/* KCA app-shell service worker. It caches only the static shell, never API
 * responses: certificate and key material must not be served stale. */
const CACHE = "kca-shell-v1";
const SHELL = ["/", "/manifest.webmanifest", "/icons/icon.svg"];

self.addEventListener("install", (event) => {
    event.waitUntil(caches.open(CACHE).then((cache) => cache.addAll(SHELL)).then(() => self.skipWaiting()));
});

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

self.addEventListener("fetch", (event) => {
    const request = event.request;
    if (request.method !== "GET") return;
    const url = new URL(request.url);
    if (url.origin !== self.location.origin) return;
    if (url.pathname.startsWith("/api/") || url.pathname.startsWith("/auth/")) return;
    event.respondWith(
        caches.match(request).then((cached) => cached || fetch(request).catch(() => caches.match("/")))
    );
});