/* Neon Rampage — synthesized audio (WebAudio). All sounds generated at runtime. */
(function () {
  'use strict';

  var US = (window.US = window.US || {});
  var ctx = null;
  var master = null;
  var sfxGain = null;
  var musicGain = null;
  var musicTimer = null;
  var step = 0;
  var windSrc = null;   // { src, lfo }

  function ensure() {
    if (ctx) return true;
    try {
      var AC = window.AudioContext || window.webkitAudioContext;
      if (!AC) return false;
      ctx = new AC();
      master = ctx.createGain();
      master.gain.value = 0.9;
      master.connect(ctx.destination);
      sfxGain = ctx.createGain();
      sfxGain.gain.value = US.save.get().settings.sfx;
      sfxGain.connect(master);
      musicGain = ctx.createGain();
      musicGain.gain.value = US.save.get().settings.music * 0.5;
      musicGain.connect(master);
      return true;
    } catch (e) { return false; }
  }

  function resume() {
    if (!ensure()) return;
    if (ctx.state === 'suspended') ctx.resume();
  }

  // Generic one-shot: oscillator with pitch slide + optional noise burst.
  function tone(opts) {
    if (!ensure() || ctx.state === 'suspended') { if (!resume()) return; }
    var t = ctx.currentTime;
    var o = ctx.createOscillator();
    var g = ctx.createGain();
    o.type = opts.type || 'square';
    o.frequency.setValueAtTime(opts.f0 || 440, t);
    if (opts.f1) o.frequency.exponentialRampToValueAtTime(Math.max(20, opts.f1), t + (opts.dur || 0.15));
    g.gain.setValueAtTime(0.0001, t);
    g.gain.exponentialRampToValueAtTime(opts.vol || 0.2, t + 0.008);
    g.gain.exponentialRampToValueAtTime(0.0001, t + (opts.dur || 0.15));
    o.connect(g); g.connect(sfxGain);
    o.start(t); o.stop(t + (opts.dur || 0.15) + 0.05);

    if (opts.noise) {
      var len = Math.floor(ctx.sampleRate * (opts.noiseDur || 0.12));
      var buf = ctx.createBuffer(1, len, ctx.sampleRate);
      var d = buf.getChannelData(0);
      for (var i = 0; i < len; i++) d[i] = (Math.random() * 2 - 1) * (1 - i / len);
      var src = ctx.createBufferSource();
      src.buffer = buf;
      var ng = ctx.createGain();
      ng.gain.value = opts.noiseVol || 0.25;
      src.connect(ng); ng.connect(sfxGain);
      src.start(t);
    }
  }

  var SFX = {
    shoot:   function () { tone({ type: 'square', f0: 720, f1: 160, dur: 0.07, vol: 0.10 }); },
    shotgun: function () { tone({ type: 'sawtooth', f0: 300, f1: 90, dur: 0.16, vol: 0.18, noise: true, noiseVol: 0.2 }); },
    rail:    function () { tone({ type: 'sawtooth', f0: 1400, f1: 200, dur: 0.22, vol: 0.14 }); },
    rocket:  function () { tone({ type: 'triangle', f0: 220, f1: 60, dur: 0.3, vol: 0.2, noise: true }); },
    smg:     function () { tone({ type: 'square', f0: 520, f1: 140, dur: 0.05, vol: 0.07 }); },
    hit:     function () { tone({ type: 'triangle', f0: 300, f1: 120, dur: 0.05, vol: 0.08 }); },
    kill:    function () { tone({ type: 'square', f0: 260, f1: 520, dur: 0.09, vol: 0.10 }); },
    explode: function () { tone({ type: 'sawtooth', f0: 130, f1: 40, dur: 0.4, vol: 0.28, noise: true, noiseVol: 0.35, noiseDur: 0.3 }); },
    hurt:    function () { tone({ type: 'sawtooth', f0: 180, f1: 70, dur: 0.18, vol: 0.22 }); },
    pickup:  function () { tone({ type: 'sine', f0: 620, f1: 1240, dur: 0.09, vol: 0.12 }); },
    heal:    function () { tone({ type: 'sine', f0: 440, f1: 880, dur: 0.18, vol: 0.14 }); },
    card:    function () { tone({ type: 'sine', f0: 500, f1: 1000, dur: 0.14, vol: 0.13 }); },
    onfire:  function () {
      [523, 659, 784, 1047].forEach(function (f, i) {
        setTimeout(function () { tone({ type: 'square', f0: f, dur: 0.12, vol: 0.16 }); }, i * 70);
      });
    },
    ult:     function () { tone({ type: 'sawtooth', f0: 80, f1: 900, dur: 0.5, vol: 0.3, noise: true, noiseVol: 0.3 }); },
    bomb:    function () { tone({ type: 'sawtooth', f0: 100, f1: 30, dur: 0.6, vol: 0.32, noise: true, noiseVol: 0.45, noiseDur: 0.5 }); },
    bossRoar:function () { tone({ type: 'sawtooth', f0: 90, f1: 45, dur: 0.7, vol: 0.3, noise: true, noiseVol: 0.2 }); },
    stomp: function (vol) {
      var v = vol || 0.18;
      tone({ type: 'sine', f0: 85, f1: 26, dur: 0.17, vol: v });
      tone({ type: 'triangle', f0: 55, f1: 22, dur: 0.24, vol: v * 0.7 });
    },
    ui:      function () { tone({ type: 'sine', f0: 700, f1: 900, dur: 0.05, vol: 0.08 }); },
    buy:     function () { [660, 880].forEach(function (f, i) { setTimeout(function () { tone({ type: 'sine', f0: f, dur: 0.1, vol: 0.12 }); }, i * 90); }); },
    lose:    function () { [392, 330, 262, 196].forEach(function (f, i) { setTimeout(function () { tone({ type: 'triangle', f0: f, dur: 0.22, vol: 0.16 }); }, i * 160); }); },
    win:     function () { [523, 659, 784, 1047, 1319].forEach(function (f, i) { setTimeout(function () { tone({ type: 'square', f0: f, dur: 0.15, vol: 0.14 }); }, i * 110); }); }
  };

