import { create_salt } from '@sapphirecode/crypto-helper';
import { to_b58 } from '@sapphirecode/encoding-helper';

export function generate_token_id (valid_until: Date) {
  const salt = create_salt ();
  return `${to_b58 (salt, 'hex')};${valid_until.toISOString ()}`;
}

export function parse_token_id (id: string) {
  // eslint-disable-next-line max-len
  const regex = /^(?<hash>[A-HJ-NP-Za-km-z1-9]+);(?<date>\d{4}-[01]\d-[0-3]\dT[0-2]\d:[0-5]\d:[0-5]\d\.\d{3}Z)$/u;
  const result = regex.exec (id);
  if (result === null)
    throw new Error (`invalid token id ${id}`);
  if (typeof result.groups === 'undefined')
    throw new Error ('invalid state');
  return {
    hash:        result.groups.hash as string,
    valid_until: new Date (result.groups.date as string)
  };
}