package utils

import (
	"github.com/gogf/gf/crypto/gmd5"
	"github.com/gogf/gf/util/gconv"
	"reflect"
	"sort"
	"strings"
)

var USign *SignUtil

func init() {
	USign = NewSignUtil()
}

type SignUtil struct {
}

func NewSignUtil() *SignUtil {
	return &SignUtil{}
}

func (s *SignUtil) Encryption(entity interface{}, suffix string) (string, error) {
	t := reflect.TypeOf(entity)
	v := reflect.ValueOf(entity)
	var signMap = make(map[string]interface{})
	for i := 0; i < t.NumField(); i++ {
		fieldType := t.Field(i)
		tag := fieldType.Tag.Get("sign")
		if tag != "" {
			signMap[tag] = v.Field(i).Interface()
		}
	}
	sign, err := s.SortJoin(signMap)
	if err != nil {

	}
	sign = sign + suffix

	sign, _ = gmd5.EncryptString(sign)
	return strings.ToUpper(sign), nil
}

func (s *SignUtil) SortJoin(eachMap map[string]interface{}) (string, error) {
	keys := make([]string, 0)
	for key, _ := range eachMap {
		keys = append(keys, key)
	}
	sort.Strings(keys)
	sign := ""
	for _, key := range keys {
		sign = sign + key + gconv.String(eachMap[key])
	}
	return sign, nil
}