Version 0.7.3

* Remove unnecessary this

.travis.yml

@@ -14,6 +14,7 @@ cache:
 #branches:
 #  only:
 #  - master
+#  - 0.7.x
 
 android:
  licenses:

app/build.gradle

@@ -16,8 +16,8 @@ android {
         testApplicationId "io.github.tests.wulkanowy"
         minSdkVersion 15
         targetSdkVersion 28
-        versionCode 26
-        versionName "0.7.0"
+        versionCode 29
+        versionName "0.7.3"
         multiDexEnabled true
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
@@ -77,7 +77,7 @@ play {
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
-    implementation('io.github.wulkanowy:api:0.7.0') { exclude module: "threetenbp" }
+    implementation('io.github.wulkanowy:api:0.7.3') { exclude module: "threetenbp" }
 
     implementation "androidx.legacy:legacy-support-v4:1.0.0"
     implementation "androidx.appcompat:appcompat:1.0.2"
@@ -86,10 +86,14 @@ dependencies {
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     implementation 'androidx.multidex:multidex:2.0.1'
 
-    implementation 'com.takisoft.preferencex:preferencex:1.0.0'
+    implementation "androidx.work:work-runtime:2.0.0"
+    implementation "androidx.work:work-rxjava2:2.0.0"
 
-    implementation "android.arch.work:work-rxjava2:1.0.0"
-    implementation "android.arch.work:work-runtime:1.0.0"
+    implementation "androidx.room:room-runtime:2.1.0-alpha06"
+    implementation "androidx.room:room-rxjava2:2.1.0-alpha06"
+    kapt "androidx.room:room-compiler:2.1.0-alpha06"
+
+    implementation 'com.takisoft.preferencex:preferencex:1.0.0'
 
     implementation 'com.squareup.inject:assisted-inject-annotations-dagger2:0.3.3'
     kapt 'com.squareup.inject:assisted-inject-processor-dagger2:0.3.3'
@@ -98,17 +102,13 @@ dependencies {
     kapt "com.google.dagger:dagger-compiler:2.21"
     kapt "com.google.dagger:dagger-android-processor:2.21"
 
-    implementation "androidx.room:room-runtime:2.1.0-alpha05"
-    implementation "androidx.room:room-rxjava2:2.1.0-alpha05"
-    kapt "androidx.room:room-compiler:2.1.0-alpha05"
-
     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:3.1.0'
+    implementation 'com.ncapdevi:frag-nav:3.2.0'
 
     implementation 'com.github.wulkanowy:MaterialChipsInput:b72fd0ee6f'
-    implementation 'com.github.PhilJay:MPAndroidChart:971640b29d'
+    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'
@@ -128,15 +128,15 @@ dependencies {
     debugImplementation "com.amitshekhar.android:debug-db:1.0.6"
 
     testImplementation "junit:junit:4.12"
-    testImplementation "io.mockk:mockk:1.9.1"
-    testImplementation "org.mockito:mockito-inline:2.25.0"
+    testImplementation "io.mockk:mockk:1.9.2"
+    testImplementation "org.mockito:mockito-inline:2.25.1"
     testImplementation 'org.threeten:threetenbp:1.3.8'
 
-    androidTestImplementation "io.mockk:mockk-android:1.9.1"
     androidTestImplementation 'androidx.test:core:1.1.0'
     androidTestImplementation 'androidx.test:runner:1.1.1'
     androidTestImplementation 'androidx.test.ext:junit:1.1.0'
-    androidTestImplementation 'org.mockito:mockito-android:2.25.0'
+    androidTestImplementation "io.mockk:mockk-android:1.9.2"
+    androidTestImplementation 'org.mockito:mockito-android:2.25.1'
     androidTestImplementation "org.jetbrains.kotlin:kotlin-test:$kotlin_version"
 }
 

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

@@ -34,9 +34,9 @@ class GradeLocalTest {
     @Test
     fun saveAndReadTest() {
         gradeLocal.saveGrades(listOf(
-            createGradeLocal(5, 3, LocalDate.of(2018, 9, 10), "", 1),
-            createGradeLocal(4, 4, LocalDate.of(2019, 2, 27), "", 2),
-            createGradeLocal(3, 5, LocalDate.of(2019, 2, 28), "", 2)
+            createGradeLocal(5, 3.0, LocalDate.of(2018, 9, 10), "", 1),
+            createGradeLocal(4, 4.0, LocalDate.of(2019, 2, 27), "", 2),
+            createGradeLocal(3, 5.0, LocalDate.of(2019, 2, 28), "", 2)
         ))
 
         val grades = gradeLocal

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

@@ -71,10 +71,10 @@ class GradeRepositoryTest {
     @Test
     fun markOlderThanRegisterDateAsRead() {
         every { mockApi.getGrades(1) } returns Single.just(listOf(
-            createGradeApi(5, 4, of(2019, 2, 25), "Ocena pojawiła się"),
-            createGradeApi(5, 4, of(2019, 2, 26), "przed zalogowanie w aplikacji"),
-            createGradeApi(5, 4, of(2019, 2, 27), "Ocena z dnia logowania"),
-            createGradeApi(5, 4, of(2019, 2, 28), "Ocena jeszcze nowsza")
+            createGradeApi(5, 4.0, of(2019, 2, 25), "Ocena pojawiła się"),
+            createGradeApi(5, 4.0, of(2019, 2, 26), "przed zalogowanie w aplikacji"),
+            createGradeApi(5, 4.0, of(2019, 2, 27), "Ocena z dnia logowania"),
+            createGradeApi(5, 4.0, of(2019, 2, 28), "Ocena jeszcze nowsza")
         ))
 
         val grades = GradeRepository(settings, gradeLocal, gradeRemote)
@@ -89,16 +89,16 @@ class GradeRepositoryTest {
     @Test
     fun mitigateOldGradesNotifications() {
         gradeLocal.saveGrades(listOf(
-            createGradeLocal(5, 3, of(2019, 2, 25), "Jedna ocena"),
-            createGradeLocal(4, 4, of(2019, 2, 26), "Druga"),
-            createGradeLocal(3, 5, of(2019, 2, 27), "Trzecia")
+            createGradeLocal(5, 3.0, of(2019, 2, 25), "Jedna ocena"),
+            createGradeLocal(4, 4.0, of(2019, 2, 26), "Druga"),
+            createGradeLocal(3, 5.0, of(2019, 2, 27), "Trzecia")
         ))
 
         every { mockApi.getGrades(1) } returns Single.just(listOf(
-            createGradeApi(5, 2, of(2019, 2, 25), "Ocena ma datę, jest inna, ale nie zostanie powiadomiona"),
-            createGradeApi(4, 3, of(2019, 2, 26), "starszą niż ostatnia lokalnie"),
-            createGradeApi(3, 4, of(2019, 2, 27), "Ta jest z tego samego dnia co ostatnia lokalnie"),
-            createGradeApi(2, 5, of(2019, 2, 28), "Ta jest już w ogóle nowa")
+            createGradeApi(5, 2.0, of(2019, 2, 25), "Ocena ma datę, jest inna, ale nie zostanie powiadomiona"),
+            createGradeApi(4, 3.0, of(2019, 2, 26), "starszą niż ostatnia lokalnie"),
+            createGradeApi(3, 4.0, of(2019, 2, 27), "Ta jest z tego samego dnia co ostatnia lokalnie"),
+            createGradeApi(2, 5.0, of(2019, 2, 28), "Ta jest już w ogóle nowa")
         ))
 
         val grades = GradeRepository(settings, gradeLocal, gradeRemote)

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

@@ -5,7 +5,7 @@ import org.threeten.bp.LocalDate
 import io.github.wulkanowy.api.grades.Grade as GradeRemote
 import io.github.wulkanowy.data.db.entities.Grade as GradeLocal
 
-fun createGradeLocal(value: Int, weight: Int, date: LocalDate, desc: String, semesterId: Int = 1): GradeLocal {
+fun createGradeLocal(value: Int, weight: Double, date: LocalDate, desc: String, semesterId: Int = 1): GradeLocal {
     return GradeLocal(
         semesterId = semesterId,
         studentId = 1,
@@ -24,7 +24,7 @@ fun createGradeLocal(value: Int, weight: Int, date: LocalDate, desc: String, sem
     )
 }
 
