/* =========================================================
   WATCHLIST — app.js
   ========================================================= */

/* ── State ── */
const state = {
  filter:  'all',
  type:    '',
  service: '',
  search:  '',
  items:   [],
  stats:   { total: 0, watched: 0, unwatched: 0 },
  services: [],
};

/* ── DOM refs ── */
const grid            = document.getElementById('grid');
const loadingState    = document.getElementById('loadingState');
const statTotal       = document.getElementById('statTotal');
const statUnwatched   = document.getElementById('statUnwatched');
const statWatched     = document.getElementById('statWatched');
const progressFill    = document.getElementById('progressFill');
const statPercent     = document.getElementById('statPercent');
const serviceRow      = document.getElementById('serviceRow');
const searchInput     = document.getElementById('searchInput');

// Modal – Add/Edit
const modalOverlay    = document.getElementById('modalOverlay');
const modal           = document.getElementById('modal');
const modalTitle      = document.getElementById('modalTitle');
const openAddModal    = document.getElementById('openAddModal');
const openAddModalEmpty = document.getElementById('openAddModalEmpty');
const closeModal      = document.getElementById('closeModal');
const cancelModal     = document.getElementById('cancelModal');
const addForm         = document.getElementById('addForm');
const editId          = document.getElementById('editId');
const inputTitle      = document.getElementById('inputTitle');
const inputService    = document.getElementById('inputService');
const inputGenre      = document.getElementById('inputGenre');
const inputNotes      = document.getElementById('inputNotes');
const submitBtn       = document.getElementById('submitBtn');
const serviceList     = document.getElementById('serviceList');

// Modal – Delete
const deleteOverlay   = document.getElementById('deleteOverlay');
const closeDeleteModal = document.getElementById('closeDeleteModal');
const cancelDelete    = document.getElementById('cancelDelete');
const confirmDelete   = document.getElementById('confirmDelete');
const deleteTitle     = document.getElementById('deleteTitle');

// Filter pills
const filterGroup     = document.getElementById('filterGroup');
const typeGroup       = document.getElementById('typeGroup');

// Toast
const toastContainer  = document.getElementById('toastContainer');

/* ── Type toggle state ── */
let selectedType = 'movie';

/* ── API helper ── */
async function api(params = {}, body = null) {
  const url = new URL('api.php', location.href);
  Object.entries(params).forEach(([k, v]) => url.searchParams.set(k, v));

  const opts = body
    ? { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(body) }
    : { method: 'GET' };

  const res = await fetch(url, opts);
  return res.json();
}

/* ── Fetch & render ── */
async function loadItems() {
  showLoading(true);

  try {
    const data = await api({
      action:  'list',
      filter:  state.filter,
      type:    state.type,
      service: state.service,
      search:  state.search,
    });

    if (!data.success) throw new Error(data.error || 'Unknown error');

    state.items    = data.items    || [];
    state.stats    = data.stats    || { total: 0, watched: 0, unwatched: 0 };
    state.services = data.services || [];

    renderStats();
    renderServiceRow();
    renderGrid();
    populateServiceDatalist();

  } catch (err) {
    console.error(err);
    toast('Failed to load watchlist', 'error');
  } finally {
    showLoading(false);
  }
}

function showLoading(on) {
  loadingState.style.display = on ? 'flex' : 'none';
}

/* ── Render Stats ── */
function renderStats() {
  const { total, watched, unwatched } = state.stats;
  const t = parseInt(total)    || 0;
  const w = parseInt(watched)  || 0;
  const u = parseInt(unwatched)|| 0;

  statTotal.textContent     = t;
  statWatched.textContent   = w;
  statUnwatched.textContent = u;

  const pct = t > 0 ? Math.round((w / t) * 100) : 0;
  progressFill.style.width = pct + '%';
  statPercent.textContent  = pct + '% complete';
}

/* ── Render Service Row ── */
function renderServiceRow() {
  serviceRow.innerHTML = '';

  if (!state.services.length) return;

  // "All" chip
  const all = chip('All Services', '', state.service === '');
  serviceRow.appendChild(all);

  state.services.forEach(({ streaming_service }) => {
    const c = chip(streaming_service, streaming_service, state.service === streaming_service);
    serviceRow.appendChild(c);
  });
}

function chip(label, value, active) {
  const btn = document.createElement('button');
  btn.className = 'service-chip' + (active ? ' active' : '');
  btn.textContent = label;
  btn.addEventListener('click', () => {
    state.service = value;
    loadItems();
  });
  return btn;
}

/* ── Populate datalist for service input ── */
function populateServiceDatalist() {
  if (!serviceList) return;
  serviceList.innerHTML = '';
  state.services.forEach(({ streaming_service }) => {
    const opt = document.createElement('option');
    opt.value = streaming_service;
    serviceList.appendChild(opt);
  });
}

