self.addEventListener('push', (event) => {
  let payload = { title: 'E-Invite', body: '' };
  try {
    if (event.data) payload = event.data.json();
  } catch {
    // Ignore malformed payloads rather than crashing the service worker.
  }

  event.waitUntil(
    self.registration.showNotification(payload.title || 'E-Invite', {
      body: payload.body || '',
      data: { url: payload.url || '/' },
    })
  );
});

self.addEventListener('notificationclick', (event) => {
  event.notification.close();
  const url = event.notification.data?.url || '/';
  event.waitUntil(
    self.clients.matchAll({ type: 'window' }).then((clients) => {
      for (const client of clients) {
        if (client.url === url && 'focus' in client) return client.focus();
      }
      if (self.clients.openWindow) return self.clients.openWindow(url);
    })
  );
});