const CACHE_NAME = 'lips-pwa';
const urlsToCache = ['/',
		     '/index.html',
		     '/app.scm',
		     '/manifest.json',
		     'https://cdn.jsdelivr.net/npm/lips@beta/dist/lips.min.js',
		     'https://cdnjs.cloudflare.com/ajax/libs/mithril/2.2.2/mithril.min.js'];

// Install event: cache the assets
self.addEventListener('install', event => {
    event.waitUntil(
	caches.open(CACHE_NAME)
	    .then(cache => {
		console.log('Opened cache');
		return cache.addAll(urlsToCache);
	    })
    );
});

// Fetch event: serve cached assets when offline
self.addEventListener('fetch', event => {
    event.respondWith(
	caches.match(event.request)
	    .then(response => {
		// Cache hit - return the response
		if (response) {
		    return response;
		}
		// Otherwise, fetch from network
		return fetch(event.request);
	    })
    );
});