/* ── Render Grid ── */
function renderGrid() {
  // Remove old cards (keep loading div)
  Array.from(grid.children).forEach(el => {
    if (!el.id || el.id !== 'loadingState') el.remove();
  });

  const emptyEl = document.getElementById('emptyState');
  if (emptyEl) emptyEl.remove();

  if (!state.items.length) {
    renderEmpty();
    return;
  }

  state.items.forEach(item => {
    grid.appendChild(buildCard(item));
  });
}

function renderEmpty() {
  const div = document.createElement('div');
  div.className = 'empty-state';
  div.id = 'emptyState';
  div.innerHTML = `
    <div class="empty-icon">🎬</div>
    <h2 class="empty-title">Nothing here yet</h2>
    <p class="empty-sub">Add your first movie or show to get started.</p>
    <button class="btn-primary" id="openAddModalEmpty">
      <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round"><line x1="12" y1="5" x2="12" y2="19"/><line x1="5" y1="12" x2="19" y2="12"/></svg>
      Add Title
    </button>
  `;
  grid.appendChild(div);
  div.querySelector('#openAddModalEmpty').addEventListener('click', openAdd);
}

/* ── Build Card ── */
function buildCard(item) {
  const watched = item.watched == 1;
  const isMovie = item.type === 'movie';

  const card = document.createElement('div');
  card.className = 'card' + (watched ? ' watched' : '');
  card.dataset.id = item.id;

  // Format date
  const dateStr = item.watched_at
    ? 'Watched ' + formatDate(item.watched_at)
    : 'Added ' + formatDate(item.created_at);

  card.innerHTML = `
    <div class="card-accent"></div>
    <div class="card-body">
      <div class="card-meta">
        <span class="badge ${isMovie ? 'badge-movie' : 'badge-show'}">
          ${isMovie ? '🎬 Movie' : '📺 Show'}
        </span>
        ${item.streaming_service ? `<span class="badge badge-service">${escHtml(item.streaming_service)}</span>` : ''}
        ${item.genre ? `<span class="badge badge-genre">${escHtml(item.genre)}</span>` : ''}
      </div>
      <h3 class="card-title">${escHtml(item.title)}</h3>
      ${item.notes ? `<p class="card-notes">${escHtml(item.notes)}</p>` : ''}
      <p class="card-date">${dateStr}</p>
    </div>
    <div class="card-footer">
      <button class="btn-watch" data-id="${item.id}" data-watched="${watched ? 1 : 0}">
        ${watched
          ? `<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="20 6 9 17 4 12"/></svg> Watched`
          : `<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/></svg> Mark Watched`}
      </button>
      <div class="card-actions">
        <button class="btn-icon btn-edit" data-id="${item.id}" title="Edit">
          <svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7"/><path d="M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z"/></svg>
        </button>
        <button class="btn-icon btn-delete" data-id="${item.id}" data-title="${escAttr(item.title)}" title="Remove">
          <svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="3 6 5 6 21 6"/><path d="M19 6l-1 14H6L5 6"/><path d="M10 11v6"/><path d="M14 11v6"/><path d="M9 6V4h6v2"/></svg>
        </button>
      </div>
    </div>
  `;

  // Events
  card.querySelector('.btn-watch').addEventListener('click', () => toggleWatched(item.id));
  card.querySelector('.btn-edit').addEventListener('click', () => openEdit(item));
  card.querySelector('.btn-delete').addEventListener('click', () => openDeleteConfirm(item.id, item.title));

  return card;
}

/* ── Toggle watched ── */
async function toggleWatched(id) {
  try {
    const data = await api({}, { action: 'toggle', id });
    if (!data.success) throw new Error(data.error);
    toast(data.item.watched ? '✓ Marked as watched' : 'Moved back to watchlist', 'success');
    loadItems();
  } catch (err) {
    toast('Could not update item', 'error');
  }
}

/* ── Add Modal ── */
function openAdd() {
  editId.value     = '';
  addForm.reset();
  selectedType     = 'movie';
  updateTypeToggle();
  modalTitle.textContent  = 'Add Title';
  submitBtn.textContent   = 'Add to Watchlist';
  showModal(true);
  setTimeout(() => inputTitle.focus(), 50);
}

function openEdit(item) {
  editId.value          = item.id;
  inputTitle.value      = item.title;
  inputService.value    = item.streaming_service || '';
  inputGenre.value      = item.genre || '';
  inputNotes.value      = item.notes || '';
  selectedType          = item.type || 'movie';
  updateTypeToggle();
  modalTitle.textContent = 'Edit Title';
  submitBtn.textContent  = 'Save Changes';
  showModal(true);
  setTimeout(() => inputTitle.focus(), 50);
}

function showModal(on) {
  modalOverlay.classList.toggle('hidden', !on);
  document.body.style.overflow = on ? 'hidden' : '';
}

/* ── Type toggle inside form ── */
function updateTypeToggle() {
  document.querySelectorAll('.type-option').forEach(btn => {
    btn.classList.toggle('active', btn.dataset.typeVal === selectedType);
  });
}

document.querySelectorAll('.type-option').forEach(btn => {
  btn.addEventListener('click', () => {
    selectedType = btn.dataset.typeVal;
    updateTypeToggle();
  });
});

