/* Página del trabajador: registro + calendario de la ronda. */
(() => {
  const token = location.pathname.split('/').pop();
  const api = (p) => `/api/round/${token}${p}`;

  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'];

  let state = null;          // respuesta del servidor
  let selected = new Set();  // fechas elegidas (con cambios sin guardar)
  let savedDates = new Set();

  // ---------- utilidades ----------

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

  const iso = (y, m, d) =>
    `${y}-${String(m + 1).padStart(2, '0')}-${String(d).padStart(2, '0')}`;

  // ---------- registro ----------

  function renderJoin() {
    $('join-card').classList.remove('hidden');
    const grid = $('role-grid');
    grid.innerHTML = '';
    for (const [value, label] of Object.entries(state.roles)) {
      const opt = document.createElement('label');
      opt.className = 'role-option';
      opt.innerHTML = `<input type="radio" name="role" value="${value}" required /><span class="dot"></span>${label}`;
      grid.appendChild(opt);
    }
    $('join-form').addEventListener('submit', async (e) => {
      e.preventDefault();
      const err = $('join-error');
      err.classList.remove('show');
      try {
        const role = document.querySelector('input[name=role]:checked')?.value;
        await fetchJSON(api('/join'), { method: 'POST', body: { name: $('name').value, role } });
        await load();
      } catch (ex) {
        err.textContent = ex.message;
        err.classList.add('show');
      }
    });
  }

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

  function renderCalendar() {
    $('join-card').classList.add('hidden');
    $('calendar-section').classList.remove('hidden');

    const { me, round } = state;
    const open = round.status === 'open';
    $('me-name').textContent = me.name;
    $('me-role').textContent = state.roles[me.role] || me.role;
    $('closed-banner').classList.toggle('hidden', open);
    $('calendar-hint').classList.toggle('hidden', !open);

    const today = new Date();
    const todayIso = iso(today.getFullYear(), today.getMonth(), today.getDate());

    const cal = $('calendar');
    cal.innerHTML = '';
    for (let m = 0; m < 12; m++) {
      const month = document.createElement('section');
      month.className = 'month';
      month.style.animationDelay = `${m * 40}ms`;
      month.innerHTML =
        `<h3>${MONTHS[m]} ${round.year}</h3>` +
        `<div class="dow">${DOW.map((d) => `<span>${d}</span>`).join('')}</div>`;

      const days = document.createElement('div');
      days.className = 'days';
      const first = new Date(round.year, m, 1);
      const blanks = (first.getDay() + 6) % 7; // semana empieza en lunes
      for (let i = 0; i < blanks; i++) days.appendChild(document.createElement('span'));

      const total = new Date(round.year, m + 1, 0).getDate();
      let monthHasCounts = false;
      for (let d = 1; d <= total; d++) {
        const date = iso(round.year, m, d);
        const btn = document.createElement('button');
        btn.type = 'button';
        btn.className = 'day';
        btn.dataset.date = date;
        btn.textContent = d;
        if (date < todayIso) btn.classList.add('past');
        if (state.counts[date]?.[me.role]) monthHasCounts = true;
        if (!open) btn.disabled = true;
        else btn.addEventListener('click', () => toggle(date, btn));
        days.appendChild(btn);
      }
      month.appendChild(days);

      // Minileyenda: solo si este mes tiene días ya pedidos por compañeros de tu cargo.
      if (monthHasCounts) {
        const legend = document.createElement('p');
        legend.className = 'month-legend';
        legend.innerHTML =
          '<span class="count-sample">N</span> compañeros de tu mismo cargo que ya han pedido ese día';
        month.appendChild(legend);
      }

      cal.appendChild(month);
    }
    paint();
  }

  function toggle(date, btn) {
    if (selected.has(date)) selected.delete(date);
    else selected.add(date);
    btn.classList.toggle('selected', selected.has(date));
    updateBars();
  }

  // Pinta selección y contadores de compañeros del mismo cargo.
  function paint() {
    const role = state.me.role;
    document.querySelectorAll('.day').forEach((btn) => {
      const date = btn.dataset.date;
      btn.classList.toggle('selected', selected.has(date));
      btn.querySelector('.count')?.remove();
      const n = state.counts[date]?.[role];
      if (n) {
        const b = document.createElement('span');
        b.className = 'count';
        b.textContent = n;
        btn.appendChild(b);
      }
    });
    updateBars();
  }

  function updateBars() {
    $('me-count').textContent = selected.size;
    const dirty =
      selected.size !== savedDates.size || [...selected].some((d) => !savedDates.has(d));
    const bar = $('savebar');
    bar.classList.toggle('show', dirty && state.round.status === 'open');
    $('save-label').textContent =
      selected.size === 1 ? '1 día elegido' : `${selected.size} días elegidos`;
  }

  $('save-btn').addEventListener('click', async () => {
    const btn = $('save-btn');
    btn.disabled = true;
    try {
      const data = await fetchJSON(api('/requests'), {
        method: 'PUT',
        body: { dates: [...selected] },
      });
      savedDates = new Set(data.dates);
      selected = new Set(data.dates);
      state.counts = data.counts;
      paint();
      toast('✓ Petición guardada');
    } catch (ex) {
      toast(ex.message, true);
    } finally {
      btn.disabled = false;
    }
  });

  // ---------- carga inicial ----------

  async function load() {
    try {
      state = await fetchJSON(api(''));
    } catch {
      $('round-title').textContent = 'Ronda no encontrada';
      return;
    }
    $('round-title').innerHTML =
      `${state.round.name} <em>${state.round.year}</em>`;
    $('round-sub').textContent = state.me
      ? 'Marca en el calendario los días que quieres pedir'
      : 'Pide tus días de vacaciones en un minuto';
    document.title = `Vacaciones · ${state.round.name} ${state.round.year}`;

    if (state.me) {
      savedDates = new Set(state.me.dates);
      selected = new Set(state.me.dates);
      renderCalendar();
    } else if (state.round.status !== 'open') {
      $('closed-banner').classList.remove('hidden');
      $('round-sub').textContent = 'Esta ronda ya no admite peticiones.';
    } else {
      renderJoin();
    }
  }

  load();
})();