package utilx

import (
	"bytes"
	"crypto/md5"
	"encoding/hex"
	"fmt"
	"log"
	"sort"
)

// 转转签名方法
func CreateZzSign(params map[string]interface{}, secretKey string) string {
	if len(params) == 0 {
		log.Println("参数为空，签名: 空字符串")
		return ""
	}

	// 将map转换为list，并按键排序
	var keys []string
	for k := range params {
		keys = append(keys, k)
	}
	sort.Strings(keys)
	var values []interface{}
	for _, k := range keys {
		values = append(values, params[k])
	}

	var buffer bytes.Buffer
	for i := 0; i < len(keys); i++ {
		buffer.WriteString(keys[i])
		buffer.WriteString("=")
		buffer.WriteString(fmt.Sprintf("%v", values[i]))
		buffer.WriteString("&")
	}
	buffer.WriteString("key=")
	buffer.WriteString(secretKey)
	preEncryptString := buffer.String()
	log.Println("排序后准备生成签名的字符串为:", preEncryptString)
	md5Digest := md5.Sum([]byte(preEncryptString))
	sign := hex.EncodeToString(md5Digest[:])
	log.Println("preEncryptString:", preEncryptString, "==> sign:", sign)
	return sign
}