
         }
     }
 
@@ -54,33 +64,30 @@ class LoginStudentSelectPresenter @Inject constructor(
         }
     }
 
-    private fun registerStudent(student: Student) {
+    private fun registerStudents(students: List<Student>) {
-        disposable.add(studentRepository.saveStudent(student)
+        disposable.add(studentRepository.saveStudents(students)
-            .map { student.apply { id = it } }
+            .map { students.first().apply { id = it.first() } }
-            .onErrorResumeNext { studentRepository.logoutStudent(student).andThen(Single.error(it)) }
+            .flatMapCompletable { studentRepository.switchStudent(it) }
-            .flatMapCompletable { studentRepository.switchStudent(student) }
             .subscribeOn(schedulers.backgroundThread)
             .observeOn(schedulers.mainThread)
             .doOnSubscribe {
                 view?.apply {
                     showProgress(true)
                     showContent(false)
-                    showActionBar(false)
                 }
                 Timber.i("Registration started")
             }
             .subscribe({
-                analytics.logEvent("registration_student_select", SUCCESS to true, "endpoint" to student.endpoint, "symbol" to student.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 ->
-                analytics.logEvent("registration_student_select", SUCCESS to false, "endpoint" to student.endpoint, "symbol" to student.symbol, "error" to it.localizedMessage)
+                students.forEach { analytics.logEvent("registration_student_select", SUCCESS to false, "endpoint" to it.endpoint, "symbol" to it.symbol, "error" to error.localizedMessage) }
                 Timber.i("Registration result: An exception occurred ")
-                errorHandler.dispatch(it)
+                errorHandler.dispatch(error)
                 view?.apply {
                     showProgress(false)
                     showContent(true)
-                    showActionBar(true)
                 }
             }))
     }

app/src/main/java/io/github/wulkanowy/ui/modules/login/studentselect/LoginStudentSelectView.kt

@@ -14,5 +14,5 @@ interface LoginStudentSelectView : BaseView {
 
     fun showContent(show: Boolean)
 
-    fun showActionBar(show: Boolean)
+    fun enableSignIn(enable: Boolean)
 }

app/src/main/java/io/github/wulkanowy/ui/modules/luckynumber/LuckyNumberPresenter.kt

@@ -21,12 +21,12 @@ class LuckyNumberPresenter @Inject constructor(
 
     override fun onAttachView(view: LuckyNumberView) {
         super.onAttachView(view)
-        Timber.i("Lucky number view is attached")
         view.run {
             initView()
             showContent(false)
             enableSwipe(false)
         }
+        Timber.i("Lucky number view was initialized")
         loadData()
     }
 

app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetConfigureActivity.kt

@@ -0,0 +1,77 @@
+package io.github.wulkanowy.ui.modules.luckynumberwidget
+
+import android.appwidget.AppWidgetManager.ACTION_APPWIDGET_UPDATE
+import android.appwidget.AppWidgetManager.EXTRA_APPWIDGET_ID
+import android.appwidget.AppWidgetManager.EXTRA_APPWIDGET_IDS
+import android.content.Intent
+import android.os.Bundle
+import android.widget.Toast
+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.activity_widget_configure.*
+import javax.inject.Inject
+
+class LuckyNumberWidgetConfigureActivity : BaseActivity(), LuckyNumberWidgetConfigureView {
+
+    @Inject
+    lateinit var configureAdapter: FlexibleAdapter<AbstractFlexibleItem<*>>
+
+    @Inject
+    lateinit var presenter: LuckyNumberWidgetConfigurePresenter
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setResult(RESULT_CANCELED)
+        setContentView(R.layout.activity_widget_configure)
+
+        intent.extras.let {
+            presenter.onAttachView(this, it?.getInt(EXTRA_APPWIDGET_ID))
+        }
+    }
+
+    override fun initView() {
+        widgetConfigureRecycler.apply {
+            adapter = configureAdapter
+            layoutManager = SmoothScrollLinearLayoutManager(context)
+        }
+        configureAdapter.setOnItemClickListener { presenter.onItemSelect(it) }
+    }
+
+    override fun updateData(data: List<LuckyNumberWidgetConfigureItem>) {
+        configureAdapter.updateDataSet(data)
+    }
+
+    override fun updateLuckyNumberWidget(widgetId: Int) {
+        sendBroadcast(Intent(this, LuckyNumberWidgetProvider::class.java)
+            .apply {
+                action = ACTION_APPWIDGET_UPDATE
+                putExtra(EXTRA_APPWIDGET_IDS, intArrayOf(widgetId))
+            })
+    }
+
+    override fun setSuccessResult(widgetId: Int) {
+        setResult(RESULT_OK, Intent().apply { putExtra(EXTRA_APPWIDGET_ID, widgetId) })
+    }
+
+    override fun showError(text: String, error: Throwable) {
+        Toast.makeText(this, text, Toast.LENGTH_LONG).show()
+    }
+
+    override fun finishView() {
+        finish()
+    }
+
+    override fun openLoginView() {
+        startActivity(LoginActivity.getStartIntent(this))
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        presenter.onDetachView()
+    }
+}

