var speechVoices = [];
var speechVoicesLoaded = false;

function refreshSpeechVoices() {
  if (!window.speechSynthesis) return;
  var voices = window.speechSynthesis.getVoices();
  if (voices && voices.length) {
    speechVoices = voices;
    speechVoicesLoaded = true;
  }
  return speechVoices;
}

function pickSpeechVoice(lang) {
  refreshSpeechVoices();
  var target = lang.toLowerCase();
  var exact = speechVoices.find(function(voice) {
    return String(voice.lang || '').toLowerCase() === target;
  });
  if (exact) return exact;
  var prefix = target.split('-')[0];
  return speechVoices.find(function(voice) {
    return String(voice.lang || '').toLowerCase().split('-')[0] === prefix;
  }) || null;
}

function buildSpeechUtterance(text, lang) {
  var utterance = new SpeechSynthesisUtterance(text);
  var langMap = { 'es': 'es-ES', 'en': 'en-US', 'zh': 'zh-CN' };
  utterance.lang = langMap[lang] || lang;
  var voice = pickSpeechVoice(utterance.lang);
  if (voice) utterance.voice = voice;
  utterance.rate = 0.9;
  utterance.pitch = 1;
  return utterance;
}

function doSpeak(text, lang) {
  if (!window.speechSynthesis || !text) return;
  window.speechSynthesis.cancel();
  window.speechSynthesis.speak(buildSpeechUtterance(text, lang));
}

function speakText(text, lang) {
  if (!text || !window.speechSynthesis) return;
  refreshSpeechVoices();
  if (speechVoicesLoaded) {
    doSpeak(text, lang);
    return;
  }

  var attempts = 0;
  var timer = setInterval(function() {
    attempts++;
    refreshSpeechVoices();
    if (speechVoicesLoaded || attempts >= 8) {
      clearInterval(timer);
      doSpeak(text, lang);
    }
  }, 80);
  window.speechSynthesis.getVoices();
}

function initSpeech() {
  if (!window.speechSynthesis) return;
  refreshSpeechVoices();
  window.speechSynthesis.onvoiceschanged = function() {
    refreshSpeechVoices();
  };
}

if (document.readyState === 'complete') initSpeech();
else document.addEventListener('DOMContentLoaded', initSpeech);