const favoriteIcons = {
  star: '<polygon points="12 2 15 8.5 22 9.3 16.8 14 18.2 21 12 17.4 5.8 21 7.2 14 2 9.3 9 8.5 12 2"></polygon>',
  link: '<path d="M10 13a5 5 0 0 0 7.1 0l2.8-2.8a5 5 0 0 0-7.1-7.1l-1.6 1.6"></path><path d="M14 11a5 5 0 0 0-7.1 0l-2.8 2.8a5 5 0 0 0 7.1 7.1l1.6-1.6"></path>',
  play: '<circle cx="12" cy="12" r="10"></circle><path d="m10 8 6 4-6 4z"></path>',
  note: '<path d="M4 3h11l5 5v13H4z"></path><path d="M14 3v6h6"></path><path d="M8 13h8"></path><path d="M8 17h6"></path>',
  book: '<path d="M2 3h6a4 4 0 0 1 4 4v14a3 3 0 0 0-3-3H2z"></path><path d="M22 3h-6a4 4 0 0 0-4 4v14a3 3 0 0 1 3-3h7z"></path>',
  code: '<path d="m16 18 6-6-6-6"></path><path d="m8 6-6 6 6 6"></path>',
  mail: '<rect x="3" y="5" width="18" height="14" rx="2"></rect><path d="m3 7 9 6 9-6"></path>',
  calendar: '<rect x="3" y="4" width="18" height="18" rx="2"></rect><path d="M16 2v4"></path><path d="M8 2v4"></path><path d="M3 10h18"></path>',
  image: '<rect x="3" y="3" width="18" height="18" rx="2"></rect><circle cx="8.5" cy="8.5" r="1.5"></circle><path d="m21 15-5-5L5 21"></path>',
  tool: '<path d="M14.7 6.3a4 4 0 0 0-5 5L3 18v3h3l6.7-6.7a4 4 0 0 0 5-5l-2.8 2.8-2-2z"></path>'
};

const iconLabels = {
  star: 'Stern',
  link: 'Link',
  play: 'Video',
  note: 'Notiz',
  book: 'Buch',
  code: 'Code',
  mail: 'Mail',
  calendar: 'Kalender',
  image: 'Bild',
  tool: 'Tool'
};

const loginButton = document.querySelector('#favoritesLoginButton');
const logoutButton = document.querySelector('#favoritesLogoutButton');
const loginPanel = document.querySelector('#favoritesLoginPanel');
const panel = document.querySelector('#favoritesPanel');
const message = document.querySelector('#favoritesMessage');
const userBox = document.querySelector('#favoritesUser');
const editor = document.querySelector('#favoriteEditor');
const preview = document.querySelector('#favoritePreview');
const addButton = document.querySelector('#addFavoriteButton');
const saveButton = document.querySelector('#saveFavoritesButton');
const reloadButton = document.querySelector('#reloadFavoritesButton');

let favorites = [];

function escapeHtml(value) {
  return String(value || '')
    .replace(/&/g, '&amp;')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;')
    .replace(/'/g, '&#039;');
}

function createDefaultFavorite() {
  return {
    id: crypto.randomUUID(),
    name: 'Neuer Link',
    url: 'https://',
    group: 'Favoriten',
    description: '',
    color: '#67e8f9',
    icon: 'star',
    logoUrl: '',
    order: favorites.length
  };
}

function iconOptions(selected) {
  return Object.keys(favoriteIcons).map((icon) => (
    `<option value="${icon}" ${icon === selected ? 'selected' : ''}>${iconLabels[icon]}</option>`
  )).join('');
}

function syncFromInputs() {
  editor.querySelectorAll('.favorite-edit-card').forEach((row) => {
    const favorite = favorites[Number(row.dataset.index)];
    if (!favorite) return;
    row.querySelectorAll('[data-field]').forEach((input) => {
      favorite[input.dataset.field] = input.value;
    });
  });
}

function moveFavorite(index, direction) {
  const next = index + direction;
  if (next < 0 || next >= favorites.length) return;
  syncFromInputs();
  [favorites[index], favorites[next]] = [favorites[next], favorites[index]];
  favorites = favorites.map((favorite, order) => ({ ...favorite, order }));
  render();
}

function removeFavorite(index) {
  syncFromInputs();
  favorites.splice(index, 1);
  favorites = favorites.map((favorite, order) => ({ ...favorite, order }));
  render();
}

function renderPreviewCard(favorite) {
  const color = /^#[0-9a-fA-F]{6}$/.test(favorite.color) ? favorite.color : '#67e8f9';
  const iconSvg = favoriteIcons[favorite.icon] || favoriteIcons.star;
  let host = '';
  try {
    host = new URL(favorite.url).hostname;
  } catch {
    host = 'ungueltige-url';
  }

  return `
    <article class="card favorite-card" style="--accent: ${color};">
      <div class="card-icon favorite-icon" style="--accent: ${color};">
        ${favorite.logoUrl
          ? `<img src="${escapeHtml(favorite.logoUrl)}" alt="" loading="lazy">`
          : `<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">${iconSvg}</svg>`}
      </div>
      <div class="card-content">
        <span class="card-category">${escapeHtml(favorite.group || 'Favorit')}</span>
        <h3>${escapeHtml(favorite.name)}</h3>
        <p>${escapeHtml(favorite.description || 'Eigener Weblink')}</p>
      </div>
      <span class="card-domain">${escapeHtml(host)}</span>
    </article>
  `;
}