app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetConfigureItem.kt

@@ -0,0 +1,54 @@
+package io.github.wulkanowy.ui.modules.luckynumberwidget
+
+import android.annotation.SuppressLint
+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.Student
+import io.github.wulkanowy.ui.modules.timetablewidget.TimetableWidgetConfigureItem
+import kotlinx.android.extensions.LayoutContainer
+import kotlinx.android.synthetic.main.item_account.*
+
+class LuckyNumberWidgetConfigureItem(var student: Student, val isCurrent: Boolean) :
+    AbstractFlexibleItem<LuckyNumberWidgetConfigureItem.ViewHolder>() {
+
+    override fun getLayoutRes() = R.layout.item_account
+
+    override fun createViewHolder(view: View, adapter: FlexibleAdapter<IFlexible<*>>): ViewHolder {
+        return ViewHolder(view, adapter)
+    }
+
+    @SuppressLint("SetTextI18n")
+    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder, position: Int, payloads: MutableList<Any>) {
+        holder.apply {
+            accountItemName.text = "${student.studentName} ${student.className}"
+            accountItemSchool.text = student.schoolName
+            accountItemImage.setBackgroundResource(if (isCurrent) R.drawable.ic_account_circular_border else 0)
+        }
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as TimetableWidgetConfigureItem
+
+        if (student != other.student) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = student.hashCode()
+        result = 31 * result + student.id.toInt()
+        return result
+    }
+
+    class ViewHolder(view: View, adapter: FlexibleAdapter<*>) : FlexibleViewHolder(view, adapter), LayoutContainer {
+        override val containerView: View
+            get() = contentView
+    }
+}

app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetConfigurePresenter.kt

@@ -0,0 +1,62 @@
+package io.github.wulkanowy.ui.modules.luckynumberwidget
+
+import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
+import io.github.wulkanowy.data.db.SharedPrefHelper
+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.ui.modules.luckynumberwidget.LuckyNumberWidgetProvider.Companion.getStudentWidgetKey
+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,
+    private val sharedPref: SharedPrefHelper
+) : BasePresenter<LuckyNumberWidgetConfigureView>(errorHandler) {
+
+    private var appWidgetId: Int? = null
+
+    fun onAttachView(view: LuckyNumberWidgetConfigureView, appWidgetId: Int?) {
+        super.onAttachView(view)
+        this.appWidgetId = appWidgetId
+        view.initView()
+        loadData()
+    }
+
+    fun onItemSelect(item: AbstractFlexibleItem<*>) {
+        if (item is LuckyNumberWidgetConfigureItem) {
+            registerStudent(item.student)
+        }
+    }
+
+    private fun loadData() {
+        disposable.add(studentRepository.getSavedStudents(false)
+            .map { it to appWidgetId?.let { id -> sharedPref.getLong(getStudentWidgetKey(id), 0) } }
+            .map { (students, currentStudentId) ->
+                students.map { student -> LuckyNumberWidgetConfigureItem(student, student.id == currentStudentId) }
+            }
+            .subscribeOn(schedulers.backgroundThread)
+            .observeOn(schedulers.mainThread)
+            .subscribe({
+                when {
+                    it.isEmpty() -> view?.openLoginView()
+                    it.size == 1 -> registerStudent(it.single().student)
+                    else -> view?.updateData(it)
+                }
+            }, { errorHandler.dispatch(it) }))
+    }
+
+    private fun registerStudent(student: Student) {
+        appWidgetId?.also {
+            sharedPref.putLong(getStudentWidgetKey(it), student.id)
+            view?.apply {
+                updateLuckyNumberWidget(it)
+                setSuccessResult(it)
+            }
+        }
+        view?.finishView()
+    }
+}

