Made repository methods asynchronous. Simplified playlist repository. Use playlist manager in the app, and left playlist repository to only be used by the playlist manager.

Harmonia.Core/Playlists/PlaylistManager.cs

@@ -1,7 +1,12 @@
 namespace Harmonia.Core.Playlists;
 
-public class PlaylistManager(IPlaylistRepository playlistRepository) : IPlaylistManager
+public class PlaylistManager : IPlaylistManager
 {
+    private readonly IPlaylistRepository playlistRepository;
+    private readonly List<Playlist> _playlists = [];
+
+    public IReadOnlyList<Playlist> Playlists => _playlists;
+
     private Playlist? _currentPlaylist;
     public Playlist? CurrentPlaylist
     {
@@ -20,22 +25,60 @@ public class PlaylistManager(IPlaylistRepository playlistRepository) : IPlaylist
     public event EventHandler<PlaylistAddedEventArgs>? PlaylistAdded;
     public event EventHandler<PlaylistRemovedEventArgs>? PlaylistRemoved;
 
-    public void AddPlaylist()
+    public PlaylistManager(IPlaylistRepository playlistRepository)
+    {
+        this.playlistRepository = playlistRepository;
+    }
+
+    public async Task InitializeAsync()
+    {
+        _playlists.AddRange(playlistRepository.Get());
+
+        foreach (Playlist playlist in _playlists)
+        {
+            playlist.PlaylistUpdated += OnPlaylistUpdated;
+        }
+
+        CurrentPlaylist = _playlists.Count > 0 ? _playlists[0] : await AddPlaylistAsync();
+    }
+
+    public async Task<Playlist> AddPlaylistAsync()
     {
         Playlist playlist = new()
         {
             Name = "New Playlist"
         };
 
-        playlistRepository.Save(playlist);
+        playlist.PlaylistUpdated += OnPlaylistUpdated;
+        _playlists.Add(playlist);
+
+        await playlistRepository.SaveAsync(playlist);
 
         PlaylistAdded?.Invoke(this, new(playlist));
+
+        return playlist;
     }
 
     public void RemovePlaylist(Playlist playlist)
     {
+        playlist.PlaylistUpdated -= OnPlaylistUpdated;
+        _playlists.Remove(playlist);
+
         playlistRepository.Delete(playlist);
 
         PlaylistRemoved?.Invoke(this, new(playlist));
     }
+
+    public Playlist? GetPlaylist(PlaylistSong playlistSong)
+    {
+        return _playlists.FirstOrDefault(playlist => playlist.Songs.Any(song => song.UID == playlistSong.UID));
+    }
+
+    private async void OnPlaylistUpdated(object? sender, PlaylistUpdatedEventArgs e)
+    {
+        if (sender is not Playlist playlist)
+            return;
+
+        await playlistRepository.SaveAsync(playlist);
+    }
 }