temporal abyss

app/build.gradle.kts

@@ -67,6 +67,8 @@ dependencies {
     implementation(libs.androidx.media3.session)
     implementation(libs.androidx.room.runtime)
     implementation(libs.com.google.devtools.ksp.gradle.plugin)
+    implementation(libs.kotlinx.coroutines.android)
+    implementation(libs.androidx.room.ktx)
 
     ksp(libs.androidx.room.compiler)
 

app/src/androidTest/java/usr/empty/player/ExampleInstrumentedTest.kt

@@ -1,24 +0,0 @@
-package usr.empty.player
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("usr.empty.player", appContext.packageName)
-    }
-}

app/src/main/AndroidManifest.xml

@@ -16,6 +16,7 @@
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
+        android:name=".EmptyApplication"
         android:theme="@style/Theme.Player">
         <activity
             android:name=".MainActivity"
@@ -23,7 +24,6 @@
             android:theme="@style/Theme.Player">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>

app/src/main/java/usr/empty/player/EmptyApplication.kt

@@ -0,0 +1,53 @@
+package usr.empty.player
+
+import android.app.Application
+import androidx.room.Room
+import usr.empty.player.database.AppDatabase
+import usr.empty.player.items.AlbumDescriptor
+import usr.empty.player.items.ArtistDescriptor
+import usr.empty.player.items.NotaDescriptor
+
+
+class EmptyApplication : Application() {
+    companion object {
+        private var _appInstance: EmptyApplication? = null
+
+        val appInstance: EmptyApplication
+            get() = _appInstance!!
+    }
+
+    lateinit var database: AppDatabase
+
+    val allTracks = ArrayList<NotaDescriptor>()
+
+    val allAlbums = ArrayList<AlbumDescriptor>()
+
+    val allArtists = HashMap<String, ArtistDescriptor>()
+
+    override fun onCreate() {
+        super.onCreate()
+        database = Room.databaseBuilder(
+            applicationContext, AppDatabase::class.java, "local"
+        ).allowMainThreadQueries().build()
+        database.artistDao().getAllArtists().forEach { allArtists[it.name ?: "unknown"] = ArtistDescriptor.fromArtist(it) }
+        database.albumDao().getAllAlbums().forEach { album ->
+            AlbumDescriptor.fromAlbum(album, database).let {
+                allAlbums.add(it)
+                allArtists[it.artistName]?.albumList?.add(it)
+            }
+        }
+        database.trackDao().getAll().forEach { track ->
+            NotaDescriptor.fromTrack(track, database).let {
+                allTracks.add(it)
+                allArtists[it.artist]?.trackList?.add(it)
+            }
+        }
+        _appInstance = this
+    }
+
+    fun addNewTrack(nota: NotaDescriptor) {
+        database.addNewTrack(nota)
+        allArtists[nota.artist]?.trackList?.add(nota)
+        allTracks.add(nota)
+    }
+}

app/src/main/java/usr/empty/player/MainActivity.kt

@@ -12,36 +12,52 @@ import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
 import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.Button
 import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Slider
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.mutableStateListOf
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.MutableState
+import androidx.compose.runtime.mutableFloatStateOf
+import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.toMutableStateList
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Brush
 import androidx.compose.ui.graphics.RectangleShape
 import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.media3.common.util.UnstableApi
-import androidx.room.Room
+import kotlinx.coroutines.delay
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
-import usr.empty.player.database.AppDatabase
+import usr.empty.player.items.NotaDescriptor
-import usr.empty.player.database.Track
 import usr.empty.player.ui.theme.PlayerTheme
+import kotlin.math.max
+import kotlin.math.min
 
 
 inline fun <T> nullifyException(block: () -> T) = try {
@@ -55,12 +71,6 @@ class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
-        //        Log.d("meow", "${filesDir.toPath().resolve("all_tracks.data")}")
-        val db = Room.databaseBuilder(
-            applicationContext, AppDatabase::class.java, "local"
-        ).allowMainThreadQueries().build()
-        Log.d("meow", "${db.trackDao().getAll()}")
-
         if (!Environment.isExternalStorageManager()) {
             val intent = Intent(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION)
             val uri = Uri.fromParts("package", packageName, null)
@@ -93,7 +103,12 @@ fun uriToPath(uri: Uri): String {
 @Composable
 fun MainLayout(modifier: Modifier = Modifier) {
     val context = LocalContext.current
-    val notas = remember { mutableStateListOf<NotaDescriptor>() }
+    val queueId = remember { mutableIntStateOf(-1) }
+    val notas = remember { EmptyApplication.appInstance.allTracks.toMutableStateList() }
+    val isPlaying =
+        remember { mutableStateOf(if (PlayerService.isServiceRunning) PlayerService.serviceInstance.player.isPlaying else false) }
+    val currentNota =
+        remember { mutableStateOf(if (PlayerService.isServiceRunning) PlayerService.serviceInstance.currentTrack?.descriptor else null) }
 
