/*
 * url functions
 */
package network

import (
	"crypto/md5"
	"encoding/hex"
	"errors"
	"io/ioutil"
	"net"
	"net/http"
	"net/url"
	"strconv"
	"strings"
	"time"

	"git.tetele.net/tgo/crypter"
)

/**
 * post 请求
 */
func FnPost(url, param string) ([]byte, error) {
	httpClient := &http.Client{}

	req, err := http.NewRequest("POST", url, strings.NewReader(param))
	if err != nil {
		return []byte(""), err
	}

	req.Header.Set("Content-Type", "application/x-www-form-urlencoded") //"application/x-www-form-urlencoded"

	resp, err := httpClient.Do(req)
	if err != nil {
		return []byte(""), err
	}

	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return []byte(""), err
	}

	return body, nil
}

/**
 * 取本地IP
 */
func GetLocalIp() string {

	addrs, err := net.InterfaceAddrs()

	if err != nil {
		return ""
	}

	for _, address := range addrs {

		// 检查ip地址判断是否回环地址
		if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
			if ipnet.IP.To4() != nil && !ipnet.IP.IsLinkLocalUnicast() {
				return ipnet.IP.String()
			}
		}
	}

	return ""
}

/**
 * 生成一个token
 */
func CreateTokenWithTime(sToken string) string {
	now := time.Now()
	iNow := now.Format("20060102150405")
	sToken += iNow
	h := md5.New()
	h.Write([]byte(sToken)) // 需要加密的字符串
	cipher2Str := h.Sum(nil)
	return hex.EncodeToString(cipher2Str) // 输出加密结果
}

/**
 * 生成一个token
 */
// func CreateToken(sToken string) string {
// 	now := time.Now()
// 	iNow := now.Format("20060102150405")
// 	sToken += iNow
// 	h := md5.New()
// 	h.Write([]byte(sToken)) // 需要加密的字符串
// 	cipher2Str := h.Sum(nil)
// 	sMd5 := hex.EncodeToString(cipher2Str) // 输出加密结果

// 	tokenEn := crypter.DesEn(sToken, "gzyc8642")
// 	return sMd5 + "|" + ToString(now.Unix()) + "|" + tokenEn
// }

/**
 * 验证token
 */
func CheckToken(token string) (bool, string) {
	arr := strings.Split(token, "|")
	if len(arr) != 3 {
		return false, ""
	}
	tokenDes := crypter.DesDe(arr[2], "gzyc8642")

	tokenTime := tokenDes[len(tokenDes)-14:]

	timeInt, err := strconv.ParseInt(arr[1], 10, 64)
	if err != nil {
		return false, ""
	}
	currentTime := time.Unix(timeInt, 0).Format("20060102150405")

	if currentTime != tokenTime {
		return false, ""
	}

	h := md5.New()
	h.Write([]byte(tokenDes)) // 需要加密的字符串
	cipher2Str := h.Sum(nil)
	sMd5 := hex.EncodeToString(cipher2Str) // 输出加密结果

	if sMd5 == arr[0] {
		return true, tokenDes[0 : len(tokenDes)-14]
	}
	return false, ""
}

/**
 * 给参数签名
 */
func QuerySign(mQuery map[string]string) string {
	sParam := ""
	for k, v := range mQuery {
		sParam += k + "=" + v + "&"
	}
	query, Err := url.ParseQuery(sParam)
	if Err != nil {
		return ""
	} else {
		return crypter.Md5Password(query.Encode(), "guzeng1")
	}
}

/**
 * 从url中取域名，端口
 * 2019/05/20
 */
func GetIpPortFromUrl(sUrl string) (string, string, error) {
	if sUrl == "" {
		return "", "", errors.New("param error")
	}
	if !strings.Contains(sUrl, "http://") && !strings.Contains(sUrl, "https://") {
		sUrl = "http://" + sUrl
	}
	u, err := url.Parse(sUrl)
	if err != nil {
		return "", "", err
	}
	return u.Hostname(), u.Port(), nil
}