function renderPreview() {
  preview.innerHTML = favorites.map(renderPreviewCard).join('') || '<div class="favorites-empty">Die Vorschau erscheint hier.</div>';
}

function render() {
  editor.innerHTML = favorites.map((favorite, index) => `
    <article class="favorite-edit-card" data-index="${index}">
      <div class="favorite-edit-head">
        <strong>${escapeHtml(favorite.name || 'Neuer Link')}</strong>
        <div class="favorite-order-actions">
          <button class="ghost-button mini" data-action="up" type="button" ${index === 0 ? 'disabled' : ''}>Hoch</button>
          <button class="ghost-button mini" data-action="down" type="button" ${index === favorites.length - 1 ? 'disabled' : ''}>Runter</button>
          <button class="ghost-button mini danger-button" data-action="remove" type="button">Entfernen</button>
        </div>
      </div>
      <div class="favorite-form-grid">
        <label>Beschriftung<input data-field="name" value="${escapeHtml(favorite.name)}" placeholder="YouTube"></label>
        <label>Link<input data-field="url" value="${escapeHtml(favorite.url)}" placeholder="https://youtube.com"></label>
        <label>Gruppe<input data-field="group" value="${escapeHtml(favorite.group)}" placeholder="Privat"></label>
        <label>Beschreibung<input data-field="description" value="${escapeHtml(favorite.description)}" placeholder="Optionaler Untertitel"></label>
        <label>Farbe<input data-field="color" type="color" value="${escapeHtml(favorite.color || '#67e8f9')}"></label>
        <label>Icon<select data-field="icon">${iconOptions(favorite.icon || 'star')}</select></label>
        <label class="favorite-form-wide">Logo URL<input data-field="logoUrl" value="${escapeHtml(favorite.logoUrl)}" placeholder="https://.../logo.png"></label>
      </div>
    </article>
  `).join('') || '<div class="favorites-empty">Noch keine Favoriten angelegt.</div>';

  renderPreview();

  editor.querySelectorAll('[data-field]').forEach((input) => {
    input.addEventListener('input', () => {
      syncFromInputs();
      renderPreview();
    });
  });

  editor.querySelectorAll('[data-action]').forEach((button) => {
    button.addEventListener('click', () => {
      const index = Number(button.closest('.favorite-edit-card').dataset.index);
      if (button.dataset.action === 'up') moveFavorite(index, -1);
      if (button.dataset.action === 'down') moveFavorite(index, 1);
      if (button.dataset.action === 'remove') removeFavorite(index);
    });
  });
}

async function loadFavorites() {
  const response = await fetch('/api/favorites', {
    cache: 'no-store',
    headers: MischLabsAuth.authHeader()
  });
  const payload = await response.json().catch(() => ({}));
  if (!response.ok) throw new Error(payload.error || `HTTP ${response.status}`);
  favorites = Array.isArray(payload.favorites) ? payload.favorites : [];
  userBox.textContent = `Angemeldet als ${payload.user?.name || MischLabsAuth.displayName()}`;
  render();
}

async function saveFavorites() {
  syncFromInputs();
  const response = await fetch('/api/favorites', {
    method: 'PUT',
    headers: {
      'Content-Type': 'application/json',
      ...MischLabsAuth.authHeader()
    },
    body: JSON.stringify({ favorites })
  });
  const payload = await response.json().catch(() => ({}));
  if (!response.ok) throw new Error(payload.error || `HTTP ${response.status}`);
  favorites = payload.favorites || [];
  render();
  userBox.textContent = 'Favoriten gespeichert.';
}

function updateAuthUi() {
  const authenticated = MischLabsAuth.isAuthenticated();
  loginButton.hidden = authenticated;
  logoutButton.hidden = !authenticated;
  loginPanel.hidden = authenticated;
  panel.hidden = !authenticated;
}

async function boot() {
  try {
    await MischLabsAuth.handleCallback();
  } catch (error) {
    message.textContent = error.message;
  }

  updateAuthUi();
  if (MischLabsAuth.isAuthenticated()) {
    await loadFavorites();
  }
}

loginButton.addEventListener('click', () => MischLabsAuth.login());
logoutButton.addEventListener('click', () => MischLabsAuth.logout());
addButton.addEventListener('click', () => {
  syncFromInputs();
  favorites.push(createDefaultFavorite());
  render();
});
saveButton.addEventListener('click', () => {
  saveFavorites().catch((error) => {
    userBox.textContent = `Speichern fehlgeschlagen: ${error.message}`;
  });
});
reloadButton.addEventListener('click', () => {
  loadFavorites().catch((error) => {
    userBox.textContent = `Laden fehlgeschlagen: ${error.message}`;
  });
});

boot().catch((error) => {
  message.textContent = `Favoritenseite konnte nicht starten: ${error.message}`;
});