/** Infrastructure adapter: Web Audio API sound effects. */

let audioContext: AudioContext | null = null;

function getAudioContext(): AudioContext | null {
  if (typeof window === 'undefined') return null;
  if (!audioContext) {
    try {
      audioContext = new (window.AudioContext || (window as Window & { webkitAudioContext?: typeof AudioContext }).webkitAudioContext!)();
    } catch {
      return null;
    }
  }
  return audioContext;
}

export function playHoverSound() {
  const ctx = getAudioContext();
  if (!ctx) return;

  try {
    const osc = ctx.createOscillator();
    const gain = ctx.createGain();
    const filter = ctx.createBiquadFilter();

    osc.type = 'sine';
    osc.frequency.value = 1100;
    filter.type = 'lowpass';
    filter.frequency.value = 1400;
    gain.gain.value = 0.04;

    osc.connect(filter);
    filter.connect(gain);
    gain.connect(ctx.destination);
    osc.start();
    gain.gain.linearRampToValueAtTime(0.001, ctx.currentTime + 0.12);
    setTimeout(() => osc.stop(), 150);
  } catch {
    // Silent fail
  }
}

export function playAddSound() {
  const ctx = getAudioContext();
  if (!ctx) return;

  try {
    const osc = ctx.createOscillator();
    const gain = ctx.createGain();
    const filter = ctx.createBiquadFilter();

    osc.type = 'sine';
    osc.frequency.value = 1080;
    filter.type = 'lowpass';
    filter.frequency.value = 1550;
    gain.gain.value = 0.022;

    osc.connect(filter);
    filter.connect(gain);
    gain.connect(ctx.destination);
    osc.start();
    gain.gain.linearRampToValueAtTime(0.001, ctx.currentTime + 0.08);
    setTimeout(() => osc.stop(), 120);
  } catch {
    // Silent fail
  }
}

export function playSuccessSound() {
  const ctx = getAudioContext();
  if (!ctx) return;

  try {
    const notes = [523, 659, 784, 1046];
    notes.forEach((freq, i) => {
      setTimeout(() => {
        try {
          const osc = ctx.createOscillator();
          const gain = ctx.createGain();
          const filter = ctx.createBiquadFilter();

          osc.type = 'sine';
          osc.frequency.value = freq;
          filter.type = 'lowpass';
          filter.frequency.value = 2000;
          gain.gain.value = 0.07;

          osc.connect(filter);
          filter.connect(gain);
          gain.connect(ctx.destination);
          osc.start();
          gain.gain.linearRampToValueAtTime(0.001, ctx.currentTime + 0.5);
          setTimeout(() => osc.stop(), 600);
        } catch {
          // Silent fail
        }
      }, i * 120);
    });
  } catch {
    // Silent fail
  }
}