/* Panel de administración: login, rondas, calendario de aprobación, Excel. */
(() => {
  const $ = (id) => document.getElementById(id);
  const MONTHS = ['Enero','Febrero','Marzo','Abril','Mayo','Junio','Julio','Agosto','Septiembre','Octubre','Noviembre','Diciembre'];
  const DOW = ['L','M','X','J','V','S','D'];

  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;
  };

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

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

  // Alterna entre la lista de rondas y la vista de calendario dentro del panel.
  function showPanelView(which) {
    $('rounds-view').classList.toggle('hidden', which !== 'rounds');
    $('calendar-view').classList.toggle('hidden', which !== 'calendar');
    document.body.classList.toggle('cal-open', which === 'calendar');
    if (which !== 'calendar') hideActionbar();
  }

  // ---------- 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');
  });

  // ---------- editor de cargos (nueva ronda) ----------

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

  function addRoleRow(label = '', max = '') {
    const row = document.createElement('div');
    row.className = 'role-row';
    row.innerHTML = `
      <input class="role-label" type="text" maxlength="40" placeholder="Cargo (p. ej. Camarero/a)" value="${esc(label)}" />
      <input class="role-max" type="number" min="1" max="99" placeholder="máx/día" value="${esc(max)}" />
      <button type="button" class="role-del" title="Quitar cargo">✕</button>`;
    row.querySelector('.role-del').addEventListener('click', () => {
      if ($('roles-editor').children.length > 1) row.remove();
    });
    $('roles-editor').appendChild(row);
  }
  // Cargos propuestos por defecto al abrir el panel.
  [['Camarero/a', 2], ['Encargado', ''], ['Cocina', 1]].forEach(([l, m]) => addRoleRow(l, m));
  $('add-role').addEventListener('click', () => addRoleRow());

  function readRoles() {
    return [...$('roles-editor').querySelectorAll('.role-row')]
      .map((row) => ({
        label: row.querySelector('.role-label').value.trim(),
        max: row.querySelector('.role-max').value,
      }))
      .filter((r) => r.label)
      .map((r) => ({ label: r.label, max: r.max === '' ? null : Number(r.max) }));
  }

  $('create-form').addEventListener('submit', async (e) => {
    e.preventDefault();
    const err = $('create-error');
    err.classList.remove('show');
    try {
      const roles = readRoles();
      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');
    }
  });

  // ---------- lista de rondas ----------

  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 = $('rounds-list');
    let rounds;
    try {
      ({ rounds } = await fetchJSON('/api/admin/rounds'));
    } catch {
      show('login');
      return;
    }
    showPanelView('rounds');
    list.innerHTML = '';
    if (!rounds.length) {
      list.innerHTML = '<p class="empty">Todavía no hay rondas. Crea la primera arriba.</p>';
      return;
    }
    for (const r of rounds) {
      const open = r.status === 'open';
      const pending = r.pending
        ? ` · <b class="pending-flag">${r.pending} pendiente${r.pending === 1 ? '' : 's'}</b>`
        : '';
      const item = document.createElement('div');
      item.className = 'round-item';
      item.innerHTML = `
        <div class="info">
          <span class="title">${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${pending}</div>
          <a class="url" href="/r/${r.token}" target="_blank" rel="noopener">${roundUrl(r.token)}</a>
        </div>
        <div class="actions">
          <button class="btn btn--small btn--accent" data-act="calendar">Calendario</button>
          <button class="btn btn--ghost btn--small" data-act="copy">Copiar URL</button>
          <a class="btn btn--ghost btn--small" href="/api/admin/rounds/${r.id}/excel" download>Excel</a>
          <button class="btn btn--small ${open ? '' : 'btn--ghost'}" data-act="status">
            ${open ? 'Cerrar' : 'Reabrir'}
          </button>
          <button class="btn btn--ghost btn--small" data-act="delete" title="Eliminar ronda">🗑</button>
        </div>`;
      item.querySelector('[data-act=calendar]').addEventListener('click', () => openCalendar(r.id));
      item.querySelector('[data-act=copy]').addEventListener('click', () => copyUrl(r.token));
      item.querySelector('[data-act=status]').addEventListener('click', async () => {
        if (open && !confirm(`¿Cerrar la ronda "${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);
        }
      });
      item.querySelector('[data-act=delete]').addEventListener('click', async () => {
        if (!confirm(`¿Eliminar la ronda "${r.name} ${r.year}" y todas sus peticiones? No se puede deshacer.`)) return;
        try {
          await fetchJSON(`/api/admin/rounds/${r.id}`, { method: 'DELETE' });
          toast('Ronda eliminada');
          loadRounds();
        } catch (ex) {
          toast(ex.message, true);
        }
      });
      list.appendChild(item);
    }
  }

