/* global self, caches, fetch, URL */

const CACHE = "dockdeck-shell-v1";
const SHELL = ["/", "/manifest.webmanifest", "/dockdeck-icon.svg"];

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

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

self.addEventListener("fetch", (event) => {
  const request = event.request;
  const url = new URL(request.url);
  if (
    request.method !== "GET" ||
    url.origin !== self.location.origin ||
    url.pathname.startsWith("/api/")
  )
    return;
  if (request.mode === "navigate") {
    event.respondWith(
      fetch(request)
        .then((response) => {
          const copy = response.clone();
          caches.open(CACHE).then((cache) => cache.put("/", copy));
          return response;
        })
        .catch(() => caches.match("/")),
    );
    return;
  }
  event.respondWith(
    caches.match(request).then(
      (cached) =>
        cached ||
        fetch(request).then((response) => {
          if (response.ok)
            caches
              .open(CACHE)
              .then((cache) => cache.put(request, response.clone()));
          return response;
        }),
    ),
  );
});