const CACHE_NAME = "agendamax-shell-v1";
const SHELL_URLS = ["/", "/manifest.webmanifest", "/favicon.svg", "/icon-192.png", "/icon-512.png"];

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

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

self.addEventListener("fetch", (event) => {
  const { request } = event;
  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) => {
          if (request.credentials === "omit" && response.ok) {
            const copy = response.clone();
            void caches.open(CACHE_NAME).then((cache) => cache.put(request, copy));
          }
          return response;
        })
        .catch(() => caches.match("/"))
    );
    return;
  }

  const cacheableDestination = new Set(["script", "style", "image", "font", "manifest", "worker"]);
  if (request.credentials !== "omit" || !cacheableDestination.has(request.destination)) return;

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