service-worker.js

const CACHE_NAME = 'talkomatic-cache-v1';
const urlsToCache = [
  '/',
  '/index.html',
  '/styles.css',
  '/scripts.js',
  '/images/favicon.jpg',
  '/no-internet.html'
];

// Install the service worker
self.addEventListener('install', event => {
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then(cache => {
        return cache.addAll(urlsToCache);
      })
  );
});

// Cache and return requests
self.addEventListener('fetch', event => {
  event.respondWith(
    fetch(event.request).catch(() => caches.match(event.request).then(response => {
      if (response) {
        return response;
      } else if (event.request.headers.get("accept").includes("text/html")) {
        return caches.match('/no-internet.html');
      }
    }))
  );
});

// Update the service worker
self.addEventListener('activate', event => {
  const cacheWhitelist = [CACHE_NAME];
  event.waitUntil(
    caches.keys().then(cacheNames => {
      return Promise.all(
        cacheNames.map(cacheName => {
          if (cacheWhitelist.indexOf(cacheName) === -1) {
            return caches.delete(cacheName);
          }
        })
      );
    })
  );
});

// Push notification
self.addEventListener('push', event => {
  const title = 'Talkomatic Notification';
  const options = {
    body: 'Open the app to see if anyone is online.',
    icon: '/images/favicon.jpg',
    badge: '/images/favicon.jpg'
  };

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

self.addEventListener('notificationclick', event => {
  event.notification.close();
  event.waitUntil(
    clients.openWindow('/')
  );
});