-fun createGradeApi(value: Int, weight: Int, date: LocalDate, desc: String): GradeRemote {
+fun createGradeApi(value: Int, weight: Double, date: LocalDate, desc: String): GradeRemote {
     return GradeRemote().apply {
         this.value = value
         this.weightValue = weight

app/src/main/AndroidManifest.xml

@@ -39,18 +39,12 @@
             android:name=".ui.modules.main.MainActivity"
             android:configChanges="orientation|screenSize"
             android:label="@string/main_title"
-            android:launchMode="singleTop"
             android:theme="@style/WulkanowyTheme.NoActionBar" />
         <activity
             android:name=".ui.modules.message.send.SendMessageActivity"
             android:configChanges="orientation|screenSize"
             android:label="@string/send_message_title"
-            android:parentActivityName=".ui.modules.main.MainActivity"
-            android:theme="@style/WulkanowyTheme.NoActionBar">
-            <meta-data
-                android:name="android.support.PARENT_ACTIVITY"
-                android:value=".ui.modules.main.MainActivity" />
-        </activity>
+            android:theme="@style/WulkanowyTheme.NoActionBar" />
 
         <service
             android:name=".services.widgets.TimetableWidgetService"
@@ -58,6 +52,7 @@
 
         <receiver
             android:name=".ui.widgets.timetable.TimetableWidgetProvider"
+            android:exported="true"
             android:label="@string/timetable_title">
             <intent-filter>
                 <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />

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

@@ -19,7 +19,11 @@ import io.github.wulkanowy.di.DaggerAppComponent
 import io.github.wulkanowy.services.sync.SyncWorkerFactory
 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() {
@@ -42,6 +46,7 @@ class WulkanowyApp : DaggerApplication() {
         if (DEBUG) enableDebugLog()
         AppCompatDelegate.setDefaultNightMode(prefRepository.currentTheme)
         WorkManager.initialize(this, Configuration.Builder().setWorkerFactory(workerFactory).build())
+        RxJavaPlugins.setErrorHandler(::onError)
     }
 
     private fun enableDebugLog() {
@@ -56,6 +61,12 @@ class WulkanowyApp : DaggerApplication() {
         Timber.plant(CrashlyticsTree())
     }
 
+    private fun onError(t: Throwable) {
+        if (t is UndeliverableException && t.cause is IOException || t.cause is InterruptedException) {
+            Timber.e(t.cause, "An undeliverable error occurred")
+        } else throw t
+    }
+
     override fun applicationInjector(): AndroidInjector<out DaggerApplication> {
         return DaggerAppComponent.builder().create(this)
     }

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

@@ -41,6 +41,7 @@ import io.github.wulkanowy.data.db.entities.Student
 import io.github.wulkanowy.data.db.entities.Subject
 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.Migration2
 import io.github.wulkanowy.data.db.migrations.Migration3
 import io.github.wulkanowy.data.db.migrations.Migration4
@@ -79,7 +80,7 @@ import javax.inject.Singleton
 abstract class AppDatabase : RoomDatabase() {
 
     companion object {
-        const val VERSION_SCHEMA = 10
+        const val VERSION_SCHEMA = 11
 
         fun newInstance(context: Context): AppDatabase {
             return Room.databaseBuilder(context, AppDatabase::class.java, "wulkanowy_database")
@@ -95,7 +96,8 @@ abstract class AppDatabase : RoomDatabase() {
                     Migration7(),
                     Migration8(),
                     Migration9(),
-                    Migration10()
+                    Migration10(),
+                    Migration11()
                 )
                 .build()
         }

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

@@ -1,8 +1,8 @@
 package io.github.wulkanowy.data.db.dao
 
 import androidx.room.Dao
+import androidx.room.Delete
 import androidx.room.Insert
-import androidx.room.OnConflictStrategy.IGNORE
 import androidx.room.Query
 import io.github.wulkanowy.data.db.entities.Semester
 import io.reactivex.Maybe
@@ -12,15 +12,12 @@ import javax.inject.Singleton
 @Dao
 interface SemesterDao {
 
-    @Insert(onConflict = IGNORE)
+    @Insert
     fun insertAll(semester: List<Semester>)
 
+    @Delete
+    fun deleteAll(semester: List<Semester>)
+
     @Query("SELECT * FROM Semesters WHERE student_id = :studentId")
     fun loadAll(studentId: Int): Maybe<List<Semester>>
-
-    @Query("UPDATE Semesters SET is_current = 1 WHERE semester_id = :semesterId AND diary_id = :diaryId")
-    fun updateCurrent(semesterId: Int, diaryId: Int)
-
-    @Query("UPDATE Semesters SET is_current = 0 WHERE student_id = :studentId")
-    fun resetCurrent(studentId: Int)
 }

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

@@ -34,7 +34,7 @@ data class Grade(
 
     val weight: String,
 
-    val weightValue: Int,
+    val weightValue: Double,
 
     val date: LocalDate,
 

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

@@ -0,0 +1,34 @@
+package io.github.wulkanowy.data.db.migrations
+
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
+
+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,
+                is_read INTEGER NOT NULL,
+                is_notified INTEGER NOT NULL,
+                semester_id INTEGER NOT NULL,
+                student_id INTEGER NOT NULL,
+                subject TEXT NOT NULL,
+                entry TEXT NOT NULL,
+                value INTEGER NOT NULL,
+                modifier REAL NOT NULL,
+                comment TEXT NOT NULL,
+                color TEXT NOT NULL,
+                grade_symbol TEXT NOT NULL,
+                description TEXT NOT NULL,
+                weight TEXT NOT NULL,
+                weightValue REAL NOT NULL,
+                date INTEGER NOT NULL,
+                teacher TEXT NOT NULL
+            )
+        """)
+        database.execSQL("INSERT INTO Grades_temp SELECT * FROM Grades")
+        database.execSQL("DROP TABLE Grades")
+        database.execSQL("ALTER TABLE Grades_temp RENAME TO Grades")
+    }
+}

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

@@ -11,17 +11,14 @@ import javax.inject.Singleton
 class SemesterLocal @Inject constructor(private val semesterDb: SemesterDao) {
 
     fun saveSemesters(semesters: List<Semester>) {
-        return semesterDb.insertAll(semesters)
+        semesterDb.insertAll(semesters)
+    }
+
+    fun deleteSemesters(semesters: List<Semester>) {
+        semesterDb.deleteAll(semesters)
     }
 
     fun getSemesters(student: Student): Maybe<List<Semester>> {
         return semesterDb.loadAll(student.studentId).filter { !it.isEmpty() }
     }
-
-    fun setCurrentSemester(semester: Semester) {
-        semesterDb.run {
-            resetCurrent(semester.studentId)
-            updateCurrent(semester.semesterId, semester.diaryId)
-        }
-    }
 }

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

@@ -7,6 +7,7 @@ import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
 import io.reactivex.Maybe
 import io.reactivex.Single
+import timber.log.Timber
 import java.net.UnknownHostException
 import javax.inject.Inject
 import javax.inject.Singleton
@@ -25,10 +26,17 @@ class SemesterRepository @Inject constructor(
             .switchIfEmpty(ReactiveNetwork.checkInternetConnectivity(settings)
                 .flatMap {
                     if (it) remote.getSemesters(student) else Single.error(UnknownHostException())
-                }.map { newSemesters ->
-                    local.apply {
-                        saveSemesters(newSemesters)
-                        setCurrentSemester(newSemesters.single { it.isCurrent })
+                }.flatMap { new ->
+                    val currentSemesters = new.filter { it.isCurrent }
+                    if (currentSemesters.size == 1) {
+                        local.getSemesters(student).toSingle(emptyList())
+                            .doOnSuccess { old ->
+                                local.deleteSemesters(old - new)
+                                local.saveSemesters(new - old)
+                            }
+                    } else {
+                        Timber.i("Current semesters list:\n${currentSemesters.joinToString(separator = "\n")}")
+                        throw IllegalArgumentException("Current semester can be only one.")
                     }
                 }.flatMap { local.getSemesters(student).toSingle(emptyList()) })
     }

