/* ── State ──────────────────────────────────────────────── */
let currentPage = 1;
let currentFilter = 'all';
let currentSort = 'watched_at';
let totalPages = 1;
let totalCount = 0;
let showSkipped = false;

/* Rating value → color (index 0 unused) */
const COLORS = [
  null,
  '#f43f5e', '#f43f5e',  // 1-2
  '#fb7185',              // 3
  '#fb923c',              // 4
  '#f59e0b',              // 5
  '#eab308',              // 6
  '#84cc16',              // 7
  '#22c55e',              // 8
  '#10b981',              // 9
  '#06b6d4',              // 10
];

/* ── Skipped (localStorage) ─────────────────────────────── */
function getSkipped() {
  try { return new Set(JSON.parse(localStorage.getItem('skipped') || '[]')); }
  catch { return new Set(); }
}

function saveSkipped(set) {
  localStorage.setItem('skipped', JSON.stringify([...set]));
  document.getElementById('skipped-count').textContent = set.size;
}

function skipMovie(traktId) {
  const s = getSkipped();
  s.add(traktId);
  saveSkipped(s);
}

function unskipMovie(traktId) {
  const s = getSkipped();
  s.delete(traktId);
  saveSkipped(s);
}

function toggleSkipped() {
  showSkipped = !showSkipped;
  const btn = document.getElementById('skipped-toggle');
  btn.style.color = showSkipped ? 'var(--accent)' : '';
  btn.style.borderColor = showSkipped ? 'var(--accent)' : '';
  currentPage = 1;
  loadMovies();
}

/* ── Boot ───────────────────────────────────────────────── */
async function init() {
  const { authenticated } = await fetch('/api/auth/status').then(r => r.json());
  if (!authenticated) {
    show('login-screen');
  } else {
    show('app');
    document.getElementById('skipped-count').textContent = getSkipped().size;
    document.getElementById('filter-select').addEventListener('change', e => {
      currentFilter = e.target.value;
      currentPage = 1;
      loadMovies();
    });
    document.getElementById('sort-select').addEventListener('change', e => {
      currentSort = e.target.value;
      currentPage = 1;
      loadMovies();
    });
    loadMovies();
  }
}

function show(id) { document.getElementById(id).classList.remove('hidden'); }
function hide(id) { document.getElementById(id).classList.add('hidden'); }

/* ── Load page ──────────────────────────────────────────── */
async function loadMovies() {
  const list = document.getElementById('movie-list');
  list.innerHTML = '';
  hide('empty');
  document.getElementById('pagination').innerHTML = '';
  show('loading');

  try {
    const skipped = getSkipped();
    const params = new URLSearchParams({
      page: currentPage,
      per_page: 20,
      sort: currentSort,
      filter_type: currentFilter,
      exclude: showSkipped ? '' : [...skipped].join(','),
    });
    const data = await fetch(`/api/movies?${params}`).then(r => r.json());
    hide('loading');

    // In "skipped" view, filter client-side to only show skipped ones
    const movies = showSkipped
      ? data.movies.filter(m => skipped.has(m.trakt_id))
      : data.movies;

    totalPages = data.total_pages;

    document.getElementById('count-badge').textContent =
      `${data.total} film${data.total !== 1 ? 's' : ''}`;

    if (!movies.length) {
      show('empty');
      document.getElementById('empty').querySelector('p').textContent =
        showSkipped ? 'Aucun film passé.' : 'Tous les films sont notés !';
      return;
    }

    movies.forEach(m => list.appendChild(buildRow(m)));
    renderPagination();
  } catch (err) {
    hide('loading');
    console.error(err);
    showToast('Erreur de chargement', true);
  }
}

/* ── Build movie row ────────────────────────────────────── */
function buildRow(movie) {
  const skipped = getSkipped();
  const isSkipped = skipped.has(movie.trakt_id);

  const row = document.createElement('div');
  row.className = 'movie-row' + (isSkipped ? ' is-skipped' : '');
  row.dataset.id = movie.trakt_id;

  // Poster
  const poster = movie.poster
    ? `<img class="movie-poster" src="${movie.poster}" alt="" loading="lazy">`
    : `<div class="poster-ph">🎬</div>`;

  // Info
  const meta = [movie.year, fmtDate(movie.watched_at)].filter(Boolean).join(' · ');
  const badge = movie.current_rating === 10
    ? `<span class="badge-10">★ noté 10/10</span>` : '';

  const info = `
    <div class="movie-info">
      <div class="movie-title">${esc(movie.title_fr)}</div>
      <div class="movie-meta">${esc(meta)}</div>
      ${badge}
    </div>`;

  // Synopsis
  const synopsis = movie.overview
    ? `<div class="movie-synopsis"><div class="synopsis-text">${esc(movie.overview)}</div></div>`
    : `<div class="movie-synopsis"><span class="synopsis-empty">Aucun résumé disponible</span></div>`;

  // Rating buttons + skip button
  const btns = Array.from({ length: 10 }, (_, i) =>
    `<button class="r-btn" data-n="${i + 1}">${i + 1}</button>`
  ).join('');

  const skipLabel = isSkipped ? 'Remettre' : 'Passer';
  const skipBtn = `<button class="skip-btn">${skipLabel}</button>`;
  const removeBtn = movie.current_rating !== null
    ? `<button class="remove-btn" title="Supprimer la note">✕</button>` : '';

  const ratingEl = `<div class="movie-rating">${btns}${removeBtn}${skipBtn}</div>`;

  row.innerHTML = poster + info + synopsis + ratingEl;