  /* --- tiny procedural music loop: dark synthwave bass + hats --- */
  var BASS = [0, 0, 7, 0, 5, 5, 3, 7]; // semitone offsets from A1
  function note(semi) { return 55 * Math.pow(2, semi / 12); }

  function musicStep() {
    if (!ctx || !musicOn) return;
    var t = ctx.currentTime;
    // bass
    var o = ctx.createOscillator();
    var g = ctx.createGain();
    o.type = 'sawtooth';
    var root = BASS[Math.floor(step / 2) % BASS.length];
    var playingBoss = US.game && US.game.isBossWave && US.game.isBossWave();
    var mul = playingBoss ? Math.pow(2, 3 / 12) : 1;
    o.frequency.value = note(root) * mul;
    g.gain.setValueAtTime(0.0001, t);
    g.gain.exponentialRampToValueAtTime(0.22, t + 0.02);
    g.gain.exponentialRampToValueAtTime(0.0001, t + 0.24);
    o.connect(g); g.connect(musicGain);
    o.start(t); o.stop(t + 0.3);
    // hat every other step
    if (step % 2 === 1) {
      var len = Math.floor(ctx.sampleRate * 0.03);
      var buf = ctx.createBuffer(1, len, ctx.sampleRate);
      var d = buf.getChannelData(0);
      for (var i = 0; i < len; i++) d[i] = (Math.random() * 2 - 1) * (1 - i / len);
      var src = ctx.createBufferSource();
      src.buffer = buf;
      var hg = ctx.createGain(); hg.gain.value = 0.05;
      src.connect(hg); hg.connect(musicGain);
      src.start(t);
    }
    step++;
  }

  var musicOn = false;

  /* --- wind ambience: filtered brown noise with slow gusts --- */
  var ambGain = null;

  function startWind() {
    if (!ctx || windSrc || !musicOn) return;
    var len = ctx.sampleRate * 2;
    var buf = ctx.createBuffer(1, len, ctx.sampleRate);
    var d = buf.getChannelData(0);
    var lastV = 0;
    for (var i = 0; i < len; i++) {
      var wn = Math.random() * 2 - 1;
      lastV = (lastV + 0.02 * wn) / 1.02;   // brown-ish noise
      d[i] = lastV * 3.5;
    }
    var src = ctx.createBufferSource();
    src.buffer = buf;
    src.loop = true;
    var lp = ctx.createBiquadFilter();
    lp.type = 'lowpass';
    lp.frequency.value = 300;
    lp.Q.value = 0.7;
    // gust LFO breathing on the filter
    var lfo = ctx.createOscillator();
    lfo.frequency.value = 0.11;
    var lfoG = ctx.createGain();
    lfoG.gain.value = 150;
    lfo.connect(lfoG);
    lfoG.connect(lp.frequency);
    ambGain = ctx.createGain();
    ambGain.gain.value = 0;
    src.connect(lp);
    lp.connect(ambGain);
    ambGain.connect(musicGain);
    try {
      ambGain.gain.linearRampToValueAtTime(0.5, ctx.currentTime + 2.5);
      src.start();
      lfo.start();
      windSrc = { src: src, lfo: lfo };
    } catch (e) { /* autoplay quirks */ }
  }

  function stopWind() {
    if (!windSrc) return;
    try {
      ambGain.gain.linearRampToValueAtTime(0, ctx.currentTime + 0.4);
      var w = windSrc;
      setTimeout(function () {
        try { w.src.stop(); w.lfo.stop(); } catch (e) {}
      }, 450);
    } catch (e) {}
    windSrc = null;
  }

  US.audio = {
    resume: resume,
    sfx: function (name) {
      if (!ensure()) return;
      sfxGain.gain.value = US.save.get().settings.sfx;
      if (SFX[name]) SFX[name].apply(null, Array.prototype.slice.call(arguments, 1));
    },
    setVolumes: function () {
      if (!ctx) return;
      sfxGain.gain.value = US.save.get().settings.sfx;
      musicGain.gain.value = US.save.get().settings.music * 0.5;
    },
    startMusic: function () {
      if (!ensure()) return;
      resume();
      if (!musicTimer) {
        musicOn = true;
        musicStep();
        musicTimer = setInterval(musicStep, 250);
      }
      startWind();
    },
    stopMusic: function () {
      musicOn = false;
      if (musicTimer) { clearInterval(musicTimer); musicTimer = null; }
      stopWind();
    },
    hoverTick: function () {
      if (!ensure()) return;
      tone({ type: 'sine', f0: 900, f1: 1100, dur: 0.035, vol: 0.05 });
    },
    thunder: function () {
      if (!ensure()) return;
      tone({ type: 'sawtooth', f0: 52, f1: 22, dur: 1.2, vol: 0.3, noise: true, noiseVol: 0.55, noiseDur: 1.3 });
    },
    distantRoar: function () {
      if (!ensure()) return;
      tone({ type: 'sawtooth', f0: 120, f1: 36, dur: 1.5, vol: 0.09 });
      setTimeout(function () {
        tone({ type: 'triangle', f0: 70, f1: 28, dur: 1.9, vol: 0.07 });
      }, 180);
    }
  };
})();