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

@@ -3,7 +3,6 @@ package io.github.wulkanowy.di
 import dagger.Module
 import dagger.android.ContributesAndroidInjector
 import io.github.wulkanowy.di.scopes.PerActivity
-import io.github.wulkanowy.services.widgets.TimetableWidgetService
 import io.github.wulkanowy.ui.modules.login.LoginActivity
 import io.github.wulkanowy.ui.modules.login.LoginModule
 import io.github.wulkanowy.ui.modules.main.MainActivity
@@ -30,9 +29,6 @@ internal abstract class BuilderModule {
     @ContributesAndroidInjector
     abstract fun bindMessageSendActivity(): SendMessageActivity
 
-    @ContributesAndroidInjector
-    abstract fun bindTimetableWidgetService(): TimetableWidgetService
-
     @ContributesAndroidInjector
     abstract fun bindTimetableWidgetProvider(): TimetableWidgetProvider
 }

app/src/main/java/io/github/wulkanowy/services/ServicesModule.kt

@@ -9,6 +9,7 @@ import com.squareup.inject.assisted.dagger2.AssistedModule
 import dagger.Binds
 import dagger.Module
 import dagger.Provides
+import dagger.android.ContributesAndroidInjector
 import dagger.multibindings.IntoSet
 import io.github.wulkanowy.services.sync.works.AttendanceSummaryWork
 import io.github.wulkanowy.services.sync.works.AttendanceWork
@@ -24,6 +25,7 @@ import io.github.wulkanowy.services.sync.works.NoteWork
 import io.github.wulkanowy.services.sync.works.RecipientWork
 import io.github.wulkanowy.services.sync.works.TimetableWork
 import io.github.wulkanowy.services.sync.works.Work
+import io.github.wulkanowy.services.widgets.TimetableWidgetService
 import javax.inject.Singleton
 
 @AssistedModule
@@ -48,6 +50,9 @@ abstract class ServicesModule {
         fun provideNotificationManager(context: Context) = context.getSystemService(NOTIFICATION_SERVICE) as NotificationManager
     }
 
+    @ContributesAndroidInjector
+    abstract fun bindTimetableWidgetService(): TimetableWidgetService
+
     @Binds
     @IntoSet
     abstract fun provideGradeWork(work: GradeWork): Work

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

@@ -11,6 +11,7 @@ import androidx.work.WorkerParameters
 import com.squareup.inject.assisted.Assisted
 import com.squareup.inject.assisted.AssistedInject
 import io.github.wulkanowy.R
+import io.github.wulkanowy.api.interceptor.FeatureDisabledException
 import io.github.wulkanowy.data.repositories.preferences.PreferencesRepository
 import io.github.wulkanowy.data.repositories.semester.SemesterRepository
 import io.github.wulkanowy.data.repositories.student.StudentRepository
@@ -33,19 +34,31 @@ class SyncWorker @AssistedInject constructor(
 ) : RxWorker(appContext, workerParameters) {
 
     override fun createWork(): Single<Result> {
-        return studentRepository.getCurrentStudent()
+        Timber.i("SyncWorker is starting")
+        return studentRepository.isStudentSaved()
+            .filter { true }
+            .flatMap { studentRepository.getCurrentStudent().toMaybe() }
             .flatMapCompletable { student ->
                 semesterRepository.getCurrentSemester(student, true)
                     .flatMapCompletable { semester ->
-                        Completable.mergeDelayError(works.map { it.create(student, semester) })
+                        Completable.mergeDelayError(works.map { work ->
+                            work.create(student, semester)
+                                .doOnSubscribe { Timber.i("${work::class.java.simpleName} is starting") }
+                                .doOnError { Timber.i("${work::class.java.simpleName} result: An exception occurred") }
+                                .doOnComplete { Timber.i("${work::class.java.simpleName} result: Success") }
+                        })
                     }
             }
             .toSingleDefault(Result.success())
             .onErrorReturn {
                 Timber.e(it, "There was an error during synchronization")
-                Result.retry()
+                if (it is FeatureDisabledException) Result.success()
+                else Result.retry()
+            }
+            .doOnSuccess {
+                if (preferencesRepository.isDebugNotificationEnable) notify(it)
+                Timber.i("SyncWorker result: $it")
             }
-            .doOnSuccess { if (preferencesRepository.isDebugNotificationEnable) notify(it) }
     }
 
     private fun notify(result: Result) {

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

@@ -13,10 +13,10 @@ class RecipientWork @Inject constructor(
 ) : Work {
 
     override fun create(student: Student, semester: Semester): Completable {
-        return reportingUnitRepository.getReportingUnits(student)
+        return reportingUnitRepository.getReportingUnits(student, true)
             .flatMapCompletable { units ->
                 Completable.mergeDelayError(units.map {
-                    recipientRepository.getRecipients(student, 2, it).ignoreElement()
+                    recipientRepository.getRecipients(student, 2, it, true).ignoreElement()
                 })
             }
     }

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

@@ -43,7 +43,8 @@ class AboutFragment : BaseFragment(), AboutView, MainView.TitledView {
                 .withAboutSpecial3(getString(R.string.about_feedback))
                 .withFields(R.string::class.java.fields)
                 .withCheckCachedDetection(false)
-                .withExcludedLibraries("fastadapter", "AndroidIconics", "gson", "Jsoup", "Retrofit", "okio", "OkHttp")
+                .withExcludedLibraries("fastadapter", "AndroidIconics", "Jsoup", "Retrofit", "okio",
+                    "OkHttp", "Butterknife", "CircleImageView")
                 .withOnExtraListener { presenter.onExtraSelect(it) })
         }.let {
             fragmentCompat.onCreateView(inflater.context, inflater, container, savedInstanceState, it)
@@ -68,7 +69,7 @@ class AboutFragment : BaseFragment(), AboutView, MainView.TitledView {
             data = Uri.parse("mailto:")
             putExtra(Intent.EXTRA_EMAIL, Array(1) { "wulkanowyinc@gmail.com" })
             putExtra(Intent.EXTRA_SUBJECT, "Zgłoszenie błędu")
-            putExtra(Intent.EXTRA_TEXT,"Tu umieść treść zgłoszenia\n\n" + "-".repeat(40) + "\n" + """
+            putExtra(Intent.EXTRA_TEXT, "Tu umieść treść zgłoszenia\n\n" + "-".repeat(40) + "\n" + """
                 Build: ${BuildConfig.VERSION_CODE}
                 SDK: ${android.os.Build.VERSION.SDK_INT}
                 Device: ${android.os.Build.MANUFACTURER} ${android.os.Build.MODEL}

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

@@ -14,12 +14,12 @@ class AccountItem(val student: Student) : AbstractFlexibleItem<AccountItem.ViewH
 
     override fun getLayoutRes() = R.layout.item_account
 
-    override fun createViewHolder(view: View?, adapter: FlexibleAdapter<IFlexible<*>>?): ViewHolder {
+    override fun createViewHolder(view: View, adapter: FlexibleAdapter<IFlexible<*>>): ViewHolder {
         return ViewHolder(view, adapter)
     }
 
-    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>?, holder: ViewHolder?, position: Int, payloads: MutableList<Any>?) {
-        holder?.apply {
+    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder, position: Int, payloads: MutableList<Any>?) {
+        holder.apply {
             accountItemName.text = student.studentName
             accountItemSchool.text = student.schoolName
             accountItemImage.setBackgroundResource(if (student.isCurrent) R.drawable.ic_account_circular_border else 0)
@@ -38,14 +38,13 @@ class AccountItem(val student: Student) : AbstractFlexibleItem<AccountItem.ViewH
     }
 
     override fun hashCode(): Int {
-        return student.hashCode()
+        var result = student.hashCode()
+        result = 31 * result + student.id.toInt()
+        return result
     }
 
-    class ViewHolder(view: View?, adapter: FlexibleAdapter<IFlexible<*>>?) : FlexibleViewHolder(view, adapter),
-        LayoutContainer {
-
-        override val containerView: View?
+    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/attendance/AttendanceItem.kt

@@ -14,14 +14,13 @@ import kotlinx.android.synthetic.main.item_attendance.*
 
 class AttendanceItem(val attendance: Attendance) : AbstractFlexibleItem<AttendanceItem.ViewHolder>() {
 
+    override fun getLayoutRes() = R.layout.item_attendance
+
     override fun createViewHolder(view: View, adapter: FlexibleAdapter<IFlexible<*>>): ViewHolder {
         return ViewHolder(view, adapter)
     }
 
