package utils

import "time"

//获取下周周四
func GetNextWeekThursday(t time.Time, fmtStr string) (day string, err error) {
	monday := getMondayOfWeek(t, fmtStr)
	dayObj, err := time.Parse(fmtStr, monday)
	if err != nil {
		return
	}
	day = dayObj.AddDate(0, 0, 10).Format(fmtStr)
	return
}

//获取下周周三
func GetNextNextWeekWednesday(t time.Time, fmtStr string) (day string, err error) {
	monday := getMondayOfWeek(t, fmtStr)
	dayObj, err := time.Parse(fmtStr, monday)
	if err != nil {
		return
	}
	day = dayObj.AddDate(0, 0, 15).Format(fmtStr)
	return
}

func getMondayOfWeek(t time.Time, fmtStr string) (dayStr string) {
	dayObj := getZeroTime(t)
	if t.Weekday() == time.Monday {
		//修改hour、min、sec = 0后格式化
		dayStr = dayObj.Format(fmtStr)
	} else {
		offset := int(time.Monday - t.Weekday())
		if offset > 0 {
			offset = -6
		}
		dayStr = dayObj.AddDate(0, 0, offset).Format(fmtStr)
	}
	return
}

//获取某一天的0点时间
func getZeroTime(t time.Time) time.Time {
	return time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, t.Location())
}