// Installing service worker
const CACHE_NAME = 'backend-accounting-app';

/* Add relative URL of all the static content you want to store in
 * cache storage (this will help us use our app offline)*/
let resourcesToCache = [];
//let resourcesToCache = ["./", "./img/game.png", "./game.js", "./styles.css"];

self.addEventListener("install", e => {
    e.waitUntil(
            caches.open(CACHE_NAME).then(cache => {
        return cache.addAll(resourcesToCache);
    })
            );
});

// Cache and return requests
self.addEventListener("fetch", e => {
    e.respondWith(
            caches.match(e.request).then(response => {
        return response || fetch(e.request);
    })
            );
});

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