import Hashids from "hashids";

const salt = process.env.HASHIDS_SALT ?? "";
const hashids = new Hashids(salt, 8);

export function encodeId(n: number): string {
  return hashids.encode(n);
}

export function decodeId(s: string): number | null {
  const decoded = hashids.decode(s);
  if (decoded.length !== 1) return null;
  const n = Number(decoded[0]);
  return Number.isFinite(n) && n > 0 ? n : null;
}