/* coi-serviceworker.js - Cross-Origin Isolation + PWA support */

// Service Worker context
self.addEventListener("install", () => self.skipWaiting());

self.addEventListener("activate", (event) =>
  event.waitUntil(self.clients.claim())
);

self.addEventListener("fetch", (event) => {
  if (event.request.method !== "GET") return;
  event.respondWith(
    fetch(event.request).then((response) => {
      if (response.status === 0 || response.type === "opaque") return response;
      const headers = new Headers(response.headers);
      headers.set("Cross-Origin-Embedder-Policy", "require-corp");
      headers.set("Cross-Origin-Opener-Policy", "same-origin");
      headers.set("Cross-Origin-Resource-Policy", "cross-origin");
      return new Response(response.body, {
        status: response.status,
        statusText: response.statusText,
        headers,
      });
    }).catch(() => fetch(event.request))
  );
});