package app

import (
	"sync"
	"time"
)

const monitoringBusinessTimeZoneName = "Asia/Shanghai"

var (
	monitoringBusinessLocationOnce  sync.Once
	monitoringBusinessLocationValue *time.Location
)

func monitoringBusinessLocation() *time.Location {
	monitoringBusinessLocationOnce.Do(func() {
		loc, err := time.LoadLocation(monitoringBusinessTimeZoneName)
		if err != nil {
			monitoringBusinessLocationValue = time.FixedZone("UTC+8", 8*60*60)
			return
		}
		monitoringBusinessLocationValue = loc
	})

	return monitoringBusinessLocationValue
}

func monitoringCanonicalBusinessDay(day time.Time) time.Time {
	return monitoringBusinessDayAt(day, monitoringBusinessLocation())
}

func monitoringBusinessDayAndDateAt(now time.Time) (time.Time, string) {
	businessDay := monitoringCanonicalBusinessDay(now)
	return businessDay, businessDay.Format("2006-01-02")
}

func monitoringBusinessDateText(businessDay time.Time) string {
	return monitoringCanonicalBusinessDay(businessDay).Format("2006-01-02")
}