const CACHE_NAME = 'janichat-v1';
const STATIC_ASSETS = ['/', '/index.html'];

self.addEventListener('install', (event) => {
  self.skipWaiting();
  event.waitUntil(
    caches.open(CACHE_NAME).then(cache => cache.addAll(STATIC_ASSETS).catch(() => {}))
  );
});

self.addEventListener('activate', (event) => {
  event.waitUntil(
    caches.keys().then(keys =>
      Promise.all(keys.filter(k => k !== CACHE_NAME).map(k => caches.delete(k)))
    )
  );
  self.clients.claim();
});

self.addEventListener('fetch', (event) => {
  if (event.request.url.includes('/api/') || event.request.url.includes('/ws')) return;
  event.respondWith(
    fetch(event.request).catch(() => caches.match(event.request))
  );
});

self.addEventListener('push', (event) => {
  let data = { title: 'JaniChat', body: 'Новое сообщение', chatId: null };
  try { data = event.data.json(); } catch {}

  event.waitUntil(
    self.clients.matchAll({ type: 'window', includeUncontrolled: true }).then(clients => {
      // Suppress if any app window is focused
      const appFocused = clients.some(c => c.focused);
      if (appFocused) return;
      return self.registration.showNotification(data.title, {
        body: data.body,
        icon: '/icon-192.png',
        badge: '/icon-192.png',
        data: { chatId: data.chatId },
        vibrate: [200, 100, 200],
      });
    })
  );
});

self.addEventListener('notificationclick', (event) => {
  event.notification.close();
  const chatId = event.notification.data?.chatId;
  const url = chatId ? `/?chat=${chatId}` : '/';

  event.waitUntil(
    self.clients.matchAll({ type: 'window', includeUncontrolled: true }).then(clients => {
      for (const client of clients) {
        if (client.url.includes(self.location.origin) && 'focus' in client) {
          client.postMessage({ type: 'open_chat', chatId });
          return client.focus();
        }
      }
      return self.clients.openWindow(url);
    })
  );
});