mid commit

android/app/build.gradle.kts

@@ -4,6 +4,7 @@ plugins {
     alias(libs.plugins.kotlin.compose)  // v1.5.0: Jetpack Compose Compiler
     alias(libs.plugins.ktlint)  // ✅ v1.6.1: Reaktiviert nach Code-Cleanup
     alias(libs.plugins.detekt)
+    alias(libs.plugins.ksp)
 }
 
 import java.util.Properties
@@ -162,6 +163,15 @@ dependencies {
     implementation(libs.androidx.lifecycle.runtime.compose)
     debugImplementation(libs.androidx.compose.ui.tooling)
 
+    // Koin
+    implementation(libs.koin.android)
+    implementation(libs.koin.androidx.compose)
+
+    // Room
+    implementation(libs.room.runtime)
+    implementation(libs.room.ktx)
+    ksp(libs.room.compiler)
+
     // ═══════════════════════════════════════════════════════════════════════
     // 🆕 v1.8.0: Homescreen Widgets
     // ═══════════════════════════════════════════════════════════════════════

android/app/src/main/java/dev/dettmer/simplenotes/MainActivity.kt

@@ -36,8 +36,6 @@ import android.widget.CheckBox
 import android.widget.Toast
 import androidx.lifecycle.lifecycleScope
 import kotlinx.coroutines.launch
-import androidx.lifecycle.lifecycleScope
-import kotlinx.coroutines.launch
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import dev.dettmer.simplenotes.sync.WebDavSyncService

android/app/src/main/java/dev/dettmer/simplenotes/SimpleNotesApplication.kt

@@ -6,6 +6,10 @@ import dev.dettmer.simplenotes.utils.Logger
 import dev.dettmer.simplenotes.sync.NetworkMonitor
 import dev.dettmer.simplenotes.utils.NotificationHelper
 import dev.dettmer.simplenotes.utils.Constants
+import dev.dettmer.simplenotes.di.appModule
+import org.koin.android.ext.koin.androidContext
+import org.koin.android.ext.koin.androidLogger
+import org.koin.core.context.startKoin
 
 class SimpleNotesApplication : Application() {
 
@@ -30,6 +34,12 @@ class SimpleNotesApplication : Application() {
     override fun onCreate() {
         super.onCreate()
 
+        startKoin {
+            androidLogger() // Log Koin events
+            androidContext(this@SimpleNotesApplication) // Provide context to modules
+            modules(appModule)
+        }
+
         val prefs = getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
 
         // 🔧 Hotfix v1.6.2: Migrate offline mode setting BEFORE any ViewModel initialization

android/app/src/main/java/dev/dettmer/simplenotes/di/AppModule.kt

@@ -0,0 +1,33 @@
+package dev.dettmer.simplenotes.di
+
+import android.content.Context
+import androidx.room.Room
+import dev.dettmer.simplenotes.storage.AppDatabase
+import dev.dettmer.simplenotes.storage.NotesStorage
+import dev.dettmer.simplenotes.ui.main.MainViewModel
+import dev.dettmer.simplenotes.utils.Constants
+import org.koin.android.ext.koin.androidContext
+import org.koin.androidx.viewmodel.dsl.viewModel
+import org.koin.dsl.module
+
+val appModule = module {
+    single {
+        Room.databaseBuilder(
+            androidContext(),
+            AppDatabase::class.java,
+            "notes_database"
+        ).build()
+    }
+
+    single { get<AppDatabase>().noteDao() }
+    single { get<AppDatabase>().deletedNoteDao() }
+
+    // Provide SharedPreferences
+    single {
+        androidContext().getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
+    }
+
+    single { NotesStorage(androidContext(), get()) }
+
+    viewModel { MainViewModel(get(), get()) }
+}

android/app/src/main/java/dev/dettmer/simplenotes/storage/AppDatabase.kt

@@ -0,0 +1,14 @@
+package dev.dettmer.simplenotes.storage
+
+import androidx.room.Database
+import androidx.room.RoomDatabase
+import dev.dettmer.simplenotes.storage.dao.DeletedNoteDao
+import dev.dettmer.simplenotes.storage.dao.NoteDao
+import dev.dettmer.simplenotes.storage.entity.DeletedNoteEntity
+import dev.dettmer.simplenotes.storage.entity.NoteEntity
+
+@Database(entities = [NoteEntity::class, DeletedNoteEntity::class], version = 1)
+abstract class AppDatabase : RoomDatabase() {
+    abstract fun noteDao(): NoteDao
+    abstract fun deletedNoteDao(): DeletedNoteDao
+}