  // ===================================================================
  //  Calendario de aprobación
  // ===================================================================

  let cal = null;             // datos de la ronda en curso
  let selectedWorkerId = null;// empleado seleccionado (null = vista de ocupación)
  let focusedDate = null;     // día con la barra de acción abierta

  const iso = (y, m, d) =>
    `${y}-${String(m + 1).padStart(2, '0')}-${String(d).padStart(2, '0')}`;
  const initials = (label) => label.replace(/[^\p{L}\p{N}]/gu, '').slice(0, 2) || '·';

  async function openCalendar(id) {
    try {
      cal = await fetchJSON(`/api/admin/rounds/${id}/calendar`);
    } catch (ex) {
      toast(ex.message, true);
      return;
    }
    selectedWorkerId = null;
    focusedDate = null;
    const open = cal.round.status === 'open';
    $('cal-title').textContent = `${cal.round.name} ${cal.round.year}`;
    $('cal-status').textContent = open ? 'Abierta' : 'Cerrada';
    $('cal-status').className = `badge ${open ? 'open' : 'closed'}`;
    showPanelView('calendar');
    renderLimitsEditor();
    rerender();
    window.scrollTo(0, 0);
  }

  $('cal-back').addEventListener('click', () => loadRounds());

  // ----- editor de límites -----

  function renderLimitsEditor() {
    const box = $('cal-limits-fields');
    box.innerHTML = '';
    for (const [key, label] of Object.entries(cal.roles)) {
      const field = document.createElement('label');
      field.className = 'limit-field';
      field.innerHTML =
        `<span>${esc(label)}</span>` +
        `<input type="number" min="1" max="99" placeholder="∞" data-role="${esc(key)}" value="${cal.limits[key] ?? ''}" />`;
      box.appendChild(field);
    }
  }

  $('cal-limits-save').addEventListener('click', async () => {
    const limits = {};
    $('cal-limits-fields').querySelectorAll('input').forEach((inp) => {
      const v = inp.value.trim();
      if (v !== '') limits[inp.dataset.role] = Number(v);
    });
    try {
      const data = await fetchJSON(`/api/admin/rounds/${cal.round.id}/limits`, { method: 'PUT', body: { limits } });
      cal.limits = data.limits;
      toast('✓ Límites guardados');
      rerender();
    } catch (ex) {
      toast(ex.message, true);
    }
  });

  // ----- datos derivados -----

  // Ocupación por fecha y cargo: {date: {role: {approved, pending, rejected}}}.
  function occupancy() {
    const map = {};
    for (const w of cal.workers) {
      for (const r of w.requests) {
        const cell = (map[r.date] ??= {});
        const c = (cell[w.role] ??= { approved: 0, pending: 0, rejected: 0 });
        c[r.status]++;
      }
    }
    return map;
  }
  const held = (c) => (c ? c.approved + c.pending : 0); // ocupan hueco (no rechazadas)

  function workerById(id) {
    return cal.workers.find((w) => w.id === id) || null;
  }