     val pickAudioLauncher = rememberLauncherForActivityResult(
         ActivityResultContracts.GetContent()
@@ -101,26 +116,21 @@ fun MainLayout(modifier: Modifier = Modifier) {
         audioUri?.run {
             uriToPath(this).let {
                 MediaMetadataRetriever().apply {
-                    setDataSource(it) //                    notas.add(NotaDescriptor(name = nullifyException {
+                    setDataSource(it)
-                    //                        extractMetadata(MediaMetadataRetriever.METADATA_KEY_TITLE)
+                    val nd = NotaDescriptor(name = nullifyException {
-                    //                    } ?: it.split('/').last().split('.').first(), artist = nullifyException {
-                    //                        extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST)
-                    //                    } ?: "Unknown Artist", sourceType = NotaDescriptor.Source.LOCAL, source = it))
-                    val db = Room.databaseBuilder(
-                        context.applicationContext, AppDatabase::class.java, "local"
-                    ).allowMainThreadQueries().build()
-                    db.trackDao().insertTrack(Track(title = nullifyException {
                         extractMetadata(MediaMetadataRetriever.METADATA_KEY_TITLE)
-                    } ?: it.split('/').last().split('.').first(),
+                    } ?: it.split('/').last().split('.').first(), artist = nullifyException {
-                                                    artistId = 0,
+                        extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST)
-                                                    albumId = null,
+                    } ?: "Unknown Artist", sourceType = NotaDescriptor.Source.LOCAL, source = it)
-                                                    sourceType = NotaDescriptor.Source.LOCAL,
+                    notas.add(nd)
-                                                    source = it))
+                    queueId.intValue--
+                    EmptyApplication.appInstance.addNewTrack(nd)
                 }
             }
         }
     }
 
+
     Column(modifier.fillMaxSize()) {
         Row(
             horizontalArrangement = Arrangement.Absolute.SpaceEvenly,
@@ -133,7 +143,6 @@ fun MainLayout(modifier: Modifier = Modifier) {
             }) {
                 Text("add track")
             }
-//            VerticalDivider()
             Button(shape = RectangleShape, colors = ButtonDefaults.buttonColors(
                 containerColor = MaterialTheme.colorScheme.secondaryContainer, contentColor = MaterialTheme.colorScheme.secondary
             ), modifier = Modifier, onClick = {
@@ -155,19 +164,32 @@ fun MainLayout(modifier: Modifier = Modifier) {
                 Text("| play >")
             }
         }
-        NotaList(notas)
+        NotaList(notas, modifier = Modifier.weight(1f), queueId = queueId.intValue, playState = isPlaying, currentNota)
+        if (isPlaying.value) Player(
+            modifier = Modifier
+                .padding(bottom = 20.dp)
+                .border(1.dp, color = MaterialTheme.colorScheme.primary, shape = RoundedCornerShape(25))
+        )
     }
 }
 
 @UnstableApi
 @Composable
-fun NotaList(notas: List<NotaDescriptor>, modifier: Modifier = Modifier, queueId: Int = notas.hashCode()) {
+fun NotaList(
+    notas: List<NotaDescriptor>,
+    modifier: Modifier = Modifier,
+    queueId: Int = notas.hashCode(),
+    playState: MutableState<Boolean>,
+    currentNota: MutableState<NotaDescriptor?>
+) {
     val context = LocalContext.current
     LazyColumn(
-        modifier = modifier,
+        modifier = modifier
     ) {
         itemsIndexed(notas) { index, nota ->
-            Column(modifier = Modifier
+            val localModifier =
+                if (currentNota.value == nota) Modifier.background(MaterialTheme.colorScheme.secondaryContainer) else Modifier
+            Column(modifier = localModifier
                 .fillParentMaxWidth()
                 .clickable {
                     Log.d("meow", "queueId: $queueId")
@@ -177,6 +199,7 @@ fun NotaList(notas: List<NotaDescriptor>, modifier: Modifier = Modifier, queueId
                         putExtra("queueId", queueId)
                         putExtra("queue", Json.encodeToString(notas))
                         putExtra("start", index)
+                        playState.value = true
                     })
                 }
                 .padding(4.dp)
@@ -192,14 +215,86 @@ fun NotaList(notas: List<NotaDescriptor>, modifier: Modifier = Modifier, queueId
     }
 }
 
