/**
 * Converts human friendly time to milliseconds. Supports the format
 * 00:00:00.000 for hours, minutes, seconds, and milliseconds respectively.
 * And 0ms, 0s, 0m, 0h, and together 1m1s.
 *
 * @param {String|Number} time
 * @return {Number}
 */
const numberFormat = /^\d+$/;
const timeFormat = /^(?:(?:(\d+):)?(\d{1,2}):)?(\d{1,2})(?:\.(\d{3}))?$/;
const timeUnits = {
  ms: 1,
  s: 1000,
  m: 60000,
  h: 3600000,
};
module.exports = (time) => {
  if (typeof time === 'number') { return time; }
  if (numberFormat.test(time)) { return +time; }
  const firstFormat = timeFormat.exec(time);
  if (firstFormat) {
    return +(firstFormat[1] || 0) * timeUnits.h +
      +(firstFormat[2] || 0) * timeUnits.m +
      +firstFormat[3] * timeUnits.s +
      +(firstFormat[4] || 0);
  } else {
    let total = 0;
    const r = /(-?\d+)(ms|s|m|h)/g;
    let rs;
    while ((rs = r.exec(time)) != null) {
      total += +rs[1] * timeUnits[rs[2]];
    }
    return total;
  }
};