-    override fun getLayoutRes(): Int = R.layout.item_attendance
-
-    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder,
-                                position: Int, payloads: MutableList<Any>?) {
+    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder, position: Int, payloads: MutableList<Any>?) {
         holder.apply {
             attendanceItemNumber.text = attendance.number.toString()
             attendanceItemSubject.text = attendance.subject
@@ -37,16 +36,17 @@ class AttendanceItem(val attendance: Attendance) : AbstractFlexibleItem<Attendan
         other as AttendanceItem
 
         if (attendance != other.attendance) return false
+
         return true
     }
 
     override fun hashCode(): Int {
-        return attendance.hashCode()
+        var result = attendance.hashCode()
+        result = 31 * result + attendance.id.toInt()
+        return result
     }
 
-    class ViewHolder(val view: View, adapter: FlexibleAdapter<*>) : FlexibleViewHolder(view, adapter),
-            LayoutContainer {
-
+    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/attendance/AttendancePresenter.kt

@@ -135,7 +135,7 @@ class AttendancePresenter @Inject constructor(
             clearData()
             showNextButton(!currentDate.plusDays(1).isHolidays)
             showPreButton(!currentDate.minusDays(1).isHolidays)
-            updateNavigationDay(currentDate.toFormattedString("EEEE \n dd.MM.YYYY").capitalize())
+            updateNavigationDay(currentDate.toFormattedString("EEEE\ndd.MM.YYYY").capitalize())
         }
     }
 }

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

@@ -23,12 +23,12 @@ class AttendanceSummaryItem(
 
     override fun getLayoutRes() = R.layout.item_attendance_summary
 
-    override fun createViewHolder(view: View?, adapter: FlexibleAdapter<IFlexible<*>>?): ViewHolder {
+    override fun createViewHolder(view: View, adapter: FlexibleAdapter<IFlexible<*>>): ViewHolder {
         return ViewHolder(view, adapter)
     }
 
-    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>?, holder: ViewHolder?, position: Int, payloads: MutableList<Any>?) {
-        holder?.apply {
+    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder, position: Int, payloads: MutableList<Any>?) {
+        holder.apply {
             attendanceSummaryMonth.text = month
             attendanceSummaryPercentage.text = percentage
             attendanceSummaryPresent.text = present
@@ -73,10 +73,8 @@ class AttendanceSummaryItem(
         return result
     }
 
-    class ViewHolder(view: View?, adapter: FlexibleAdapter<IFlexible<*>>?) : FlexibleViewHolder(view, adapter),
-        LayoutContainer {
-
-        override val containerView: View?
+    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/exam/ExamItem.kt

@@ -18,8 +18,7 @@ class ExamItem(header: ExamHeader, val exam: Exam) : AbstractSectionableItem<Exa
         return ViewHolder(view, adapter)
     }
 
-    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder,
-                                position: Int, payloads: MutableList<Any>?) {
+    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder, position: Int, payloads: MutableList<Any>?) {
         holder.run {
             examItemSubject.text = exam.subject
             examItemTeacher.text = exam.teacher
@@ -39,12 +38,12 @@ class ExamItem(header: ExamHeader, val exam: Exam) : AbstractSectionableItem<Exa
     }
 
     override fun hashCode(): Int {
-        return exam.hashCode()
+        var result = exam.hashCode()
+        result = 31 * result + exam.id.toInt()
+        return result
     }
 
-    class ViewHolder(view: View, adapter: FlexibleAdapter<*>) : FlexibleViewHolder(view, adapter),
-            LayoutContainer {
-
+    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/grade/GradeFragment.kt

@@ -29,6 +29,8 @@ class GradeFragment : BaseSessionFragment(), GradeView, MainView.MainChildView,
     @Inject
     lateinit var pagerAdapter: BaseFragmentPagerAdapter
 
+    private var semesterSwitchMenu: MenuItem? = null
+
     companion object {
         private const val SAVED_SEMESTER_KEY = "CURRENT_SEMESTER"
 
@@ -57,6 +59,8 @@ class GradeFragment : BaseSessionFragment(), GradeView, MainView.MainChildView,
 
     override fun onCreateOptionsMenu(menu: Menu?, inflater: MenuInflater?) {
         inflater?.inflate(R.menu.action_menu_grade, menu)
+        semesterSwitchMenu = menu?.findItem(R.id.gradeMenuSemester)
+        presenter.onCreateMenu()
     }
 
     override fun initView() {
@@ -75,6 +79,7 @@ class GradeFragment : BaseSessionFragment(), GradeView, MainView.MainChildView,
             setOnSelectPageListener { presenter.onPageSelected(it) }
         }
         gradeTabLayout.setupWithViewPager(gradeViewPager)
+        gradeSwipe.setOnRefreshListener { presenter.onSwipeRefresh() }
     }
 
     override fun onOptionsItemSelected(item: MenuItem?): Boolean {
@@ -95,8 +100,20 @@ class GradeFragment : BaseSessionFragment(), GradeView, MainView.MainChildView,
         gradeProgress.visibility = if (show) VISIBLE else INVISIBLE
     }
 
-    override fun showEmpty() {
-        gradeEmpty.visibility = VISIBLE
+    override fun showEmpty(show: Boolean) {
+        gradeEmpty.visibility = if (show) VISIBLE else INVISIBLE
+    }
+
+    override fun showRefresh(show: Boolean) {
+        gradeSwipe.isRefreshing = show
+    }
+
+    override fun showSemesterSwitch(show: Boolean) {
+        semesterSwitchMenu?.isVisible = show
+    }
+
+    override fun enableSwipe(enable: Boolean) {
+        gradeSwipe.isEnabled = enable
     }
 
     override fun showSemesterDialog(selectedIndex: Int) {

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

@@ -7,9 +7,7 @@ import io.github.wulkanowy.ui.base.session.BaseSessionPresenter
 import io.github.wulkanowy.ui.base.session.SessionErrorHandler
 import io.github.wulkanowy.utils.FirebaseAnalyticsHelper
 import io.github.wulkanowy.utils.SchedulersProvider
-import io.reactivex.Completable
 import timber.log.Timber
-import java.util.concurrent.TimeUnit.MILLISECONDS
 import javax.inject.Inject
 
 class GradePresenter @Inject constructor(
@@ -30,12 +28,16 @@ class GradePresenter @Inject constructor(
     fun onAttachView(view: GradeView, savedIndex: Int?) {
         super.onAttachView(view)
         Timber.i("Grade view is attached")
-        disposable.add(Completable.timer(150, MILLISECONDS, schedulers.mainThread)
-            .subscribe {
-                selectedIndex = savedIndex ?: 0
-                view.initView()
-                loadData()
-            })
+        selectedIndex = savedIndex ?: 0
+        view.run {
+            initView()
+            enableSwipe(false)
+        }
+        loadData()
+    }
+
+    fun onCreateMenu() {
+        if (semesters.isEmpty()) view?.showSemesterSwitch(false)
     }
 
     fun onViewReselected() {
@@ -69,12 +71,17 @@ class GradePresenter @Inject constructor(
         view?.apply {
             showContent(true)
             showProgress(false)
+            showEmpty(false)
             loadedSemesterId[currentPageIndex] = semesterId
         }
     }
 
     fun onPageSelected(index: Int) {
-        loadChild(index)
+        if (semesters.isNotEmpty()) loadChild(index)
+    }
+
+    fun onSwipeRefresh() {
+        loadData()
     }
 
     private fun loadData() {
@@ -89,17 +96,21 @@ class GradePresenter @Inject constructor(
             }
             .subscribeOn(schedulers.backgroundThread)
             .observeOn(schedulers.mainThread)
+            .doFinally { view?.showRefresh(false) }
             .subscribe({
                 view?.run {
                     Timber.i("Loading grade result: Attempt load index $currentPageIndex")
                     loadChild(currentPageIndex)
+                    enableSwipe(false)
+                    showSemesterSwitch(true)
                 }
             }) {
                 Timber.i("Loading grade result: An exception occurred")
                 errorHandler.dispatch(it)
                 view?.run {
                     showProgress(false)
-                    showEmpty()
+                    showEmpty(true)
+                    enableSwipe(true)
                 }
             })
     }

