package FLXNetworkController

import (
	"bytes"
	"encoding/binary"
	"fmt"
	"io/ioutil"
	"net"
	"strconv"
	"strings"

	log "github.com/sirupsen/logrus"
	"golang.org/x/text/encoding/simplifiedchinese"
	"golang.org/x/text/transform"
)

type FlxNetworkCmdReader struct {
	BufferMaxLength        int //最大缓冲长度
	TCPClientConnect       *net.Conn
	CurrentSocket          *net.TCPConn //TCP连接
	BackUpSocket           *net.TCPConn //备份TCP连接
	RecThreadIsWorking     bool         //是否开始接受
	TCPWorking             bool
	tmpRecDataBuffer       []byte          //缓冲字节
	tmpRecBackUpDataBuffer []byte          //缓冲字节
	InvokeOnReviceData     func(Compacket) //外部委托
	// IfUse              bool
	// TranBuffer         []byte   //
	// TranPosion         int
}

func (para *FlxNetworkCmdReader) InitPara() {

	defer func() {
		if r := recover(); r != nil {
			log.Error("InitPara:", r)
		}
	}()

	/// <summary>缓冲区大小</summary>
	//protected const int BufferMaxLength = 51200;
	para.BufferMaxLength = 4096

	/// <summary>端口数据处理锁</summary>
	//para.CheckLock = new Object();

	// para.TranBuffer = make([]byte, para.BufferMaxLength)
	// para.TranPosion = 0

	// /// <summary>接收到业务数据后触发事件</summary>
	// public event BusinessDataReciveEventHandler OnBusinessDataReciveEventHandler;

	// /// <summary>读端口数据时发生的日志信息</summary>
	// public event DataReciveLogHandler OnDataReciveLogHandler;

	// public event DataReciveHandler OnDataReciveHandler;

	// para.IfUse = false

}

var ClientPort int = 9668

// UDP监听
func (para *FlxNetworkCmdReader) UPDStart() {

	defer func() {
		if r := recover(); r != nil {
			log.Error("UPDStart:", r)
		}
	}()

	// 创建监听
	socket, err := net.ListenUDP("udp4", &net.UDPAddr{
		IP:   net.IPv4(0, 0, 0, 0),
		Port: ClientPort,
	})
	if err != nil {
		fmt.Println("监听失败!", err)
		return
	}
	defer socket.Close()

	for para.RecThreadIsWorking {
		// 读取数据
		data := make([]byte, 4096)
		read, remoteAddr, err := socket.ReadFromUDP(data)
		if err != nil {
			fmt.Println("读取数据失败!", err)
			continue
		}
		fmt.Println("接收到UDP数据：长度为：", read, "--远程IP:", remoteAddr)
		fmt.Printf("%s\n\n", data)
		curIndex := 0
		length := 0
		RecvBuffer := data[:read]
		for curIndex <= len(RecvBuffer)-7 {
			//判断是否出现 7E开头
			if RecvBuffer[curIndex] == FlxNetworkComPara_CMD_HEAD {
				if RecvBuffer[curIndex+3] > 8 {

					curIndex++
					continue
				}
				length = int(RecvBuffer[curIndex+3])*256 + int(RecvBuffer[curIndex+4]) + 7
				if length <= len(RecvBuffer)-curIndex {
					para.UDPValidateRecvBuffer(length, RecvBuffer, curIndex, remoteAddr.IP.String())
					curIndex = curIndex + length

				} else {
					break
				}
			} else {
				curIndex++
			}
		}
	}
}

func (para *FlxNetworkCmdReader) UDPValidateRecvBuffer(packLen int, RecvBuffer []byte, startIndex int, ReIP string) bool {

	defer func() {
		if r := recover(); r != nil {
			log.Error("UDPValidateRecvBuffer:", r)
		}
	}()