android/app/src/main/java/dev/dettmer/simplenotes/storage/NotesStorage.kt

@@ -1,76 +1,58 @@
 package dev.dettmer.simplenotes.storage
 
 import android.content.Context
-import dev.dettmer.simplenotes.models.DeletionTracker
-import dev.dettmer.simplenotes.models.Note
+import dev.dettmer.simplenotes.models.SyncStatus
+import dev.dettmer.simplenotes.storage.entity.DeletedNoteEntity
+import dev.dettmer.simplenotes.storage.entity.NoteEntity
 import dev.dettmer.simplenotes.utils.DeviceIdGenerator
 import dev.dettmer.simplenotes.utils.Logger
-import kotlinx.coroutines.sync.Mutex
-import kotlinx.coroutines.sync.withLock
-import java.io.File
 
-class NotesStorage(private val context: Context) {
+class NotesStorage(
+    private val context: Context,
+    database: AppDatabase
+) {
 
     companion object {
         private const val TAG = "NotesStorage"
-        // 🔒 v1.7.2 (IMPL_001): Mutex für thread-sichere Deletion Tracker Operationen
-        private val deletionTrackerMutex = Mutex()
     }
 
-    private val notesDir: File = File(context.filesDir, "notes").apply {
-        if (!exists()) mkdirs()
+    private val noteDao = database.noteDao()
+    private val deletedNoteDao = database.deletedNoteDao()
+
+    suspend fun saveNote(note: NoteEntity) {
+        noteDao.saveNote(note)
     }
 
-    fun saveNote(note: Note) {
-        val file = File(notesDir, "${note.id}.json")
-        file.writeText(note.toJson())
+    suspend fun loadNote(id: String): NoteEntity? {
+        return noteDao.getNote(id)
     }
 
-    fun loadNote(id: String): Note? {
-        val file = File(notesDir, "$id.json")
-        return if (file.exists()) {
-            Note.fromJson(file.readText())
-        } else {
-            null
-        }
+    suspend fun loadAllNotes(): List<NoteEntity> {
+        return noteDao.getAllNotes()
     }
 
-    /**
-     * Lädt alle Notizen aus dem lokalen Speicher.
-     * 
-     * 🔀 v1.8.0: Sortierung entfernt — wird jetzt im ViewModel durchgeführt,
-     * damit der User die Sortierung konfigurieren kann.
-     */
-    fun loadAllNotes(): List<Note> {
-        return notesDir.listFiles()
-            ?.filter { it.extension == "json" }
-            ?.mapNotNull { Note.fromJson(it.readText()) }
-            ?: emptyList()
-    }
+    suspend fun deleteNote(id: String): Boolean {
+        val deletedRows = noteDao.deleteNoteById(id)
 
-    fun deleteNote(id: String): Boolean {
-        val file = File(notesDir, "$id.json")
-        val deleted = file.delete()
-        
-        if (deleted) {
+        if (deletedRows > 0) {
             Logger.d(TAG, "🗑️ Deleted note: $id")
-            
-            // Track deletion to prevent zombie notes
             val deviceId = DeviceIdGenerator.getDeviceId(context)
-            trackDeletion(id, deviceId)
+            trackDeletionSafe(id, deviceId)
+            return true
+        }
+        return false
     }
 
-        return deleted
-    }
-    
-    fun deleteAllNotes(): Boolean {
+    suspend fun deleteAllNotes(): Boolean {
         return try {
             val notes = loadAllNotes()
             val deviceId = DeviceIdGenerator.getDeviceId(context)
 
-            for (note in notes) {
-                deleteNote(note.id)  // Uses trackDeletion() automatically
+            // Batch tracking and deleting
+            notes.forEach { note ->
+                trackDeletionSafe(note.id, deviceId)
             }
+            noteDao.deleteAllNotes()
 
             Logger.d(TAG, "🗑️ Deleted all notes (${notes.size} notes)")
             true
@@ -82,101 +64,28 @@ class NotesStorage(private val context: Context) {
 