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

@@ -12,10 +12,16 @@ interface GradeView : BaseSessionView {
 
     fun showProgress(show: Boolean)
 
-    fun showEmpty()
+    fun showEmpty(show: Boolean)
+
+    fun showRefresh(show: Boolean)
+
+    fun showSemesterSwitch(show: Boolean)
 
     fun showSemesterDialog(selectedIndex: Int)
 
+    fun enableSwipe(enable: Boolean)
+
     fun notifyChildLoadData(index: Int, semesterId: Int, forceRefresh: Boolean)
 
     fun notifyChildParentReselected(index: Int)

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

@@ -28,10 +28,7 @@ class GradeDetailsItem(
     }
 
     @SuppressLint("SetTextI18n")
-    override fun bindViewHolder(
-        adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder,
-        position: Int, payloads: MutableList<Any>?
-    ) {
+    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder, position: Int, payloads: MutableList<Any>?) {
         holder.run {
             gradeItemValue.run {
                 text = grade.entry
@@ -70,9 +67,7 @@ class GradeDetailsItem(
         return result
     }
 
-    class ViewHolder(view: View, adapter: FlexibleAdapter<*>) : FlexibleViewHolder(view, adapter),
-        LayoutContainer {
-
+    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/grade/statistics/GradeStatisticsPresenter.kt

@@ -63,7 +63,7 @@ class GradeStatisticsPresenter @Inject constructor(
     }
 
     fun onSubjectSelected(name: String) {
-        Timber.i("Select attendance stats subject $name")
+        Timber.i("Select grade stats subject $name")
         view?.run {
             showContent(false)
             showProgress(true)
@@ -77,7 +77,7 @@ class GradeStatisticsPresenter @Inject constructor(
     }
 
     fun onTypeChange(isSemester: Boolean) {
-        Timber.i("Select attendance stats semester: $isSemester")
+        Timber.i("Select grade stats semester: $isSemester")
         disposable.clear()
         view?.run {
             showContent(false)

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

@@ -18,15 +18,12 @@ class GradeSummaryItem(
 
     override fun getLayoutRes() = R.layout.item_grade_summary
 
-    override fun createViewHolder(view: View?, adapter: FlexibleAdapter<IFlexible<*>>?): ViewHolder {
+    override fun createViewHolder(view: View, adapter: FlexibleAdapter<IFlexible<*>>): ViewHolder {
         return ViewHolder(view, adapter)
     }
 
-    override fun bindViewHolder(
-        adapter: FlexibleAdapter<IFlexible<*>>?, holder: ViewHolder?,
-        position: Int, payloads: MutableList<Any>?
-    ) {
-        holder?.run {
+    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder, position: Int, payloads: MutableList<Any>?) {
+        holder.run {
             gradeSummaryItemTitle.text = title
             gradeSummaryItemAverage.text = average
             gradeSummaryItemPredicted.text = predictedGrade
@@ -56,10 +53,8 @@ class GradeSummaryItem(
         return result
     }
 
-    class ViewHolder(view: View?, adapter: FlexibleAdapter<IFlexible<*>>?) : FlexibleViewHolder(view, adapter),
-        LayoutContainer {
-
-        override val containerView: View?
+    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/homework/HomeworkItem.kt

@@ -10,9 +10,8 @@ import io.github.wulkanowy.data.db.entities.Homework
 import kotlinx.android.extensions.LayoutContainer
 import kotlinx.android.synthetic.main.item_homework.*
 
-class HomeworkItem(
-    header: HomeworkHeader, val homework: Homework
-) : AbstractSectionableItem<HomeworkItem.ViewHolder, HomeworkHeader>(header) {
+class HomeworkItem(header: HomeworkHeader, val homework: Homework) :
+    AbstractSectionableItem<HomeworkItem.ViewHolder, HomeworkHeader>(header) {
 
     override fun getLayoutRes() = R.layout.item_homework
 
@@ -20,10 +19,7 @@ class HomeworkItem(
         return ViewHolder(view, adapter)
     }
 
-    override fun bindViewHolder(
-        adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder,
-        position: Int, payloads: MutableList<Any>?
-    ) {
+    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder, position: Int, payloads: MutableList<Any>?) {
         holder.apply {
             homeworkItemSubject.text = homework.subject
             homeworkItemTeacher.text = homework.teacher
@@ -42,12 +38,12 @@ class HomeworkItem(
     }
 
     override fun hashCode(): Int {
-        return homework.hashCode()
+        var result = homework.hashCode()
+        result = 31 * result + homework.id.toInt()
+        return result
     }
 
-    class ViewHolder(val view: View, adapter: FlexibleAdapter<*>) : FlexibleViewHolder(view, adapter),
-        LayoutContainer {
-
+    class ViewHolder(val view: View, adapter: FlexibleAdapter<*>) : FlexibleViewHolder(view, adapter), LayoutContainer {
         override val containerView: View
             get() = contentView
     }

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

@@ -8,19 +8,21 @@ import eu.davidea.viewholders.FlexibleViewHolder
 import io.github.wulkanowy.R
 import io.github.wulkanowy.data.db.entities.Student
 import kotlinx.android.extensions.LayoutContainer
-import kotlinx.android.synthetic.main.item_login_student_select.view.*
+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 createViewHolder(view: View?, adapter: FlexibleAdapter<IFlexible<*>>?): ItemViewHolder {
+    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>?) {
-        holder?.bind(student)
+    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ItemViewHolder, position: Int, payloads: MutableList<Any>?) {
+        holder.run {
+            loginItemName.text = student.studentName
+            loginItemSchool.text = student.schoolName
+        }
     }
 
     override fun equals(other: Any?): Boolean {
@@ -38,17 +40,8 @@ class LoginStudentSelectItem(val student: Student) : AbstractFlexibleItem<LoginS
         return student.hashCode()
     }
 
-    class ItemViewHolder(view: View?, adapter: FlexibleAdapter<*>?)
-        : FlexibleViewHolder(view, adapter), LayoutContainer {
-
-        override val containerView: View?
+    class ItemViewHolder(view: View, adapter: FlexibleAdapter<*>) : FlexibleViewHolder(view, adapter), LayoutContainer {
+        override val containerView: View
             get() = itemView
-
-        fun bind(item: Student) {
-            itemView.run {
-                loginItemName.text = item.studentName
-                loginItemSchool.text = item.schoolName
-            }
-        }
     }
 }

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

@@ -22,7 +22,11 @@ class LuckyNumberPresenter @Inject constructor(
     override fun onAttachView(view: LuckyNumberView) {
         super.onAttachView(view)
         Timber.i("Lucky number view is attached")
-        view.initView()
+        view.run {
+            initView()
+            showContent(false)
+            enableSwipe(false)
+        }
         loadData()
     }
 
@@ -35,12 +39,6 @@ class LuckyNumberPresenter @Inject constructor(
                 .flatMapMaybe { luckyNumberRepository.getLuckyNumber(it, forceRefresh) }
                 .subscribeOn(schedulers.backgroundThread)
                 .observeOn(schedulers.mainThread)
-                .doOnSubscribe {
-                    view?.run {
-                        showContent(false)
-                        enableSwipe(false)
-                    }
-                }
                 .doFinally {
                     view?.run {
                         hideRefresh()

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

@@ -2,7 +2,10 @@ package io.github.wulkanowy.ui.modules.main
 
 import android.content.Context
 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
@@ -68,11 +71,6 @@ class MainActivity : BaseActivity(), MainView {
         return true
     }
 