	PackBuff := make([]byte, packLen)
	PackBuff = RecvBuffer[startIndex : startIndex+packLen]
	//校验CRC
	CRCBuff := CRCCheck12(PackBuff[:packLen-2])

	if CRCBuff[0] != PackBuff[packLen-2] || CRCBuff[1] != PackBuff[packLen-1] {
		//InvokeOnDataReciveLogHandler(string.Format(FlxNetCCUConstantText.ReciveDataBufferImperfect_Error, "飞利信网口中控机")); //--写日志
		return false
	} else {
		para.InvokeOnReviceData(CreatCMDPack(ReIP, PackBuff))
		// para.InvokeOnReviceData(CreatCMDPack(PackBuff, packLen-2))
		//外发事件。

		return true
	}

}
func (para *FlxNetworkCmdReader) InitCoon(socket *net.TCPConn, backupsocket *net.TCPConn) {

	defer func() {
		if r := recover(); r != nil {
			log.Error("InitCoon:", r)
		}
	}()

	para.CurrentSocket = socket
	para.BackUpSocket = backupsocket
}

// 事件

// protected void InvokeOnDataReciveLogHandler(string logMessage)
// {
// 	if (OnDataReciveLogHandler != null) OnDataReciveLogHandler(logMessage);
// }

// protected void InvokeOnBusinessDataReviceData(ComPacket comPacket)
// {
// 	if (OnBusinessDataReciveEventHandler != null)
// 		OnBusinessDataReciveEventHandler(comPacket);
// }

// 端口数据的处理

// func CreatCMDPack(rcvBuff []byte, length int) Compacket {

// 	var packet Compacket
// 	if length >= 12 {

// 		packet.CmdType = rcvBuff[1]
// 		packet.ChnlID = rcvBuff[2]
// 		packet.Addr = rcvBuff[3]
// 		packet.Cmd = rcvBuff[4]
// 		packet.Const = rcvBuff[5]
// 		packet.ACmdData1 = rcvBuff[6]
// 		packet.ACmdData2 = rcvBuff[7]
// 		packet.ACmdData3 = rcvBuff[8]
// 		packet.ACmdData4 = rcvBuff[9]
// 		//if (true)
// 		//{
// 		//    packet.ChnlID = packet.ACmdData4;
// 		//}
// 		packet.LenH = rcvBuff[10]
// 		packet.LenL = rcvBuff[11]
// 		if length > 12 {
// 			index := 12
// 			packet.Data = make([]byte, length-index)
// 			for i := 0; index < length; index++ {
// 				packet.Data[i] = rcvBuff[index]
// 				i++
// 			}
// 		}
// 		return packet
// 	}
// 	return packet
// }

func CreatCMDPack(reip string, rcvBuff []byte) Compacket {

	defer func() {
		if r := recover(); r != nil {
			log.Error("CreatCMDPack:", r)
		}
	}()

	var packet Compacket
	if len(rcvBuff) < 5 {
		return packet
	}
	reips := strings.Split(reip, ".")

	packet.CmdType = 0x01
	ip2, _ := strconv.Atoi(reips[2])
	packet.ChnlID = byte(ip2)
	ip3, _ := strconv.Atoi(reips[3])
	packet.Addr = byte(ip3)

	packet.IPAddress = reip
	packet.Cmd = rcvBuff[1]
	packet.Const = rcvBuff[2]

	packet.LenH = rcvBuff[3]
	packet.LenL = rcvBuff[4]

	if len(rcvBuff) <= 7 {
		return packet
	}

	packet.Data = make([]byte, packet.LenH*255+packet.LenL)

	packet.Data = rcvBuff[5 : packet.LenH*255+packet.LenL+5]

	return packet

}

func (para *FlxNetworkCmdReader) ProcessRecvBuff(RecvBuffer []byte, ReIP string) {

	defer func() {
		if r := recover(); r != nil {
			log.Error("ProcessRecvBuff:", r)
		}
	}()

	startIndex := 0
	curIndex := 0
	length := 0
	//判断是否大于14字节
	for curIndex <= len(RecvBuffer)-7 {
		//判断是否出现 7E开头
		if RecvBuffer[curIndex] == FlxNetworkComPara_CMD_HEAD {
			if RecvBuffer[curIndex+3] > 8 {

				//System.Windows.Forms.CMessageBox.Show("数据出错！");
				curIndex++
				continue
			}
			length = int(RecvBuffer[curIndex+3])*256 + int(RecvBuffer[curIndex+4]) + 7
			if length <= len(RecvBuffer)-curIndex {
				para.ValidateRecvBuffer(length, RecvBuffer, curIndex, ReIP)
				curIndex = curIndex + length
				startIndex = curIndex
			} else {
				para.tmpRecDataBuffer = append(para.tmpRecDataBuffer, RecvBuffer[curIndex:]...)
				startIndex = -1
			}
		} else {
			curIndex++
		}
	}

	if startIndex >= 0 && startIndex < len(RecvBuffer) {
		para.tmpRecDataBuffer = append(para.tmpRecDataBuffer, RecvBuffer[curIndex:]...)
	}