     // === Deletion Tracking ===
 
-    private fun getDeletionTrackerFile(): File {
-        return File(context.filesDir, "deleted_notes.json")
-    }
-    
-    fun loadDeletionTracker(): DeletionTracker {
-        val file = getDeletionTrackerFile()
-        if (!file.exists()) {
-            return DeletionTracker()
-        }
-        
-        return try {
-            val json = file.readText()
-            DeletionTracker.fromJson(json) ?: DeletionTracker()
-        } catch (e: Exception) {
-            Logger.e(TAG, "Failed to load deletion tracker", e)
-            DeletionTracker()
-        }
-    }
-    
-    fun saveDeletionTracker(tracker: DeletionTracker) {
-        try {
-            val file = getDeletionTrackerFile()
-            file.writeText(tracker.toJson())
-            
-            if (tracker.deletedNotes.size > 1000) {
-                Logger.w(TAG, "⚠️ Deletion tracker large: ${tracker.deletedNotes.size} entries")
-            }
-            
-            Logger.d(TAG, "✅ Deletion tracker saved (${tracker.deletedNotes.size} entries)")
-        } catch (e: Exception) {
-            Logger.e(TAG, "Failed to save deletion tracker", e)
-        }
-    }
-    
-    /**
-     * 🔒 v1.7.2 (IMPL_001): Thread-sichere Deletion-Tracking mit Mutex
-     * 
-     * Verhindert Race Conditions bei Batch-Deletes durch exklusiven Zugriff
-     * auf den Deletion Tracker.
-     * 
-     * @param noteId ID der gelöschten Notiz
-     * @param deviceId Geräte-ID für Konflikt-Erkennung
-     */
     suspend fun trackDeletionSafe(noteId: String, deviceId: String) {
-        deletionTrackerMutex.withLock {
-            val tracker = loadDeletionTracker()
-            tracker.addDeletion(noteId, deviceId)
-            saveDeletionTracker(tracker)
-            Logger.d(TAG, "📝 Tracked deletion (mutex-protected): $noteId")
-        }
-    }
-    
-    /**
-     * Legacy-Methode ohne Mutex-Schutz.
-     * Verwendet für synchrone Aufrufe wo Coroutines nicht verfügbar sind.
-     * 
-     * @deprecated Verwende trackDeletionSafe() für Thread-Safety wo möglich
-     */
-    fun trackDeletion(noteId: String, deviceId: String) {
-        val tracker = loadDeletionTracker()
-        tracker.addDeletion(noteId, deviceId)
-        saveDeletionTracker(tracker)
+        // Room handles internal transactions and thread-safety natively.
+        // The Mutex is no longer required.
+        deletedNoteDao.trackDeletion(DeletedNoteEntity(noteId, deviceId))
         Logger.d(TAG, "📝 Tracked deletion: $noteId")
     }
 
-    fun isNoteDeleted(noteId: String): Boolean {
-        val tracker = loadDeletionTracker()
-        return tracker.isDeleted(noteId)
+    suspend fun isNoteDeleted(noteId: String): Boolean {
+        return deletedNoteDao.isNoteDeleted(noteId)
     }
 
-    fun clearDeletionTracker() {
-        saveDeletionTracker(DeletionTracker())
+    suspend fun clearDeletionTracker() {
+        deletedNoteDao.clearTracker()
         Logger.d(TAG, "🗑️ Deletion tracker cleared")
     }
 
-    /**
-     * 🔄 v1.7.0: Reset all sync statuses to PENDING when server changes
-     * This ensures notes are uploaded to the new server on next sync
-     */
-    fun resetAllSyncStatusToPending(): Int {
-        val notes = loadAllNotes()
-        var updatedCount = 0
-        
-        notes.forEach { note ->
-            if (note.syncStatus == dev.dettmer.simplenotes.models.SyncStatus.SYNCED) {
-                val updatedNote = note.copy(syncStatus = dev.dettmer.simplenotes.models.SyncStatus.PENDING)
-                saveNote(updatedNote)
-                updatedCount++
-            }
-        }
-        
+    suspend fun resetAllSyncStatusToPending(): Int {
+        val updatedCount = noteDao.updateSyncStatus(
+            oldStatus = SyncStatus.SYNCED,
+            newStatus = SyncStatus.PENDING
+        )
         Logger.d(TAG, "🔄 Reset sync status for $updatedCount notes to PENDING")
         return updatedCount
     }
-
-    
-    fun getNotesDir(): File = notesDir
 }