+fun minMax(vMin: Float, x: Float, vMax: Float) = max(min(vMax, x), vMin)
+
 @UnstableApi
-@Preview
+@OptIn(ExperimentalMaterial3Api::class)
 @Composable
-fun Preview() {
+fun Player(modifier: Modifier = Modifier) {
-    NotaList(
+    val sliderPosition = remember { mutableFloatStateOf(0.0f) }
-        listOf(
+    val sliderMovingAllow = remember { mutableStateOf(true) }
-            NotaDescriptor(name = "hello", artist = "there", sourceType = NotaDescriptor.Source.LOCAL, source = ""),
+    val service = PlayerService.serviceInstance
-            NotaDescriptor(name = "preview", artist = "me", sourceType = NotaDescriptor.Source.LOCAL, source = ""),
+    LaunchedEffect(Unit) {
-        )
+        while (true) {
-    )
+            if (service.player.isPlaying and sliderMovingAllow.value) {
+                sliderPosition.floatValue = minMax(0.0f, service.player.currentPosition.toFloat() / service.player.duration.toFloat(), 1.0f)
+                delay(service.player.duration / 2000)
+                Log.d("meow", "${service.player.duration / 2000}")
+            } else delay(10)
+        }
+    }
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(1.dp)
+            .then(modifier)
+            .padding(horizontal = 16.dp, vertical = 8.dp)
+    ) { //        Image(
+        //            imageVector = Icons.Filled.PlayArrow,
+        //            contentDescription = "play",
+        //            colorFilter = ColorFilter.tint(MaterialTheme.colorScheme.primary),
+        //            modifier = Modifier
+        //                .size(50.dp)
+        //                .align(Alignment.CenterVertically)
+        //        )
+        Column(modifier = Modifier.align(Alignment.CenterVertically)) {
+            val nota = service.currentTrack?.descriptor ?: NotaDescriptor(
+                "unknown track", "unknown artist", NotaDescriptor.Source.LOCAL, ""
+            )
+            Text(nota.name, style = MaterialTheme.typography.titleLarge)
+            Text(nota.artist, style = MaterialTheme.typography.titleSmall)
+            Slider(value = sliderPosition.floatValue, thumb = {
+                Box(
+                    Modifier
+                        .clip(RoundedCornerShape(2.dp))
+                        .width(3.dp)
+                        .height(18.dp)
+                        .background(MaterialTheme.colorScheme.tertiary)
+                )
+            }, track = {
+                Row(Modifier.clip(RoundedCornerShape(1.dp))) {
+                    if (sliderPosition.floatValue != 0.0f) Box(
+                        Modifier
+                            .weight(sliderPosition.floatValue)
+                            .height(2.dp)
+                            .background(
+                                Brush.linearGradient(
+                                    listOf(
+                                        MaterialTheme.colorScheme.secondary, MaterialTheme.colorScheme.tertiary
+                                    )
+                                )
+                            )
+                    )
+                    if (sliderPosition.floatValue != 1.0f) Box(
+                        Modifier
+                            .weight(1 - sliderPosition.floatValue)
+                            .height(2.dp)
+                            .background(
+                                Brush.linearGradient(
+                                    listOf(
+                                        MaterialTheme.colorScheme.tertiaryContainer, MaterialTheme.colorScheme.secondaryContainer
+                                    )
+                                )
+                            )
+                    )
+                }
+            }, onValueChange = {
+                sliderPosition.floatValue = it
+                sliderMovingAllow.value = false
+            }, onValueChangeFinished = {
+                service.player.seekTo((service.player.duration.toFloat() * sliderPosition.floatValue).toLong())
+                sliderMovingAllow.value = true
+            })
+        }
+    }
 }

app/src/main/java/usr/empty/player/Nota.kt

@@ -2,6 +2,7 @@ package usr.empty.player
 
 import androidx.media3.common.MediaItem
 import androidx.media3.exoplayer.ExoPlayer
+import usr.empty.player.items.NotaDescriptor
 
