// Hintergrundmusik-Player: spielt die Lieder aus assets/music/
// (HTML5-Audio). Die Original-Dateinamen sind kryptisch – hier bekommen
// sie stimmige Titel fürs Tal.

const DIR = 'assets/music/';

export const TRACKS = [
  { file: 'Geluk op de Piste.mp3', title: 'Glück auf der Piste' },
  { file: 'Sur les skis en Autriche.mp3', title: 'Auf Skiern durch Österreich' },
  { file: 'ski rock 1.mp3', title: 'Pistenrock' },
  { file: 'När jag var liten i Österrike SW.mp3', title: 'Heimweh nach dem Tal' },
  { file: 'När jag var liten i Österrike SW (1).mp3', title: 'Kindheit in den Bergen' },
  { file: 'När jag var liten i Österrike SW (2).mp3', title: 'Almsommer' },
  { file: 'sweet cold tunes.mp3', title: 'Schneegestöber' },
  { file: 'sweet cold tunes (1).mp3', title: 'Erster Schnee' },
  { file: 'sweet cold tunes 2.mp3', title: 'Gipfelmelodie' },
  { file: 'sweet cold tunes 3.mp3', title: 'Winterruhe' },
  { file: 'sweet cold tunes 3 (1).mp3', title: 'Spuren im Pulverschnee' },
  { file: 'sweet cold tunes 3 (2).mp3', title: 'Hüttenabend' },
  { file: 'sweet cold tunes 3 (3).mp3', title: 'Talstation um sieben' },
  { file: 'sweet cold tunes 3 (4).mp3', title: 'Nordwandlicht' },
  { file: 'sweet cold tunes 3 (5).mp3', title: 'Seilbahnschweben' },
  { file: 'sweet cold tunes 3 (6).mp3', title: 'Föhn überm Grat' },
];

export const player = {
  el: null,             // HTMLAudioElement
  idx: 0,
  playing: false,
  onChange: null,       // UI-Callback bei jedem Zustandswechsel

  init() {
    this.el = new Audio();
    this.el.volume = Number(localStorage.getItem('tt_volume') ?? 0.35);
    this.idx = Number(localStorage.getItem('tt_track') ?? 0) % TRACKS.length;
    this.el.addEventListener('ended', () => this.next());
    this._load();
  },

  _load() {
    this.el.src = DIR + encodeURIComponent(TRACKS[this.idx].file);
    localStorage.setItem('tt_track', this.idx);
  },

  _notify() { this.onChange?.(); },

  current() { return TRACKS[this.idx]; },

  play() {
    this.el.play().then(() => {
      this.playing = true;
      this._notify();
    }).catch(() => { /* Autoplay blockiert – Nutzer startet manuell */ });
  },

  pause() {
    this.el.pause();
    this.playing = false;
    this._notify();
  },

  toggle() { this.playing ? this.pause() : this.play(); },

  next() { this.select((this.idx + 1) % TRACKS.length); },
  prev() { this.select((this.idx - 1 + TRACKS.length) % TRACKS.length); },

  select(i) {
    this.idx = i % TRACKS.length;
    this._load();
    if (this.playing) this.play(); else this._notify();
  },

  setVolume(v) {
    this.el.volume = v;
    localStorage.setItem('tt_volume', v);
  },
};