/* Panel de administración: login, rondas, Excel. */
(() => {
  const $ = (id) => document.getElementById(id);

  const toast = (msg, isError = false) => {
    const el = $('toast');
    el.textContent = msg;
    el.classList.toggle('error', isError);
    el.classList.add('show');
    clearTimeout(el._t);
    el._t = setTimeout(() => el.classList.remove('show'), 2600);
  };

  const fetchJSON = async (url, opts) => {
    const res = await fetch(url, opts && {
      method: opts.method,
      headers: opts.body ? { 'Content-Type': 'application/json' } : undefined,
      body: opts.body ? JSON.stringify(opts.body) : undefined,
    });
    const data = await res.json().catch(() => ({}));
    if (!res.ok) throw new Error(data.error || 'Error de conexión');
    return data;
  };

  function show(view) {
    $('login-card').classList.toggle('hidden', view !== 'login');
    $('panel').classList.toggle('hidden', view !== 'panel');
  }

  // ---------- login ----------

  $('login-form').addEventListener('submit', async (e) => {
    e.preventDefault();
    const err = $('login-error');
    err.classList.remove('show');
    try {
      await fetchJSON('/api/admin/login', { method: 'POST', body: { password: $('password').value } });
      $('password').value = '';
      show('panel');
      loadRounds();
    } catch (ex) {
      err.textContent = ex.message;
      err.classList.add('show');
    }
  });

  $('logout-btn').addEventListener('click', async () => {
    await fetchJSON('/api/admin/logout', { method: 'POST' }).catch(() => {});
    show('login');
  });

  // ---------- rondas ----------

  $('round-year').value = new Date().getFullYear() + 1;

  $('create-form').addEventListener('submit', async (e) => {
    e.preventDefault();
    const err = $('create-error');
    err.classList.remove('show');
    try {
      const roles = $('round-roles').value.split(',').map((s) => s.trim()).filter(Boolean);
      const { round } = await fetchJSON('/api/admin/rounds', {
        method: 'POST',
        body: { name: $('round-name').value, year: Number($('round-year').value), roles },
      });
      $('round-name').value = '';
      await copyUrl(round.token, false);
      toast('✓ Ronda creada y URL copiada');
      loadRounds();
    } catch (ex) {
      err.textContent = ex.message;
      err.classList.add('show');
    }
  });

  const roundUrl = (token) => `${location.origin}/r/${token}`;

  async function copyUrl(token, notify = true) {
    try {
      await navigator.clipboard.writeText(roundUrl(token));
      if (notify) toast('✓ URL copiada al portapapeles');
    } catch {
      if (notify) toast('No se pudo copiar; mantén pulsado el enlace', true);
    }
  }

  async function loadRounds() {
    const list = $('rounds-list');
    let rounds;
    try {
      ({ rounds } = await fetchJSON('/api/admin/rounds'));
    } catch {
      show('login');
      return;
    }
    list.innerHTML = '';
    if (!rounds.length) {
      list.innerHTML = '<p class="empty">Todavía no hay rondas. Crea la primera arriba.</p>';
      return;
    }
    for (const r of rounds) {
      const open = r.status === 'open';
      const item = document.createElement('div');
      item.className = 'round-item';
      item.innerHTML = `
        <div class="info">
          <span class="title">${esc(r.name)} ${r.year}</span>
          <span class="badge ${open ? 'open' : 'closed'}">${open ? 'Abierta' : 'Cerrada'}</span>
          <div class="meta">${r.workers} persona${r.workers === 1 ? '' : 's'} · ${r.days} día${r.days === 1 ? '' : 's'} pedidos</div>
          <a class="url" href="/r/${r.token}" target="_blank" rel="noopener">${roundUrl(r.token)}</a>
        </div>
        <div class="actions">
          <button class="btn btn--ghost btn--small" data-act="copy">Copiar URL</button>
          <a class="btn btn--ghost btn--small" href="/api/admin/rounds/${r.id}/excel" download>Excel</a>
          <button class="btn btn--small ${open ? 'btn--accent' : ''}" data-act="status">
            ${open ? 'Cerrar ronda' : 'Reabrir'}
          </button>
        </div>`;
      item.querySelector('[data-act=copy]').addEventListener('click', () => copyUrl(r.token));
      item.querySelector('[data-act=status]').addEventListener('click', async () => {
        if (open && !confirm(`¿Cerrar la ronda "${r.name} ${r.year}"? Nadie podrá pedir ni modificar días.`)) return;
        try {
          await fetchJSON(`/api/admin/rounds/${r.id}/status`, {
            method: 'POST',
            body: { status: open ? 'closed' : 'open' },
          });
          toast(open ? 'Ronda cerrada' : 'Ronda reabierta');
          loadRounds();
        } catch (ex) {
          toast(ex.message, true);
        }
      });
      list.appendChild(item);
    }
  }

  const esc = (s) =>
    s.replace(/[&<>"']/g, (c) => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[c]));

  // ---------- arranque ----------

  fetchJSON('/api/admin/me')
    .then(() => { show('panel'); loadRounds(); })
    .catch(() => show('login'));
})();