app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetConfigureView.kt

@@ -0,0 +1,19 @@
+package io.github.wulkanowy.ui.modules.luckynumberwidget
+
+import io.github.wulkanowy.ui.base.BaseView
+import io.github.wulkanowy.ui.modules.timetablewidget.TimetableWidgetConfigureItem
+
+interface LuckyNumberWidgetConfigureView : BaseView {
+
+    fun initView()
+
+    fun updateData(data: List<LuckyNumberWidgetConfigureItem>)
+
+    fun updateLuckyNumberWidget(widgetId: Int)
+
+    fun setSuccessResult(widgetId: Int)
+
+    fun finishView()
+
+    fun openLoginView()
+}

app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetProvider.kt

@@ -0,0 +1,182 @@
+package io.github.wulkanowy.ui.modules.luckynumberwidget
+
+import android.annotation.TargetApi
+import android.app.PendingIntent
+import android.app.PendingIntent.FLAG_UPDATE_CURRENT
+import android.appwidget.AppWidgetManager
+import android.appwidget.AppWidgetManager.ACTION_APPWIDGET_DELETED
+import android.appwidget.AppWidgetManager.ACTION_APPWIDGET_OPTIONS_CHANGED
+import android.appwidget.AppWidgetManager.ACTION_APPWIDGET_UPDATE
+import android.appwidget.AppWidgetManager.EXTRA_APPWIDGET_ID
+import android.appwidget.AppWidgetManager.EXTRA_APPWIDGET_IDS
+import android.appwidget.AppWidgetManager.EXTRA_APPWIDGET_OPTIONS
+import android.appwidget.AppWidgetManager.OPTION_APPWIDGET_MAX_HEIGHT
+import android.appwidget.AppWidgetManager.OPTION_APPWIDGET_MAX_WIDTH
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import android.view.View.GONE
+import android.view.View.VISIBLE
+import android.widget.RemoteViews
+import dagger.android.AndroidInjection
+import io.github.wulkanowy.R
+import io.github.wulkanowy.data.db.SharedPrefHelper
+import io.github.wulkanowy.data.db.entities.LuckyNumber
+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.modules.main.MainActivity
+import io.github.wulkanowy.ui.modules.main.MainView.MenuView
+import io.github.wulkanowy.utils.SchedulersProvider
+import io.reactivex.Maybe
+import timber.log.Timber
+import javax.inject.Inject
+
+class LuckyNumberWidgetProvider : BroadcastReceiver() {
+
+    @Inject
+    lateinit var studentRepository: StudentRepository
+
+    @Inject
+    lateinit var semesterRepository: SemesterRepository
+
+    @Inject
+    lateinit var luckyNumberRepository: LuckyNumberRepository
+
+    @Inject
+    lateinit var schedulers: SchedulersProvider
+
+    @Inject
+    lateinit var appWidgetManager: AppWidgetManager
+
+    @Inject
+    lateinit var sharedPref: SharedPrefHelper
+
+    companion object {
+        fun getStudentWidgetKey(appWidgetId: Int) = "lucky_number_widget_student_$appWidgetId"
+    }
+
+    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
+    override fun onReceive(context: Context, intent: Intent) {
+        AndroidInjection.inject(this, context)
+        when (intent.action) {
+            ACTION_APPWIDGET_UPDATE -> onUpdate(context, intent)
+            ACTION_APPWIDGET_DELETED -> onDelete(intent)
+            ACTION_APPWIDGET_OPTIONS_CHANGED -> onOptionsChange(context, intent)
+        }
+    }
+
+    private fun onUpdate(context: Context, intent: Intent) {
+        intent.getIntArrayExtra(EXTRA_APPWIDGET_IDS)?.forEach { appWidgetId ->
+            RemoteViews(context.packageName, R.layout.widget_luckynumber).apply {
+                setTextViewText(R.id.luckyNumberWidgetNumber,
+                    getLuckyNumber(sharedPref.getLong(getStudentWidgetKey(appWidgetId), 0), appWidgetId)?.luckyNumber?.toString() ?: "#"
+                )
+                setOnClickPendingIntent(R.id.luckyNumberWidgetContainer,
+                    PendingIntent.getActivity(context, MenuView.LUCKY_NUMBER.id,
+                        MainActivity.getStartIntent(context, MenuView.LUCKY_NUMBER, true), FLAG_UPDATE_CURRENT))
+            }.also {
+                setStyles(it, intent)
+                appWidgetManager.updateAppWidget(appWidgetId, it)
+            }
+        }
+    }
+
+    private fun onDelete(intent: Intent) {
+        intent.getIntExtra(EXTRA_APPWIDGET_ID, 0).let {
+            if (it != 0) sharedPref.delete(getStudentWidgetKey(it))
+        }
+    }
+
+    private fun getLuckyNumber(studentId: Long, appWidgetId: Int): LuckyNumber? {
