const CACHE_NAME = "video-process-h264-v1";

export async function openCachedVideoResponse(
  url: string,
  signal: AbortSignal,
): Promise<{ response: Response; cacheState: "hit" | "miss" }> {
  if (typeof caches !== "undefined") {
    const cache = await caches.open(CACHE_NAME);
    const cached = await cache.match(url);
    if (cached) {
      return { response: cached, cacheState: "hit" };
    }
  }

  const response = await fetch(url, {
    signal,
    cache: "no-store",
  });

  if (!response.ok) {
    throw new Error(`请求失败：${response.status} ${response.statusText}`);
  }

  if (typeof caches !== "undefined") {
    const cache = await caches.open(CACHE_NAME);
    cache.put(url, response.clone()).catch(() => {
      // Cache Storage is best-effort.
    });
  }

  return { response, cacheState: "miss" };
}

export async function clearCachedVideoResponse(url: string): Promise<void> {
  if (typeof caches === "undefined") {
    return;
  }

  try {
    const cache = await caches.open(CACHE_NAME);
    await cache.delete(url);
  } catch {
    // Cache Storage is best-effort.
  }
}