export function parseLsn(lsn: string): bigint {
  const [a, b] = lsn.split("/").map((x) => BigInt(parseInt(x, 16)));
  return (a << BigInt(32)) + b;
}

export function isLsn(lsn: string): boolean {
  return !!lsn.match(/^[0-9a-f]+\/[0-9a-f]+$/i);
}

export function subtractLsn(lsn1: string, lsn2: string): number | null {
  return isLsn(lsn1) && isLsn(lsn2)
    ? Math.max(0, Math.round(Number(parseLsn(lsn1) - parseLsn(lsn2))))
    : null;
}