/**
 * normalizeSteamId()
 *
 * @description Accepts either a plain numeric Steam app ID or a
 *   store.steampowered.com URL and returns the numeric app ID.
 *   Returns "" when the input is empty/missing (manual non-scrape flow
 *   looks games up by title instead) and `null` when the input is
 *   neither digits nor a recognized Steam Store URL.
 */
const normalizeSteamId = (value) => {
  const raw = String(value ?? "").trim();
  if (!raw) return "";

  const urlMatch = raw.match(
    /store\.steampowered\.com\/(?:agecheck\/)?app\/(\d+)/,
  );
  if (urlMatch) return urlMatch[1];

  if (/^\d+$/.test(raw)) return raw;

  return null;
};

export default normalizeSteamId;