import type { FileMeta } from "@silverbulletmd/silverbullet/type/index";

export function utcDateString(mtime: number): string {
  return new Date(mtime).toUTCString();
}

export function authCookieName(host: string) {
  return `auth_${host.replaceAll(/\W/g, "_")}`;
}

export function fileMetaToHeaders(fileMeta: FileMeta) {
  return {
    "Content-Type": fileMeta.contentType,
    "X-Last-Modified": "" + fileMeta.lastModified,
    "X-Created": "" + fileMeta.created,
    "Cache-Control": "no-cache",
    "X-Permission": fileMeta.perm,
    "X-Content-Length": "" + fileMeta.size,
  };
}

export function headersToFileMeta(
  name: string,
  headers: Headers,
): FileMeta | undefined {
  if (headers.has("X-Last-Modified")) {
    // If this header is set, we need to pull out the rest also
    return {
      name,
      // The server may set a custom X-Content-Length header in case a GET request was sent with X-Get-Meta, in which case the body may be omitted
      size: headers.has("X-Content-Length")
        ? +headers.get("X-Content-Length")!
        : +headers.get("Content-Length")!,
      contentType: headers.get("Content-type")!,
      created: +(headers.get("X-Created") || "0"),
      lastModified: +(headers.get("X-Last-Modified") || "0"),
      perm: (headers.get("X-Permission") as "rw" | "ro") || "ro",
    };
  } else {
    // Otherwise: no file meta in headers
    return undefined;
  }
}