+        return try {
+            studentRepository.isStudentSaved()
+                .filter { true }
+                .flatMap { studentRepository.getSavedStudents().toMaybe() }
+                .flatMap { students ->
+                    students.singleOrNull { student -> student.id == studentId }
+                        .let { student ->
+                            when {
+                                student != null -> Maybe.just(student)
+                                studentId != 0L -> {
+                                    studentRepository.getCurrentStudent(false)
+                                        .toMaybe()
+                                        .doOnSuccess { sharedPref.putLong(getStudentWidgetKey(appWidgetId), it.id) }
+                                }
+                                else -> null
+                            }
+                        }
+                }
+                .flatMap { semesterRepository.getCurrentSemester(it).toMaybe() }
+                .flatMap { luckyNumberRepository.getLuckyNumber(it) }
+                .subscribeOn(schedulers.backgroundThread)
+                .blockingGet()
+        } catch (e: Exception) {
+            Timber.e(e, "An error has occurred in lucky number provider")
+            null
+        }
+    }
+
+    private fun onOptionsChange(context: Context, intent: Intent) {
+        intent.extras?.let { extras ->
+            RemoteViews(context.packageName, R.layout.widget_luckynumber).apply {
+                setStyles(this, intent)
+                appWidgetManager.updateAppWidget(extras.getInt(EXTRA_APPWIDGET_ID), this)
+            }
+        }
+    }
+
+    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
+    private fun setStyles(views: RemoteViews, intent: Intent) {
+        val options = intent.extras?.getBundle(EXTRA_APPWIDGET_OPTIONS)
+
+        val maxWidth = options?.getInt(OPTION_APPWIDGET_MAX_WIDTH) ?: 150
+        val maxHeight = options?.getInt(OPTION_APPWIDGET_MAX_HEIGHT) ?: 40
+
+        Timber.d("New lucky number widget measurement: %dx%d", maxWidth, maxHeight)
+
+        when {
+            // 1x1
+            maxWidth < 150 && maxHeight < 110 -> {
+                Timber.d("Lucky number widget size: 1x1")
+                views.run {
+                    setViewVisibility(R.id.luckyNumberWidgetImageTop, GONE)
+                    setViewVisibility(R.id.luckyNumberWidgetImageLeft, GONE)
+                    setViewVisibility(R.id.luckyNumberWidgetTitle, GONE)
+                    setViewVisibility(R.id.luckyNumberWidgetNumber, VISIBLE)
+                }
+            }
+            // 1x2
+            maxWidth < 150 && maxHeight > 110 -> {
+                Timber.d("Lucky number widget size: 1x2")
+                views.run {
+                    setViewVisibility(R.id.luckyNumberWidgetImageTop, VISIBLE)
+                    setViewVisibility(R.id.luckyNumberWidgetImageLeft, GONE)
+                    setViewVisibility(R.id.luckyNumberWidgetTitle, GONE)
+                    setViewVisibility(R.id.luckyNumberWidgetNumber, VISIBLE)
+                }
+            }
+            // 2x1
+            maxWidth >= 150 && maxHeight <= 110 -> {
+                Timber.d("Lucky number widget size: 2x1")
+                views.run {
+                    setViewVisibility(R.id.luckyNumberWidgetImageTop, GONE)
+                    setViewVisibility(R.id.luckyNumberWidgetImageLeft, VISIBLE)
+                    setViewVisibility(R.id.luckyNumberWidgetTitle, GONE)
+                    setViewVisibility(R.id.luckyNumberWidgetNumber, VISIBLE)
+                }
+            }
+            // 2x2 and bigger
+            else -> {
+                Timber.d("Lucky number widget size: 2x2 and bigger")
+                views.run {
+                    setViewVisibility(R.id.luckyNumberWidgetImageTop, GONE)
+                    setViewVisibility(R.id.luckyNumberWidgetImageLeft, GONE)
+                    setViewVisibility(R.id.luckyNumberWidgetTitle, VISIBLE)
+                    setViewVisibility(R.id.luckyNumberWidgetNumber, VISIBLE)
+                }
+            }
+        }
+    }
+}