}

func (para *FlxNetworkCmdReader) ValidateRecvBuffer(packLen int, RecvBuffer []byte, startIndex int, ReIP string) bool {

	defer func() {
		if r := recover(); r != nil {
			log.Error("ValidateRecvBuffer:", r)
		}
	}()

	PackBuff := make([]byte, packLen)
	PackBuff = RecvBuffer[startIndex : startIndex+packLen]
	//校验CRC
	// data := []byte{0x7E, 0x30, 0x11, 0x00, 0x00}
	// CRCBuff := CRCCheck12(data)

	para.InvokeOnReviceData(CreatCMDPack(ReIP, PackBuff))

	//cpcs发的时候没验证 先去掉
	// CRCBuff := CRCCheck12(PackBuff[:packLen-2])
	// if CRCBuff[0] != PackBuff[packLen-2] || CRCBuff[1] != PackBuff[packLen-1] {
	// 	//InvokeOnDataReciveLogHandler(string.Format(FlxNetCCUConstantText.ReciveDataBufferImperfect_Error, "飞利信网口中控机")); //--写日志
	// 	return false
	// } else {

	// 	// para.InvokeOnReviceData(CreatCMDPack(PackBuff, packLen-2))
	// 	//外发事件。

	// 	return true
	// }
	return true
}

// /TCP接收数据
func (para *FlxNetworkCmdReader) TCPCallbackHandler() {

	defer func() {
		if r := recover(); r != nil {
			log.Error("TCPCallbackHandler:", r)
		}
	}()

	//waitReadPackLen := 0 //待读的字节长度
	//length := 0          //放入缓冲区的长度。
	//tmpStr := ""         //日志字符串。
	reciveData := make([]byte, 65535)
	for para.TCPWorking {

		//读取

		waitReadPackLen, err := para.CurrentSocket.Read(reciveData)
		if err != nil {
			fmt.Println("TCP接受出现问题", err)
			para.TCPWorking = false
		}
		if waitReadPackLen == 0 {
			fmt.Println(err)
		}
		// data := make([]byte, waitReadPackLen)

		data := reciveData[:waitReadPackLen]

		// dataLen := binary.LittleEndian.Uint32(data[4:8])
		// data = data[8 : 8+dataLen]

		//当前包接收长度 加上 上次接收半包的长度
		recvBuffer := make([]byte, len(para.tmpRecDataBuffer)+waitReadPackLen) //从端口读取数据的缓冲区
		fmt.Println("接收到TCP数据：长度为：", waitReadPackLen, "--远程IP:", para.CurrentSocket.RemoteAddr())
		//上次如果为半包
		if len(para.tmpRecDataBuffer) > 0 {
			recvBuffer = insertToSlice(0, para.tmpRecDataBuffer, recvBuffer)
		}
		recvBuffer = insertToSlice(len(para.tmpRecDataBuffer), data, recvBuffer)
		para.tmpRecDataBuffer = para.tmpRecDataBuffer[0:0]
		// recvBuffer = append(para.tmpRecDataBuffer, data...)
		//读取当前包的数据
		//Array.Copy(data, 0, recvBuffer, index, waitReadPackLen) //读来的数据先零时放入这个缓冲区

		para.ProcessRecvBuff(recvBuffer, strings.Split(para.CurrentSocket.RemoteAddr().String(), ":")[0])

	}
}

// /TCP接收数据
func (para *FlxNetworkCmdReader) BackUpTCPCallbackHandler() {

	defer func() {
		if r := recover(); r != nil {
			log.Error("BackUpTCPCallbackHandler:", r)
		}
	}()

	//waitReadPackLen := 0 //待读的字节长度
	//length := 0          //放入缓冲区的长度。
	//tmpStr := ""         //日志字符串。
	reciveData := make([]byte, 65535)
	for para.TCPWorking {

		//读取

		waitReadPackLen, err := para.BackUpSocket.Read(reciveData)
		if err != nil {
			fmt.Println("备份TCP接受出现问题", err)
			para.RecThreadIsWorking = false
		}
		if waitReadPackLen == 0 {
			fmt.Println(err)
		}
		data := make([]byte, waitReadPackLen)

		data = reciveData[:waitReadPackLen]
		//当前包接收长度 加上 上次接收半包的长度
		recvBuffer := make([]byte, len(para.tmpRecBackUpDataBuffer)+waitReadPackLen) //从端口读取数据的缓冲区

