sound.js

// TileLoom sound effects — synthesized with WebAudio, no audio files.

'use strict';

const Sound = (() => {
  let ctx = null;
  let muted = false;
  try { muted = localStorage.getItem('tileloom-muted') === '1'; } catch (e) { /* ignore */ }

  function ac() {
    if (!ctx) {
      const AC = window.AudioContext || window.webkitAudioContext;
      if (!AC) return null;
      ctx = new AC();
    }
    if (ctx.state === 'suspended') ctx.resume().catch(() => {});
    return ctx;
  }

  // Browsers only allow audio after a user gesture; warm the context up early
  document.addEventListener('pointerdown', () => { if (!muted) ac(); }, { once: true, capture: true });

  function tone(freq, dur, opts = {}) {
    const c = ac();
    if (!c) return;
    const t0 = c.currentTime + (opts.delay || 0);
    const o = c.createOscillator();
    const g = c.createGain();
    o.type = opts.type || 'sine';
    o.frequency.setValueAtTime(freq, t0);
    if (opts.slide) o.frequency.exponentialRampToValueAtTime(opts.slide, t0 + dur);
    g.gain.setValueAtTime(0.0001, t0);
    g.gain.exponentialRampToValueAtTime(opts.gain || 0.15, t0 + 0.01);
    g.gain.exponentialRampToValueAtTime(0.0001, t0 + dur);
    o.connect(g).connect(c.destination);
    o.start(t0);
    o.stop(t0 + dur + 0.02);
  }

  const FX = {
    place() { tone(520, 0.07, { type: 'triangle', slide: 300, gain: 0.2 }); tone(1600, 0.03, { type: 'square', gain: 0.05 }); },
    pickup() { tone(700, 0.05, { type: 'triangle', slide: 950, gain: 0.12 }); },
    invalid() { tone(220, 0.18, { type: 'sawtooth', slide: 140, gain: 0.1 }); },
    word() { [523, 659, 784].forEach((f, i) => tone(f, 0.12, { delay: i * 0.06, gain: 0.12 })); },
    bingo() { [523, 659, 784, 1047, 1319].forEach((f, i) => tone(f, 0.16, { delay: i * 0.07, gain: 0.14 })); },
    swap() { tone(300, 0.12, { type: 'triangle', slide: 900, gain: 0.1 }); },
    win() { [392, 523, 659, 784, 1047].forEach((f, i) => tone(f, 0.22, { delay: i * 0.12, gain: 0.15 })); },
    lose() { [440, 330, 247].forEach((f, i) => tone(f, 0.25, { delay: i * 0.14, type: 'triangle', gain: 0.12 })); },
  };

  function play(name) {
    if (muted) return;
    try { if (FX[name]) FX[name](); } catch (e) { /* audio is best-effort */ }
  }

  function toggleMute() {
    muted = !muted;
    try { localStorage.setItem('tileloom-muted', muted ? '1' : '0'); } catch (e) { /* ignore */ }
    return muted;
  }

  return { play, toggleMute, get muted() { return muted; } };
})();