// ============================================================
// VOICE PREFERENCES — STT Model & TTS Voice selection
// ============================================================

(function() {
  var _inited = false;

  // Listen for tab changes (correct event name is 'tabChanged' not 'tab-loaded')
  document.addEventListener('tabChanged', function(e) {
    if (e.detail.tab !== 'settings' || _inited) return;
    _inited = true;
    console.log('[VoicePrefs] Initializing on settings tab load...');
    // Small delay to ensure DOM is ready
    setTimeout(function() {
      initVoicePreferences();
    }, 100);
  });

  // Also init on DOMContentLoaded as backup for direct page load
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', function() {
      setTimeout(function() {
        if (!_inited && document.getElementById('btn-preview-voice')) {
          console.log('[VoicePrefs] Init via DOMContentLoaded (direct settings page load)');
          _inited = true;
          initVoicePreferences();
        }
      }, 500);
    });
  } else {
    // Page already loaded, init immediately if on settings
    setTimeout(function() {
      if (!_inited && document.getElementById('btn-preview-voice')) {
        console.log('[VoicePrefs] Init immediate (page already loaded)');
        _inited = true;
        initVoicePreferences();
      }
    }, 500);
  }

  function initVoicePreferences() {
    console.log('[VoicePrefs] initVoicePreferences called');

    loadVoiceOptions();
    loadUserPreferences();

    // Save button
    var btnSave = document.getElementById('btn-save-voice-prefs');
    if (btnSave) {
      console.log('[VoicePrefs] Save button found, adding listener');
      btnSave.addEventListener('click', saveVoicePreferences);
    } else {
      console.warn('[VoicePrefs] Save button NOT found');
    }

    // Preview button
    var btnPreview = document.getElementById('btn-preview-voice');
    if (btnPreview) {
      console.log('[VoicePrefs] Preview button found, adding listener');
      btnPreview.addEventListener('click', function(e) {
        console.log('[VoicePrefs] Preview button clicked!');
        e.preventDefault();
        previewVoice();
      });
    } else {
      console.warn('[VoicePrefs] Preview button NOT found');
    }
  }

  function loadVoiceOptions() {
    fetch('/api/user/preferences/options', {
      headers: getAuthHeaders()
    })
    .then(function(r) { return r.json(); })
    .then(function(data) {
      if (!data.success) return;

      // Populate STT models
      var sttSelect = document.getElementById('stt-model-select');
      if (sttSelect && data.sttModels && data.sttModels.length > 0) {
        sttSelect.innerHTML = '<option value="">Server default (' + data.sttProvider + ')</option>';
        data.sttModels.forEach(function(model) {
          var opt = document.createElement('option');
          opt.value = model.value;
          opt.textContent = model.label;
          sttSelect.appendChild(opt);
        });
      }

      // Populate TTS voices
      var ttsSelect = document.getElementById('tts-voice-select');
      if (ttsSelect && data.ttsVoices && data.ttsVoices.length > 0) {
        ttsSelect.innerHTML = '<option value="">Server default (' + data.ttsProvider + ')</option>';
        data.ttsVoices.forEach(function(voice) {
          var opt = document.createElement('option');
          opt.value = voice.value;
          opt.textContent = voice.label;
          ttsSelect.appendChild(opt);
        });
      }
    })
    .catch(function(err) {
      console.error('[VoicePrefs] Failed to load options:', err.message);
    });
  }

  function loadUserPreferences() {
    fetch('/api/user/preferences', {
      headers: getAuthHeaders()
    })
    .then(function(r) { return r.json(); })
    .then(function(data) {
      if (!data.success) return;

      var sttSelect = document.getElementById('stt-model-select');
      if (sttSelect && data.stt_model) {
        sttSelect.value = data.stt_model;
      }

      var ttsSelect = document.getElementById('tts-voice-select');
      if (ttsSelect && data.tts_voice) {
        ttsSelect.value = data.tts_voice;
      }
    })
    .catch(function(err) {
      console.error('[VoicePrefs] Failed to load preferences:', err.message);
    });
  }

  function saveVoicePreferences() {
    var sttSelect = document.getElementById('stt-model-select');
    var ttsSelect = document.getElementById('tts-voice-select');

    var sttModel = sttSelect ? sttSelect.value : null;
    var ttsVoice = ttsSelect ? ttsSelect.value : null;

    fetch('/api/user/preferences', {
      method: 'POST',
      headers: getAuthHeaders(),
      body: JSON.stringify({
        stt_model: sttModel || null,
        tts_voice: ttsVoice || null
      })
    })
    .then(function(r) { return r.json(); })
    .then(function(data) {
      if (data.success) {
        showToast('Voice preferences saved!', 'success');
      } else {
        showToast(data.error || 'Failed to save', 'error');
      }
    })
    .catch(function(err) {
      showToast('Save failed: ' + err.message, 'error');
    });
  }

  function previewVoice() {
    var ttsSelect = document.getElementById('tts-voice-select');
    var voice = ttsSelect ? ttsSelect.value : null;

    // Allow "Server default" (empty value) to preview
    var displayVoice = voice || 'server default';
    var text = 'Hello, this is a preview of the ' + displayVoice + ' voice. This is how your read-aloud feature will sound.';

    var btnPreview = document.getElementById('btn-preview-voice');
    if (btnPreview) {
      btnPreview.disabled = true;
      btnPreview.innerHTML = '<i class="fas fa-spinner fa-spin"></i> Loading...';
    }

    // Save current preference temporarily (or clear it if "server default" selected)
    fetch('/api/user/preferences', {
      method: 'POST',
      headers: getAuthHeaders(),
      body: JSON.stringify({ tts_voice: voice || null })
    })
    .then(function() {
      // Generate audio with new voice
      return fetch('/api/text-to-speech', {
        method: 'POST',
        headers: getAuthHeaders(),
        body: JSON.stringify({ text: text })
      });
    })
    .then(function(r) {
      if (!r.ok) throw new Error('Preview failed');
      return r.blob();
    })
    .then(function(blob) {
      var url = URL.createObjectURL(blob);
      var audio = new Audio(url);
      audio.onended = function() { URL.revokeObjectURL(url); };
      audio.play();
      showToast('Preview: ' + voice, 'success');
    })
    .catch(function(err) {
      console.error('[VoicePrefs] Preview error:', err);
      showToast('Preview failed: ' + err.message, 'error');
    })
    .finally(function() {
      if (btnPreview) {
        btnPreview.disabled = false;
        btnPreview.innerHTML = '<i class="fas fa-play"></i> Preview';
      }
    });
  }

})();