const CONTENT_CACHE_NAME = "healer-man-content-v1";
const BOOTSTRAP_CACHE_NAME = "healer-man-bootstrap-v1";
const OBJECT_HEADER = "x-healer-man-content-object";
const ENCODING_HEADER = "x-healer-man-content-encoding";
let bundledManifest;

function mimeType(path) {
  const extension = path.split(".").pop();
  return ({ glb: "model/gltf-binary", json: "application/json", js: "text/javascript", wasm: "application/wasm",
    ktx2: "image/ktx2", png: "image/png", webp: "image/webp", avif: "image/avif", svg: "image/svg+xml",
    mp3: "audio/mpeg", ogg: "audio/ogg", wav: "audio/wav", webm: "video/webm" })[extension] ?? "application/octet-stream";
}

async function decodedResponse(response, path, encoding) {
  if (encoding !== "gzip") return response;
  const headers = new Headers(response.headers);
  headers.set("content-type", mimeType(path));
  headers.delete("content-length");
  headers.delete("content-encoding");
  headers.delete(ENCODING_HEADER);
  return new Response(response.body.pipeThrough(new DecompressionStream("gzip")), { status: 200, headers });
}

async function bundledAsset(path) {
  if (!bundledManifest) {
    bundledManifest = fetch("/content/bootstrap-manifest.json", { cache: "no-cache" })
      .then((response) => response.ok ? response.json() : null)
      .catch(() => null);
  }
  const manifest = await bundledManifest;
  if (!manifest) { bundledManifest = null; return null; }
  const entry = manifest.files?.[path];
  if (!entry) return null;
  const object = entry.download ?? entry;
  // Older bootstrap catalogs served their original logical paths directly.
  if (!object.url.startsWith("/content/bundled/")) return fetch(path);
  const bootstrapCache = await caches.open(BOOTSTRAP_CACHE_NAME);
  const objectKey = new URL(object.url, self.location.origin).toString();
  let response = await bootstrapCache.match(objectKey);
  if (!response) {
    response = await fetch(object.url);
    if (response.ok) await bootstrapCache.put(objectKey, response.clone());
  }
  if (!response.ok) return response;
  if (entry.download) return decodedResponse(response, path, entry.download.encoding);
  return new Response(response.body, { headers: { "content-type": mimeType(path) } });
}
const MANAGED_ASSET_PREFIXES = [
  "/assets/characters/",
  "/assets/creatures/",
  "/assets/equipment/",
  "/assets/game/",
  "/assets/ui/",
  "/basis/",
  "/data/",
];
const BUNDLED_ASSET_PREFIXES = [
  "/assets/ui/",
  "/assets/equipment/",
  "/assets/characters/wow335a-v1/manifest.json",
  "/assets/characters/wow335a-v1/human/",
  "/assets/creatures/wailing-caverns/",
  "/assets/game/dungeons/wailing-caverns/",
];
const BUNDLED_ASSET_PATHS = new Set([
  "/assets/characters/wow335a-v1/textures/character/human/faciallowerhair00_00.webp",
  "/assets/characters/wow335a-v1/textures/character/human/facialupperhair00_00.webp",
  "/assets/characters/wow335a-v1/textures/character/human/female/humanfemalefacelower00_00.webp",
  "/assets/characters/wow335a-v1/textures/character/human/female/humanfemalefaceupper00_00.webp",
  "/assets/characters/wow335a-v1/textures/character/human/female/humanfemalenakedpelvisskin00_00.webp",
  "/assets/characters/wow335a-v1/textures/character/human/female/humanfemalenakedtorsoskin00_00.webp",
  "/assets/characters/wow335a-v1/textures/character/human/female/humanfemaleskin00_00.webp",
  "/assets/characters/wow335a-v1/textures/character/human/hair00_00.webp",
  "/assets/characters/wow335a-v1/textures/character/human/male/humanmalefacelower00_00.webp",
  "/assets/characters/wow335a-v1/textures/character/human/male/humanmalefaceupper00_00.webp",
  "/assets/characters/wow335a-v1/textures/character/human/male/humanmalenakedpelvisskin00_00.webp",
  "/assets/characters/wow335a-v1/textures/character/human/male/humanmaleskin00_00.webp",
  "/assets/characters/wow335a-v1/textures/character/human/scalplowerhair00_00.webp",
  "/assets/characters/wow335a-v1/textures/character/human/scalpupperhair00_00.webp",
]);

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

self.addEventListener("message", (event) => {
  if (event.data?.type === "refresh-content-bootstrap") bundledManifest = null;
});

self.addEventListener("activate", (event) => {
  event.waitUntil((async () => {
    const names = await caches.keys();
    await Promise.all(names
      .filter((name) => name.startsWith(`${CONTENT_CACHE_NAME}-staging-`)
        || (name.startsWith("healer-man-bootstrap-") && name !== BOOTSTRAP_CACHE_NAME))
      .map((name) => caches.delete(name)));
    await self.clients.claim();
  })());
});

self.addEventListener("fetch", (event) => {
  const { request } = event;
  if (request.method !== "GET") return;
  const url = new URL(request.url);
  if (url.origin !== self.location.origin
    || !MANAGED_ASSET_PREFIXES.some((prefix) => url.pathname.startsWith(prefix))) return;

  event.respondWith((async () => {
    const cache = await caches.open(CONTENT_CACHE_NAME);
    const cached = await cache.match(request, { ignoreSearch: true });
    if (cached) {
      const objectPath = cached.headers.get(OBJECT_HEADER);
      if (!objectPath) return cached;
      if (objectPath.startsWith("/content/cache-objects/")) {
        const object = await cache.match(new URL(objectPath, self.location.origin).toString());
        if (object) return decodedResponse(object, url.pathname, object.headers.get(ENCODING_HEADER));
      }
    }
    const bundled = await bundledAsset(url.pathname);
    if (bundled) return bundled;
    if (BUNDLED_ASSET_PATHS.has(url.pathname)
      || BUNDLED_ASSET_PREFIXES.some((prefix) => url.pathname.startsWith(prefix))) {
      return fetch(request);
    }
    return new Response("Optional content is not installed.", {
      status: 404,
      headers: { "content-type": "text/plain; charset=utf-8" },
    });
  })());
});