/**
 * Klimawächter Audio-Modul
 * ------------------------------------------------------------------
 * Kleines SFX-System auf Basis von <audio>-Elementen mit Pooling,
 * damit dasselbe SFX mehrfach kurz hintereinander abgespielt werden
 * kann (z. B. rasche Kauf-Sounds). Persistiert Volume + Mute in
 * localStorage, reagiert auf Speed 0 (Pause) indem es nichts abspielt.
 *
 * Nutzung aus dem Spiel:
 *   kwAudio.play('ui-click');
 *   kwAudio.play('build-wind');
 *   kwAudio.setVolume(0.5); // 0..1
 *   kwAudio.toggleMute();
 *
 * Alle Sound-Dateien liegen in ./assets/sounds/<name>.mp3.
 */
(function () {
  'use strict';

  const BASE = 'assets/sounds/';
  const POOL_SIZE = 3;  // parallele Instanzen pro Sound (überlappen)
  const LS_VOL = 'kw-sfx-volume';
  const LS_MUTE = 'kw-sfx-muted';

  // Mapping Welt-Event/Key → Sound-Datei. Die Keys werden vom Spiel
  // direkt als `play(key)`-Argument übergeben.
  const SOUNDS = {
    // UI + Meta
    'ui-click':           'ui-click.mp3',
    'ui-error':           'ui-error.mp3',
    'ui-confirm':         'ui-confirm.mp3',
    'achievement':        'achievement.mp3',
    'warning':            'warning.mp3',
    'praise':             'praise.mp3',
    'level-won':          'level-won.mp3',
    'level-lost':         'level-lost.mp3',
    'game-start':         'game-start.mp3',
    'demolish':           'demolish.mp3',
    // Bau-Sounds
    'build-generic':      'build-generic.mp3',
    'build-forest':       'build-forest.mp3',
    'build-solar':        'build-solar.mp3',
    'build-wind':         'build-wind.mp3',
    'build-green-roof':   'build-green-roof.mp3',
    'build-bikes':        'build-bikes.mp3',
    'build-mangrove':     'build-mangrove.mp3',
    'build-sand-fill':    'build-sand-fill.mp3',
    'build-dike':         'build-dike.mp3',
    'build-sea-wall':     'build-sea-wall.mp3',
    'build-coal':         'build-coal.mp3',
    'build-airport':      'build-airport.mp3',
    'build-cloud-seed':   'build-cloud-seed.mp3',
    // Ereignis-Sounds
    'event-temperature':  'event-temperature.mp3',
    'event-flood':        'event-flood.mp3',
    'event-vegetation':   'event-vegetation.mp3',
    'event-water':        'event-water.mp3',
    'event-glacier':      'event-glacier.mp3',
    'event-blackout':     'event-blackout.mp3',
    'event-power-back':   'event-power-back.mp3',
    'event-tourism':      'event-tourism.mp3',
    'event-co2':          'event-co2.mp3',
    // Dramatik
    'drama-paris-missed': 'drama-paris-missed.mp3',
    'drama-disaster':     'drama-disaster.mp3',
    'drama-game-over':    'drama-game-over.mp3',
  };

  // Mapping buy(measureId) → sound-key
  const BUILD_MAP = {
    'forest':     'build-forest',
    'solar':      'build-solar',
    'wind':       'build-wind',
    'green-roof': 'build-green-roof',
    'bikes':      'build-bikes',
    'mangrove':   'build-mangrove',
    'sand-fill':  'build-sand-fill',
    'dike':       'build-dike',
    'sea-wall':   'build-sea-wall',
    'coal':       'build-coal',
    'airport':    'build-airport',
    'cloud-seed': 'build-cloud-seed',
  };

  // Sound-Pools (pro Key ein Array von <audio>-Elementen im Round-Robin)
  const _pools = {};
  const _poolIdx = {};

  let _volume = parseFloat(localStorage.getItem(LS_VOL));
  if (isNaN(_volume)) _volume = 0.6;
  let _muted = localStorage.getItem(LS_MUTE) === '1';

  function _getPool(key) {
    if (_pools[key]) return _pools[key];
    const file = SOUNDS[key];
    if (!file) return null;
    const arr = [];
    for (let i = 0; i < POOL_SIZE; i++) {
      const a = new Audio(BASE + file);
      a.preload = 'auto';
      a.volume = _volume;
      arr.push(a);
    }
    _pools[key] = arr;
    _poolIdx[key] = 0;
    return arr;
  }

  function play(key, opts) {
    if (_muted) return;
    const pool = _getPool(key);
    if (!pool) { console.warn('[kwAudio] unbekannt:', key); return; }
    const idx = _poolIdx[key];
    _poolIdx[key] = (idx + 1) % pool.length;
    const a = pool[idx];
    try {
      a.currentTime = 0;
      a.volume = (opts && opts.volume != null) ? opts.volume : _volume;
      const p = a.play();
      if (p && p.catch) p.catch(() => { /* Autoplay-Policy o.ä. — ignorieren */ });
    } catch (e) { /* ignore */ }
  }

  function playForBuy(measureId) {
    const key = BUILD_MAP[measureId] || 'build-generic';
    play(key);
  }

  function setVolume(v) {
    _volume = Math.max(0, Math.min(1, v));
    localStorage.setItem(LS_VOL, String(_volume));
    for (const k in _pools) {
      for (const a of _pools[k]) a.volume = _volume;
    }
  }

  function setMuted(m) {
    _muted = !!m;
    localStorage.setItem(LS_MUTE, _muted ? '1' : '0');
    if (_muted) stopAll();
  }

  function toggleMute() { setMuted(!_muted); return _muted; }
  function isMuted()    { return _muted; }
  function getVolume()  { return _volume; }

  function stopAll() {
    for (const k in _pools) {
      for (const a of _pools[k]) { try { a.pause(); a.currentTime = 0; } catch (e) {} }
    }
  }

  // Exportieren
  window.kwAudio = {
    play,
    playForBuy,
    setVolume,
    getVolume,
    setMuted,
    isMuted,
    toggleMute,
    stopAll,
    SOUNDS,
  };
})();