package utils

import (
	"crypto/rand"
	"encoding/base64"
	"io"
	"strings"
)

// uuid本来长度16, 改成15，生成base64编码长度刚好20
// 参考代码 "github.com/google/uuid"
type UUID [15]byte

var randreader = rand.Reader //io.Reader

func GetUUID() string {
	var auuid UUID
	_, err := io.ReadFull(randreader, auuid[:])
	if err != nil {
		// fmt.Println("the error:" + err.Error())
		return ""
	}
	// 原来的uuid
	// var dst [16]byte
	// hex.Encode(dst[:], auuid[:])
	// return string(dst[:])
	s := base64.StdEncoding.EncodeToString(auuid[:])
	s = strings.ReplaceAll(s, "/", "a")
	s = strings.ReplaceAll(s, "+", "z")
	return s
}