  // ----- barra lateral -----

  function renderSidebar() {
    const box = $('cal-sidebar');
    box.innerHTML = '';

    const all = document.createElement('button');
    all.type = 'button';
    all.className = 'side-all' + (selectedWorkerId == null ? ' is-active' : '');
    all.textContent = 'Ocupación (todo el equipo)';
    all.addEventListener('click', () => { selectedWorkerId = null; rerender(); });
    box.appendChild(all);

    if (!cal.workers.length) {
      const empty = document.createElement('p');
      empty.className = 'empty';
      empty.textContent = 'Nadie se ha registrado todavía.';
      box.appendChild(empty);
      return;
    }

    let lastRole = null;
    for (const w of cal.workers) {
      if (w.role !== lastRole) {
        lastRole = w.role;
        const h = document.createElement('p');
        h.className = 'side-role';
        const lim = cal.limits[w.role];
        h.innerHTML = `${esc(cal.roles[w.role] || w.role)}${lim ? ` <span class="side-lim">máx ${lim}/día</span>` : ''}`;
        box.appendChild(h);
      }
      const counts = { approved: 0, pending: 0, rejected: 0 };
      for (const r of w.requests) counts[r.status]++;
      const active = w.id === selectedWorkerId;
      const card = document.createElement('div');
      card.className = 'side-worker' + (active ? ' is-active' : '');
      card.innerHTML = `
        <button type="button" class="side-worker-main">
          <span class="name">${esc(w.name)}</span>
          <span class="tags">
            <span class="t t-ap">${counts.approved}✓</span>
            <span class="t t-pe">${counts.pending}⏳</span>
            <span class="t t-re">${counts.rejected}✕</span>
          </span>
        </button>`;
      card.querySelector('.side-worker-main').addEventListener('click', () => {
        selectedWorkerId = active ? null : w.id;
        rerender();
      });
      if (active) {
        const bulk = document.createElement('div');
        bulk.className = 'side-bulk';
        const pend = w.requests.filter((r) => r.status === 'pending').map((r) => r.date);
        bulk.innerHTML = `
          <button class="btn btn--small act-approve" ${pend.length ? '' : 'disabled'}>Aprobar pendientes</button>
          <button class="btn btn--small act-reject" ${pend.length ? '' : 'disabled'}>Rechazar pendientes</button>`;
        const [bApprove, bReject] = bulk.querySelectorAll('button');
        bApprove.addEventListener('click', () => setStatus(w.id, pend, 'approved'));
        bReject.addEventListener('click', () => setStatus(w.id, pend, 'rejected'));
        card.appendChild(bulk);
      }
      box.appendChild(card);
    }
  }

  // ----- calendario -----

  function renderGrid() {
    const occ = occupancy();
    const worker = workerById(selectedWorkerId);
    const myReq = worker ? new Map(worker.requests.map((r) => [r.date, r.status])) : null;

    const hint = document.createElement('p');
    hint.className = 'hint cal-mode-hint';
    hint.innerHTML = worker
      ? `Editando a <b>${esc(worker.name)}</b> · ${esc(cal.roles[worker.role] || worker.role)}. Toca un día para aprobarlo, rechazarlo, dejarlo pendiente o quitarlo.`
      : 'Vista de ocupación de todo el equipo. Elige un empleado en la izquierda para aprobar o editar sus días.';

    const grid = $('cal-grid');
    grid.innerHTML = '';
    grid.appendChild(hint);

    const months = document.createElement('div');
    months.className = 'cal-months';

    for (let m = 0; m < 12; m++) {
      const month = document.createElement('section');
      month.className = 'month';
      month.innerHTML =
        `<h3>${MONTHS[m]} ${cal.round.year}</h3>` +
        `<div class="dow">${DOW.map((d) => `<span>${d}</span>`).join('')}</div>`;
      const days = document.createElement('div');
      days.className = 'days';
      const first = new Date(cal.round.year, m, 1);
      const blanks = (first.getDay() + 6) % 7;
      for (let i = 0; i < blanks; i++) days.appendChild(document.createElement('span'));

      const total = new Date(cal.round.year, m + 1, 0).getDate();
      for (let d = 1; d <= total; d++) {
        const date = iso(cal.round.year, m, d);
        const btn = document.createElement('button');
        btn.type = 'button';
        btn.dataset.date = date;

