function initSpeech() {
  if (!window.speechSynthesis) return;
  var voices = window.speechSynthesis.getVoices();
  if (voices.length > 0) return;
  window.speechSynthesis.onvoiceschanged = function() {};
}

function speakText(text, lang) {
  if (!text) return;
  if (!window.speechSynthesis) { return; }
  if (window.speechSynthesis.getVoices().length === 0) {
    window.speechSynthesis.onvoiceschanged = function() {
      doSpeak(text, lang);
      window.speechSynthesis.onvoiceschanged = null;
    };
    window.speechSynthesis.getVoices();
    return;
  }
  doSpeak(text, lang);
}

function doSpeak(text, lang) {
  window.speechSynthesis.cancel();
  var utterance = new SpeechSynthesisUtterance(text);
  var langMap = { 'es': 'es-ES', 'en': 'en-US', 'zh': 'zh-CN' };
  utterance.lang = langMap[lang] || lang;
  utterance.rate = 0.9;
  utterance.pitch = 1;
  window.speechSynthesis.speak(utterance);
}

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