// Calendar widget dialog: view/week-start settings, per-user opt-in,
// weather, and the rendered preview. Not a page-load script --
// frame_layout.js fetches this widget's dialog HTML fragment, injects
// it into the shared <dialog>, points window.FRAME_API at this specific
// widget (/api/frames/{id}/widgets/{widget_id}), then calls
// initCalendarDialog(). Checkboxes are always sent explicitly as
// "true"/"false".

// Week-view-only settings (days/layout/start-offset) only matter when
// View is actually "Week"; "Week starts on" also matters for Month, so
// it gets its own, slightly looser condition. The start-offset row is
// further gated on the day count -- it's meaningless at the default 7
// days, where "Week starts on" governs instead (see
// calendar_render.py's _build_week).
function updateCalendarFieldVisibility() {
  const view = document.getElementById('calendar_view').value;
  const days = Number(document.getElementById('calendar_week_days').value);
  const isWeek = view === 'week';
  document.getElementById('calendar-week-start-row').style.display =
    (view === 'week' || view === 'month') ? '' : 'none';
  document.getElementById('calendar-week-days-row').style.display = isWeek ? '' : 'none';
  document.getElementById('calendar-week-layout-row').style.display = isWeek ? '' : 'none';
  document.getElementById('calendar-week-offset-row').style.display = (isWeek && days !== 7) ? '' : 'none';
}

function addWeatherCityRow(label) {
  const list = document.getElementById('weather-city-list');
  const empty = document.getElementById('weather-city-empty');
  if (empty) empty.remove();
  const li = document.createElement('li');
  li.className = 'checkbox-row';
  li.style.cssText = 'justify-content: space-between; margin-top: 6px;';
  const span = document.createElement('span');
  span.textContent = label;
  const btn = document.createElement('button');
  btn.type = 'button';
  btn.className = 'btn-inline secondary weather-city-remove';
  btn.dataset.label = label;
  btn.textContent = 'Remove';
  btn.addEventListener('click', removeWeatherCity);
  li.appendChild(span);
  li.appendChild(btn);
  list.appendChild(li);
}

async function removeWeatherCity(e) {
  const label = e.target.dataset.label;
  try {
    const resp = await fetch(`${window.FRAME_API}/weather-cities/remove`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ label }),
    });
    if (!resp.ok) throw new Error(await apiError(resp));
    e.target.closest('li').remove();
    const list = document.getElementById('weather-city-list');
    if (!list.querySelector('li')) {
      list.innerHTML = '<li class="sub" id="weather-city-empty">No cities added yet.</li>';
    }
    showStatus(true, `${label} removed.`);
    loadCalendarPreview();
  } catch (e) {
    showStatus(false, e.message);
  }
}

function loadCalendarPreview() {
  document.getElementById('calendar-preview').src = `${window.FRAME_API}/preview/calendar?_=${Date.now()}`;
}

function initCalendarDialog() {
  document.getElementById('calendar_view').addEventListener('change', updateCalendarFieldVisibility);
  document.getElementById('calendar_week_days').addEventListener('input', updateCalendarFieldVisibility);
  updateCalendarFieldVisibility();

  document.getElementById('calendar-config-form').addEventListener('submit', async (e) => {
    e.preventDefault();
    const body = new URLSearchParams({
      calendar_view: document.getElementById('calendar_view').value,
      calendar_week_start: document.getElementById('calendar_week_start').value,
      calendar_week_days: document.getElementById('calendar_week_days').value,
      calendar_week_layout: document.getElementById('calendar_week_layout').value,
      calendar_week_start_offset: document.getElementById('calendar_week_start_offset').value,
      calendar_render_style: document.getElementById('calendar_render_style').value,
    });
    try {
      const resp = await fetch(`${window.FRAME_API}/config`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
        body,
      });
      if (!resp.ok) throw new Error(await apiError(resp));
      showStatus(true, 'Saved.');
      loadCalendarPreview();
    } catch (e) {
      showStatus(false, e.message);
    }
  });

  // Each calendar's own include/mute toggle -- auto-saves on change, not
  // batched into the form above, since it's a data-sharing choice (see
  // api_widget_calendar_select), not a widget-wide setting. Works the
  // same element for your own calendars (full add/remove) and other
  // people's (mute only) -- the server enforces which direction is
  // allowed and this just reverts the checkbox with an error message if
  // rejected.
  document.querySelectorAll('.calendar-toggle').forEach((el) => {
    el.addEventListener('change', async () => {
      try {
        const resp = await fetch(`${window.FRAME_API}/calendar-select`, {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({
            user_id: Number(el.dataset.userId),
            calendar_key: el.dataset.key,
            calendar_label: el.dataset.label,
            included: el.checked,
          }),
        });
        if (!resp.ok) throw new Error(await apiError(resp));
        showStatus(true, el.checked ? 'Calendar included on this widget.' : 'Calendar removed from this widget.');
      } catch (e) {
        el.checked = !el.checked;
        showStatus(false, e.message);
      }
    });
  });

  // Per-calendar color pin -- owner-only (the server enforces it; these
  // buttons only ever render for the viewer's own calendars anyway).
  // Clicking the currently-selected swatch again has no special
  // "toggle off" behavior -- use the explicit Auto button.
  document.querySelectorAll('.calendar-color-picker').forEach((picker) => {
    const key = picker.dataset.key;
    picker.querySelectorAll('.color-swatch').forEach((btn) => {
      btn.addEventListener('click', async () => {
        const colorIndex = btn.dataset.index === '' ? null : Number(btn.dataset.index);
        try {
          const resp = await fetch(`${window.FRAME_API}/calendar-color`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ calendar_key: key, color_index: colorIndex }),
          });
          if (!resp.ok) throw new Error(await apiError(resp));
          picker.querySelectorAll('.color-swatch').forEach((el) => el.classList.remove('selected'));
          btn.classList.add('selected');
          showStatus(true, 'Color saved.');
          loadCalendarPreview();
        } catch (e) {
          showStatus(false, e.message);
        }
      });
    });
  });

  document.getElementById('weather-config-form').addEventListener('submit', async (e) => {
    e.preventDefault();
    const body = new URLSearchParams({
      calendar_weather_enabled: String(document.getElementById('weather_enabled').checked),
      calendar_weather_units: document.getElementById('weather_units').value,
    });
    try {
      const resp = await fetch(`${window.FRAME_API}/config`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
        body,
      });
      if (!resp.ok) throw new Error(await apiError(resp));
      showStatus(true, 'Saved.');
      loadCalendarPreview();
    } catch (e) {
      showStatus(false, e.message);
    }
  });

  document.querySelectorAll('.weather-city-remove').forEach((el) => el.addEventListener('click', removeWeatherCity));

  document.getElementById('weather-city-add').addEventListener('click', async () => {
    const input = document.getElementById('weather-city-input');
    const name = input.value.trim();
    if (!name) return;
    try {
      const resp = await fetch(`${window.FRAME_API}/weather-cities/add`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ name }),
      });
      if (!resp.ok) throw new Error(await apiError(resp));
      const data = await resp.json();
      addWeatherCityRow(data.city.label);
      input.value = '';
      showStatus(true, `Added ${data.city.label}.`);
      loadCalendarPreview();
    } catch (e) {
      showStatus(false, e.message);
    }
  });

  document.getElementById('calendar-preview-refresh').addEventListener('click', loadCalendarPreview);
  loadCalendarPreview();
  initBorderFields();
  initFontScaleFields();
  initButtonActionFields();
}

function closeCalendarDialog() {
  // Nothing to tear down -- no poll interval, unlike the photos dialog.
}