const CACHE_NAME = "pantryhub-static-v8";

self.addEventListener("install", () => {
    self.skipWaiting();
});

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

self.addEventListener("fetch", (event) => {
    if (event.request.method !== "GET") return;

    const url = new URL(event.request.url);
    if (url.origin !== self.location.origin) return;

    // Authenticated HTML and API responses must never be served from stale cache.
    if (event.request.mode === "navigate" || url.pathname.startsWith("/api/")) {
        event.respondWith(fetch(event.request));
        return;
    }

    event.respondWith(
        caches.match(event.request).then((cached) => {
            if (cached) return cached;
            return fetch(event.request).then((response) => {
                if (response.ok && response.type === "basic") {
                    const copy = response.clone();
                    caches.open(CACHE_NAME).then((cache) => cache.put(event.request, copy));
                }
                return response;
            });
        })
    );
});