 
 class Nota(val descriptor: NotaDescriptor) {

app/src/main/java/usr/empty/player/NotaDescriptor.kt

@@ -1,16 +0,0 @@
-package usr.empty.player
-
-import kotlinx.serialization.Serializable
-
-
-@Serializable
-data class NotaDescriptor(
-    val name: String,
-    val artist: String,
-    val sourceType: Source,
-    val source: String,
-) {
-    enum class Source {
-        LOCAL
-    }
-}

app/src/main/java/usr/empty/player/PlayerService.kt

@@ -18,21 +18,44 @@ import androidx.media3.session.MediaStyleNotificationHelper
 import androidx.media3.ui.PlayerNotificationManager
 import com.google.common.util.concurrent.Futures
 import com.google.common.util.concurrent.ListenableFuture
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
 import kotlinx.serialization.json.Json
+import usr.empty.player.items.NotaDescriptor
 
 
 @UnstableApi
 class PlayerService : MediaSessionService() {
+    companion object {
+        private var _serviceInstance: PlayerService? = null
+
+        val serviceInstance: PlayerService
+            get() = _serviceInstance!!
+
+        var isServiceRunning = false
+    }
+
     private lateinit var mediaSession: MediaSession
     lateinit var player: ExoPlayer
     private lateinit var playerNotificationManager: PlayerNotificationManager
     private val notificationId = 1004
     private var virtualQueue = NotaQueue()
-    private var queueId = -1
+    val currentTrack
+        get() = virtualQueue.current
+    private var queueId = 0
+    var control = Channel<Boolean>()
+    var data = Channel<Pair<Boolean, Float>>()
 
+    @OptIn(ExperimentalCoroutinesApi::class)
     @SuppressLint("ForegroundServiceType")
     override fun onCreate() {
         super.onCreate()
+        _serviceInstance = this
+        isServiceRunning = true
         player = ExoPlayer.Builder(this).build()
         player.addListener(object : Player.Listener {
             override fun onIsPlayingChanged(isPlaying: Boolean) {
@@ -49,13 +72,13 @@ class PlayerService : MediaSessionService() {
 
                 override fun createCurrentContentIntent(player: Player) = null
 
-                override fun getCurrentContentText(player: Player) = "context?"
+                override fun getCurrentContentText(player: Player) = "content?"
 
                 override fun getCurrentLargeIcon(player: Player, callback: PlayerNotificationManager.BitmapCallback) = null
             })
             .build()
             .apply {
-                setPriority(NotificationCompat.PRIORITY_DEFAULT)
+                setPriority(NotificationCompat.PRIORITY_MAX)
                 setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
                 setPlayer(player)
                 setMediaSessionToken(mediaSession.platformToken)
@@ -66,6 +89,16 @@ class PlayerService : MediaSessionService() {
 
         val nBuilder = NotificationCompat.Builder(this, "emptyynes").setStyle(MediaStyleNotificationHelper.MediaStyle(mediaSession))
         startForeground(notificationId, nBuilder.build(), FOREGROUND_SERVICE_TYPE_MEDIA_PLAYBACK)
+
+        CoroutineScope(SupervisorJob()).launch { //            data.
+            while (true) {
+                while (control.isEmpty) {
+                    data.send(player.isPlaying to (player.currentPosition.toFloat() / player.duration.toFloat()))
+                    delay(if (player.isPlaying) player.duration / 2000 else 33)
+                }
+                if (!control.receive()) break
+            }
+        }
     }
 
     override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {

app/src/main/java/usr/empty/player/database/Album.kt

@@ -0,0 +1,30 @@
+package usr.empty.player.database
+
+import androidx.room.ColumnInfo
+import androidx.room.Dao
+import androidx.room.Entity
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy.Companion.IGNORE
+import androidx.room.PrimaryKey
+import androidx.room.Query
+import java.util.UUID
+
+@Entity
+data class Album(
+    @ColumnInfo val name: String, @ColumnInfo val artistId: UUID
+) {
+    @PrimaryKey
+    var uuid: UUID = UUID.nameUUIDFromBytes("$name$artistId".toByteArray())
+}
+
+@Dao
+interface AlbumDao {
+    @Insert(onConflict = IGNORE)
+    fun insertAlbum(album: Album)
+
+    @Query("SELECT * FROM album")
+    fun getAllAlbums(): List<Album>
+
+    @Query("SELECT * FROM album WHERE :uuid = uuid")
+    fun getAlbumByUUID(uuid: UUID): Album?
+}

app/src/main/java/usr/empty/player/database/AppDatabase.kt

@@ -2,10 +2,20 @@ package usr.empty.player.database
 
 import androidx.room.Database
 import androidx.room.RoomDatabase
+import usr.empty.player.items.NotaDescriptor
 
