var staticCacheName = "pwa-v2";
var filesToCache = [
    '/public/img/pwa/icon-192x192.png',
    '/public/img/pwa/icon-512x512.png'
];

// Cache on install
self.addEventListener("install", event => {
    event.waitUntil(
        caches.open(staticCacheName)
            .then(cache => {
                return cache.addAll(filesToCache);
            })
            .then(() => self.skipWaiting())
    )
});

// Clear cache on activate
self.addEventListener('activate', event => {
    event.waitUntil(
        caches.keys().then(cacheNames => {
            return Promise.all(
                cacheNames
                    .filter(cacheName => (cacheName.startsWith("pwa-")))
                    .filter(cacheName => (cacheName !== staticCacheName))
                    .map(cacheName => caches.delete(cacheName))
            );
        }).then(() => self.clients.claim())
    );
});

// Navigation must prefer the network so cached redirects cannot mask auth state.
self.addEventListener("fetch", event => {
    if (event.request.method !== 'GET') {
        return;
    }

    if (event.request.mode === 'navigate') {
        event.respondWith(
            fetch(event.request)
                .catch(() => caches.match(event.request))
        );

        return;
    }

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