		//上次如果为半包
		if len(para.tmpRecBackUpDataBuffer) > 0 {
			recvBuffer = insertToSlice(0, para.tmpRecBackUpDataBuffer, recvBuffer)
		}
		recvBuffer = insertToSlice(len(para.tmpRecBackUpDataBuffer), data, recvBuffer)
		para.tmpRecBackUpDataBuffer = para.tmpRecBackUpDataBuffer[0:0]
		// recvBuffer = append(para.tmpRecDataBuffer, data...)
		//读取当前包的数据
		//Array.Copy(data, 0, recvBuffer, index, waitReadPackLen) //读来的数据先零时放入这个缓冲区

		para.BackUpProcessRecvBuff(recvBuffer, strings.Split(para.BackUpSocket.RemoteAddr().String(), ":")[0])

	}
}
func (para *FlxNetworkCmdReader) BackUpProcessRecvBuff(RecvBuffer []byte, ReIP string) {

	defer func() {
		if r := recover(); r != nil {
			log.Error("BackUpProcessRecvBuff:", r)
		}
	}()

	startIndex := 0
	curIndex := 0
	length := 0
	//判断是否大于14字节
	for curIndex <= len(RecvBuffer)-7 {
		//判断是否出现 7E开头
		if RecvBuffer[curIndex] == FlxNetworkComPara_CMD_HEAD {
			if RecvBuffer[curIndex+3] > 8 {

				//System.Windows.Forms.CMessageBox.Show("数据出错！");
				curIndex++
				continue
			}
			length = int(RecvBuffer[curIndex+3])*256 + int(RecvBuffer[curIndex+4]) + 7
			if length <= len(RecvBuffer)-curIndex {
				para.BackUpValidateRecvBuffer(length, RecvBuffer, curIndex, ReIP)
				curIndex = curIndex + length
				startIndex = curIndex
			} else {
				para.tmpRecBackUpDataBuffer = append(para.tmpRecBackUpDataBuffer, RecvBuffer[curIndex:]...)
				startIndex = -1
			}
		} else {
			curIndex++
		}
	}

	if startIndex >= 0 && startIndex < len(RecvBuffer) {
		para.tmpRecBackUpDataBuffer = append(para.tmpRecBackUpDataBuffer, RecvBuffer[curIndex:]...)
	}

}

func (para *FlxNetworkCmdReader) BackUpValidateRecvBuffer(packLen int, RecvBuffer []byte, startIndex int, ReIP string) bool {

	defer func() {
		if r := recover(); r != nil {
			log.Error("BackUpValidateRecvBuffer:", r)
		}
	}()

	PackBuff := make([]byte, packLen)
	PackBuff = RecvBuffer[startIndex : startIndex+packLen]
	//校验CRC
	CRCBuff := CRCCheck12(PackBuff[:packLen-2])

	if CRCBuff[0] != PackBuff[packLen-2] || CRCBuff[1] != PackBuff[packLen-1] {
		//InvokeOnDataReciveLogHandler(string.Format(FlxNetCCUConstantText.ReciveDataBufferImperfect_Error, "飞利信网口中控机")); //--写日志
		return false
	} else {
		// para.InvokeOnReviceData(CreatCMDPack(PackBuff, packLen-2))
		para.InvokeOnReviceData(CreatCMDPack(ReIP, PackBuff))
		//外发事件。

		return true
	}

}

func (para *FlxNetworkCmdReader) Start() bool {

	defer func() {
		if r := recover(); r != nil {
			log.Error("Start:", r)
		}
	}()

	para.RecThreadIsWorking = true
	fmt.Println("数据接收开启")

	go para.UPDStart()
	return true

}
func (para *FlxNetworkCmdReader) StartTCP() bool {

	defer func() {
		if r := recover(); r != nil {
			log.Error("StartTCP:", r)
		}
	}()

	para.TCPWorking = true
	go para.TCPCallbackHandler()
	// go para.BackUpTCPCallbackHandler()
	return true
}

func (para *FlxNetworkCmdReader) StartBackUpTCP() bool {

	defer func() {
		if r := recover(); r != nil {
			log.Error("StartBackUpTCP:", r)
		}
	}()

	para.TCPWorking = true
	go para.BackUpTCPCallbackHandler()
	return true
}
func (para *FlxNetworkCmdReader) StopTCP() bool {

	defer func() {
		if r := recover(); r != nil {
			log.Error("StopTCP:", r)
		}
	}()
	para.TCPWorking = false
	return true