 @Database(
-    entities = [Track::class], version = 1
+    entities = [Track::class, Artist::class, Album::class], version = 1
 )
 abstract class AppDatabase : RoomDatabase() {
     abstract fun trackDao(): TrackDao
+    abstract fun artistDao(): ArtistDao
+    abstract fun albumDao(): AlbumDao
+
+    fun addNewTrack(nota: NotaDescriptor) {
+        Artist(Artist.ArtistType.UNKNOWN, nota.artist).let { artist ->
+            artistDao().insertArtist(artist)
+            trackDao().insertTrack(Track(nota.name, artist.uuid, null, nota.sourceType, nota.source))
+        }
+    }
 }

app/src/main/java/usr/empty/player/database/Artist.kt

@@ -0,0 +1,35 @@
+package usr.empty.player.database
+
+import androidx.room.ColumnInfo
+import androidx.room.Dao
+import androidx.room.Entity
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy.Companion.IGNORE
+import androidx.room.PrimaryKey
+import androidx.room.Query
+import java.util.UUID
+
+
+@Entity
+data class Artist(
+    @ColumnInfo val type: ArtistType, @ColumnInfo val name: String?
+) {
+    enum class ArtistType {
+        UNKNOWN, SINGLE, DUET, FEAT, BAND, CIRCLE
+    }
+
+    @PrimaryKey
+    var uuid: UUID = if (name == null) UUID.randomUUID() else UUID.nameUUIDFromBytes(name.toByteArray())
+}
+
+@Dao
+interface ArtistDao {
+    @Insert(onConflict = IGNORE)
+    fun insertArtist(artist: Artist)
+
+    @Query("SELECT * FROM artist")
+    fun getAllArtists(): List<Artist>
+
+    @Query("SELECT * FROM artist WHERE :uuid = uuid")
+    fun getArtistByUUID(uuid: UUID): Artist?
+}

app/src/main/java/usr/empty/player/database/Track.kt

@@ -4,38 +4,39 @@ import androidx.room.ColumnInfo
 import androidx.room.Dao
 import androidx.room.Entity
 import androidx.room.Insert
+import androidx.room.OnConflictStrategy.Companion.REPLACE
 import androidx.room.PrimaryKey
 import androidx.room.Query
-import usr.empty.player.NotaDescriptor
+import usr.empty.player.items.NotaDescriptor
 import java.util.UUID
 
 // a.k.a. Nota
 @Entity
 data class Track(
     @ColumnInfo val title: String,
-    @ColumnInfo val artistId: Int,
+    @ColumnInfo val artistId: UUID,
-    @ColumnInfo val albumId: Int?,
+    @ColumnInfo val albumId: UUID?,
     @ColumnInfo val sourceType: NotaDescriptor.Source,
     @ColumnInfo val source: String,
 ) {
-    @PrimaryKey(autoGenerate = true)
+    @PrimaryKey
-    var uid: Int = 0
-
-    @ColumnInfo
     var uuid: UUID = UUID.nameUUIDFromBytes("${title}${artistId}".toByteArray())
 }
 
 @Dao
 interface TrackDao {
-    @Insert
+    @Insert(onConflict = REPLACE)
     fun insertTrack(track: Track)
 
     @Query("SELECT * FROM track")
     fun getAll(): List<Track>
 
     @Query("SELECT * FROM track WHERE :artistId = artistId")
-    fun getByArtistId(artistId: Int): List<Track>
+    fun getByArtistId(artistId: UUID): List<Track>
 
     @Query("SELECT * FROM track WHERE :albumId = albumId")
-    fun getByAlbumId(albumId: Int): List<Track>
+    fun getByAlbumId(albumId: UUID): List<Track>
+
+    @Query("DELETE FROM track WHERE uuid = :uuid")
+    fun deleteByUUID(uuid: UUID)
 }

app/src/main/java/usr/empty/player/items/AlbumDescriptor.kt

@@ -0,0 +1,19 @@
+package usr.empty.player.items
+
+import usr.empty.player.database.Album
+import usr.empty.player.database.AppDatabase
+
+class AlbumDescriptor(
+    val name: String, val artistName: String?, @Suppress("unused") val trackList: List<NotaDescriptor>
+) {
+    companion object {
+        fun fromAlbum(album: Album, database: AppDatabase): AlbumDescriptor {
+            return AlbumDescriptor(
+                album.name,
+                database.artistDao().getArtistByUUID(album.artistId)?.name,
+                database.trackDao().getByAlbumId(album.uuid).map {
+                    NotaDescriptor.fromTrack(it, database)
+                })
+        }
+    }
+}