-    override fun onStart() {
-        super.onStart()
-        presenter.onViewChange()
-    }
-
     override fun initView() {
         mainBottomNav.run {
             addItems(
@@ -144,7 +142,9 @@ class MainActivity : BaseActivity(), MainView {
     }
 
     override fun notifyMenuViewReselected() {
-        (navController.currentStack?.get(0) as? MainView.MainChildView)?.onFragmentReselected()
+        Handler().postDelayed({
+            (navController.currentStack?.get(0) as? MainView.MainChildView)?.onFragmentReselected()
+        }, 250)
     }
 
     fun showDialogFragment(dialog: DialogFragment) {
@@ -165,7 +165,7 @@ class MainActivity : BaseActivity(), MainView {
 
     override fun openLoginView() {
         startActivity(LoginActivity.getStartIntent(this)
-            .apply { addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK or Intent.FLAG_ACTIVITY_NEW_TASK) })
+            .apply { addFlags(FLAG_ACTIVITY_CLEAR_TASK or FLAG_ACTIVITY_NEW_TASK) })
     }
 
     override fun onSaveInstanceState(outState: Bundle?) {

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

@@ -5,7 +5,6 @@ import dagger.Module
 import dagger.Provides
 import dagger.android.ContributesAndroidInjector
 import io.github.wulkanowy.R
-import io.github.wulkanowy.di.scopes.PerActivity
 import io.github.wulkanowy.di.scopes.PerFragment
 import io.github.wulkanowy.ui.modules.about.AboutFragment
 import io.github.wulkanowy.ui.modules.about.AboutModule
@@ -33,7 +32,6 @@ abstract class MainModule {
     companion object {
 
         @JvmStatic
-        @PerActivity
         @Provides
         fun provideFragNavController(activity: MainActivity): FragNavController {
             return FragNavController(activity.supportFragmentManager, R.id.mainFragmentContainer)

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

@@ -24,9 +24,9 @@ class MainPresenter @Inject constructor(
 
     fun onAttachView(view: MainView, initMenuIndex: Int) {
         super.onAttachView(view)
-        Timber.i("Main view is attached with $initMenuIndex menu index")
         view.run {
             startMenuIndex = if (initMenuIndex != -1) initMenuIndex else prefRepository.startMenuIndex
+            Timber.i("Main view is attached with $startMenuIndex menu index")
             initView()
         }
 

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

@@ -20,12 +20,9 @@ class MessageItem(val message: Message, private val noSubjectString: String) :
         return ViewHolder(view, adapter)
     }
 
-    override fun getLayoutRes(): Int = R.layout.item_message
+    override fun getLayoutRes() = R.layout.item_message
 
-    override fun bindViewHolder(
-        adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder,
-        position: Int, payloads: MutableList<Any>?
-    ) {
+    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder, position: Int, payloads: MutableList<Any>?) {
         holder.apply {
             val style = if (message.unread) BOLD else NORMAL
 
@@ -58,9 +55,7 @@ class MessageItem(val message: Message, private val noSubjectString: String) :
         return message.hashCode()
     }
 
-    class ViewHolder(val view: View, adapter: FlexibleAdapter<*>) : FlexibleViewHolder(view, adapter),
-        LayoutContainer {
-
+    class ViewHolder(val view: View, adapter: FlexibleAdapter<*>) : FlexibleViewHolder(view, adapter), LayoutContainer {
         override val containerView: View
             get() = contentView
     }

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

@@ -72,6 +72,10 @@ class SendMessageActivity : BaseActivity(), SendMessageView {
         else false
     }
 
+    override fun onSupportNavigateUp(): Boolean {
+        return presenter.onUpNavigate()
+    }
+
     override fun setReportingUnit(unit: ReportingUnit) {
         sendMessageFromTextView.setText(unit.senderName)
     }

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

@@ -47,6 +47,11 @@ class SendMessagePresenter @Inject constructor(
         }
     }
 
+    fun onUpNavigate(): Boolean {
+        view?.popView()
+        return true
+    }
+
     private fun loadData(message: Message?) {
         var reportingUnit: ReportingUnit? = null
         var recipients: List<Recipient> = emptyList()

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

@@ -14,12 +14,12 @@ class MoreItem(val title: String, private val drawable: Drawable?) : AbstractFle
 
     override fun getLayoutRes() = R.layout.item_more
 
-    override fun createViewHolder(view: View?, adapter: FlexibleAdapter<IFlexible<*>>?): ViewHolder {
+    override fun createViewHolder(view: View, adapter: FlexibleAdapter<IFlexible<*>>): ViewHolder {
         return ViewHolder(view, adapter)
     }
 
-    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>?, holder: ViewHolder?, position: Int, payloads: MutableList<Any>?) {
-        holder?.apply {
+    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder, position: Int, payloads: MutableList<Any>?) {
+        holder.apply {
             moreItemTitle.text = title
             moreItemImage.setImageDrawable(drawable)
         }
@@ -40,9 +40,8 @@ class MoreItem(val title: String, private val drawable: Drawable?) : AbstractFle
         return title.hashCode()
     }
 
-    class ViewHolder(view: View?, adapter: FlexibleAdapter<*>?) : FlexibleViewHolder(view, adapter), LayoutContainer {
-
-        override val containerView: View?
+    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/note/NoteItem.kt

@@ -15,16 +15,13 @@ import kotlinx.android.synthetic.main.item_note.*
 
 class NoteItem(val note: Note) : AbstractFlexibleItem<NoteItem.ViewHolder>() {
 
+    override fun getLayoutRes() = R.layout.item_note
+
     override fun createViewHolder(view: View, adapter: FlexibleAdapter<IFlexible<*>>): NoteItem.ViewHolder {
         return NoteItem.ViewHolder(view, adapter)
     }
 
-    override fun getLayoutRes(): Int = R.layout.item_note
-
-    override fun bindViewHolder(
-        adapter: FlexibleAdapter<IFlexible<*>>,
-        holder: NoteItem.ViewHolder, position: Int, payloads: MutableList<Any>?
-    ) {
+    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: NoteItem.ViewHolder, position: Int, payloads: MutableList<Any>?) {
         holder.apply {
             noteItemDate.apply {
                 text = note.date.toFormattedString()
@@ -57,7 +54,6 @@ class NoteItem(val note: Note) : AbstractFlexibleItem<NoteItem.ViewHolder>() {
     }
 
     class ViewHolder(val view: View, adapter: FlexibleAdapter<*>) : FlexibleViewHolder(view, adapter), LayoutContainer {
-
         override val containerView: View
             get() = contentView
     }

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

@@ -15,18 +15,17 @@ import io.github.wulkanowy.utils.toFormattedString
 import kotlinx.android.extensions.LayoutContainer
 import kotlinx.android.synthetic.main.item_timetable.*
 
-class TimetableItem(val lesson: Timetable, private val roomText: String)
-    : AbstractFlexibleItem<TimetableItem.ViewHolder>() {
+class TimetableItem(val lesson: Timetable, private val roomText: String) :
+    AbstractFlexibleItem<TimetableItem.ViewHolder>() {
 
-    override fun getLayoutRes(): Int = R.layout.item_timetable
+    override fun getLayoutRes() = R.layout.item_timetable
 
     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>?) {
+    override fun bindViewHolder(adapter: FlexibleAdapter<IFlexible<*>>, holder: ViewHolder, position: Int, payloads: MutableList<Any>?) {
         holder.apply {
             timetableItemNumber.text = lesson.number.toString()
             timetableItemSubject.text = lesson.subject
@@ -34,8 +33,8 @@ class TimetableItem(val lesson: Timetable, private val roomText: String)
             timetableItemTime.text = "${lesson.start.toFormattedString("HH:mm")} - ${lesson.end.toFormattedString("HH:mm")}"
             timetableItemAlert.visibility = if (lesson.changes || lesson.canceled) VISIBLE else GONE
             timetableItemSubject.paintFlags =
-                    if (lesson.canceled) timetableItemSubject.paintFlags or Paint.STRIKE_THRU_TEXT_FLAG
-                    else timetableItemSubject.paintFlags and Paint.STRIKE_THRU_TEXT_FLAG.inv()
+                if (lesson.canceled) timetableItemSubject.paintFlags or Paint.STRIKE_THRU_TEXT_FLAG
+                else timetableItemSubject.paintFlags and Paint.STRIKE_THRU_TEXT_FLAG.inv()
         }
     }
 
@@ -50,12 +49,12 @@ class TimetableItem(val lesson: Timetable, private val roomText: String)
     }
 
     override fun hashCode(): Int {
-        return lesson.hashCode()
+        var result = lesson.hashCode()
+        result = 31 * result + lesson.id.toInt()
+        return result
     }
 
-    class ViewHolder(val view: View, adapter: FlexibleAdapter<*>) : FlexibleViewHolder(view, adapter),
-            LayoutContainer {
-
+    class ViewHolder(val view: View, adapter: FlexibleAdapter<*>) : FlexibleViewHolder(view, adapter), LayoutContainer {
         override val containerView: View
             get() = contentView
     }

