const CACHE = "posimai-chronicle-v1";
const STATIC = ["/", "/index.html", "/manifest.json", "/logo.svg"];

self.addEventListener("install", e => {
    e.waitUntil(caches.open(CACHE).then(c => c.addAll(STATIC)));
    self.skipWaiting();
});

self.addEventListener("activate", e => {
    e.waitUntil(
        caches.keys().then(keys => Promise.all(keys.filter(k => k !== CACHE).map(k => caches.delete(k))))
            .then(() => self.clients.claim())
    );
});

self.addEventListener("fetch", e => {
    if (e.request.method !== "GET") return;
    if (!e.request.url.startsWith(self.location.origin)) return;

    e.respondWith(
        caches.open(CACHE).then(cache =>
            cache.match(e.request).then(cached => {
                const network = fetch(e.request).then(res => {
                    if (res.ok && res.type === "basic") cache.put(e.request, res.clone());
                    return res;
                }).catch(() => cached);
                return cached || network;
            })
        )
    );
});