const _SETTINGS_SPEECH_STORAGE_KEYS={
  tts_engine:'hermes-tts-engine',
  tts_voice:'hermes-tts-voice',
  tts_rate:'hermes-tts-rate',
};
let _settingsSpeechChangedKeys=new Set();

function _speechPreferencesPayloadFromUi(){
  const payload={};
  const ttsVoiceSel=$('settingsTtsVoice');
  if(ttsVoiceSel) _setOwnedSpeechPayload(payload,'tts_voice',ttsVoiceSel.value||'');
  return payload;
}

function loadSettingsPanel(){
  const ttsEngineSel=$('settingsTtsEngine');
  if(ttsEngineSel){
    ttsEngineSel.onchange=function(){
        localStorage.setItem('hermes-tts-engine',this.value);
        window._populateTtsVoices();
        _schedulePreferencesAutosave();
    };
  }
    // Populate voice selector based on engine
    const ttsVoiceSel=$('settingsTtsVoice');
    window._populateTtsVoices=function(){
      if(!ttsVoiceSel) return;
      const engine=localStorage.getItem('hermes-tts-engine')||'browser';
      const current=String(_speechSetting('tts_voice','hermes-tts-voice','')||'');
      _syncSpeechPreferenceCache('tts_voice',current);
      if(engine==='edge'){
        const edgeVoices=[
          {value:'en-US-AriaNeural',label:'Aria (English, Female)'},
        ];
        ttsVoiceSel.innerHTML='<option value="">Default (Xiaoxiao)</option>';
        edgeVoices.forEach(v=>ttsVoiceSel.appendChild(v));
      }
    };
    if(ttsVoiceSel&&'speechSynthesis' in window){
      window._populateTtsVoices();
      ttsVoiceSel.onchange=function(){_markSpeechPreferenceChanged('tts_voice');localStorage.setItem('hermes-tts-voice',this.value);_schedulePreferencesAutosave();};
    }
    // TTS rate/pitch sliders
}