package mijia_go_sdk

import (
	"crypto/hmac"
	"crypto/md5"
	"crypto/rand"
	"crypto/sha256"
	"encoding/base64"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"strings"
)

// 生成随机设备ID
func generateRandomDeviceId(size int) string {
	tempStr := "1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
	deviceId := make([]byte, size)
	_, err := rand.Read(deviceId)
	if err != nil {
		panic(err)
	}

	for i := range deviceId {
		deviceId[i] = tempStr[deviceId[i]%byte(len(tempStr))]
	}
	return string(deviceId)
}

func mapToStruct(data map[string]interface{}) (Authorize, error) {
	jsonStr, err := json.Marshal(data)
	if err != nil {
		return Authorize{}, err
	}

	var myStruct Authorize
	err = json.Unmarshal(jsonStr, &myStruct)
	if err != nil {
		return Authorize{}, err
	}

	return myStruct, nil
}

func SetReqHeader(req *http.Request) {
	req.Header.Set("User-Agent", "APP/com.xiaomi.mihome APPV/6.0.103 iosPassportSDK/3.9.0 iOS/14.4 miHSTS")
}

func Login(user, pwd string) (Authorize, error) {
	msgURL := fmt.Sprintf("https://account.xiaomi.com/pass/serviceLogin?sid=xiaomiio&_json=true")
	loginURL := "https://account.xiaomi.com/pass/serviceLoginAuth2"
	deviceID := generateRandomDeviceId(16)
	authorize := make(map[string]interface{})
	client := &http.Client{}
	req, _ := http.NewRequest("GET", msgURL, nil)
	SetReqHeader(req)
	req.Header.Set("Accept", "*/*")
	req.Header.Set("Accept-Language", "zh-tw")
	req.Header.Set("Cookie", fmt.Sprintf("deviceId=%s; sdkVersion=3.4.1", deviceID))
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	bodyBytes, _ := io.ReadAll(resp.Body)
	var result map[string]interface{}
	json.Unmarshal(bodyBytes[11:], &result)
	body := url.Values{}
	body.Set("qs", result["qs"].(string))
	body.Set("sid", result["sid"].(string))
	body.Set("_sign", result["_sign"].(string))
	body.Set("callback", result["callback"].(string))
	body.Set("user", user)
	pwdHash := md5.Sum([]byte(pwd))
	pwdHashStr := strings.ToUpper(hex.EncodeToString(pwdHash[:]))
	body.Set("hash", pwdHashStr)
	body.Set("_json", "true")
	loginReq, _ := http.NewRequest("POST", loginURL, strings.NewReader(body.Encode()))
	loginReq.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	loginResp, _ := client.Do(loginReq)
	defer loginResp.Body.Close()
	loginBodyBytes, _ := io.ReadAll(loginResp.Body)
	json.Unmarshal(loginBodyBytes[11:], &result)
	if result["code"].(float64) != 0 {
		authorize["code"] = result["code"]
		authorize["message"] = result["desc"]
		//return authorize
	}
	redirectURL := result["location"].(string)
	redirectReq, _ := http.NewRequest("GET", redirectURL, nil)
	redirectResp, _ := client.Do(redirectReq)
	defer redirectResp.Body.Close()
	cookies := redirectResp.Header["Set-Cookie"]
	for _, cookie := range cookies {
		cookieParts := strings.Split(strings.Split(cookie, "; ")[0], "=")
		authorize[cookieParts[0]] = cookieParts[1]
	}
	authorize["code"] = 0
	authorize["sid"] = "xiaomiio"
	authorize["userId"] = result["userId"]
	authorize["securityToken"] = result["ssecurity"]
	authorize["deviceId"] = deviceID
	authorize["message"] = "成功"
	return mapToStruct(authorize)
}

func generateSignedNonce(secret, nonce string) string {
	hash := sha256.New()
	decodeString, _ := base64.StdEncoding.DecodeString(secret)
	hash.Write(decodeString)
	V, _ := base64.StdEncoding.DecodeString(nonce)
	hash.Write(V)
	return base64.StdEncoding.EncodeToString(hash.Sum(nil))
}

func generateSignature(uri, signedNonce, nonce, data string) string {
	sign := uri + "&" + signedNonce + "&" + nonce + "&data=" + data
	decodeString, _ := base64.StdEncoding.DecodeString(signedNonce)
	mac := hmac.New(sha256.New, decodeString)
	mac.Write([]byte(sign))
	return base64.StdEncoding.EncodeToString(mac.Sum(nil))
}

func mapToJSON(data map[string]interface{}) (string, error) {
	jsonBytes, err := json.Marshal(data)
	if err != nil {
		return "", err
	}
	return string(jsonBytes), nil
}

func PostData(uri string, data map[string]interface{}, Certificate Authorize) []byte {

	Certificate.UserId = 2251648609
	Certificate.ServiceToken = "x2K8nowPRvFEaeEKt2aj35xTgEZLTspxURrRIbbETcLJ5WLNdzxFrI1DfI3M3+/tvxJyfQMdaYu+8EfedWgSfB81T0P8R5zofX6GUd/jE2KlslBLyzn3vabqhHIL93ahoPUog1Q8pKBJJTRqOrL2pypDy1ODWkQ07jUC6fWqf+k="
	Certificate.Code = 0
	Certificate.Sid = "xiaomiio"
	Certificate.SecurityToken = "btZAHcCqLvQZp0eot8IlOQ=="
	Certificate.DeviceId = "3P5v99CdV4vwkpsS"

	dataStr, err := mapToJSON(data)
	if err != nil {
		return nil
	}

	nonce := generateRandomDeviceId(16)
	nonce = "H9qOd9J9wRRMTXj0"
	signedNonce := generateSignedNonce(Certificate.SecurityToken, nonce)
	signature := generateSignature(uri, signedNonce, nonce, dataStr)

	body := url.Values{}
	body.Set("_nonce", nonce)
	body.Set("data", dataStr)
	body.Set("signature", signature)

	client := &http.Client{}
	req, _ := http.NewRequest("POST", "https://api.io.mi.com/app"+uri, strings.NewReader(body.Encode()))
	SetReqHeader(req)
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	req.Header.Set("x-xiaomi-protocal-flag-cli", "PROTOCAL-HTTP2")
	req.Header.Set("Cookie", fmt.Sprintf("PassportDeviceId=%s;userId=%v;serviceToken=%s;", Certificate.DeviceId, Certificate.UserId, Certificate.ServiceToken))
	resp, err := client.Do(req)
	if err != nil {
		fmt.Println("Error:", err)
	}
	defer resp.Body.Close()

	respBody, _ := io.ReadAll(resp.Body)
	return respBody
}