// ============================================================
// APP.JS — Core utilities, tabs, model selector, refine, speak
// ============================================================

// --- TAB NAVIGATION ---
document.querySelectorAll('.tab-btn').forEach(function(btn) {
  btn.addEventListener('click', function() {
    document.querySelectorAll('.tab-btn').forEach(function(b) { b.classList.remove('active'); });
    document.querySelectorAll('.tab-content').forEach(function(c) { c.classList.remove('active'); });
    btn.classList.add('active');
    document.getElementById(btn.getAttribute('data-tab') + '-tab').classList.add('active');
  });
});

// --- MODEL SELECTOR ---
var modelSelect = document.getElementById('global-model-select');
var costBadge = document.getElementById('model-cost-badge');

fetch('/api/models').then(function(r) { return r.json(); }).then(function(data) {
  if (data.models && modelSelect) {
    modelSelect.innerHTML = '';
    data.models.forEach(function(m) {
      var opt = document.createElement('option');
      opt.value = m.id;
      var prefix = m.tag === 'FREE' ? '🆓' : m.tag === 'PREMIUM' ? '👑' : m.tag === 'REASONING' ? '🧠' : '⚡';
      opt.textContent = prefix + ' ' + m.name + ' (' + m.cost + ')';
      modelSelect.appendChild(opt);
    });
    if (costBadge) costBadge.textContent = data.models[0].cost;
  }
}).catch(function() {});

function getSelectedModel() {
  return modelSelect ? modelSelect.value : 'google/gemini-2.5-flash';
}

if (modelSelect) {
  modelSelect.addEventListener('change', function() {
    fetch('/api/models').then(function(r) { return r.json(); }).then(function(data) {
      var m = data.models.find(function(x) { return x.id === modelSelect.value; });
      if (m && costBadge) costBadge.textContent = m.cost;
    });
    showToast('Model: ' + modelSelect.value.split('/').pop(), 'info');
  });
}

// --- LOADING ---
function showLoading(text) {
  document.getElementById('loading-text').textContent = text || 'Processing...';
  document.getElementById('loading-overlay').classList.remove('hidden');
}
function hideLoading() {
  document.getElementById('loading-overlay').classList.add('hidden');
}

// --- TOAST ---
function showToast(message, type) {
  var container = document.getElementById('toast-container');
  var toast = document.createElement('div');
  toast.className = 'toast toast-' + (type || 'success');
  var icon = type === 'error' ? 'exclamation-circle' : type === 'info' ? 'info-circle' : 'check-circle';
  toast.innerHTML = '<i class="fas fa-' + icon + '"></i> ' + message;
  container.appendChild(toast);
  setTimeout(function() { toast.remove(); }, 3500);
}

// --- COPY ---
function copyText(elementId) {
  var el = document.getElementById(elementId);
  var text = el.innerText || el.textContent;
  navigator.clipboard.writeText(text).then(function() {
    showToast('Copied!', 'success');
  }).catch(function() {
    var range = document.createRange();
    range.selectNode(el);
    window.getSelection().removeAllRanges();
    window.getSelection().addRange(range);
    document.execCommand('copy');
    window.getSelection().removeAllRanges();
    showToast('Copied!', 'success');
  });
}

// --- SPEAK / STOP ---
var currentlyReadingId = null;
var currentAudio = null;

function speakText(elementId) {
  if (currentlyReadingId === elementId) { stopReading(); return; }
  stopReading();
  var el = document.getElementById(elementId);
  var text = (el.innerText || el.textContent).trim();
  if (!text) { showToast('Nothing to read', 'error'); return; }

  var readBtn = findReadButton(elementId);
  useBrowserTTS(text, elementId, readBtn);
}

function useBrowserTTS(text, elementId, readBtn) {
  if (!('speechSynthesis' in window)) { showToast('TTS not supported', 'error'); return; }
  window.speechSynthesis.cancel();
  var utter = new SpeechSynthesisUtterance(text);
  utter.rate = 0.9;
  utter.onend = function() { stopReading(); };
  utter.onerror = function() { stopReading(); };
  currentlyReadingId = elementId;
  setReadButtonActive(readBtn, true);
  window.speechSynthesis.speak(utter);
  showToast('Reading — click Stop to end', 'info');
}

function stopReading() {
  if ('speechSynthesis' in window) window.speechSynthesis.cancel();
  if (currentAudio) { currentAudio.pause(); currentAudio = null; }
  if (currentlyReadingId) {
    setReadButtonActive(findReadButton(currentlyReadingId), false);
    currentlyReadingId = null;
  }
}

function findReadButton(elementId) {
  var el = document.getElementById(elementId);
  if (!el) return null;
  var card = el.closest('.output-card') || el.closest('.card');
  if (!card) return null;
  var buttons = card.querySelectorAll('button');
  for (var i = 0; i < buttons.length; i++) {
    var oc = buttons[i].getAttribute('onclick') || '';
    if (oc.indexOf('speakText') !== -1 && oc.indexOf(elementId) !== -1) return buttons[i];
  }
  return null;
}

function setReadButtonActive(btn, active) {
  if (!btn) return;
  if (active) { btn.classList.add('btn-reading'); btn.innerHTML = '<i class="fas fa-stop"></i> Stop'; }
  else { btn.classList.remove('btn-reading'); btn.innerHTML = '<i class="fas fa-volume-up"></i> Read'; }
}

