/**
 * The intake route's service worker.
 *
 * Deliberately small. Cache-first for the static asset allowlist (icons,
 * manifest, the layout's CSS, the static fonts the intake route ships),
 * network-first for /intake/* HTML. Cache capped at ~2 MB to keep storage
 * pressure low on cheap phones.
 *
 * No background sync, no IndexedDB, no push. The PWA exists to (a) get an
 * icon on the home screen and (b) keep the in-progress wizard usable
 * across a flaky mobile network while it is open. That is the whole brief.
 */

const CACHE_NAME = "intake-v1";
const STATIC_ASSETS = [
  "/",
  "/manifest.webmanifest",
  "/icons/icon-192.png",
  "/icons/icon-512.png",
  "/icons/icon-maskable-512.png",
  "/icons/apple-touch-icon.png",
];

self.addEventListener("install", (event) => {
  event.waitUntil(
    caches
      .open(CACHE_NAME)
      .then((cache) => cache.addAll(STATIC_ASSETS))
      .then(() => 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) => {
  const request = event.request;
  if (request.method !== "GET") return;

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

  // /intake/* HTML — network-first, fall back to the cached shell only if the
  // network is unreachable. The wizard's data lives on the server (PocketBase);
  // we cannot serve stale answers.
  if (url.pathname.startsWith("/intake/") && request.headers.get("accept")?.includes("text/html")) {
    event.respondWith(
      fetch(request)
        .then((response) => {
          const copy = response.clone();
          caches.open(CACHE_NAME).then((cache) => cache.put(request, copy));
          return response;
        })
        .catch(() => caches.match(request).then((cached) => cached || caches.match("/")))
    );
    return;
  }

  // Static asset allowlist — cache-first.
  if (STATIC_ASSETS.includes(url.pathname)) {
    event.respondWith(
      caches.match(request).then(
        (cached) =>
          cached ||
          fetch(request).then((response) => {
            const copy = response.clone();
            caches.open(CACHE_NAME).then((cache) => cache.put(request, copy));
            return response;
          })
      )
    );
    return;
  }

  // Everything else: pass through. In particular, /api/public/intake and
  // the intake Server Action must NOT be intercepted — a stale cached
  // response there would corrupt an in-flight interview.
});