package jdlclient

import (
	"bytes"
	"crypto/hmac"
	"crypto/md5"
	"crypto/sha1"
	"crypto/sha256"
	"crypto/sha512"
	"encoding/base64"
	"fmt"
	"io/ioutil"
	"net/http"
	"strings"
	"sync"
	"time"
	"xiaoniaokuaiyan.com/xiaoniao/config"
)

/**
* @Author: qz
* @Date: 2022/6/14 13:35
* @Description:
 */
type client struct {
	appSecret    string
	accessToken  string
	appKey       string
	algorithm    string
	baseUri      string
	domain       string
	CustomerCode string //月结号
}

var jinstance *client
var jonce sync.Once

func createJDL() {
	var (
		dsec      = config.IniConf.Section("jdl")
		appkey    = dsec.Key("app_key").Value()
		appsecret = dsec.Key("app_secret").Value()
		apptoken  = dsec.Key("access_token").Value()
		baseuri   = dsec.Key("base_uri").Value()
		code      = dsec.Key("code").Value()
	)
	//var (
	//	appkey    = "4159281e504c405c8e463f3e25641ef1"
	//	appsecret = "3f4088de32c8466889c63ab66f97f027"
	//	apptoken  = "6efe97697e0d46cd8f4522537ef2d10f"
	//	baseuri   = "https://api.jdl.com"
	//)

	jinstance = &client{
		appSecret:    appsecret,
		accessToken:  apptoken,
		appKey:       appkey,
		algorithm:    "md5-salt",
		baseUri:      baseuri,
		domain:       "express",
		CustomerCode: code,
	}
}

func GetJDLClient() *client {
	jonce.Do(func() {
		createJDL()
		config.RegistChangeCallback(createJDL)
	})
	return jinstance
}

func (c *client) DoRequest(req JdLRequest) ([]byte, error) {
	hc := http.Client{}
	timestamp := time.Now().Format("2006-01-02 15:04:05")
	content := strings.Join([]string{
		c.appSecret,
		"access_token", c.accessToken,
		"app_key", c.appKey,
		"method", req.GetPath(),
		"param_json", req.GetBody(),
		"timestamp", timestamp,
		"v", "2.0",
		c.appSecret,
	}, "")
	sign, err := Sign(c.algorithm, []byte(content), c.appSecret)
	if err != nil {
		panic(err)
	}

	uri := c.baseUri + req.GetPath()
	httpRequest, err := http.NewRequest("POST", uri, bytes.NewReader([]byte(req.GetBody())))
	if err != nil {
		panic(err)
	}

	query := httpRequest.URL.Query()
	query.Add("LOP-DN", c.domain)
	query.Add("app_key", c.appKey)
	query.Add("access_token", c.accessToken)
	query.Add("timestamp", timestamp)
	query.Add("v", "2.0")
	query.Add("sign", sign)
	query.Add("algorithm", c.algorithm)
	httpRequest.URL.RawQuery = query.Encode()

	_, offset := time.Now().Zone()
	httpRequest.Header.Add("lop-tz", fmt.Sprintf("%d", offset/3600))
	httpRequest.Header.Add("User-Agent", "lop-http/go")

	httpResponse, err := hc.Do(httpRequest)
	if err != nil {
		//panic(err)
		return nil, err
	}

	b, err := ioutil.ReadAll(httpResponse.Body)
	if err != nil {
		//panic(b)
		return nil, err
	}
	//println(httpResponse.Status)
	//for k, v := range httpResponse.Header {
	//	fmt.Printf("%s: %s\n", k, strings.Join(v, ", "))
	//}
	println(string(b))
	return b, nil
}

func Sign(algorithm string, data []byte, secret string) (string, error) {
	if algorithm == "md5-salt" {
		h := md5.New()
		if _, err := h.Write(data); err != nil {
			return "", err
		}
		return fmt.Sprintf("%x", h.Sum(nil)), nil
	} else if algorithm == "HMacMD5" {
		h := hmac.New(md5.New, []byte(secret))
		if _, err := h.Write(data); err != nil {
			return "", err
		}
		return base64.StdEncoding.EncodeToString(h.Sum(nil)), nil
	} else if algorithm == "HMacSHA1" {
		h := hmac.New(sha1.New, []byte(secret))
		if _, err := h.Write(data); err != nil {
			return "", err
		}
		return base64.StdEncoding.EncodeToString(h.Sum(nil)), nil
	} else if algorithm == "HMacSHA256" {
		h := hmac.New(sha256.New, []byte(secret))
		if _, err := h.Write(data); err != nil {
			return "", err
		}
		return base64.StdEncoding.EncodeToString(h.Sum(nil)), nil
	} else if algorithm == "HMacSHA512" {
		h := hmac.New(sha512.New, []byte(secret))
		if _, err := h.Write(data); err != nil {
			return "", err
		}
		return base64.StdEncoding.EncodeToString(h.Sum(nil)), nil
	}
	return "", fmt.Errorf("algorithm %s not supported yet", algorithm)
}