/**
 * perform the regEx to number conversion
 * @param reg
 * @param timeCheck
 */
function doRegEx(reg : RegExp, timeCheck: string) : number {

  if (!timeCheck || timeCheck.length === 0) return 0;

  const result = reg.exec(timeCheck);

  if (result && result.length > 0)
    return parseInt(result[1], 10);
  else return 0;

}

/**
 * Get milliseconds from a string of time sections
 * @param inTime *
 * @signature
 *    U.timeToMilliseconds(inTime)
 * @example
 *    U.timeToMilliseconds('1s')  // => 1000
 *    U.timeToMilliseconds('1min') // => 60000
 *    U.timeToMilliseconds('1 weeks') // => 604800000
 *    U.timeToMilliseconds('5y2w30d14h30m10s') // => 161641810000
 *    U.timeToMilliseconds('1 hour and 5 seconds') // => 3605000
 */

export function timeToMilliseconds(inTime = '') : number {

  const workTime = inTime || '';

  const years = doRegEx(/(\d+)(?:\s*(?:year[s]?|y))+/gi, workTime) * 31557600000;
  const weeks = doRegEx(/(\d+)(?:\s*(?:week[s]?|w))+/gi, workTime) * 604800000;
  const days = doRegEx(/(\d+)(?:\s*(?:day[s]?|d))+/gi, workTime) * 86400000;
  const hours = doRegEx(/(\d+)(?:\s*(?:hour[s]?|h))+/gi, workTime) * 3600000;
  const minutes = doRegEx(/(\d+)(?:\s*(?:minutes[s]?|min[s]?|m))+/gi, workTime) * 60000;
  const seconds = doRegEx(/(\d+)(?:\s*(?:second[s]?|sec[s]?|s))+/gi, workTime) * 1000;

  return years + weeks + days + hours + minutes + seconds;

}