const RealDate = Date;
let now = null;
class MockDate extends RealDate {
  constructor(y, m, d, h, M, s, ms) {
    super();
    let date;
    switch (arguments.length) {
      case 0:
        if (now !== null)
          date = new RealDate(now.valueOf());
        else
          date = new RealDate();
        break;
      case 1:
        date = new RealDate(y);
        break;
      default:
        d = typeof d === "undefined" ? 1 : d;
        h = h || 0;
        M = M || 0;
        s = s || 0;
        ms = ms || 0;
        date = new RealDate(y, m, d, h, M, s, ms);
        break;
    }
    Object.setPrototypeOf(date, MockDate.prototype);
    return date;
  }
}
MockDate.UTC = RealDate.UTC;
MockDate.now = function() {
  return new MockDate().valueOf();
};
MockDate.parse = function(dateString) {
  return RealDate.parse(dateString);
};
MockDate.toString = function() {
  return RealDate.toString();
};
function mockDate(date) {
  const dateObj = new RealDate(date.valueOf());
  if (Number.isNaN(dateObj.getTime()))
    throw new TypeError(`mockdate: The time set is an invalid date: ${date}`);
  globalThis.Date = MockDate;
  now = dateObj.valueOf();
}
function resetDate() {
  globalThis.Date = RealDate;
}

export { RealDate as R, mockDate as m, resetDate as r };