1 files changed, 54 insertions, 0 deletions
diff --git a/source/game/music/MusicManager.cs b/source/game/music/MusicManager.cs
new file mode 100644
index 0000000..8d9f9f5
--- /dev/null
+++ b/source/game/music/MusicManager.cs
@@ -0,0 +1,54 @@
+using System;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Media;
+
+namespace Celesteia.Game.Music {
+    public class MusicManager : GameComponent {
+        private new GameInstance Game => (GameInstance) base.Game;
+        public MusicManager(GameInstance Game) : base(Game) {}
+
+        private float SetVolume = 0.1f;
+        private float _volume;
+        private Song _nextUp;
+        private float _elapsedTransitionTime;
+        private float _transitionDuration = 2f;
+        private bool _transitionComplete = false;
+
+        public override void Update(GameTime gameTime)
+        {
+            if (_elapsedTransitionTime >= _transitionDuration) _volume = 1f;
+            else {
+                _elapsedTransitionTime += ((float)gameTime.ElapsedGameTime.TotalMilliseconds / 1000f);
+
+                if (_elapsedTransitionTime >= _transitionDuration / 2f && !_transitionComplete) {
+                    if (_nextUp != null) {
+                        MediaPlayer.Play(_nextUp);
+                        _nextUp = null;
+                    } else Stop();
+                    
+                    _transitionComplete = true;
+                }
+
+                _volume = Volume(_elapsedTransitionTime);
+            }
+
+            MediaPlayer.Volume = _volume * SetVolume;
+        }
+
+        public void PlayNow(Song song, bool repeat = true) {
+            MediaPlayer.IsRepeating = repeat;
+
+            _elapsedTransitionTime = MediaPlayer.State == MediaState.Playing ? 0f : 1f;
+            _transitionComplete = false;
+            _nextUp = song;
+        }
+
+        public void Stop() {
+            MediaPlayer.Stop();
+        }
+
+        private float Volume(float x) {
+            return Math.Abs(x - (_transitionDuration / 2f));
+        }
+    }
+}
+\ No newline at end of file