package thirdparty

import (
	"bytes"
	"encoding/base64"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"gd_vehicle/common.in/utils"
	"go.uber.org/zap"

	"gd_vehicle/common.in/config"

	id2 "gd_vehicle/common.in/id"
	//"github.com/tidwall/gjson"
	"io/ioutil"
	"net/http"
	"time"

	"github.com/tjfoc/gmsm/sm4"
)

// PKCSPadd填充算法
func PKCS7Padding(ciphertext []byte, blockSize int) []byte {
	padding := blockSize - len(ciphertext)%blockSize
	padText := bytes.Repeat([]byte{byte(padding)}, padding)
	return append(ciphertext, padText...)
}

func PKCS7UnPadding(origData []byte) []byte {
	length := len(origData)
	unPadding := int(origData[length-1])
	return origData[:(length - unPadding)]
}

func SM4ECBBase64Encrypt(originalText string, key []byte) (string, error) {
	block, err := sm4.NewCipher(key)
	if err != nil {
		panic(err)
	}
	originalBytes := []byte(originalText)
	originalBytes = PKCS7Padding(originalBytes, block.BlockSize())

	cipherArr := make([]byte, 0)
	cArr := make([]byte, 16)

	j := 0
	for i := 0; i < len(originalBytes)/16; i++ {
		original := originalBytes[j : j+16]
		block.Encrypt(cArr, original)
		cipherArr = append(cipherArr, cArr...)
		j = j + 16
	}

	base64Str := base64.StdEncoding.EncodeToString(cipherArr)
	return base64Str, nil

}

func SM4ECBBase64Decrypt(cipherText string) (string, error) {
	key, _ := hex.DecodeString(config.Conf.ThirdPart.CdbdSecret)
	cInArr, _ := base64.StdEncoding.DecodeString(cipherText)
	block, err := sm4.NewCipher(key)
	if err != nil {
		panic(err)
	}

	cipherArr := make([]byte, 0)
	cArr := make([]byte, 16)

	j := 0
	for i := 0; i < len(cInArr)/16; i++ {
		original := cInArr[j : j+16]
		block.Decrypt(cArr, original)
		cipherArr = append(cipherArr, cArr...)
		j = j + 16
	}

	originalText := string(PKCS7UnPadding(cipherArr))
	return originalText, nil

}

func CdBdClientPost(api, code string, data map[string]string, httpTimeout int) (result []byte, err error) {
	defer func() {
		l.Info("thirdparty",
			zap.String("api", api),
			zap.String("request", utils.MarshalJsonString(data)),
			zap.String("response", utils.MarshalJsonString(result)))
	}()
	if httpTimeout == 0 {
		httpTimeout = 30
	}

	key, _ := hex.DecodeString(config.Conf.ThirdPart.CdbdSecret)
	client := &http.Client{}

	client.Timeout = time.Duration(httpTimeout) * time.Second
	authorization, _ := id2.GetDistributedUniqueID()
	data["authorization"] = fmt.Sprintf("%d", authorization)
	//fmt.Println("data:", data)

	param := map[string]string{}
	rdata, _ := json.Marshal(data)
	//fmt.Println("rdata :", string(rdata), data)
	tmp, err := SM4ECBBase64Encrypt(string(rdata), key)
	if err != nil {
		fmt.Println("encoding failed :", tmp, err)
	}
	param["param"] = tmp
	requestData, _ := json.Marshal(param)
	//fmt.Println("request data :", string(requestData))
	req, err := http.NewRequest("POST", api, bytes.NewBuffer(requestData))
	if err != nil {
		return nil, err
	}

	timestamp := time.Now().UnixNano() / 1e6
	id, _ := id2.GetDistributedUniqueID()
	header := map[string]string{}
	header["random"] = fmt.Sprintf("%d", id)
	header["timestamp"] = fmt.Sprintf("%d", timestamp)
	header["clientId"] = config.Conf.ThirdPart.CdbdClientId //"f830bebbec534450b22d2e766cb4cc36"
	header["code"] = code                                   //"DPA12Y003R02310231-DSA12CDS0231"
	siginStr := ""
	for k, v := range header {
		tmp := k + "=" + v
		if siginStr == "" {
			siginStr = tmp
		} else {
			siginStr = siginStr + "&" + tmp
		}
	}

	sigin, _ := SM4ECBBase64Encrypt(siginStr, key)
	header["signature"] = sigin

	//fmt.Println("header :", header, siginStr)
	for k, v := range header {
		req.Header.Set(k, v)
	}
	req.Header.Set("Content-Type", "application/json")

	resp, err := client.Do(req)
	if err != nil {
		return nil, err
	}

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("wrong status code: %d", resp.StatusCode)
	}
	defer resp.Body.Close()

	result, err = ioutil.ReadAll(resp.Body)
	return
}