package utils

import (
	"fmt"
	"github.com/bwmarrin/snowflake"
	"time"
)

func GetID() (string, error) {
	node, err := snowflake.NewNode(1)
	if err != nil {
		return "", err
	}
	return GetNowTimeUTC8().Format("20060102") + node.Generate().String(), nil
}

func GetNowTime() time.Time {
	//h, _ := time.ParseDuration("+8h")
	//return time.Now().UTC().Add(h)
	return time.Now()
}

func GetNowTimeUTC8() time.Time {
	// CST
	return time.Now().UTC().In(time.FixedZone("UTC", +8*3600))
}

const TIME_LAYOUT = "2006-01-02 15:04:05"

func ParseWithLocation(name string, timeStr string) (time.Time, error) {
	locationName := name
	if l, err := time.LoadLocation(locationName); err != nil {
		return time.Time{}, err
	} else {
		//转成带时区的时间
		lt, _ := time.ParseInLocation(TIME_LAYOUT, timeStr, l)
		//直接转成相对时间
		fmt.Println(time.Now().In(l).Format(TIME_LAYOUT))
		return lt, nil
	}
}