/**
 * Flussmanagement Audio-Modul
 * ------------------------------------------------------------------
 * Kleines SFX-System auf Basis von <audio>-Elementen mit Pooling.
 * Die MP3-Dateien werden zentral via `App/scripts/generate-sounds.py fluss`
 * generiert und liegen unter ./assets/sounds/*.mp3.
 *
 * Nutzung:
 *   flAudio.play('ui-click');
 *   flAudio.play('build-deich');
 *   flAudio.setVolume(0.5);
 *   flAudio.toggleMute();
 *
 * Fehlende Dateien lassen sich still schlucken — das Spiel laeuft weiter
 * auch wenn MP3s noch nicht generiert sind.
 */
(function () {
  'use strict';

  var BASE = 'assets/sounds/';
  var POOL_SIZE = 3;
  var LS_VOL = 'fl-sfx-volume';
  var LS_MUTE = 'fl-sfx-muted';

  // Key → File
  var SOUNDS = {
    // UI + Meta
    'ui-click':            'ui-click.mp3',
    'ui-error':            'ui-error.mp3',
    'ui-confirm':          'ui-confirm.mp3',
    'achievement':         'achievement.mp3',
    'sim-start':           'sim-start.mp3',
    // Bau-Sounds
    'build-deich':         'build-deich.mp3',
    'build-feld':          'build-feld.mp3',
    'build-siedlung':      'build-siedlung.mp3',
    'build-wald':          'build-wald.mp3',
    'build-begradigen':    'build-begradigen.mp3',
    'demolish':            'demolish.mp3',
    // Wirtschaft / Zeit
    'harvest':             'harvest.mp3',
    'year-tick':           'year-tick.mp3',
    // Wetter / Ereignisse
    'event-rain':          'event-rain.mp3',
    'event-storm':         'event-storm.mp3',
    'event-drought':       'event-drought.mp3',
    'event-flood-settlement': 'event-flood-settlement.mp3',
    'event-flood-field':   'event-flood-field.mp3',
    'event-levee-break':   'event-levee-break.mp3',
    'event-tree-die':      'event-tree-die.mp3',
    // Durchgangs-Ende
    'level-won':           'level-won.mp3',
    'level-lost':          'level-lost.mp3',
  };

  // Werkzeug → Build-Sound
  var BUILD_MAP = {
    'deich':      'build-deich',
    'feld':       'build-feld',
    'siedlung':   'build-siedlung',
    'wald':       'build-wald',
    'begradigen': 'build-begradigen',
    'abriss':     'demolish',
  };

  var _pools = {}, _poolIdx = {};
  var _missing = {};
  var _volume = parseFloat(localStorage.getItem(LS_VOL));
  if (isNaN(_volume)) _volume = 0.55;
  var _muted = localStorage.getItem(LS_MUTE) === '1';

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

  function play(key) {
    if (_muted) return;
    var pool = _getPool(key);
    if (!pool) return;
    var idx = _poolIdx[key];
    var a = pool[idx];
    _poolIdx[key] = (idx + 1) % POOL_SIZE;
    try { a.currentTime = 0; a.volume = _volume; a.play().catch(function(){}); } catch (e) {}
  }

  function setVolume(v) {
    _volume = Math.max(0, Math.min(1, v));
    localStorage.setItem(LS_VOL, _volume + '');
    Object.keys(_pools).forEach(function (k) {
      _pools[k].forEach(function (a) { a.volume = _volume; });
    });
  }
  function toggleMute() {
    _muted = !_muted;
    localStorage.setItem(LS_MUTE, _muted ? '1' : '0');
    return _muted;
  }
  function isMuted() { return _muted; }
  function getVolume() { return _volume; }

  // Tool-Sound passend zum Werkzeug
  function playBuild(toolId) {
    var key = BUILD_MAP[toolId];
    if (key) play(key); else play('ui-click');
  }

  window.flAudio = {
    play: play,
    playBuild: playBuild,
    setVolume: setVolume,
    getVolume: getVolume,
    toggleMute: toggleMute,
    isMuted: isMuted,
  };
})();