package utils

import "C"
import (
	"case-open-api/config"
	"encoding/json"
	"errors"
	"fmt"
	"strconv"
	"time"
)

// GenSignature 生成签名
func GenSignature(paramsMap map[string]interface{}, timestamp string, secret string) (string, error) {
	// 对map的key进行排序，包括多层嵌套的情况
	paramsData := SortMapParams(paramsMap)
	paramsData["timestamp"] = timestamp

	// 转换为JSON
	jsonData, err := json.Marshal(paramsData)
	if err != nil {
		return "", err
	}

	sign := HmacSHA256(string(jsonData), secret)

	return sign, err
}

// VerifySignature 验证签名
func VerifySignature(paramsMap map[string]interface{}, receivedTimestamp, receivedSignature, secret string) error {
	// 验证时间戳是否超出 5 分钟-测试环境不验证
	if config.C.Env != "dev" {
		currentTime := time.Now().Unix() * 1000

		timestamp, err := strconv.ParseInt(receivedTimestamp, 10, 64)

		if err != nil {
			return errors.New("签名错误")
		}

		if currentTime-timestamp > 5000 {
			return errors.New("签名超时")
		}
	}

	// 生成签名
	sign, err := GenSignature(paramsMap, receivedTimestamp, secret)
	fmt.Println(sign)
	if err != nil {
		return errors.New("内部错误")
	}

	if receivedSignature != sign {
		return errors.New("签名错误")
	}

	return nil
}