'use strict';

/**
 * Checks if the given value is a valid LastEventId.
 * @param {string} value
 * @returns {boolean}
 */
function isValidLastEventId(value) {
  // LastEventId should not contain U+0000 NULL
  return value.indexOf('\u0000') === -1;
}

/**
 * Checks if the given value is a base 10 digit.
 * @param {string} value
 * @returns {boolean}
 */
function isASCIINumber(value) {
  if (value.length === 0) return false;
  for (let i = 0; i < value.length; i++) {
    if (value.charCodeAt(i) < 0x30 || value.charCodeAt(i) > 0x39) return false;
  }
  return true;
}

// https://github.com/nodejs/undici/issues/2664
function delay(ms) {
  return new Promise((resolve) => {
    setTimeout(resolve, ms).unref();
  });
}

module.exports = {
  isValidLastEventId,
  isASCIINumber,
  delay,
};