app/src/main/java/io/github/wulkanowy/ui/modules/main/MainActivity.kt

@@ -5,7 +5,6 @@ import android.content.Intent
 import android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK
 import android.content.Intent.FLAG_ACTIVITY_NEW_TASK
 import android.os.Bundle
-import android.os.Handler
 import android.view.Menu
 import android.view.MenuItem
 import androidx.appcompat.app.AlertDialog
@@ -22,8 +21,12 @@ import io.github.wulkanowy.ui.modules.account.AccountDialog
 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
+import io.github.wulkanowy.ui.modules.note.NoteFragment
 import io.github.wulkanowy.ui.modules.timetable.TimetableFragment
 import io.github.wulkanowy.utils.getThemeAttrColor
 import io.github.wulkanowy.utils.safelyPopFragment
@@ -40,9 +43,15 @@ class MainActivity : BaseActivity(), MainView {
     lateinit var navController: FragNavController
 
     companion object {
-        const val EXTRA_START_MENU_INDEX = "extraStartMenuIndex"
+        const val EXTRA_START_MENU = "extraStartMenu"
 
-        fun getStartIntent(context: Context) = Intent(context, MainActivity::class.java)
+        fun getStartIntent(context: Context, startMenu: MainView.MenuView? = null, clear: Boolean = false): Intent {
+            return Intent(context, MainActivity::class.java)
+                .apply {
+                    if (clear) flags = FLAG_ACTIVITY_NEW_TASK or FLAG_ACTIVITY_CLEAR_TASK
+                    startMenu?.let { putExtra(EXTRA_START_MENU, it) }
+                }
+        }
     }
 
     override val isRootView: Boolean
@@ -56,14 +65,27 @@ class MainActivity : BaseActivity(), MainView {
 
     override var startMenuIndex = 0
 
+    override var startMenuMoreIndex = -1
+
+    private val moreMenuFragments = listOf<Fragment>(
+        MessageFragment.newInstance(),
+        HomeworkFragment.newInstance(),
+        NoteFragment.newInstance(),
+        LuckyNumberFragment.newInstance()
+    )
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
         setSupportActionBar(mainToolbar)
         messageContainer = mainFragmentContainer
 