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

@@ -128,7 +128,7 @@ class TimetablePresenter @Inject constructor(
             clearData()
             showNextButton(!currentDate.plusDays(1).isHolidays)
             showPreButton(!currentDate.minusDays(1).isHolidays)
-            updateNavigationDay(currentDate.toFormattedString("EEEE \n dd.MM.YYYY").capitalize())
+            updateNavigationDay(currentDate.toFormattedString("EEEE\ndd.MM.YYYY").capitalize())
         }
     }
 }

app/src/main/java/io/github/wulkanowy/ui/modules/timetable/completed/CompletedLessonsPresenter.kt

@@ -112,7 +112,7 @@ class CompletedLessonsPresenter @Inject constructor(
             clearData()
             showNextButton(!currentDate.plusDays(1).isHolidays)
             showPreButton(!currentDate.minusDays(1).isHolidays)
-            updateNavigationDay(currentDate.toFormattedString("EEEE \n dd.MM.YYYY").capitalize())
+            updateNavigationDay(currentDate.toFormattedString("EEEE\ndd.MM.YYYY").capitalize())
         }
     }
 }

app/src/main/java/io/github/wulkanowy/ui/widgets/timetable/TimetableWidgetFactory.kt

@@ -17,6 +17,7 @@ import io.github.wulkanowy.data.repositories.student.StudentRepository
 import io.github.wulkanowy.data.repositories.timetable.TimetableRepository
 import io.github.wulkanowy.utils.SchedulersProvider
 import io.github.wulkanowy.utils.toFormattedString
+import io.reactivex.Single
 import org.threeten.bp.LocalDate
 import timber.log.Timber
 
@@ -51,9 +52,13 @@ class TimetableWidgetFactory(
             ?.let { date ->
                 try {
                     lessons = studentRepository.isStudentSaved()
-                        .flatMap { studentRepository.getCurrentStudent() }
-                        .flatMap { semesterRepository.getCurrentSemester(it) }
-                        .flatMap { timetableRepository.getTimetable(it, date, date) }
+                        .flatMap { isSaved ->
+                            if (isSaved) {
+                                studentRepository.getCurrentStudent()
+                                    .flatMap { semesterRepository.getCurrentSemester(it) }
+                                    .flatMap { timetableRepository.getTimetable(it, date, date) }
+                            } else Single.just(emptyList())
+                        }
                         .map { item -> item.sortedBy { it.number } }
                         .subscribeOn(schedulers.backgroundThread)
                         .blockingGet()

app/src/main/java/io/github/wulkanowy/ui/widgets/timetable/TimetableWidgetProvider.kt

@@ -62,7 +62,7 @@ class TimetableWidgetProvider : BroadcastReceiver() {
 
     private fun onUpdate(context: Context, intent: Intent) {
         if (intent.getStringExtra(EXTRA_BUTTON_TYPE) === null) {
-            intent.getIntArrayExtra(EXTRA_APPWIDGET_IDS).forEach { appWidgetId ->
+            intent.getIntArrayExtra(EXTRA_APPWIDGET_IDS)?.forEach { appWidgetId ->
                 updateWidget(context, appWidgetId, now().nextOrSameSchoolDay)
             }
         } else {
@@ -95,7 +95,7 @@ class TimetableWidgetProvider : BroadcastReceiver() {
                 .apply { action = createWidgetKey(appWidgetId) })
             setOnClickPendingIntent(R.id.timetableWidgetNext, createNavIntent(context, appWidgetId, appWidgetId, BUTTON_NEXT))
             setOnClickPendingIntent(R.id.timetableWidgetPrev, createNavIntent(context, -appWidgetId, appWidgetId, BUTTON_PREV))
-            createNavIntent(context, Int.MAX_VALUE, appWidgetId, BUTTON_RESET).also {
+            createNavIntent(context, Int.MAX_VALUE - appWidgetId, appWidgetId, BUTTON_RESET).also {
                 setOnClickPendingIntent(R.id.timetableWidgetDate, it)
                 setOnClickPendingIntent(R.id.timetableWidgetDay, it)
             }

app/src/main/play/release-notes/pl-PL/default.txt

@@ -1,20 +1,6 @@
-Wersja 0.7.0
-
-Dodaliśmy:
-- szczęśliwy numerek
-- lekcje zrealizowane
-- wysyłanie wiadomości
-- ucznia na tle klasy
-- opcję zmiany kolorów ocen
-
-Zmieniliśmy:
-- wygląd ekranu logowania
-- sposób wyświetlania zastępstw
-- widok zadań domowych na tygodniowy
+Wersja 0.7.3
 
 Naprawiliśmy:
-- automatyczne przełączanie widżetu na nowy dzień
-- wyświetlanie powiadomień o starych ocenach
-- znikające numery sal w planie lekcji
+- naprawiono problemy ze stabilnością podczas odświeżania danych
 
-Pełna lista zmian: https://github.com/wulkanowy/wulkanowy/releases/tag/0.7.0
+Pełna lista zmian: https://github.com/wulkanowy/wulkanowy/releases/tag/0.7.3

app/src/main/res/layout/fragment_grade.xml

@@ -17,13 +17,19 @@
         app:tabTextColor="@android:color/white"
         tools:visibility="visible" />
 
-    <androidx.viewpager.widget.ViewPager
-        android:id="@+id/gradeViewPager"
+    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
+        android:id="@+id/gradeSwipe"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:layout_marginTop="48dp"
-        android:visibility="invisible"
-        tools:visibility="visible" />
+        android:layout_marginTop="48dp">
+
+        <androidx.viewpager.widget.ViewPager
+            android:id="@+id/gradeViewPager"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:visibility="invisible"
+            tools:visibility="visible" />
+    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
 
     <ProgressBar
         android:id="@+id/gradeProgress"

app/src/test/java/io/github/wulkanowy/data/repositories/UnitTestInternetObservingStrategy.kt

@@ -0,0 +1,19 @@
+package io.github.wulkanowy.data.repositories
+
+import com.github.pwittchen.reactivenetwork.library.rx2.internet.observing.InternetObservingStrategy
+import com.github.pwittchen.reactivenetwork.library.rx2.internet.observing.error.ErrorHandler
+import io.reactivex.Observable
+import io.reactivex.Single
+
+class UnitTestInternetObservingStrategy : InternetObservingStrategy {
+
+    override fun checkInternetConnectivity(host: String?, port: Int, timeoutInMs: Int, httpResponse: Int, errorHandler: ErrorHandler?): Single<Boolean> {
+        return Single.just(true)
+    }
+
+    override fun observeInternetConnectivity(initialIntervalInMs: Int, intervalInMs: Int, host: String?, port: Int, timeoutInMs: Int, httpResponse: Int, errorHandler: ErrorHandler?): Observable<Boolean> {
+        return Observable.just(true)
+    }
+
+    override fun getDefaultPingHost() = "localhost"
+}

app/src/test/java/io/github/wulkanowy/data/repositories/attendance/AttendanceRemoteTest.kt

@@ -1,9 +1,8 @@
-package io.github.wulkanowy.data.repositories.remote
+package io.github.wulkanowy.data.repositories.attendance
 
 import io.github.wulkanowy.api.Api
 import io.github.wulkanowy.api.attendance.Attendance
 import io.github.wulkanowy.data.db.entities.Semester
-import io.github.wulkanowy.data.repositories.attendance.AttendanceRemote
 import io.mockk.MockKAnnotations
 import io.mockk.every
 import io.mockk.impl.annotations.MockK

app/src/test/java/io/github/wulkanowy/data/repositories/completedlessons/CompletedLessonsRemoteTest.kt

