package ditime

import (
	"time"
)

// Time is a DI-Net timestamp in milliseconds (UNIX in milliseconds)
type Time uint64

const milliToNano = int64(time.Millisecond) / int64(time.Nanosecond)

// Now gets the current local DI-Net timestamp (based on the UNIX timestamp)
func Now() Time {
	return FromTime(time.Now())
}

// ToTime converts the DI-Net time to golang time.Time
func (t Time) ToTime() time.Time {
	return ToTime(t)
}

// String gets the string presentation of time
func (t Time) String() string {
	return t.ToTime().String()
}

// Sub returns the duration t-u. If the result exceeds the maximum (or minimum)
//  value that can be stored in a Duration, the maximum (or minimum) duration will be returned.
func (t Time) Sub(u Time) time.Duration {
	return t.ToTime().Sub(u.ToTime())
}

// Format Format returns a textual representation of the time value formatted according to layout
//  which is compatible with stdlib time.Time.Format(layout)
func (t Time) Format(layout string) string {
	return t.ToTime().Format(layout)
}

// FromTime converts golang time.Time to DI-Net Time
func FromTime(tm time.Time) Time {
	return Time(tm.UTC().UnixNano() / milliToNano)
}

// ToTime converts DI-Net Time to golang time.Time
func ToTime(ms Time) time.Time {
	return time.Unix(int64(ms/1000), int64(ms%1000)*milliToNano)
}