const calendarId = new URLSearchParams(window.location.search).get('calendarId');
let calendar = null;

const weekdayBoard = document.getElementById('weekdayBoard');
const weekendWrap = document.getElementById('weekendWrap');
const legend = document.getElementById('legend');
const toast = document.getElementById('toast');

function showToast(msg) {
  toast.textContent = msg;
  toast.classList.add('show');
  setTimeout(() => toast.classList.remove('show'), 1800);
}

function debounce(fn, ms) {
  let t;
  return (...args) => { clearTimeout(t); t = setTimeout(() => fn(...args), ms); };
}

const handlers = {
  onToggleDone: (taskId, done) => api.patch(`/api/calendars/${calendarId}/tasks/${taskId}`, { done }).catch(() => showToast('Could not save')),
  onTextEdit: (taskId, text) => api.patch(`/api/calendars/${calendarId}/tasks/${taskId}`, { text }).catch(() => showToast('Could not save')),
  onLabelEdit: (blockKey, label) => api.patch(`/api/calendars/${calendarId}/blocks/${blockKey}`, { label }).catch(() => showToast('Could not save')),
  onAddTask: async (dayOfWeek, blockKey, text) => {
    const { task } = await api.post(`/api/calendars/${calendarId}/tasks`, { dayOfWeek, blockKey, text });
    return task;
  },
  onDeleteTask: (taskId) => api.del(`/api/calendars/${calendarId}/tasks/${taskId}`).catch(() => showToast('Could not delete')),
  onDurationEdit: (taskId, durationMinutes) => api.patch(`/api/calendars/${calendarId}/tasks/${taskId}`, { durationMinutes }).catch(() => showToast('Could not save')),
};

function todayName() {
  return new Date().toLocaleDateString('en-US', { weekday: 'long' });
}

function draw() {
  const childNameEl = document.getElementById('childName');
  if (document.activeElement !== childNameEl) childNameEl.textContent = calendar.childName || '';
  const titleEl = document.getElementById('calTitle');
  if (document.activeElement !== titleEl) titleEl.textContent = calendar.title;

  renderCalendar({
    calendar,
    editable: true,
    weekdayBoard,
    weekendWrap,
    handlers,
    todayName: todayName(),
  });
  renderLegend(legend, calendar);

  weekendWrap.classList.toggle('hidden', !calendar.showWeekend);
  document.getElementById('toggleWeekend').textContent = calendar.showWeekend ? 'Hide weekend' : 'Show weekend';

  buildPeriodToggles();
}

function buildPeriodToggles() {
  const el = document.getElementById('periodToggles');
  el.querySelectorAll('label.opt').forEach((n) => n.remove());
  calendar.blocks.forEach((block) => {
    const label = document.createElement('label');
    label.className = 'opt';
    const cb = document.createElement('input');
    cb.type = 'checkbox';
    cb.checked = !document.body.classList.contains('hide-' + block.key);
    cb.onchange = () => document.body.classList.toggle('hide-' + block.key, !cb.checked);
    const span = document.createElement('span');
    span.textContent = block.label;
    label.appendChild(cb);
    label.appendChild(span);
    el.appendChild(label);
  });
}

async function load() {
  if (!calendarId) {
    document.body.innerHTML = '<p style="padding:40px;">No calendar selected. <a href="/dashboard.html">Back to dashboard</a></p>';
    return;
  }
  try {
    const data = await api.get(`/api/calendars/${calendarId}`);
    calendar = data.calendar;
  } catch (err) {
    if (err.status === 401) { window.location.href = '/login.html'; return; }
    document.body.innerHTML = `<p style="padding:40px;">${err.message}. <a href="/dashboard.html">Back to dashboard</a></p>`;
    return;
  }
  draw();
}

document.getElementById('toggleWeekend').addEventListener('click', async () => {
  calendar.showWeekend = !calendar.showWeekend;
  weekendWrap.classList.toggle('hidden', !calendar.showWeekend);
  document.getElementById('toggleWeekend').textContent = calendar.showWeekend ? 'Hide weekend' : 'Show weekend';
  await api.patch(`/api/calendars/${calendarId}`, { showWeekend: calendar.showWeekend });
});

document.getElementById('resetChecks').addEventListener('click', async () => {
  const data = await api.post(`/api/calendars/${calendarId}/reset-checks`);
  calendar = data.calendar;
  draw();
  showToast('Checkboxes reset');
});

document.getElementById('printBtn').addEventListener('click', () => window.print());

const titleEl = document.getElementById('calTitle');
titleEl.addEventListener('keydown', (e) => { if (e.key === 'Enter') { e.preventDefault(); titleEl.blur(); } });
const debouncedTitleSave = debounce(() => {
  if (titleEl.textContent.trim()) api.patch(`/api/calendars/${calendarId}`, { title: titleEl.textContent.trim() });
}, 500);
titleEl.addEventListener('input', debouncedTitleSave);

const childNameEl = document.getElementById('childName');
childNameEl.addEventListener('keydown', (e) => { if (e.key === 'Enter') { e.preventDefault(); childNameEl.blur(); } });
const debouncedChildNameSave = debounce(() => {
  if (childNameEl.textContent.trim()) api.patch(`/api/children/${calendar.childId}`, { name: childNameEl.textContent.trim() });
}, 500);
childNameEl.addEventListener('input', debouncedChildNameSave);

// Polling keeps this view in sync with kiosk checkbox taps (and the other
// parent's edits) without a manual reload. Paused while the parent is mid-edit
// in any contenteditable field, so an incoming poll can't yank their cursor.
function isEditableTarget(el) {
  // isContentEditable covers task/label/title/child-name text; duration is a
  // plain <input type=number> instead (isContentEditable is always false for
  // form fields), so it needs its own explicit check — a narrow class match
  // rather than a blanket tag check, so unrelated inputs elsewhere (e.g. the
  // period-toggle checkboxes, which commit instantly and don't need this)
  // aren't also paused.
  return !!el && (el.isContentEditable || el.classList.contains('duration-input'));
}

let isEditingFocused = false;
document.addEventListener('focusin', (e) => {
  if (isEditableTarget(e.target)) isEditingFocused = true;
});
document.addEventListener('focusout', (e) => {
  if (isEditableTarget(e.target)) {
    setTimeout(() => {
      isEditingFocused = isEditableTarget(document.activeElement);
    }, 0);
  }
});

async function poll() {
  if (!calendar || isEditingFocused || document.hidden) return;
  try {
    const data = await api.get(`/api/calendars/${calendarId}/poll?since=${encodeURIComponent(calendar.updatedAt)}`);
    if (data.changed) {
      calendar = data.calendar;
      draw();
    }
  } catch (err) {
    if (err.status === 401) window.location.href = '/login.html';
  }
}
setInterval(poll, 4000);
document.addEventListener('visibilitychange', () => { if (!document.hidden) poll(); });

load();