refactor: update media retrieval to use Flow and improve error handling in PlaylistQueue loading

core/src/main/java/hu/bbara/purefin/data/CompositeMediaRepository.kt

@@ -46,19 +46,16 @@ class CompositeMediaRepository @Inject constructor(
     override suspend fun getMovie(id: UUID): Flow<Movie?> {
         return activeRepository
             .flatMapLatest { it.getMovie(id) }
-            .stateIn(scope, SharingStarted.Companion.Eagerly, null)
     }
 
     override suspend fun getSeries(id: UUID): Flow<Series?> {
         return activeRepository
             .flatMapLatest { it.getSeries(id) }
-            .stateIn(scope, SharingStarted.Companion.Eagerly, null)
     }
 
     override suspend fun getEpisode(id: UUID): Flow<Episode?> {
         return activeRepository
             .flatMapLatest { it.getEpisode(id) }
-            .stateIn(scope, SharingStarted.Companion.Eagerly, null)
     }
 
     override fun observeSeriesWithContent(seriesId: UUID): Flow<Series?> {

core/src/main/java/hu/bbara/purefin/player/manager/PlayerManager.kt

@@ -27,12 +27,12 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.cancel
 import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.combine
-import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.flow.firstOrNull
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
@@ -61,28 +61,27 @@ class PlayerManager @Inject constructor(
     private val mediaSegmentManager = MediaSegmentManager(player as ExoPlayer)
 
     private val _currentMediaId = MutableStateFlow<UUID?>(null)
-    val currentPlayableMedia: StateFlow<PlayableMedia?> by lazy {
+    private val _playlist = MutableStateFlow(emptyList<PlayableMedia>())
+    val playlist: StateFlow<List<PlayableMedia>> = _playlist.asStateFlow()
+
+    val currentPlayableMedia: Flow<PlayableMedia?> =
         combine(_currentMediaId, _playlist) { mediaId, playlist ->
             playlist.firstOrNull { it.id == mediaId }
-        }.stateIn(scope, SharingStarted.Eagerly, null)
         }
 
     private var pendingSeekPositionMs: Long? = null
-
     private val _playbackState = MutableStateFlow(PlaybackStateSnapshot())
+
     val playbackState: StateFlow<PlaybackStateSnapshot> = _playbackState.asStateFlow()
-
     private val _progress = MutableStateFlow(PlaybackProgressSnapshot())
+
     val progress: StateFlow<PlaybackProgressSnapshot> = _progress.asStateFlow()
-
     private val _metadata = MutableStateFlow(MetadataState())
+
     val metadata: StateFlow<MetadataState> = _metadata.asStateFlow()
-
     private val _tracks = MutableStateFlow(TrackSelectionState())
-    val tracks: StateFlow<TrackSelectionState> = _tracks.asStateFlow()
 
-    private val _playlist = MutableStateFlow(emptyList<PlayableMedia>())
-    val playlist: StateFlow<List<PlayableMedia>> = _playlist.asStateFlow()
+    val tracks: StateFlow<TrackSelectionState> = _tracks.asStateFlow()
 
     private val listener = object : Player.Listener {
         override fun onPositionDiscontinuity(
@@ -102,13 +101,17 @@ class PlayerManager @Inject constructor(
         override fun onMediaItemTransition(mediaItem: MediaItem?, reason: Int) {
             _currentMediaId.value = mediaItem?.mediaId?.let { UUID.fromString(it) }
             scope.launch {
-                currentPlayableMedia.value?.let { currentMedia ->
+                val currentMedia = _playlist.value.firstOrNull { it.id == _currentMediaId.value }
+                if (currentMedia == null) {
+                    _playbackState.update { it.copy(error = "Media not found in playlist") }
+                    return@launch
+                }
                 // Only updatePlaylist when episodes are being played. First item is handled when playMedia is being called first time.
                 if (currentMedia is PlayableMedia.Episode) {
                     updatePlaylist()
                 }
                 seekTo(currentMedia.resumePositionMs)
-                }
+                resumePlayback()
             }
         }
 
@@ -142,21 +145,20 @@ class PlayerManager @Inject constructor(
         val index = _playlist.value.indexOfFirst { it.id == mediaId }
         if (index != -1) {
             player.seekToDefaultPosition(index)
-            player.playWhenReady = true
         } else {
             _playbackState.update { it.copy(error = "Media not found in playlist") }
         }
     }
 
     private suspend fun playNewMedia(mediaId: UUID) {
-        val playableMedia = playableMediaRepository.getPlayableMedia(mediaId)
+        var playableMedia = playableMediaRepository.getPlayableMedia(mediaId)
         if (playableMedia == null) {
             _playbackState.update { it.copy(error = "Media not found") }
             return
         }
+        _playlist.update { it + playableMedia }
         player.setMediaItem(playableMedia.mediaItem)
         player.prepare()
-        player.playWhenReady = true
     }
 
     private suspend fun updatePlaylist() {
@@ -289,8 +291,8 @@ class PlayerManager @Inject constructor(
         _playbackState.update { it.copy(error = null) }
     }
 
-    private fun applyTrackPreferences() {
-        val preferences = currentPlayableMedia.value?.preferences ?: return
+    private suspend fun applyTrackPreferences() {
+        val preferences = currentPlayableMedia.firstOrNull()?.preferences ?: return
 
         val currentTrackState = _tracks.value
 

core/src/main/java/hu/bbara/purefin/player/viewmodel/PlayerViewModel.kt

@@ -126,7 +126,7 @@ class PlayerViewModel @Inject constructor(
                 _uiState.update { state ->
                     state.copy(
                         queue = playlist.mapNotNull { playableMedia ->
-                            playableMedia.toPlaylistElementUiModel(currentPlayableMedia.value?.id)
+                            playableMedia.toPlaylistElementUiModel(currentPlayableMedia.first()?.id)
                         }
                     )
                 }

data/src/main/java/hu/bbara/purefin/data/catalog/InMemoryMediaRepository.kt

@@ -86,10 +86,9 @@ class InMemoryMediaRepository @Inject constructor(
                 episodesState.update { current -> current + (episode.id to episode) }
             }
         }
-        val episodeFlow = episodesState.map { it[id] }
-        val seriesId = episodeFlow.first()!!.seriesId
-        observeSeriesWithContent(seriesId = seriesId)
-        return episodeFlow
+        val episode = episodesState.value[id] ?: return flowOf(null)
+        observeSeriesWithContent(seriesId = episode.seriesId)
+        return episodesState.map { it[id] }
     }
 
     fun upsertMovies(movies: List<Movie>) {