-        presenter.onAttachView(this, intent.getIntExtra(EXTRA_START_MENU_INDEX, -1))
+        presenter.onAttachView(this, intent.getSerializableExtra(EXTRA_START_MENU) as? MainView.MenuView)
-        navController.initialize(startMenuIndex, savedInstanceState)
+
+        navController.run {
+            initialize(startMenuIndex, savedInstanceState)
+            pushFragment(moreMenuFragments.getOrNull(startMenuMoreIndex))
+        }
     }
 
     override fun onCreateOptionsMenu(menu: Menu?): Boolean {
@@ -74,7 +96,7 @@ class MainActivity : BaseActivity(), MainView {
     override fun initView() {
         mainBottomNav.run {
             addItems(
-                mutableListOf(
+                listOf(
                     AHBottomNavigationItem(R.string.grade_title, R.drawable.ic_menu_main_grade_26dp, 0),
                     AHBottomNavigationItem(R.string.attendance_title, R.drawable.ic_menu_main_attendance_24dp, 0),
                     AHBottomNavigationItem(R.string.exam_title, R.drawable.ic_menu_main_exam_24dp, 0),
@@ -142,9 +164,7 @@ class MainActivity : BaseActivity(), MainView {
     }
 
     override fun notifyMenuViewReselected() {
-        Handler().postDelayed({
+        (navController.currentStack?.getOrNull(0) as? MainView.MainChildView)?.onFragmentReselected()
-            (navController.currentStack?.get(0) as? MainView.MainChildView)?.onFragmentReselected()
-        }, 250)
     }
 
     fun showDialogFragment(dialog: DialogFragment) {
@@ -168,9 +188,10 @@ class MainActivity : BaseActivity(), MainView {
             .apply { addFlags(FLAG_ACTIVITY_CLEAR_TASK or FLAG_ACTIVITY_NEW_TASK) })
     }
 
-    override fun onSaveInstanceState(outState: Bundle?) {
+    override fun onSaveInstanceState(outState: Bundle) {
         super.onSaveInstanceState(outState)
         navController.onSaveInstanceState(outState)
+        intent.removeExtra(EXTRA_START_MENU)
     }
 
     override fun onDestroy() {

app/src/main/java/io/github/wulkanowy/ui/modules/main/MainPresenter.kt

@@ -22,22 +22,19 @@ class MainPresenter @Inject constructor(
     private val analytics: FirebaseAnalyticsHelper
 ) : BasePresenter<MainView>(errorHandler) {
 
-    fun onAttachView(view: MainView, initMenuIndex: Int) {
+    fun onAttachView(view: MainView, initMenu: MainView.MenuView?) {
         super.onAttachView(view)
-        view.run {
+        view.apply {
-            startMenuIndex = if (initMenuIndex != -1) initMenuIndex else prefRepository.startMenuIndex
+            getProperViewIndexes(initMenu).let { (main, more) ->
-            Timber.i("Main view is attached with $startMenuIndex menu index")
+                startMenuIndex = main
+                startMenuMoreIndex = more
+            }
             initView()
+            Timber.i("Main view was initialized with $startMenuIndex menu index and $startMenuMoreIndex more index")
         }
 
         syncManager.startSyncWorker()
-
+        analytics.logEvent(APP_OPEN, DESTINATION to initMenu?.name)
-        analytics.logEvent(APP_OPEN, DESTINATION to when (initMenuIndex) {
-            1 -> "Grades"
-            3 -> "Timetable"
-            4 -> "More"
-            else -> "User action"
-        })
     }
 
     fun onViewChange() {
@@ -104,4 +101,12 @@ class MainPresenter @Inject constructor(
                 errorHandler.dispatch(it)
             }))
     }
+
+    private fun getProperViewIndexes(initMenu: MainView.MenuView?): Pair<Int, Int> {
+        return when {
+            initMenu?.id in 0..3 -> initMenu!!.id to -1
+            (initMenu?.id ?: 0) > 3 -> 4 to initMenu!!.id - 4
+            else -> prefRepository.startMenuIndex to -1
+        }
+    }
 }

