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

document.addEventListener('DOMContentLoaded', function() {

  // --- 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');
      var tabId = btn.getAttribute('data-tab') + '-tab';
      var tabEl = document.getElementById(tabId);
      if (tabEl) tabEl.classList.add('active');
    });
  });

  // --- MODEL SELECTOR ---
  var modelSelect = document.getElementById('global-model-select');
  var costBadge = document.getElementById('model-cost-badge');
  window._currentModels = [];
  window._currentProvider = 'openrouter';

  fetch('/api/models')
    .then(function(r) { return r.json(); })
    .then(function(data) {
      window._currentModels = data.models || [];
      window._currentProvider = data.provider || 'openrouter';

      var categories = { free: '🆓 Free', fast: '⚡ Fast & Cheap', smart: '🧠 Smart', premium: '👑 Premium' };

      function buildModelOptions(selectEl) {
        selectEl.innerHTML = '';
        var grouped = {};
        window._currentModels.forEach(function(m) {
          var cat = m.category || 'smart';
          if (!grouped[cat]) grouped[cat] = [];
          grouped[cat].push(m);
        });
        Object.keys(categories).forEach(function(cat) {
          if (!grouped[cat] || grouped[cat].length === 0) return;
          var optgroup = document.createElement('optgroup');
          optgroup.label = categories[cat];
          grouped[cat].forEach(function(m) {
            var opt = document.createElement('option');
            opt.value = m.id;
            opt.textContent = m.name + ' (' + m.cost + ')';
            optgroup.appendChild(opt);
          });
          selectEl.appendChild(optgroup);
        });
      }

      if (modelSelect && window._currentModels.length > 0) {
        buildModelOptions(modelSelect);
        if (costBadge) costBadge.textContent = window._currentProvider.toUpperCase() + ' | ' + window._currentModels[0].cost;
      }

      // Populate all per-tab model selectors
      document.querySelectorAll('.tab-model-select').forEach(function(sel) {
        buildModelOptions(sel);
      });
    })
    .catch(function(err) { console.warn('Models load failed:', err); });

  if (modelSelect) {
    modelSelect.addEventListener('change', function() {
      var m = window._currentModels.find(function(x) { return x.id === modelSelect.value; });
      if (m && costBadge) costBadge.textContent = window._currentProvider.toUpperCase() + ' | ' + m.cost;
      showToast('Model: ' + modelSelect.value.split('/').pop(), 'info');
    });
  }

  console.log('✅ App.js DOM ready');

}); // end DOMContentLoaded

// ============================================================
// GLOBAL FUNCTIONS (must be outside DOMContentLoaded)
// ============================================================

function getSelectedModel() {
  // Prefer the active tab's own model selector if present
  var activeTab = document.querySelector('.tab-content.active');
  if (activeTab) {
    var tabSel = activeTab.querySelector('.tab-model-select');
    if (tabSel && tabSel.value) return tabSel.value;
  }
  var sel = document.getElementById('global-model-select');
  return sel ? sel.value : 'google/gemini-2.5-flash';
}

function showLoading(text) {
  var overlay = document.getElementById('loading-overlay');
  var textEl = document.getElementById('loading-text');
  if (textEl) textEl.textContent = text || 'Processing...';
  if (overlay) { overlay.style.display = 'flex'; overlay.className = overlay.className.replace('hidden', '').trim(); }
}

function hideLoading() {
  var overlay = document.getElementById('loading-overlay');
  if (overlay) overlay.style.display = 'none';
}

function showToast(message, type) {
  var container = document.getElementById('toast-container');
  if (!container) { console.log('Toast:', type, message); return; }
  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);
}

function copyText(elementId) {
  var el = document.getElementById(elementId);
  if (!el) return;
  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);
  if (!el) return;
  var text = (el.innerText || el.textContent).trim();
  if (!text) { showToast('Nothing to read', 'error'); return; }
  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;
  var btn = findReadButton(elementId);
  if (btn) { btn.classList.add('btn-reading'); btn.innerHTML = '<i class="fas fa-stop"></i> Stop'; }
  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) {
    var btn = findReadButton(currentlyReadingId);
    if (btn) { btn.classList.remove('btn-reading'); btn.innerHTML = '<i class="fas fa-volume-up"></i> Read'; }
    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;
}

// 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();
  });
};

function transcribeAudio(blob) {
  var formData = new FormData();
  formData.append('audio', blob, 'audio.webm');
  return fetch('/api/transcribe', {
    method: 'POST',
    headers: { 'Authorization': 'Bearer ' + (window.AUTH_TOKEN || localStorage.getItem('ped_scribe_token') || '') },
    body: formData
  }).then(function(r) { return r.json(); });
}

function refineDocument(outputElementId, inputElementId) {
  var doc = document.getElementById(outputElementId);
  var input = document.getElementById(inputElementId);
  if (!doc || !input) return;
  var docText = doc.innerText.trim();
  var instructions = input.value.trim();
  if (!docText) { showToast('No document', 'error'); return; }
  if (!instructions) { showToast('Enter instructions', 'error'); return; }
  showLoading('Refining...');
  fetch('/api/refine', {
    method: 'POST', headers: getAuthHeaders(),
    body: JSON.stringify({ currentDocument: docText, instructions: instructions, model: getSelectedModel() })
  })
  .then(function(r) { return r.json(); })
  .then(function(data) {
    hideLoading();
    if (data.success) { doc.textContent = data.refined; input.value = ''; showToast('Refined!', 'success'); }
    else showToast(data.error || 'Failed', 'error');
  })
  .catch(function(err) { hideLoading(); showToast(err.message, 'error'); });
}

function shortenDocument(outputElementId) {
  var doc = document.getElementById(outputElementId);
  if (!doc) return;
  var text = doc.innerText.trim();
  if (!text) { showToast('No document', 'error'); return; }
  showLoading('Shortening...');
  fetch('/api/shorten', {
    method: 'POST', headers: getAuthHeaders(),
    body: JSON.stringify({ document: text, model: getSelectedModel() })
  })
  .then(function(r) { return r.json(); })
  .then(function(data) {
    hideLoading();
    if (data.success) { doc.textContent = data.shortened; showToast('Shortened!', 'success'); }
    else showToast(data.error || 'Failed', 'error');
  })
  .catch(function(err) { hideLoading(); showToast(err.message, 'error'); });
}

function exportToNextcloud(elementId, docType) {
  var el = document.getElementById(elementId);
  if (!el) return;
  var text = el.innerText.trim();
  if (!text) { showToast('Nothing to export', 'error'); return; }
  fetch('/api/nextcloud/export', {
    method: 'POST', headers: getAuthHeaders(),
    body: JSON.stringify({ content: text, filename: docType + '-' + Date.now(), 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() { showToast('Nextcloud not connected', 'error'); });
}

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;
}

// PWA Service Worker
if ('serviceWorker' in navigator) {
  navigator.serviceWorker.register('/sw.js').catch(function() {});
}

console.log('✅ App.js loaded');