// ── 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;
}

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

function scrollDown() {
  const chat = chatEl();
  if (!chat) return;
  chat.scrollTop = chat.scrollHeight;
  // Nach Font-Swap kann sich die Höhe ändern → nochmal scrollen
  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',
    placeholder: options.placeholder || '',
    previewClass: ['editor-preview', 'markdown']
  });
  mde.codemirror.setOption('theme', 'default');
  mde.codemirror.getWrapperElement().closest('.EasyMDEContainer').classList.add('fe-mde-wrap');
  return mde;
}

// ── 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());
}

// ── Streamed Elements ──

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