app/src/main/java/io/github/wulkanowy/ui/modules/main/MainView.kt

@@ -6,6 +6,8 @@ interface MainView : BaseView {
 
     var startMenuIndex: Int
 
+    var startMenuMoreIndex: Int
+
     val isRootView: Boolean
 
     val currentViewTitle: String?
@@ -37,4 +39,15 @@ interface MainView : BaseView {
 
         val titleStringId: Int
     }
+
+    enum class MenuView(val id: Int) {
+        GRADE(0),
+        ATTENDANCE(1),
+        EXAM(2),
+        TIMETABLE(3),
+        MESSAGE(4),
+        HOMEWORK(5),
+        NOTE(6),
+        LUCKY_NUMBER(7),
+    }
 }

app/src/main/java/io/github/wulkanowy/ui/modules/message/MessageFragment.kt

@@ -7,6 +7,7 @@ import android.view.View.INVISIBLE
 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.data.repositories.message.MessageFolder.RECEIVED
 import io.github.wulkanowy.data.repositories.message.MessageFolder.SENT
 import io.github.wulkanowy.data.repositories.message.MessageFolder.TRASHED
@@ -75,12 +76,20 @@ class MessageFragment : BaseFragment(), MessageView, MainView.TitledView {
         messageProgress.visibility = if (show) VISIBLE else INVISIBLE
     }
 
+    fun onDeleteMessage(message: Message) {
+        presenter.onDeleteMessage(message)
+    }
+
     fun onChildFragmentLoaded() {
         presenter.onChildViewLoaded()
     }
 
+    override fun notifyChildMessageDeleted(tabId: Int) {
+        (pagerAdapter.getFragmentInstance(tabId) as? MessageTabFragment)?.onParentDeleteMessage()
+    }
+
     override fun notifyChildLoadData(index: Int, forceRefresh: Boolean) {
-        (pagerAdapter.getFragmentInstance(index) as? MessageView.MessageChildView)?.onParentLoadData(forceRefresh)
+        (pagerAdapter.getFragmentInstance(index) as? MessageTabFragment)?.onParentLoadData(forceRefresh)
     }
 
     override fun openSendMessage() {

app/src/main/java/io/github/wulkanowy/ui/modules/message/MessagePresenter.kt

@@ -1,5 +1,6 @@
 package io.github.wulkanowy.ui.modules.message
 
+import io.github.wulkanowy.data.db.entities.Message
 import io.github.wulkanowy.ui.base.BasePresenter
 import io.github.wulkanowy.ui.base.ErrorHandler
 import io.github.wulkanowy.utils.SchedulersProvider
@@ -15,10 +16,10 @@ class MessagePresenter @Inject constructor(
 
     override fun onAttachView(view: MessageView) {
         super.onAttachView(view)
-        Timber.i("Message view is attached")
         disposable.add(Completable.timer(150, MILLISECONDS, schedulers.mainThread)
             .subscribe {
                 view.initView()
+                Timber.i("Message view was initialized")
                 loadData()
             })
     }
@@ -43,6 +44,15 @@ class MessagePresenter @Inject constructor(
         }
     }
 
+    fun onDeleteMessage(message: Message) {
+        view?.notifyChildMessageDeleted(
+            when (message.removed) {
+                true -> 2
+                else -> message.folderId - 1
+            }
+        )
+    }
+
     fun onSendMessageButtonClicked() {
         view?.openSendMessage()
     }

app/src/main/java/io/github/wulkanowy/ui/modules/message/MessageView.kt

@@ -14,10 +14,7 @@ interface MessageView : BaseView {
 
     fun notifyChildLoadData(index: Int, forceRefresh: Boolean)
 
+    fun notifyChildMessageDeleted(tabId: Int)
+
     fun openSendMessage()
-
-    interface MessageChildView {
-
-        fun onParentLoadData(forceRefresh: Boolean)
-    }
 }

app/src/main/java/io/github/wulkanowy/ui/modules/message/preview/MessagePreviewFragment.kt

