package xtime

import (
	"time"
)

// 刷新点：时间边界

func GetDuration(t time.Time) (d time.Duration) {
	return t.Sub(time.Now())
}

// 现在到明日刷新点的剩余时间间隔
func GetDurationToNextHour() (d time.Duration) {
	return GetDurationToNextNHour(1)
}

// 现在到第N天刷新点的剩余时间间隔 (n为1是明天)
func GetDurationToNextNHour(n int) (d time.Duration) {
	now := Now().StdTime()
	next := Now().AddHours(n).StartOfHour().StdTime()
	return next.Sub(now)
}

// 现在到明日刷新点的剩余时间间隔
func GetDurationToTomorrow() (d time.Duration) {
	return GetDurationToNextNDay(1)
}

// 现在到第N天刷新点的剩余时间间隔 (n为1是明天)
func GetDurationToNextNDay(n int) (d time.Duration) {
	now := Now().StdTime()
	next := Now().AddDays(n).StartOfDay().StdTime()
	return next.Sub(now)
}

// 现在到下周刷新点的剩余时间间隔
func GetDurationToNextWeek() (expiration time.Duration) {
	return GetDurationToNextNWeek(1)
}

// 现在到下N周刷新点的剩余时间间隔 (n为1是下周)
func GetDurationToNextNWeek(n int) (expiration time.Duration) {
	now := Now().StdTime()
	nextN := Now().AddWeeks(n).StartOfWeek().StdTime()
	return nextN.Sub(now)
}

// 现在到下月刷新点的剩余时间间隔
func GetDurationToNextMonth() (expiration time.Duration) {
	return GetDurationToNextNMonth(1)
}

// 现在到下N月刷新点的剩余时间间隔 (n为1是下月)
func GetDurationToNextNMonth(n int) (expiration time.Duration) {
	now := Now().StdTime()
	nextN := Now().AddMonths(n).StartOfMonth().StdTime()
	return nextN.Sub(now)
}

// 现在到下季度刷新点的剩余时间间隔
func GetDurationToNextQuarter() (expiration time.Duration) {
	return GetDurationToNextNQuarter(1)
}

// 现在到下N季度刷新点的剩余时间间隔 (n为1是下年)
func GetDurationToNextNQuarter(n int) (expiration time.Duration) {
	now := Now().StdTime()
	nextN := Now().AddQuarters(n).StartOfQuarter().StdTime()
	return nextN.Sub(now)
}

// 现在到下年刷新点的剩余时间间隔
func GetDurationToNextYear() (expiration time.Duration) {
	return GetDurationToNextNYear(1)
}

// 现在到下N年刷新点的剩余时间间隔 (n为1是下年)
func GetDurationToNextNYear(n int) (expiration time.Duration) {
	now := Now().StdTime()
	nextN := Now().AddYears(n).StartOfYear().StdTime()
	return nextN.Sub(now)
}