package utils

import (
	"fmt"
	"time"
)

func ParseUnixTimestamp2LocalTime(ts int64) (local time.Time) {
	sec := int64(0)
	nsec := int64(0)
	switch {
	case ts >= 1e18: // 纳秒
		sec = ts / int64(1e9)
		nsec = ts % int64(1e9)
	case ts >= 1e15: // 微妙
		sec = ts / int64(1e6)
		nsec = ts % int64(1e6)
	case ts >= 1e12: // 毫秒
		sec = ts / int64(1e3)
		nsec = ts % int64(1e3)
	case ts >= 1e9: // 秒
		sec = ts
		nsec = 0
	default:
		panic(fmt.Errorf("ts:%v invalid parse to local time"))
	}

	t := time.Unix(sec, nsec)
	ts2str := t.Format("2006-01-02 15:04:05.000000000")
	local, _ = time.ParseInLocation("2006-01-02 15:04:05.000000000", ts2str, time.Local)
	return local
}

// GetTimeZoneLocalTime 获取指定时区的当地时间
func GetTimeZoneLocalTime(timeZone int) time.Time {
	offsetZone := time.FixedZone(time.Local.String(), timeZone*60*60)
	return time.Now().In(offsetZone)
}

// GetTimeZoneLocalTimeByTimestamp 获取指定时间戳与时区的当地时间
func GetTimeZoneLocalTimeByTimestamp(ts int64, timeZone int) time.Time {
	offsetZone := time.FixedZone(time.Local.String(), timeZone*60*60)
	return time.Unix(ts, 0).Local().In(offsetZone)
}