app/src/main/java/usr/empty/player/items/ArtistDescriptor.kt

@@ -0,0 +1,17 @@
+package usr.empty.player.items
+
+import usr.empty.player.database.Artist
+
+
+class ArtistDescriptor(
+    val name: String
+) {
+    val albumList = ArrayList<AlbumDescriptor>()
+    val trackList = ArrayList<NotaDescriptor>()
+
+    companion object {
+        fun fromArtist(artist: Artist): ArtistDescriptor {
+            return ArtistDescriptor(artist.name ?: "unknown")
+        }
+    }
+}

app/src/main/java/usr/empty/player/items/NotaDescriptor.kt

@@ -0,0 +1,45 @@
+package usr.empty.player.items
+
+import kotlinx.serialization.Serializable
+import usr.empty.player.database.AppDatabase
+import usr.empty.player.database.Track
+
+
+@Serializable
+data class NotaDescriptor(
+    val name: String,
+    val artist: String,
+    val sourceType: Source,
+    val source: String,
+) {
+    companion object {
+        fun fromTrack(track: Track, database: AppDatabase): NotaDescriptor {
+            return NotaDescriptor(
+                track.title, database.artistDao().getArtistByUUID(track.artistId)?.name ?: "unknown", track.sourceType, track.source
+            )
+        }
+    }
+
+    enum class Source {
+        LOCAL
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (other == null) return false
+        if (other !is NotaDescriptor) return false
+        if (this.hashCode() != other.hashCode()) return false
+        if (this.sourceType != other.sourceType) return false
+        if (this.source != other.source) return false
+        if (this.artist != other.artist) return false
+        if (this.name != other.name) return false
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = name.hashCode()
+        result = 31 * result + artist.hashCode()
+        result = 31 * result + sourceType.hashCode()
+        result = 31 * result + source.hashCode()
+        return result
+    }
+}

gradle/libs.versions.toml

@@ -2,12 +2,14 @@
 agp = "8.6.1"
 kotlin = "2.0.0"
 coreKtx = "1.13.1"
+kotlinxCoroutinesAndroid = "1.7.3"
 kotlinxSerializationJson = "1.7.3"
 lifecycleRuntimeKtx = "2.8.6"
 activityCompose = "1.9.2"
 composeBom = "2024.09.03"
 media3Exoplayer = "1.4.1"
 roomRuntime = "2.6.1"
+composeAudiowaveformVersion = "1.1.2"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
@@ -19,6 +21,7 @@ androidx-lifecycle-runtime-ktx = { group = "androidx.lifecycle", name = "lifecyc
 androidx-activity-compose = { group = "androidx.activity", name = "activity-compose", version.ref = "activityCompose" }
 androidx-compose-bom = { group = "androidx.compose", name = "compose-bom", version.ref = "composeBom" }
 androidx-room-compiler = { module = "androidx.room:room-compiler", version.ref = "roomRuntime" }
+androidx-room-ktx = { module = "androidx.room:room-ktx", version.ref = "roomRuntime" }
 androidx-room-runtime = { module = "androidx.room:room-runtime", version.ref = "roomRuntime" }
 androidx-ui = { group = "androidx.compose.ui", name = "ui" }
 androidx-ui-graphics = { group = "androidx.compose.ui", name = "ui-graphics" }
@@ -26,6 +29,7 @@ androidx-ui-tooling = { group = "androidx.compose.ui", name = "ui-tooling" }
 androidx-ui-tooling-preview = { group = "androidx.compose.ui", name = "ui-tooling-preview" }
 androidx-ui-test-manifest = { group = "androidx.compose.ui", name = "ui-test-manifest", version = "1.7.3" }
 androidx-material3 = { group = "androidx.compose.material3", name = "material3" }
+kotlinx-coroutines-android = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-android", version.ref = "kotlinxCoroutinesAndroid" }
 kotlinx-serialization-json = { module = "org.jetbrains.kotlinx:kotlinx-serialization-json", version.ref = "kotlinxSerializationJson" }
 com-google-devtools-ksp-gradle-plugin = { group = "com.google.devtools.ksp", name = "com.google.devtools.ksp.gradle.plugin", version = "2.0.20-1.0.25" }