// --- TIMER ---
function createTimer(el) {
  var s = 0, iv = null;
  return {
    start: function() { s = 0; this.update(); var self = this; iv = setInterval(function() { s++; self.update(); }, 1000); },
    stop: function() { if (iv) { clearInterval(iv); iv = null; } return s; },
    update: function() { el.textContent = String(Math.floor(s/60)).padStart(2,'0') + ':' + String(s%60).padStart(2,'0'); }
  };
}

// --- AUDIO RECORDER ---
function AudioRecorder() { this.mediaRecorder = null; this.chunks = []; this.stream = null; }
AudioRecorder.prototype.start = function() {
  var self = this; self.chunks = [];
  return navigator.mediaDevices.getUserMedia({ audio: { channelCount: 1, echoCancellation: true, noiseSuppression: true } })
  .then(function(stream) {
    self.stream = stream;
    var mime = MediaRecorder.isTypeSupported('audio/webm;codecs=opus') ? 'audio/webm;codecs=opus' : 'audio/webm';
    self.mediaRecorder = new MediaRecorder(stream, { mimeType: mime });
    self.mediaRecorder.ondataavailable = function(e) { if (e.data.size > 0) self.chunks.push(e.data); };
    self.mediaRecorder.start(1000);
  });
};
AudioRecorder.prototype.stop = function() {
  var self = this;
  return new Promise(function(resolve) {
    if (!self.mediaRecorder || self.mediaRecorder.state === 'inactive') { resolve(null); return; }
    self.mediaRecorder.onstop = function() {
      var blob = new Blob(self.chunks, { type: self.mediaRecorder.mimeType });
      if (self.stream) self.stream.getTracks().forEach(function(t) { t.stop(); });
      resolve(blob);
    };
    self.mediaRecorder.stop();
  });
};

// --- TRANSCRIBE HELPER ---
function transcribeAudio(blob) {
  var formData = new FormData();
  formData.append('audio', blob, 'audio.webm');
  return fetch('/api/transcribe', { method: 'POST', body: formData })
    .then(function(r) { return r.json(); });
}

// --- REFINE HELPER ---
function refineDocument(outputElementId, inputElementId) {
  var doc = document.getElementById(outputElementId).innerText.trim();
  var instructions = document.getElementById(inputElementId).value.trim();
  if (!doc) { showToast('No document to refine', 'error'); return; }
  if (!instructions) { showToast('Enter instructions for AI', 'error'); return; }

  showLoading('Refining...');

  fetch('/api/refine', {
    method: 'POST',
    headers: getAuthHeaders(),
    body: JSON.stringify({ currentDocument: doc, instructions: instructions, model: getSelectedModel() })
  })
  .then(function(r) { return r.json(); })
  .then(function(data) {
    hideLoading();
    if (data.success) {
      document.getElementById(outputElementId).textContent = data.refined;
      document.getElementById(inputElementId).value = '';
      showToast('Refined!', 'success');
    } else {
      showToast(data.error || 'Refine failed', 'error');
    }
  })
  .catch(function(err) { hideLoading(); showToast('Error: ' + err.message, 'error'); });
}

// --- SHORTEN HELPER ---
function shortenDocument(outputElementId) {
  var doc = document.getElementById(outputElementId).innerText.trim();
  if (!doc) { showToast('No document to shorten', 'error'); return; }

  showLoading('Shortening...');

  fetch('/api/shorten', {
    method: 'POST',
    headers: getAuthHeaders(),
    body: JSON.stringify({ document: doc, model: getSelectedModel() })
  })
  .then(function(r) { return r.json(); })
  .then(function(data) {
    hideLoading();
    if (data.success) {
      document.getElementById(outputElementId).textContent = data.shortened;
      showToast('Shortened!', 'success');
    } else {
      showToast(data.error || 'Failed', 'error');
    }
  })
  .catch(function(err) { hideLoading(); showToast('Error: ' + err.message, 'error'); });
}

// --- EXPORT NEXTCLOUD HELPER ---
function exportToNextcloud(elementId, docType) {
  var text = document.getElementById(elementId).innerText.trim();
  if (!text) { showToast('Nothing to export', 'error'); return; }

  var date = new Date().toISOString().split('T')[0];
  var filename = docType + '-' + date + '-' + Date.now();

  fetch('/api/nextcloud/export', {
    method: 'POST',
    headers: getAuthHeaders(),
    body: JSON.stringify({ content: text, filename: filename, type: docType })
  })
  .then(function(r) { return r.json(); })
  .then(function(data) {
    if (data.success) showToast(data.message, 'success');
    else showToast(data.error || 'Export failed', 'error');
  })
  .catch(function(err) { showToast('Nextcloud not connected. Go to Settings.', 'error'); });
}

// --- WEB SPEECH RECOGNITION HELPER ---
function createSpeechRecognition() {
  if (!(window.SpeechRecognition || window.webkitSpeechRecognition)) return null;
  var SR = window.SpeechRecognition || window.webkitSpeechRecognition;
  var rec = new SR();
  rec.continuous = true;
  rec.interimResults = true;
  rec.lang = 'en-US';
  return rec;
}

console.log('✅ App.js loaded');
// Register Service Worker for PWA
if ('serviceWorker' in navigator) {
  navigator.serviceWorker.register('/sw.js').then(function() {
    console.log('✅ PWA: Service Worker registered');
  }).catch(function(err) {
    console.log('PWA: SW registration failed', err);
  });
}