const hexList = [];
for (let i = 0; i <= 15; i++) {
  hexList[i] = i.toString(16);
}

export function buildUUID(num = 36) {
  let uuid = '';
  for (let i = 1; i <= num; i++) {
    if (i === 9 || i === 14 || i === 19 || i === 24) {
      uuid += '-';
    } else if (i === 15) {
      uuid += 4;
    } else if (i === 20) {
      uuid += hexList[(Math.random() * 4) | 8];
    } else {
      uuid += hexList[(Math.random() * 16) | 0];
    }
  }
  return uuid.replace(/-/g, '');
}

let unique = 0;
export function buildShortUUID(prefix = '') {
  const time = Date.now();
  const random = Math.floor(Math.random() * 1000000000);
  unique++;
  return prefix + '_' + random + unique + String(time);
}
