export function calculateAge(start: Date, end = new Date()) {
  if (start.getTime() > end.getTime()) return null;

  let year = end.getFullYear() - start.getFullYear();
  let month = end.getMonth() - start.getMonth();
  let day = end.getDate() - start.getDate();

  if (month < 0) {
    month += 12;
    year -= 1;
  }
  if (day < 0) {
    month -= 1;
    day =
      new Date(start.getFullYear(), start.getMonth(), 0).getDate() -
      start.getDate() +
      end.getDate();
  }

  return { year, month, day };
}

export function calculateRetireDate(birthDate: Date) {
  let dd = birthDate.getDate();
  let mm = birthDate.getMonth();
  let yy = birthDate.getFullYear();

  let flag = true;

  switch (mm) {
    case 10:
      if (dd >= 2) flag = false;
      break;
    case 11:
      break;
    case 12:
      break;
  }

  if (flag) return new Date(`${yy + 60}-09-30T00:00:00.000+07:00`);

  return new Date(`${yy + 61}-09-30T00:00:00.000+07:00`);
}
export function calculateRetireLaw(birthDate: Date) {
  let yy = birthDate.getFullYear();
  return new Date(`${yy + 60}-09-30T00:00:00.000+07:00`);
}

export function calculateRetireYear(birthDate: Date) {
  let dd = birthDate.getDate();
  let mm = birthDate.getMonth();
  let yy = birthDate.getFullYear();

  let flag = true;

  switch (mm) {
    case 10:
      if (dd >= 2) flag = false;
      break;
    case 11:
      break;
    case 12:
      break;
  }

  if (flag) return yy + 60;

  return yy + 61;
}