import { FRONTEND_URL, PUBLIC_URL } from "../config.ts";

const SELF_HOSTS = new Set(
  [PUBLIC_URL, FRONTEND_URL].flatMap((u) => {
    try {
      return [new URL(u).host.toLowerCase()];
    } catch {
      return [];
    }
  }),
);

const SELF_PATH_RE = /^\/(dumps|users|playlists)\/[^/]+$/;

/**
 * A link to one of this site's own dump, user or playlist pages. Matched on the
 * host as well as the path: `/users/bob` on some other site is someone else's
 * page, not ours.
 */
export function isSelfUrl(url: URL): boolean {
  return SELF_HOSTS.has(url.host.toLowerCase()) &&
    SELF_PATH_RE.test(url.pathname);
}