const CACHE_NAME = 'teknav-v5';
const ASSETS_TO_CACHE = [
  '/',
  '/index.html',
  '/manifest.json',
  '/favicon.png'
];

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

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

self.addEventListener('fetch', (event) => {
  const { request } = event;
  if (request.method !== 'GET') return;
  const url = new URL(request.url);

  if (url.origin === location.origin && (url.pathname.startsWith('/article/') || url.pathname === '/' || url.pathname === '/articles')) {
    event.respondWith(
      fetch(request)
        .then((response) => {
          const copy = response.clone();
          caches.open(CACHE_NAME).then((cache) => cache.put(request, copy));
          return response;
        })
        .catch(() => caches.match(request).then((cached) => cached || caches.match('/index.html')))
    );
    return;
  }

  if (url.origin === location.origin && url.pathname.startsWith('/api/articles')) {
    event.respondWith(fetch(request));
    return;
  }

  if (request.headers.get('Accept')?.includes('text/html')) {
    event.respondWith(
      fetch(request)
        .then((response) => {
          const copy = response.clone();
          caches.open(CACHE_NAME).then((cache) => cache.put(request, copy));
          return response;
        })
        .catch(() => caches.match(request).then((cached) => cached || caches.match('/index.html')))
    );
    return;
  }

  event.respondWith(caches.match(request).then((response) => response || fetch(request)));
});

self.addEventListener('push', (event) => {
  const data = event.data ? event.data.json() : { title: 'تکناو', body: '', url: '/', icon: '/icons/icon-192x192.png' };
  event.waitUntil(
    self.registration.showNotification(data.title, {
      body: data.body,
      icon: data.icon || '/icons/icon-192x192.png',
      badge: '/icons/badge-72x72.png',
      dir: 'rtl',
      lang: 'fa',
      data: { url: data.url || '/' },
    })
  );
});

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