// ── DOM Helpers ──

const $ = (sel) => document.querySelector(sel);
const chatEl = () => $('#chat');
const metaEl = () => $('#meta');

function esc(s) {
  const d = document.createElement('div');
  d.textContent = s;
  return d.innerHTML.replace(/"/g, '"');
}

function truncate(s, max) {
  return s && s.length > max ? s.substring(0, max) + '...' : (s || '');
}

// Auto-Scroll: wird deaktiviert wenn User nach oben scrollt, reaktiviert wenn er ganz unten ist
var _autoScroll = true;

function initAutoScroll() {
  const chat = chatEl();
  if (!chat) return;
  _autoScroll = true;
  chat.addEventListener('scroll', function() {
    const threshold = 60;
    const atBottom = chat.scrollHeight - chat.scrollTop - chat.clientHeight <= threshold;
    _autoScroll = atBottom;
  });
}

function scrollDown() {
  const chat = chatEl();
  if (!chat) return;
  if (!_autoScroll) return;
  chat.scrollTop = chat.scrollHeight;
  // Nach Font-Swap kann sich die Höhe ändern → nochmal scrollen
  document.fonts.ready.then(() => {
    if (_autoScroll) chat.scrollTop = chat.scrollHeight;
  });
}

function scrollDownForce() {
  const chat = chatEl();
  if (!chat) return;
  _autoScroll = true;
  chat.scrollTop = chat.scrollHeight;
  document.fonts.ready.then(() => {
    chat.scrollTop = chat.scrollHeight;
  });
}

function prettyModelName(model) {
  if (!model) return '?';
  model = model.split('claude-').join('');
  if (model == 'sonnet') return 'Sonnet';
  if (model == 'sonnet-4-5') return 'Sonnet 4.5';
  if (model == 'sonnet-4-6') return 'Sonnet 4.6';
  if (model == 'opus') return 'Opus';
  if (model == 'opus-4-5') return 'Opus 4.5';
  if (model == 'opus-4-6') return 'Opus 4.6';
  if (model == 'haiku') return 'Haiku';
  if (model == 'haiku-4-5') return 'Haiku 4.5';
  return 'Unbekannt (' + model + ')';
}

// ── Toast Notifications ──

function showToast(message, type) {
  type = type || 'info';
  var container = document.getElementById('toastContainer');
  if (!container) {
    container = document.createElement('div');
    container.id = 'toastContainer';
    document.body.appendChild(container);
  }
  var toast = document.createElement('div');
  toast.className = 'toast toast-' + type;
  var icon = type === 'success' ? 'fa-check-circle' : type === 'error' ? 'fa-times-circle' : 'fa-info-circle';
  toast.innerHTML = '<i class="fa ' + icon + '"></i> ' + (message || '');
  container.appendChild(toast);
  // Einblenden
  requestAnimationFrame(function() { toast.classList.add('toast-visible'); });
  // Automatisch ausblenden
  var timeout = setTimeout(function() { removeToast(toast); }, 4000);
  toast.addEventListener('click', function() {
    clearTimeout(timeout);
    removeToast(toast);
  });
}

function removeToast(toast) {
  toast.classList.remove('toast-visible');
  toast.addEventListener('transitionend', function() { toast.remove(); });
}

// ── EasyMDE Helper ──

function createMDE(element, options) {
  options = options || {};
  const mde = new EasyMDE({
    element: element,
    initialValue: options.initialValue || '',
    toolbar: options.toolbar || ['bold', 'italic', 'heading', '|', 'unordered-list', 'ordered-list', '|', 'link', 'code', '|', 'preview'],
    status: false,
    spellChecker: false,
    autoDownloadFontAwesome: false,
    autofocus: options.autofocus || false,
    minHeight: options.minHeight || '120px',
    maxHeight: options.maxHeight || undefined,
    placeholder: options.placeholder || '',
    previewClass: ['editor-preview', 'markdown']
  });
  mde.codemirror.setOption('theme', 'default');
  mde.codemirror.getWrapperElement().closest('.EasyMDEContainer').classList.add('fe-mde-wrap');
  return mde;
}

// ── Card Preview (for Picker-Select-Cards) ──

/**
 * Renders a card preview into a select-card element.
 * Used by agent picker (session-page) and session picker (cronjob-page).
 * @param {HTMLElement} cardEl - The container element
 * @param {HTMLElement|null} innerCard - Result of buildAgentCard/buildSessionCard, or null for empty state
 * @param {string} emptyIcon - FA icon class for empty state
 * @param {string} emptyText - Text for empty state
 * @param {string} changeClass - CSS class for the change indicator (e.g. 'agent-select-change', 'session-select-change')
 */
function _renderCardPreview(cardEl, innerCard, emptyIcon, emptyText, changeClass) {
  cardEl.innerHTML = '';
  if (!innerCard) {
    cardEl.innerHTML = '<div class="' + changeClass.replace('-change', '-empty') + '"><i class="fa ' + emptyIcon + '"></i> ' + emptyText + '</div>';
    return;
  }
  while (innerCard.firstChild) cardEl.appendChild(innerCard.firstChild);
  cardEl.insertAdjacentHTML('beforeend', '<span class="' + changeClass + '"><i class="fa fa-pencil"></i></span>');
}

