// Version: 1.0.0 | Created: 2026-04-27
// Web Push service worker for M8Chat.
// Receives push events from the browser and shows system notifications.
// This script is registered separately from flutter_service_worker.js.

'use strict';

self.addEventListener('push', function (event) {
  if (!event.data) return;

  let data = {};
  try {
    data = event.data.json();
  } catch (_) {
    data = { notification: { body: event.data.text() } };
  }

  // Sygnal delivers: { notification: { content: { body, msgtype, ... }, room_name, sender_display_name, ... } }
  const notif = data.notification || {};
  const content = notif.content || {};

  const sender = notif.sender_display_name || notif.sender || 'M8Chat';
  const room = notif.room_name || notif.room_alias || '';
  const body = content.body || notif.body || 'New message';

  const title = room ? `${sender} in ${room}` : sender;

  const options = {
    body: body,
    icon: '/icons/Icon-192.png',
    badge: '/icons/Icon-192.png',
    tag: notif.room_id || 'm8chat',
    data: {
      roomId: notif.room_id,
      url: self.location.origin + (notif.room_id
        ? '/rooms/' + encodeURIComponent(notif.room_id)
        : '/rooms'),
    },
    requireInteraction: false,
  };

  event.waitUntil(self.registration.showNotification(title, options));
});

self.addEventListener('notificationclick', function (event) {
  event.notification.close();

  const url = (event.notification.data && event.notification.data.url)
    ? event.notification.data.url
    : self.location.origin + '/rooms';

  event.waitUntil(
    clients.matchAll({ type: 'window', includeUncontrolled: true }).then(function (clientList) {
      for (const client of clientList) {
        if (client.url === url && 'focus' in client) {
          return client.focus();
        }
      }
      if (clients.openWindow) {
        return clients.openWindow(url);
      }
    })
  );
});