package tools

import (
	"time"
)

// 计算时间差值

func RemainingTimeUntilNextFriday17() time.Duration {
	// 获取当前时间
	now := time.Now()

	// 计算下一个周五的时间
	nextFriday := GetNextWeekday(now, time.Friday)

	// 构造下一个周五 17 点的时间
	nextFriday17 := time.Date(nextFriday.Year(), nextFriday.Month(), nextFriday.Day(), 17, 0, 0, 0, nextFriday.Location())

	// 计算时间差
	duration := nextFriday17.Sub(now)

	return duration
}

// 获取下一个指定星期几的时间

func GetNextWeekday(t time.Time, weekday time.Weekday) time.Time {
	daysUntil := (int(weekday) - int(t.Weekday()) + 7) % 7
	if daysUntil == 0 {
		daysUntil = 7
	}
	return t.AddDate(0, 0, daysUntil)
}