// utils.js — 工具函数

const DEV = new URLSearchParams(location.search).has('dev');
const TEST = new URLSearchParams(location.search).has('test');

const sleep = ms => new Promise(r => setTimeout(r, ms));

function dbg(msg) {
  const el = document.getElementById('dbg');
  if (el && el.style.display !== 'none') el.textContent = msg;
}

// TTS — 仅用于朗读文字消息内容，不用于任何 UI 反馈
const TTS = {
  _voices: [],
  init() {
    if (!window.speechSynthesis) return;
    const load = () => { this._voices = speechSynthesis.getVoices(); };
    load();
    speechSynthesis.onvoiceschanged = load;
  },
  _pick() {
    return this._voices.find(v => v.lang.startsWith('zh') || v.name.includes('Chinese'))
           || this._voices[0] || null;
  },
  get available() { return !!window.speechSynthesis; },
  speak(text, { rate = 0.85, volume = 0.8 } = {}) {
    return new Promise(resolve => {
      if (!window.speechSynthesis) { resolve(false); return; }
      speechSynthesis.cancel();
      const u = new SpeechSynthesisUtterance(text);
      u.lang = 'zh-CN'; u.rate = rate; u.volume = volume;
      const v = this._pick();
      if (v) u.voice = v;
      u.onend = () => resolve(true);
      u.onerror = () => resolve(false);
      speechSynthesis.speak(u);
    });
  },
  stop() { if (window.speechSynthesis) speechSynthesis.cancel(); },
};