@@ -13,7 +13,9 @@ 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.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.message.send.SendMessageActivity
 import kotlinx.android.synthetic.main.fragment_message_preview.*
 import javax.inject.Inject
@@ -25,6 +27,8 @@ class MessagePreviewFragment : BaseSessionFragment(), MessagePreviewView, MainVi
     lateinit var presenter: MessagePreviewPresenter
 
     private var menuReplyButton: MenuItem? = null
+    private var menuForwardButton: MenuItem? = null
+    private var menuDeleteButton: MenuItem? = null
 
     override val titleStringId: Int
         get() = R.string.message_title
@@ -32,6 +36,9 @@ class MessagePreviewFragment : BaseSessionFragment(), MessagePreviewView, MainVi
     override val noSubjectString: String
         get() = getString(R.string.message_no_subject)
 
+    override val deleteMessageSuccessString: String
+        get() = getString(R.string.message_delete_success)
+
     companion object {
         const val MESSAGE_ID_KEY = "message_id"
 
@@ -57,15 +64,21 @@ class MessagePreviewFragment : BaseSessionFragment(), MessagePreviewView, MainVi
         presenter.onAttachView(this, (savedInstanceState ?: arguments)?.getInt(MESSAGE_ID_KEY) ?: 0)
     }
 
-    override fun onCreateOptionsMenu(menu: Menu?, inflater: MenuInflater?) {
+    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
-        inflater?.inflate(R.menu.action_menu_message_preview, menu)
+        inflater.inflate(R.menu.action_menu_message_preview, menu)
-        menuReplyButton = menu?.findItem(R.id.messagePreviewMenuReply)
+        menuReplyButton = menu.findItem(R.id.messagePreviewMenuReply)
+        menuForwardButton = menu.findItem(R.id.messagePreviewMenuForward)
+        menuDeleteButton = menu.findItem(R.id.messagePreviewMenuDelete)
         presenter.onCreateOptionsMenu()
     }
 
-    override fun onOptionsItemSelected(item: MenuItem?): Boolean {
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
-        return if (item?.itemId == R.id.messagePreviewMenuReply) presenter.onReply()
+        return when (item.itemId) {
-        else false
+            R.id.messagePreviewMenuReply -> presenter.onReply()
+            R.id.messagePreviewMenuForward -> presenter.onForward()
+            R.id.messagePreviewMenuDelete -> presenter.onMessageDelete()
+            else -> false
+        }
     }
 
     override fun setSubject(subject: String) {
@@ -92,8 +105,22 @@ class MessagePreviewFragment : BaseSessionFragment(), MessagePreviewView, MainVi
         messagePreviewProgress.visibility = if (show) VISIBLE else GONE
     }
 
-    override fun showReplyButton(show: Boolean) {
+    override fun showContent(show: Boolean) {
+        messagePreviewContentContainer.visibility = if (show) VISIBLE else GONE
+    }
+
+    override fun showOptions(show: Boolean) {
         menuReplyButton?.isVisible = show
+        menuForwardButton?.isVisible = show
+        menuDeleteButton?.isVisible = show
+    }
+
+    override fun setDeletedOptionsLabels() {
+        menuDeleteButton?.setTitle(R.string.message_delete_forever)
+    }
+
+    override fun setNotDeletedOptionsLabels() {
+        menuDeleteButton?.setTitle(R.string.message_move_to_bin)
     }
 
     override fun showMessageError() {
@@ -101,9 +128,21 @@ class MessagePreviewFragment : BaseSessionFragment(), MessagePreviewView, MainVi
     }
 
     override fun openMessageReply(message: Message?) {
+        context?.let { it.startActivity(SendMessageActivity.getStartIntent(it, message, true)) }
+    }
+
+    override fun openMessageForward(message: Message?) {
         context?.let { it.startActivity(SendMessageActivity.getStartIntent(it, message)) }
     }
 
+    override fun popView() {
+        (activity as MainActivity).popView()
+    }
+
+    override fun notifyParentMessageDeleted(message: Message) {
+        fragmentManager?.fragments?.forEach { if (it is MessageFragment) it.onDeleteMessage(message) }
+    }
+
     override fun onSaveInstanceState(outState: Bundle) {
         super.onSaveInstanceState(outState)
         outState.putInt(MESSAGE_ID_KEY, presenter.messageId)