android/app/src/main/java/dev/dettmer/simplenotes/storage/dao/DeletedNoteDao.kt

@@ -0,0 +1,19 @@
+package dev.dettmer.simplenotes.storage.dao
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import dev.dettmer.simplenotes.storage.entity.DeletedNoteEntity
+
+@Dao
+interface DeletedNoteDao {
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun trackDeletion(deletedNote: DeletedNoteEntity)
+
+    @Query("SELECT EXISTS(SELECT 1 FROM deleted_notes WHERE noteId = :noteId)")
+    suspend fun isNoteDeleted(noteId: String): Boolean
+
+    @Query("DELETE FROM deleted_notes")
+    suspend fun clearTracker()
+}

android/app/src/main/java/dev/dettmer/simplenotes/storage/dao/NoteDao.kt

@@ -0,0 +1,29 @@
+package dev.dettmer.simplenotes.storage.dao
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import dev.dettmer.simplenotes.models.SyncStatus
+import dev.dettmer.simplenotes.storage.entity.NoteEntity
+
+@Dao
+interface NoteDao {
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun saveNote(note: NoteEntity)
+
+    @Query("SELECT * FROM notes WHERE id = :id")
+    suspend fun getNote(id: String): NoteEntity?
+
+    @Query("SELECT * FROM notes")
+    suspend fun getAllNotes(): List<NoteEntity>
+
+    @Query("DELETE FROM notes WHERE id = :id")
+    suspend fun deleteNoteById(id: String): Int
+
+    @Query("DELETE FROM notes")
+    suspend fun deleteAllNotes(): Int
+
+    @Query("UPDATE notes SET syncStatus = :newStatus WHERE syncStatus = :oldStatus")
+    suspend fun updateSyncStatus(oldStatus: SyncStatus, newStatus: SyncStatus): Int
+}

android/app/src/main/java/dev/dettmer/simplenotes/storage/entity/DeletedNoteEntity.kt

@@ -0,0 +1,11 @@
+package dev.dettmer.simplenotes.storage.entity
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "deleted_notes")
+data class DeletedNoteEntity(
+    @PrimaryKey val noteId: String,
+    val deviceId: String,
+    val deletedAt: Long = System.currentTimeMillis()
+)

android/app/src/main/java/dev/dettmer/simplenotes/storage/entity/NoteEntity.kt

@@ -0,0 +1,13 @@
+package dev.dettmer.simplenotes.storage.entity
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+import dev.dettmer.simplenotes.models.SyncStatus
+
+@Entity(tableName = "notes")
+data class NoteEntity(
+    @PrimaryKey val id: String,
+    val content: String,
+    val timestamp: Long,
+    val syncStatus: SyncStatus
+)

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/ComposeMainActivity.kt

@@ -44,6 +44,7 @@ import dev.dettmer.simplenotes.utils.Constants
 import dev.dettmer.simplenotes.utils.Logger
 import dev.dettmer.simplenotes.utils.NotificationHelper
 import kotlinx.coroutines.launch
+import org.koin.androidx.viewmodel.ext.android.viewModel
 
 /**
  * Main Activity with Jetpack Compose UI
@@ -65,7 +66,7 @@ class ComposeMainActivity : ComponentActivity() {
         private const val REQUEST_SETTINGS = 1002
     }
 
-    private val viewModel: MainViewModel by viewModels()
+    private val viewModel: MainViewModel by viewModel()
 
     private val prefs by lazy {
         getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/MainScreen.kt

@@ -59,6 +59,7 @@ import dev.dettmer.simplenotes.ui.main.components.NotesStaggeredGrid
 import dev.dettmer.simplenotes.ui.main.components.SyncProgressBanner
 import dev.dettmer.simplenotes.ui.main.components.SyncStatusLegendDialog
 import kotlinx.coroutines.launch
+import org.koin.androidx.compose.koinViewModel
 
 private const val TIMESTAMP_UPDATE_INTERVAL_MS = 30_000L
 
@@ -74,7 +75,7 @@ private const val TIMESTAMP_UPDATE_INTERVAL_MS = 30_000L
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun MainScreen(
-    viewModel: MainViewModel,
+    viewModel: MainViewModel = koinViewModel(),
     onOpenNote: (String?) -> Unit,
     onOpenSettings: () -> Unit,
     onCreateNote: (NoteType) -> Unit