@@ -1,9 +1,8 @@
-package io.github.wulkanowy.data.repositories.remote
+package io.github.wulkanowy.data.repositories.completedlessons
 
 import io.github.wulkanowy.api.Api
 import io.github.wulkanowy.api.timetable.CompletedLesson
 import io.github.wulkanowy.data.db.entities.Semester
-import io.github.wulkanowy.data.repositories.completedlessons.CompletedLessonsRemote
 import io.mockk.MockKAnnotations
 import io.mockk.every
 import io.mockk.impl.annotations.MockK

app/src/test/java/io/github/wulkanowy/data/repositories/exam/ExamRemoteTest.kt

@@ -1,9 +1,8 @@
-package io.github.wulkanowy.data.repositories.remote
+package io.github.wulkanowy.data.repositories.exam
 
 import io.github.wulkanowy.api.Api
 import io.github.wulkanowy.api.exams.Exam
 import io.github.wulkanowy.data.db.entities.Semester
-import io.github.wulkanowy.data.repositories.exam.ExamRemote
 import io.mockk.MockKAnnotations
 import io.mockk.every
 import io.mockk.impl.annotations.MockK

app/src/test/java/io/github/wulkanowy/data/repositories/gradestatistics/GradeStatisticsRemoteTest.kt

@@ -1,9 +1,8 @@
-package io.github.wulkanowy.data.repositories.remote
+package io.github.wulkanowy.data.repositories.gradestatistics
 
 import io.github.wulkanowy.api.Api
 import io.github.wulkanowy.api.grades.GradeStatistics
 import io.github.wulkanowy.data.db.entities.Semester
-import io.github.wulkanowy.data.repositories.gradestatistics.GradeStatisticsRemote
 import io.mockk.MockKAnnotations
 import io.mockk.every
 import io.mockk.impl.annotations.MockK

app/src/test/java/io/github/wulkanowy/data/repositories/luckynumber/LuckyNumberRemoteTest.kt

@@ -1,4 +1,4 @@
-package io.github.wulkanowy.data.repositories.remote
+package io.github.wulkanowy.data.repositories.luckynumber
 
 import io.github.wulkanowy.api.Api
 import io.github.wulkanowy.data.db.entities.Semester

app/src/test/java/io/github/wulkanowy/data/repositories/semester/SemesterRepositoryTest.kt

@@ -0,0 +1,74 @@
+package io.github.wulkanowy.data.repositories.semester
+
+import com.github.pwittchen.reactivenetwork.library.rx2.internet.observing.InternetObservingSettings
+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.data.repositories.UnitTestInternetObservingStrategy
+import io.reactivex.Maybe
+import io.reactivex.Single
+import org.junit.Before
+import org.junit.Test
+import org.mockito.Mock
+import org.mockito.Mockito.doNothing
+import org.mockito.Mockito.doReturn
+import org.mockito.Mockito.verify
+import org.mockito.MockitoAnnotations
+
+class SemesterRepositoryTest {
+
+    @Mock
+    private lateinit var semesterRemote: SemesterRemote
+
+    @Mock
+    private lateinit var semesterLocal: SemesterLocal
+
+    @Mock
+    private lateinit var apiHelper: ApiHelper
+
+    @Mock
+    private lateinit var student: Student
+
+    private lateinit var semesterRepository: SemesterRepository
+
+    private val settings = InternetObservingSettings.builder()
+        .strategy(UnitTestInternetObservingStrategy())
+        .build()
+
+    @Before
+    fun initTest() {
+        MockitoAnnotations.initMocks(this)
+        semesterRepository = SemesterRepository(semesterRemote, semesterLocal, settings, apiHelper)
+    }
+
+    @Test
+    fun singleCurrentSemesterTest() {
+        val semesters = listOf(
+            createSemesterEntity(false),
+            createSemesterEntity(true)
+        )
+
+        doNothing().`when`(apiHelper).initApi(student)
+        doReturn(Maybe.empty<Semester>()).`when`(semesterLocal).getSemesters(student)
+        doReturn(Single.just(semesters)).`when`(semesterRemote).getSemesters(student)
+
+        semesterRepository.getSemesters(student).blockingGet()
+
+        verify(semesterLocal).deleteSemesters(emptyList())
+        verify(semesterLocal).saveSemesters(semesters)
+    }
+
+    @Test(expected = IllegalArgumentException::class)
+    fun twoCurrentSemesterTest() {
+        val semesters = listOf(
+            createSemesterEntity(true),
+            createSemesterEntity(true)
+        )
+
+        doNothing().`when`(apiHelper).initApi(student)
+        doReturn(Maybe.empty<Semester>()).`when`(semesterLocal).getSemesters(student)
+        doReturn(Single.just(semesters)).`when`(semesterRemote).getSemesters(student)
+
+        semesterRepository.getSemesters(student).blockingGet()
+    }
+}

app/src/test/java/io/github/wulkanowy/data/repositories/semester/TestSemesterEnityCreator.kt

@@ -0,0 +1,16 @@
+package io.github.wulkanowy.data.repositories.semester
+
+import io.github.wulkanowy.data.db.entities.Semester
+
+fun createSemesterEntity(current: Boolean): Semester {
+    return Semester(
+        studentId = 0,
+        diaryId = 0,
+        semesterId = 0,
+        diaryName = "",
+        classId = 0,
+        isCurrent = current,
+        semesterName = 0,
+        unitId = 0
+    )
+}

app/src/test/java/io/github/wulkanowy/data/repositories/student/StudentRemoteTest.kt

@@ -1,8 +1,7 @@
-package io.github.wulkanowy.data.repositories.remote
+package io.github.wulkanowy.data.repositories.student
 
 import io.github.wulkanowy.api.Api
 import io.github.wulkanowy.api.register.Student
-import io.github.wulkanowy.data.repositories.student.StudentRemote
 import io.reactivex.Single
 import org.junit.Assert.assertEquals
 import org.junit.Before

app/src/test/java/io/github/wulkanowy/data/repositories/timetable/TimetableRemoteTest.kt

@@ -1,4 +1,4 @@
-package io.github.wulkanowy.data.repositories.remote
+package io.github.wulkanowy.data.repositories.timetable
 
 import io.github.wulkanowy.api.Api
 import io.github.wulkanowy.api.timetable.Timetable

app/src/test/java/io/github/wulkanowy/utils/GradeExtensionTest.kt

@@ -22,11 +22,11 @@ class GradeExtensionTest {
     @Test
     fun calcWeightedAverage() {
         assertEquals(3.47, listOf(
-            createGrade(5, 6, 0.33),
-            createGrade(5, 5, -0.33),
-            createGrade(4, 1, 0.0),
-            createGrade(1, 9, 0.5),
-            createGrade(0, 0, 0.0)
+            createGrade(5, 6.0, 0.33),
+            createGrade(5, 5.0, -0.33),
+            createGrade(4, 1.0, 0.0),
+            createGrade(1, 9.0, 0.5),
+            createGrade(0, .0, 0.0)
         ).calcAverage(), 0.005)
     }
 
@@ -42,23 +42,23 @@ class GradeExtensionTest {
 
     @Test
     fun changeModifier_default() {
-        assertEquals(.33, createGrade(5, 0, .33).changeModifier(.0, .0).modifier, .0)
-        assertEquals(-.33, createGrade(5, 0, -.33).changeModifier(.0, .0).modifier, .0)
+        assertEquals(.33, createGrade(5, .0, .33).changeModifier(.0, .0).modifier, .0)
+        assertEquals(-.33, createGrade(5, .0, -.33).changeModifier(.0, .0).modifier, .0)
     }
 
     @Test
     fun changeModifier_plus() {
-        assertEquals(.33, createGrade(5, 0, .25).changeModifier(.33, .50).modifier, .0)
-        assertEquals(.25, createGrade(5, 0, .33).changeModifier(.25, .0).modifier, .0)
+        assertEquals(.33, createGrade(5, .0, .25).changeModifier(.33, .50).modifier, .0)
+        assertEquals(.25, createGrade(5, .0, .33).changeModifier(.25, .0).modifier, .0)
     }
 
     @Test
     fun changeModifier_minus() {
-        assertEquals(-.33, createGrade(5, 0, -.25).changeModifier(.25, .33).modifier, .0)
-        assertEquals(-.25, createGrade(5, 0, -.33).changeModifier(.0, .25).modifier, .0)
+        assertEquals(-.33, createGrade(5, .0, -.25).changeModifier(.25, .33).modifier, .0)
+        assertEquals(-.25, createGrade(5, .0, -.33).changeModifier(.0, .25).modifier, .0)
     }
 
-    private fun createGrade(value: Int, weightValue: Int = 0, modifier: Double = 0.25): Grade {
+    private fun createGrade(value: Int, weightValue: Double = .0, modifier: Double = 0.25): Grade {
         return Grade(
             semesterId = 1,
             studentId = 1,