tcodec

var (
	InvalidISOWeekString   = errors.New("Invalid ISOWeek string")
	InvalidWeekNumberError = errors.New("Invalid week number")
)

var (
	ErrNilDecoder = errors.New("Nil time decoder")
)

var ISOWeekCodec = NewTimeCodec(func(t time.Time) string {
	y, d := t.ISOWeek()
	return fmt.Sprintf("%d-%02d", y, d)

}, func(value string) (time.Time, error) {
	match := isoweekRx.FindStringSubmatch(value)
	if match == nil {
		return time.Time{}, InvalidISOWeekString
	}
	year, _ := strconv.Atoi(string(match[1]))
	week, _ := strconv.Atoi(string(match[2]))
	if !(0 < week && week <= 53) {
		return time.Time{}, InvalidWeekNumberError
	}
	t := time.Date(year, 1, 0, 0, 0, 0, 0, time.UTC)
	for t.Weekday() > time.Sunday {
		t = t.Add(-24 * time.Hour)
	}
	t = t.Add(time.Duration(week+1) * 7 * 24 * time.Hour)
	return t, nil
})

var MillisTimeCodec = UnixMillisTimeCodec(0)