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/MainViewModel.kt

@@ -2,7 +2,9 @@ package dev.dettmer.simplenotes.ui.main
 
 import android.app.Application
 import android.content.Context
+import android.content.SharedPreferences
 import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import dev.dettmer.simplenotes.models.Note
 import dev.dettmer.simplenotes.models.SortDirection
@@ -34,7 +36,10 @@ import kotlinx.coroutines.withContext
  *
  * Manages notes list, sync state, and deletion with undo.
  */
-class MainViewModel(application: Application) : AndroidViewModel(application) {
+class MainViewModel(
+    private val storage: NotesStorage,
+    private val prefs: SharedPreferences
+) : ViewModel() {
 
     companion object {
         private const val TAG = "MainViewModel"
@@ -42,9 +47,6 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
         private const val PREF_LAST_AUTO_SYNC_TIME = "last_auto_sync_timestamp"
     }
 
-    private val storage = NotesStorage(application)
-    private val prefs = application.getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
-    
     // ═══════════════════════════════════════════════════════════════════════
     // Notes State
     // ═══════════════════════════════════════════════════════════════════════
@@ -207,7 +209,10 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
     private suspend fun loadNotesAsync() {
         val allNotes = storage.loadAllNotes()
         val pendingIds = _pendingDeletions.value
-        val filteredNotes = allNotes.filter { it.id !in pendingIds }
+        val filteredNotes = allNotes.filter { it.id !in pendingIds }.map { Note(
+            id = it.id,
+            content = it.content
+        ) }
 
         withContext(Dispatchers.Main) {
             // Phase 3: Detect if a new note was added at the top

android/app/src/test/java/dev/dettmer/simplenotes/ExampleUnitTest.kt

@@ -1,17 +0,0 @@
-package dev.dettmer.simplenotes
-
-import org.junit.Test
-
-import org.junit.Assert.*
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-class ExampleUnitTest {
-    @Test
-    fun addition_isCorrect() {
-        assertEquals(4, 2 + 2)
-    }
-}

android/gradle/libs.versions.toml

@@ -16,6 +16,9 @@ composeBom = "2026.01.00"
 navigationCompose = "2.7.6"
 lifecycleRuntimeCompose = "2.7.0"
 activityCompose = "1.8.2"
+room = "2.6.1"
+ksp = "2.0.0-1.0.21"
+koin = "3.5.3"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
@@ -37,6 +40,14 @@ androidx-compose-material-icons = { group = "androidx.compose.material", name =
 androidx-activity-compose = { group = "androidx.activity", name = "activity-compose", version.ref = "activityCompose" }
 androidx-navigation-compose = { group = "androidx.navigation", name = "navigation-compose", version.ref = "navigationCompose" }
 androidx-lifecycle-runtime-compose = { group = "androidx.lifecycle", name = "lifecycle-runtime-compose", version.ref = "lifecycleRuntimeCompose" }
+# Room Database
+room-runtime = { group = "androidx.room", name = "room-runtime", version.ref = "room" }
+room-ktx = { group = "androidx.room", name = "room-ktx", version.ref = "room" }
+room-compiler = { group = "androidx.room", name = "room-compiler", version.ref = "room" }
+# Core Koin for Kotlin projects
+koin-android = { group = "io.insert-koin", name = "koin-android", version.ref = "koin" }
+# Koin for Jetpack Compose integration
+koin-androidx-compose = { group = "io.insert-koin", name = "koin-androidx-compose", version.ref = "koin" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }
@@ -44,4 +55,5 @@ kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
 kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
 ktlint = { id = "org.jlleitschuh.gradle.ktlint", version.ref = "ktlint" }
 detekt = { id = "io.gitlab.arturbosch.detekt", version.ref = "detekt" }
+ksp = { id = "com.google.devtools.ksp", version.ref = "ksp" }