/* ── Form submit ── */
addForm.addEventListener('submit', async (e) => {
  e.preventDefault();

  const title = inputTitle.value.trim();
  if (!title) {
    inputTitle.focus();
    inputTitle.style.borderColor = 'var(--danger)';
    setTimeout(() => inputTitle.style.borderColor = '', 1200);
    return;
  }

  submitBtn.disabled   = true;
  submitBtn.textContent = editId.value ? 'Saving…' : 'Adding…';

  try {
    const payload = {
      action:            editId.value ? 'edit' : 'add',
      id:                editId.value ? parseInt(editId.value) : undefined,
      title,
      type:              selectedType,
      streaming_service: inputService.value.trim(),
      genre:             inputGenre.value.trim(),
      notes:             inputNotes.value.trim(),
    };

    const data = await api({}, payload);
    if (!data.success) throw new Error(data.error);

    toast(editId.value ? '✓ Changes saved' : '✓ Added to watchlist', 'success');
    showModal(false);
    loadItems();

  } catch (err) {
    toast(err.message || 'Something went wrong', 'error');
  } finally {
    submitBtn.disabled    = false;
    submitBtn.textContent = editId.value ? 'Save Changes' : 'Add to Watchlist';
  }
});

/* ── Delete ── */
let pendingDeleteId = null;

function openDeleteConfirm(id, title) {
  pendingDeleteId = id;
  deleteTitle.textContent = title;
  deleteOverlay.classList.remove('hidden');
  document.body.style.overflow = 'hidden';
}

function closeDelete() {
  pendingDeleteId = null;
  deleteOverlay.classList.add('hidden');
  document.body.style.overflow = '';
}

confirmDelete.addEventListener('click', async () => {
  if (!pendingDeleteId) return;
  confirmDelete.disabled = true;

  try {
    const data = await api({}, { action: 'delete', id: pendingDeleteId });
    if (!data.success) throw new Error(data.error);
    toast('Removed from watchlist', 'success');
    closeDelete();
    loadItems();
  } catch (err) {
    toast('Could not remove item', 'error');
  } finally {
    confirmDelete.disabled = false;
  }
});

/* ── Filter pills ── */
filterGroup.addEventListener('click', (e) => {
  const btn = e.target.closest('.pill');
  if (!btn) return;
  filterGroup.querySelectorAll('.pill').forEach(b => b.classList.remove('active'));
  btn.classList.add('active');
  state.filter = btn.dataset.filter;
  loadItems();
});

typeGroup.addEventListener('click', (e) => {
  const btn = e.target.closest('.type-pill');
  if (!btn) return;
  typeGroup.querySelectorAll('.type-pill').forEach(b => b.classList.remove('active'));
  btn.classList.add('active');
  state.type = btn.dataset.type;
  loadItems();
});

/* ── Search (debounced) ── */
let searchTimer;
searchInput.addEventListener('input', () => {
  clearTimeout(searchTimer);
  searchTimer = setTimeout(() => {
    state.search = searchInput.value.trim();
    loadItems();
  }, 320);
});

/* ── Modal close handlers ── */
openAddModal.addEventListener('click', openAdd);
closeModal.addEventListener('click', () => showModal(false));
cancelModal.addEventListener('click', () => showModal(false));
closeDeleteModal.addEventListener('click', closeDelete);
cancelDelete.addEventListener('click', closeDelete);

// Close on overlay click
modalOverlay.addEventListener('click', (e) => { if (e.target === modalOverlay) showModal(false); });
deleteOverlay.addEventListener('click', (e) => { if (e.target === deleteOverlay) closeDelete(); });

// Keyboard
document.addEventListener('keydown', (e) => {
  if (e.key === 'Escape') {
    if (!modalOverlay.classList.contains('hidden'))  showModal(false);
    if (!deleteOverlay.classList.contains('hidden')) closeDelete();
  }
});

/* ── Toast ── */
function toast(msg, type = 'default') {
  const el = document.createElement('div');
  el.className = 'toast' + (type === 'success' ? ' toast-success' : type === 'error' ? ' toast-error' : '');

  const icon = type === 'success' ? '✓' : type === 'error' ? '✕' : 'ℹ';
  el.innerHTML = `<span class="toast-icon">${icon}</span><span>${escHtml(msg)}</span>`;
  toastContainer.appendChild(el);

  setTimeout(() => {
    el.style.animation = 'toastOut 280ms ease forwards';
    setTimeout(() => el.remove(), 280);
  }, 3000);
}

/* ── Helpers ── */
function escHtml(str) {
  return String(str)
    .replace(/&/g, '&amp;')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;')
    .replace(/'/g, '&#39;');
}

function escAttr(str) {
  return String(str).replace(/"/g, '&quot;').replace(/'/g, '&#39;');
}

function formatDate(dateStr) {
  if (!dateStr) return '';
  const d = new Date(dateStr);
  if (isNaN(d)) return '';
  return d.toLocaleDateString('en-US', { month: 'short', day: 'numeric', year: 'numeric' });
}

/* ── Init ── */
loadItems();