(() => {
  const { summary, serviceIds, locale, copy, states } = JSON.parse(document.getElementById('widget-data').textContent);
  const link = document.querySelector('.widget'), label = document.querySelector('.label');
  let expiry, expiryTimer, pollTimer, active = false;
  link.href = new URL(`/?lang=${locale}`, location.origin).href;
  const notify = () => { if (parent !== window) parent.postMessage({ type: 'ridebus-status-widget', version: 1, status: link.dataset.status }, '*'); };
  function show(status) {
    link.dataset.status = status;
    label.textContent = copy[status];
    link.setAttribute('aria-label', `${copy.title}: ${copy[status]}`);
    notify();
  }
  function apply(data, elapsedMs = 0) {
    if (data?.version !== 1 || !states.includes(data.overall) || !Number.isFinite(data.generatedAt) || !Number.isFinite(data.expiresAt)) throw new Error('Invalid status');
    clearTimeout(expiryTimer);
    expiry = Date.now() + Math.max(0, Math.min(90000, data.expiresAt - data.generatedAt - elapsedMs));
    show(expiry > Date.now() ? data.overall : 'unknown');
    expiryTimer = setTimeout(() => show('unknown'), Math.max(0, expiry - Date.now()));
  }
  async function refresh() {
    if (active || document.hidden) return;
    active = true;
    clearTimeout(pollTimer);
    const started = performance.now();
    try {
      const url = new URL('/api/widget', location.origin);
      url.searchParams.set('services', serviceIds.join(','));
      const response = await fetch(url, { cache: 'no-store', credentials: 'omit', signal: AbortSignal.timeout(5000) });
      if (!response.ok) throw new Error('Status unavailable');
      const data = await response.json();
      apply(data, performance.now() - started);
    } catch { clearTimeout(expiryTimer); show('unknown'); }
    finally { active = false; if (!document.hidden) pollTimer = setTimeout(refresh, 30000); }
  }
  window.addEventListener('message', event => {
    if (event.source === parent && event.data?.type === 'ridebus-status-widget-request') {
      if (Date.now() >= expiry) show('unknown'); else notify();
    }
  });
  document.addEventListener('visibilitychange', () => {
    clearTimeout(pollTimer);
    if (!document.hidden) { if (Date.now() >= expiry) show('unknown'); void refresh(); }
  });
  window.addEventListener('online', () => void refresh());
  window.addEventListener('offline', () => { clearTimeout(expiryTimer); show('unknown'); });
  apply(summary, performance.now());
  pollTimer = setTimeout(refresh, 30000);
})();