Added logic for tags and audio engine.

Harmonia.Core/Playlists/PlaylistManager.cs

@@ -0,0 +1,43 @@
+using Harmonia.Core.Data;
+
+namespace Harmonia.Core.Playlists;
+
+public class PlaylistManager(IRepository<Playlist> playlistRepository) : IPlaylistManager
+{
+    private Playlist? _currentPlaylist;
+    public Playlist? CurrentPlaylist
+    {
+        get
+        {
+            return _currentPlaylist;
+        }
+        set
+        {
+            _currentPlaylist = value;
+            CurrentPlaylistChanged?.Invoke(this, new());
+        }
+    }
+
+    public event EventHandler? CurrentPlaylistChanged;
+    public event EventHandler<PlaylistAddedEventArgs>? PlaylistAdded;
+    public event EventHandler<PlaylistRemovedEventArgs>? PlaylistRemoved;
+
+    public void AddPlaylist()
+    {
+        Playlist playlist = new()
+        {
+            Name = "New Playlist"
+        };
+
+        playlistRepository.Save(playlist);
+
+        PlaylistAdded?.Invoke(this, new(playlist));
+    }
+
+    public void RemovePlaylist(Playlist playlist)
+    {
+        playlistRepository.Delete(playlist);
+
+        PlaylistRemoved?.Invoke(this, new(playlist));
+    }
+}