src/engine/systems/Music.ts


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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();
    }
  }
}