import { getMimeTypeFromUrl } from "../ui/MediaRenderer/mime/mime.js";

/**
 * @internal
 */
export async function resolveMimeType(url?: string) {
  if (!url) {
    return undefined;
  }
  const mimeType = getMimeTypeFromUrl(url);
  if (mimeType) {
    return mimeType;
  }

  const res = url.startsWith("blob:")
    ? await fetch(url)
    : await fetch(url, {
        method: "HEAD",
      });

  if (res.ok && res.headers.has("content-type")) {
    return res.headers.get("content-type") || undefined;
  }
  // we failed to resolve the mime type, return null
  return undefined;
}