Exit Playlist page when playlist is deleted

app/src/main/java/code/name/monkey/retromusic/db/PlaylistDao.kt

@@ -64,4 +64,7 @@ interface PlaylistDao {
 
     @Query("SELECT * FROM SongEntity WHERE playlist_creator_id= :playlistId")
     fun favoritesSongs(playlistId: Long): List<SongEntity>
+
+    @Query("SELECT EXISTS(SELECT * FROM PlaylistEntity WHERE playlist_id = :playlistId)")
+    fun checkPlaylistExists(playlistId: Long): LiveData<Boolean>
 }

app/src/main/java/code/name/monkey/retromusic/fragments/playlists/PlaylistDetailsFragment.kt

@@ -9,6 +9,7 @@ import androidx.activity.addCallback
 import androidx.core.view.ViewCompat
 import androidx.core.view.doOnPreDraw
 import androidx.core.view.isVisible
+import androidx.navigation.fragment.findNavController
 import androidx.navigation.fragment.navArgs
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
@@ -58,7 +59,6 @@ class PlaylistDetailsFragment : AbsMainActivityFragment(R.layout.fragment_playli
         enterTransition = MaterialSharedAxis(MaterialSharedAxis.Z, true).addTarget(view)
         returnTransition = MaterialSharedAxis(MaterialSharedAxis.Z, false)
         setHasOptionsMenu(true)
-        mainActivity.addMusicServiceEventListener(viewModel)
         mainActivity.setSupportActionBar(binding.toolbar)
         ViewCompat.setTransitionName(binding.container, "playlist")
         playlist = arguments.extraPlaylist
@@ -67,6 +67,11 @@ class PlaylistDetailsFragment : AbsMainActivityFragment(R.layout.fragment_playli
         viewModel.getSongs().observe(viewLifecycleOwner) {
             songs(it.toSongs())
         }
+        viewModel.playlistExists().observe(viewLifecycleOwner) {
+            if (!it) {
+                findNavController().navigateUp()
+            }
+        }
         postponeEnterTransition()
         requireView().doOnPreDraw { startPostponedEnterTransition() }
         requireActivity().onBackPressedDispatcher.addCallback(viewLifecycleOwner) {

app/src/main/java/code/name/monkey/retromusic/fragments/playlists/PlaylistDetailsViewModel.kt

@@ -22,24 +22,15 @@ import code.name.monkey.retromusic.db.SongEntity
 import code.name.monkey.retromusic.interfaces.IMusicServiceEventListener
 import code.name.monkey.retromusic.model.Song
 import code.name.monkey.retromusic.repository.RealRepository
+import code.name.monkey.retromusic.repository.RealRoomRepository
 
 class PlaylistDetailsViewModel(
     private val realRepository: RealRepository,
     private var playlist: PlaylistWithSongs
-) : ViewModel(), IMusicServiceEventListener {
-
-    private val playListSongs = MutableLiveData<List<Song>>()
-
+) : ViewModel() {
     fun getSongs(): LiveData<List<SongEntity>> =
         realRepository.playlistSongs(playlist.playlistEntity.playListId)
 
-    override fun onMediaStoreChanged() {}
-    override fun onServiceConnected() {}
-    override fun onServiceDisconnected() {}
-    override fun onQueueChanged() {}
-    override fun onPlayingMetaChanged() {}
-    override fun onPlayStateChanged() {}
-    override fun onRepeatModeChanged() {}
-    override fun onShuffleModeChanged() {}
-    override fun onFavoriteStateChanged() {}
+    fun playlistExists(): LiveData<Boolean> =
+        realRepository.checkPlaylistExists(playlist.playlistEntity.playListId)
 }

app/src/main/java/code/name/monkey/retromusic/repository/Repository.kt

@@ -111,6 +111,7 @@ interface Repository {
     suspend fun searchAlbums(query: String): List<Album>
     suspend fun isSongFavorite(songId: Long): Boolean
     fun getSongByGenre(genreId: Long): Song
+    fun checkPlaylistExists(playListId: Long): LiveData<Boolean>
 }
 
 class RealRepository(
@@ -277,6 +278,9 @@ class RealRepository(
     override suspend fun checkPlaylistExists(playlistName: String): List<PlaylistEntity> =
         roomRepository.checkPlaylistExists(playlistName)
 
+    override fun checkPlaylistExists(playListId: Long): LiveData<Boolean> =
+        roomRepository.checkPlaylistExists(playListId)
+
     override suspend fun createPlaylist(playlistEntity: PlaylistEntity): Long =
         roomRepository.createPlaylist(playlistEntity)
 
@@ -377,7 +381,7 @@ class RealRepository(
     }
 
     override suspend fun suggestions(): List<Song> {
-        if (!PreferenceUtil.homeSuggestions) return listOf<Song>()
+        if (!PreferenceUtil.homeSuggestions) return listOf()
         return NotPlayedPlaylist().songs().shuffled().takeIf {
             it.size > 9
         } ?: emptyList()

app/src/main/java/code/name/monkey/retromusic/repository/RoomRepository.kt

@@ -49,6 +49,7 @@ interface RoomRepository {
     suspend fun blackListPaths(): List<BlackListStoreEntity>
     suspend fun deleteSongs(songs: List<Song>)
     suspend fun isSongFavorite(context: Context, songId: Long): Boolean
+    fun checkPlaylistExists(playListId: Long): LiveData<Boolean>
 }
 
 class RealRoomRepository(
@@ -97,6 +98,9 @@ class RealRoomRepository(
     override fun getSongs(playListId: Long): LiveData<List<SongEntity>> =
         playlistDao.songsFromPlaylist(playListId)
 
+    override fun checkPlaylistExists(playListId: Long): LiveData<Boolean> =
+        playlistDao.checkPlaylistExists(playListId)
+
     override suspend fun deletePlaylistEntities(playlistEntities: List<PlaylistEntity>) =
         playlistDao.deletePlaylists(playlistEntities)