level one (applications prototype finished!)

1 files changed, 40 insertions, 0 deletions

diff --git a/src/engine/systems/Music.ts b/src/engine/systems/Music.ts
new file mode 100644
index 0000000..6e2004d
--- /dev/null
+++ b/src/engine/systems/Music.ts
@@ -0,0 +1,40 @@
+import { System, SystemNames } from ".";
+import { Music as GameMusic, SOUNDS } from "../config";
+
+export class Music extends System {
+  private songs: string[] = [];
+  private currentSong?: string;
+
+  constructor() {
+    super(SystemNames.Music);
+
+    this.songs = Array.from(GameMusic.states!.values()).map(
+      (state) => state.name,
+    );
+  }
+
+  private chooseRandomSong() {
+    return this.songs[Math.floor(Math.random() * this.songs.length)];
+  }
+
+  public playNext() {
+    let nextSong = this.chooseRandomSong();
+    while (nextSong === this.currentSong) {
+      nextSong = this.chooseRandomSong();
+    }
+
+    this.currentSong = nextSong;
+    SOUNDS.get(this.currentSong)?.play();
+
+    // when done, play next song
+    SOUNDS.get(this.currentSong)?.addEventListener("ended", () => {
+      this.playNext();
+    });
+  }
+
+  public update(_dt: number) {
+    if (!this.currentSong) {
+      this.playNext();
+    }
+  }
+}