  // Rating hover & click
  const container = row.querySelector('.movie-rating');
  const buttons = [...container.querySelectorAll('.r-btn')];

  buttons.forEach((btn, idx) => {
    btn.addEventListener('mouseenter', () => {
      buttons.forEach((b, i) => {
        if (i <= idx) {
          const c = COLORS[i + 1];
          b.style.background = c + '28';
          b.style.borderColor = c;
          b.style.color = c;
        } else {
          b.style.background = '';
          b.style.borderColor = '';
          b.style.color = '';
        }
      });
    });
    btn.addEventListener('click', () => rateMovie(movie, parseInt(btn.dataset.n), row));
  });

  container.addEventListener('mouseleave', () => {
    buttons.forEach(b => {
      b.style.background = '';
      b.style.borderColor = '';
      b.style.color = '';
    });
  });

  // Remove rating button
  const removeBtnEl = container.querySelector('.remove-btn');
  if (removeBtnEl) {
    removeBtnEl.addEventListener('click', () => removeRating(movie, row));
  }

  // Skip button
  container.querySelector('.skip-btn').addEventListener('click', () => {
    if (isSkipped) {
      unskipMovie(movie.trakt_id);
      showToast(`${movie.title_fr} — remis dans la liste`);
    } else {
      skipMovie(movie.trakt_id);
      showToast(`${movie.title_fr} — passé`);
    }
    animateOut(row);
  });

  return row;
}

/* ── Remove rating ──────────────────────────────────────── */
async function removeRating(movie, row) {
  row.style.pointerEvents = 'none';
  try {
    const r = await fetch(`/api/rate/${movie.trakt_id}`, { method: 'DELETE' });
    if (!r.ok) throw new Error('Failed');
    showToast(`${movie.title_fr} — note supprimée`);
    animateOut(row);
  } catch {
    row.style.pointerEvents = '';
    showToast('Erreur lors de la suppression', true);
  }
}

/* ── Rate ───────────────────────────────────────────────── */
async function rateMovie(movie, rating, row) {
  row.style.pointerEvents = 'none';
  try {
    const r = await fetch(`/api/rate/${movie.trakt_id}`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ rating }),
    });
    if (!r.ok) throw new Error('Failed');

    showToast(`${movie.title_fr} — noté ${rating}/10`);
    animateOut(row);
  } catch {
    row.style.pointerEvents = '';
    showToast('Erreur lors de la notation', true);
  }
}

/* ── Animate row out ────────────────────────────────────── */
function animateOut(row) {
  row.style.transition = 'opacity .28s ease, transform .28s ease';
  row.style.opacity = '0';
  row.style.transform = 'translateX(16px)';

  setTimeout(() => {
    const h = row.offsetHeight;
    row.style.height = h + 'px';
    row.style.overflow = 'hidden';
    row.style.transition = 'height .22s ease, padding .22s ease, margin .22s ease, border-width .22s ease';
    requestAnimationFrame(() => {
      row.style.height = '0';
      row.style.paddingTop = '0';
      row.style.paddingBottom = '0';
      row.style.marginBottom = '0';
      row.style.borderWidth = '0';
    });
    setTimeout(() => {
      row.remove();
      if (!document.querySelectorAll('.movie-row').length) {
        if (currentPage > 1) currentPage--;
        loadMovies();
      }
    }, 240);
  }, 280);
}

/* ── Pagination ─────────────────────────────────────────── */
function renderPagination() {
  if (totalPages <= 1) return;
  const el = document.getElementById('pagination');

  const prev = mkBtn('← Précédent', currentPage === 1, () => { currentPage--; reload(); });
  const info = document.createElement('span');
  info.className = 'page-info';
  info.textContent = `Page ${currentPage} / ${totalPages}`;
  const next = mkBtn('Suivant →', currentPage === totalPages, () => { currentPage++; reload(); });

  el.append(prev, info, next);
}

function mkBtn(label, disabled, onClick) {
  const b = document.createElement('button');
  b.className = 'page-btn';
  b.textContent = label;
  b.disabled = disabled;
  b.addEventListener('click', onClick);
  return b;
}

function reload() {
  window.scrollTo({ top: 0, behavior: 'smooth' });
  loadMovies();
}

/* ── Toast ──────────────────────────────────────────────── */
let toastTimer;
function showToast(msg, isError = false) {
  const t = document.getElementById('toast');
  t.textContent = msg;
  t.style.borderColor = isError ? 'rgba(244,63,94,.35)' : '';
  t.style.color = isError ? '#f87191' : '';
  t.classList.add('show');
  clearTimeout(toastTimer);
  toastTimer = setTimeout(() => t.classList.remove('show'), 2800);
}

/* ── Utils ──────────────────────────────────────────────── */
function fmtDate(iso) {
  if (!iso) return '';
  return new Date(iso).toLocaleDateString('fr-FR', {
    day: 'numeric', month: 'short', year: 'numeric',
  });
}

function esc(str) {
  const d = document.createElement('div');
  d.appendChild(document.createTextNode(str ?? ''));
  return d.innerHTML;
}

init();