// ── More/Expand Button ──

function initMoreButton(moreEl) {
  if (!moreEl) return;
  moreEl.addEventListener('click', () => {
    const content = moreEl.querySelector('[hidden]');
    while (content.firstChild) moreEl.parentNode.insertBefore(content.firstChild, moreEl);
    moreEl.remove();
  });
}

// ── Button Loading Helper ──

/**
 * Disables a button, sets loading text, runs async function, then restores.
 * @param {HTMLElement} btn - The button element
 * @param {string} loadingText - Text while loading (e.g. 'Speichern...')
 * @param {Function} asyncFn - Async function to run
 * @returns {Promise<*>} Result of asyncFn
 */
async function withButtonLoading(btn, loadingText, asyncFn) {
  const originalText = btn.textContent;
  const originalHtml = btn.innerHTML;
  btn.disabled = true;
  btn.textContent = loadingText;
  try {
    return await asyncFn();
  } finally {
    btn.disabled = false;
    btn.innerHTML = originalHtml;
  }
}

// ── Date Formatting ──

function formatDate(iso) {
  if (!iso) return '';
  return new Date(iso).toLocaleString('de-AT', {
    day: '2-digit', month: '2-digit', year: '2-digit',
    hour: '2-digit', minute: '2-digit'
  });
}

function formatTimestamp(isoString) {
  if (!isoString) return '';
  var d = new Date(isoString);
  if (isNaN(d.getTime())) return '';
  var dd = String(d.getDate()).padStart(2, '0');
  var mm = String(d.getMonth() + 1).padStart(2, '0');
  var yyyy = d.getFullYear();
  var hh = String(d.getHours()).padStart(2, '0');
  var min = String(d.getMinutes()).padStart(2, '0');
  var ss = String(d.getSeconds()).padStart(2, '0');
  return dd + '.' + mm + '.' + yyyy + ' ' + hh + ':' + min + ':' + ss;
}

// ── Meta Bar ──

function setMeta(text) {
  metaEl().textContent = text;
}

function setMetaHtml(html) {
  metaEl().innerHTML = html;
}

// ── Older Messages Button ──

function showOlderMessagesButton(remainingCount) {
  removeOlderMessagesButton();
  const btn = document.createElement('button');
  btn.className = 'archive-load-btn older-messages-btn';
  btn.innerHTML = '<i class="fa fa-arrow-up"></i> ' + remainingCount + ' ältere Nachrichten laden';
  btn.addEventListener('click', () => loadOlderMessages());
  chatEl().prepend(btn);
}

function removeOlderMessagesButton() {
  const btn = chatEl().querySelector('.older-messages-btn');
  if (btn) btn.remove();
}

// ── Archive Button ──

function showArchiveLoadButton() {
  const existing = chatEl().querySelector('.archive-load-btn:not(.older-messages-btn)');
  if (existing) existing.remove();

  const btn = document.createElement('button');
  btn.className = 'archive-load-btn';
  btn.innerHTML = '<i class="fa fa-archive"></i> Archivierte Nachrichten laden';
  btn.addEventListener('click', loadLatestArchive);

  // Immer ganz oben im Chat (aber nach dem older-messages-btn falls vorhanden)
  const olderBtn = chatEl().querySelector('.older-messages-btn');
  if (olderBtn) {
    olderBtn.after(btn);
  } else {
    chatEl().prepend(btn);
  }
}

function removeArchiveLoadButton() {
  const btns = chatEl().querySelectorAll('.archive-load-btn:not(.older-messages-btn)');
  btns.forEach(b => b.remove());
}

// ── Review/Sub-Agent Helpers ──

function _isReviewMessage(content) {
  return content && (content.startsWith('[Review:') || content.startsWith('[Review-Feedback') || content.startsWith('[Finalizer:') || content.startsWith('[Preparer:'));
}

/**
 * Returns { icon, defaultName } for a sub-agent type.
 * @param {string} agentType - 'preparer', 'finalizer', or 'review'
 */
function _getSubAgentMeta(agentType) {
  if (agentType === 'preparer') return { icon: 'fa-filter', defaultName: 'Vorbereiter-Agent' };
  if (agentType === 'finalizer') return { icon: 'fa-flag-checkered', defaultName: 'Finalizer-Agent' };
  return { icon: 'fa-check-circle-o', defaultName: 'Review-Agent' };
}

/**
 * Creates a review/sub-agent header element.
 * @param {string} agentType - 'preparer', 'finalizer', or 'review'
 * @param {string} agentName - Display name of the agent
 * @param {object} [extra] - Optional: { round, maxRounds } for review
 */
function _createSubAgentHeader(agentType, agentName, extra) {
  var meta = _getSubAgentMeta(agentType);
  var header = document.createElement('div');
  header.className = 'review-header';
  var html = '<i class="fa ' + meta.icon + '"></i> <strong>' + esc(agentName || meta.defaultName) + '</strong>';
  if (agentType === 'review' && extra && extra.round) {
    html += ' <span class="review-round">Runde ' + extra.round + '/' + extra.maxRounds + '</span>';
  }
  header.innerHTML = html;
  return header;
}

// ── Streamed Elements ──

function removeStreamedElements() {
  chatEl().querySelectorAll('.streamed').forEach(el => el.remove());
}