        if (worker) {
          // Modo empleado: color por su estado + carga del cargo ese día.
          const status = myReq.get(date);
          let cls = 'cday';
          if (status) cls += ' s-' + status;
          if (date === focusedDate) cls += ' focused';
          btn.className = cls;
          btn.innerHTML = `<span class="n">${d}</span>`;
          const others = held(occ[date]?.[worker.role]) - (status && status !== 'rejected' ? 1 : 0);
          const lim = cal.limits[worker.role];
          if (others > 0) {
            const load = document.createElement('span');
            load.className = 'load' + (lim && others >= lim ? ' is-full' : '');
            load.textContent = lim ? `${others}/${lim}` : others;
            btn.appendChild(load);
          }
          btn.addEventListener('click', () => focusDay(date));
        } else {
          // Modo ocupación: chips por cargo con su carga.
          btn.className = 'cday cday--info';
          btn.disabled = true;
          btn.innerHTML = `<span class="n">${d}</span>`;
          const cell = occ[date];
          if (cell) {
            const chips = document.createElement('span');
            chips.className = 'chips';
            for (const role of Object.keys(cal.roles)) {
              const h = held(cell[role]);
              if (!h) continue;
              const lim = cal.limits[role];
              const chip = document.createElement('span');
              chip.className = 'rchip' + (lim && h >= lim ? ' is-full' : '');
              chip.textContent = `${initials(cal.roles[role])}${h}`;
              chip.title = `${cal.roles[role]}: ${h}${lim ? ' / ' + lim : ''}`;
              chips.appendChild(chip);
            }
            if (chips.children.length) btn.appendChild(chips);
          }
        }
        days.appendChild(btn);
      }
      month.appendChild(days);
      months.appendChild(month);
    }
    grid.appendChild(months);
  }

  function rerender() {
    const y = window.scrollY;
    renderSidebar();
    renderGrid();
    if (!focusedDate) hideActionbar();
    window.scrollTo(0, y);
  }

  // ----- barra de acción por día -----

  function focusDay(date) {
    focusedDate = focusedDate === date ? null : date;
    const worker = workerById(selectedWorkerId);
    if (focusedDate && worker) {
      const status = worker.requests.find((r) => r.date === date)?.status;
      const human = new Date(date + 'T00:00:00').toLocaleDateString('es-ES', { weekday: 'long', day: 'numeric', month: 'long' });
      const label = status
        ? `${human} — ${({ approved: 'aprobado', pending: 'pendiente', rejected: 'rechazado' }[status])}`
        : `${human} — sin solicitar`;
      $('cal-action-label').textContent = label;
      $('cal-actionbar').classList.add('show');
    } else {
      hideActionbar();
    }
    // Repinta el foco sin perder scroll.
    rerender();
  }

  function hideActionbar() {
    focusedDate = null;
    $('cal-actionbar').classList.remove('show');
  }

  $('cal-actionbar').querySelectorAll('button[data-status]').forEach((b) => {
    b.addEventListener('click', () => {
      if (selectedWorkerId == null || !focusedDate) return;
      setStatus(selectedWorkerId, [focusedDate], b.dataset.status);
    });
  });

  // Aplica un cambio de estado en el servidor y refresca la vista.
  async function setStatus(workerId, dates, status) {
    if (!dates.length) return;
    try {
      const data = await fetchJSON(`/api/admin/rounds/${cal.round.id}/requests/set`, {
        method: 'POST',
        body: { worker_id: workerId, dates, status },
      });
      const w = workerById(workerId);
      if (w) w.requests = data.requests;
      const labels = { approved: 'Aprobado', rejected: 'Rechazado', pending: 'Pendiente', none: 'Quitado' };
      toast(`✓ ${labels[status]}${dates.length > 1 ? ` (${dates.length} días)` : ''}`);
      hideActionbar();
      rerender();
    } catch (ex) {
      toast(ex.message, true);
    }
  }

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

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