/**
 * 简单的合成狗叫声
 * 使用 Web Audio API，无需外部音频文件
 */
let audioCtx = null;

function getAudioContext() {
  if (!audioCtx) {
    const AC = window.AudioContext || window.webkitAudioContext;
    if (AC) {
      audioCtx = new AC();
    }
  }
  return audioCtx;
}

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

  // 如果 AudioContext 被暂停（某些浏览器/微信环境），先 resume
  if (ctx.state === 'suspended') {
    ctx.resume();
  }

  const now = ctx.currentTime;
  const duration = 0.18; // 吠叫持续约 180ms

  // 1. 噪声源（吠叫的嘶哑感）
  const sampleRate = ctx.sampleRate;
  const bufferSize = sampleRate * duration;
  const noiseBuffer = ctx.createBuffer(1, bufferSize, sampleRate);
  const output = noiseBuffer.getChannelData(0);
  for (let i = 0; i < bufferSize; i++) {
    output[i] = Math.random() * 2 - 1;
  }

  const noise = ctx.createBufferSource();
  noise.buffer = noiseBuffer;

  // 2. 带通滤波器，集中在 600-1200Hz 类似狗叫的频段
  const bandpass = ctx.createBiquadFilter();
  bandpass.type = 'bandpass';
  bandpass.frequency.value = 900;
  bandpass.Q.value = 0.8;

  // 3. 低频振荡器（吠叫的胸腔共鸣感）
  const osc = ctx.createOscillator();
  osc.type = 'sawtooth';
  osc.frequency.setValueAtTime(180, now);
  osc.frequency.exponentialRampToValueAtTime(120, now + duration);

  const oscGain = ctx.createGain();
  oscGain.gain.value = 0.25;

  // 4. 主音量包络：快速Attack，快速Decay
  const masterGain = ctx.createGain();
  masterGain.gain.setValueAtTime(0, now);
  masterGain.gain.linearRampToValueAtTime(0.6, now + 0.02);
  masterGain.gain.exponentialRampToValueAtTime(0.01, now + duration);

  // 连接
  noise.connect(bandpass);
  bandpass.connect(masterGain);
  osc.connect(oscGain);
  oscGain.connect(masterGain);
  masterGain.connect(ctx.destination);

  // 播放
  noise.start(now);
  noise.stop(now + duration);
  osc.start(now);
  osc.stop(now + duration);
}

export function playWinSound() {
  const ctx = getAudioContext();
  if (!ctx) return;
  if (ctx.state === 'suspended') ctx.resume();

  const now = ctx.currentTime;
  const notes = [523.25, 659.25, 783.99, 1046.50]; // C E G C'
  notes.forEach((freq, i) => {
    const osc = ctx.createOscillator();
    osc.type = 'sine';
    osc.frequency.value = freq;

    const gain = ctx.createGain();
    gain.gain.setValueAtTime(0, now + i * 0.1);
    gain.gain.linearRampToValueAtTime(0.2, now + i * 0.1 + 0.02);
    gain.gain.exponentialRampToValueAtTime(0.01, now + i * 0.1 + 0.25);

    osc.connect(gain);
    gain.connect(ctx.destination);
    osc.start(now + i * 0.1);
    osc.stop(now + i * 0.1 + 0.3);
  });
}