}

func (para *FlxNetworkCmdReader) Stop() bool {

	defer func() {
		if r := recover(); r != nil {
			log.Error("Stop:", r)
		}
	}()

	para.RecThreadIsWorking = false
	return true

}

// insertSlice 插入
func insertSlice(index int, newstr []byte, src []byte) (ns []byte) {
	defer func() {
		if r := recover(); r != nil {
			log.Error("insertSlice:", r)
		}
	}()
	ns = append(ns, src[:index]...) // 切片后加..., 相当于拆包成单个元素
	ns = append(ns, newstr...)
	ns = append(ns, src[index+len(newstr):]...)
	return
}

func insertToSlice(index int, newstr []byte, src []byte) (ns []byte) {
	defer func() {
		if r := recover(); r != nil {
			log.Error("insertToSlice:", r)
		}
	}()
	ns = append(ns, src[:index]...) // 切片后加..., 相当于拆包成单个元素
	ns = append(ns, newstr...)
	ns = append(ns, src[index:]...)
	return
}

// FullCheckSum CRC校验
// @description   CRC校验
// @auth      刘富彦             时间（2020/5/26   10:57 ）
// @param     要检验的数据        []byte          "解释"
// @return    合并后的数据        []byte         "解释"
func FullCheckSum(buf []byte) []byte {

	defer func() {
		if r := recover(); r != nil {
			log.Error("FullCheckSum:", r)
		}
	}()

	buf = buf[:len(buf)-2]
	var checksum uint16
	checksum = 0xffff
	for _, v := range buf {
		n := uint8(uint16(v) ^ checksum)
		//右移运算符（>>）将一个数的各二进制位全部右移若干位，正数左补0，负数左补1，右边丢弃,操作数每右移一位，相当于该数除以2,左补0 or 补1得看被移数是正还是负
		checksum >>= 8
		//异或运算 0^0=0；  0^1=1；  1^0=1；   1^1=0；
		checksum ^= MbTable[n]
	}

	int16buf := new(bytes.Buffer)

	binary.Write(int16buf, binary.LittleEndian, checksum)
	return append(buf, int16buf.Bytes()...)

}

func CRCCheck12(buf []byte) []byte {

	defer func() {
		if r := recover(); r != nil {
			log.Error("CRCCheck12:", r)
		}
	}()

	var checksum uint16
	checksum = 0xffff
	for _, v := range buf {
		n := uint8(uint16(v) ^ checksum)
		checksum >>= 8
		checksum ^= MbTable[n]
	}

	int16buf := new(bytes.Buffer)

	binary.Write(int16buf, binary.LittleEndian, checksum)
	return int16buf.Bytes()
}

var MbTable = []uint16{
	0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
	0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
	0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
	0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
	0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
	0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
	0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
	0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
	0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
	0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
	0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
	0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
	0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
	0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
	0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
	0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
	0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
	0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
	0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
	0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
	0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
	0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
	0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
	0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
	0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
	0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
	0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
	0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
	0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
	0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
	0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
	0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x8080}

/// 初始化
/// <summary>发送设备切换成主命令</summary>

/// <summary>发送设备查询命令，由阅读类接收状态信息</summary>
//public virtual void ScanDevices()
//{
//    var ary = make([]byte,12) ;
//
//    ary[index++] = FLXNetCCUCompara_CMD_HEAD;
//    ary[index++] = FLXNetCCUCompara_CMD_TYPE01;
//    ary[index++] = CMD_CHANEL;
//    ary[index++] = FLXNetCCUCompara_CMD_BROAD;
//    ary[index++] = Data_Device_Query; //cmd

// gb2312 能识别更多汉字， 担心utf8不能转换签到门硬件里面出来的汉字，因此转gb2312
func UTF8GBK(s []byte) ([]byte, error) {

	defer func() {
		if r := recover(); r != nil {
			log.Error("UTF8GBK:", r)
		}
	}()

	reader := transform.NewReader(bytes.NewReader(s), simplifiedchinese.GBK.NewEncoder())
	d, e := ioutil.ReadAll(reader)
	if e != nil {
		return nil, e
	}
	return d, nil

}