package main

import (
	"encoding/binary"
	"encoding/json"
	"fmt"
	"github.com/gin-gonic/gin"
	modbus "github.com/thinkgos/gomodbus"
	"github.com/thinkgos/gomodbus/mb"
	"net/http"
	"strconv"
	"strings"
	"time"
)

type MbParam struct{
	Addr byte 			`json:"Addr"`
	RegAddr uint16		`json:"RegAddr"`
	RegCnt uint16		`json:"RegCnt"`
	Data string         `json:"Data"`
}

var client       *mb.Client
var mbParam      MbParam


func NewMbParam(addr byte,regAddr,regCnt uint16)*MbParam{
	return &MbParam{
		Addr   :addr,
		RegAddr:regAddr,
		RegCnt :regCnt,
	}
}

func mbParamOpenPort(port string) bool{
	status := false

	//调用RTUClientProvider的构造函数,返回结构体指针
	p := modbus.NewRTUClientProvider()
	p.Address = port
	p.BaudRate = 115200
	p.DataBits = 8
	p.Parity = "N"
	p.StopBits = 1
	p.Timeout = 100 * time.Millisecond

	client = mb.NewClient(p)
	client.LogMode(true)
	err := client.Start()
	if err != nil {
		fmt.Println("start err,", err)
		return status
	}

	status = true
	return status
}

func mbParamReadHoldReg(slaveAddr byte,regAddr uint16,regCnt uint16)[]uint16{
	value, err := client.ReadHoldingRegisters(slaveAddr, regAddr, regCnt)
	if err != nil {
		fmt.Println("readHoldErr,", err)
	} else {
		//fmt.Printf("%#v\n", value)
	}

	return value
}


func mbParamWriteMutilReg(slaveAddr byte,regAddr uint16,regCnt uint16,data []byte) error{
	err := client.WriteMultipleRegisters(slaveAddr,regAddr,regCnt,data)
	if err != nil {
		fmt.Println("writeMulRegErr,", err)
	}

	return err
}

func apiReadHoldReg(context *gin.Context){

	aParam := struct{
		Code string			`json:"Code"`
		Message string		`json:"Message"`
		Data string			`json:"Data"`
	}{
		Code:"1",
		Message:"",
		Data:"",
	}

	bodyBuf := make([]byte,1024)
	n,_ := context.Request.Body.Read(bodyBuf)

	fmt.Println(string(bodyBuf[:n]))

	//获取读寄存器的参数
	rMbParam := &MbParam{}
	err := json.Unmarshal(bodyBuf[:n],rMbParam)
	if err != nil {
		fmt.Println("rMbParam json unMarshall err,",err)

		aParam.Code = "1"
		aParam.Message = "json unMarshall err"

		sJson,_ := json.Marshal(aParam)

		context.String(http.StatusOK,string(sJson))
		return
	}

	mRegValue := mbParamReadHoldReg(rMbParam.Addr,rMbParam.RegAddr,rMbParam.RegCnt)
	fmt.Printf("mRegValue %#v\n",mRegValue)
	var sRegValue string = ""

	for i:=0;i<len(mRegValue);i++{
		sRegValue += strconv.FormatUint(uint64(mRegValue[i]),10)

		if i != (len(mRegValue)-1) {
			sRegValue = sRegValue + ","
		}else{
			sRegValue = sRegValue + ""
		}
	}
	fmt.Println(sRegValue)


	aParam.Code = "0"
	aParam.Message = ""

	aParam.Data = sRegValue
	sJson,_ := json.Marshal(aParam)

	context.String(http.StatusOK,string(sJson))
}

func apiWriteMultiReg(context *gin.Context){

	aParam := struct{
		Code string			`json:"Code"`
		Message string		`json:"Message"`
		Data string			`json:"Data"`
	}{
		Code:"1",
		Message:"",
		Data:"",
	}

	bodyBuf := make([]byte,1024)
	n,_ := context.Request.Body.Read(bodyBuf)

	fmt.Println(string(bodyBuf[:n]))

	//获取写寄存器的参数
	rMbParam := &MbParam{}
	err := json.Unmarshal(bodyBuf[:n],rMbParam)
	if err != nil {
		fmt.Println("rMbParam json unMarshall err,",err)

		aParam.Code = "1"
		aParam.Message = "json unMarshall err"
		sJson,_ := json.Marshal(aParam)

		context.String(http.StatusOK,string(sJson))
		return
	}

	//将字符串中数值取出来
	sData := strings.Split(rMbParam.Data,",")
	//fmt.Println(sData)
	bData := make([]byte,0)
	bData2 := make([]byte,2)
	for _,v:= range sData{
		//tByte,err := strconv.ParseUint(v,10,16)
		tByte,_:= strconv.Atoi(v)
		binary.BigEndian.PutUint16(bData2,uint16(tByte))

		bData = append(bData,bData2...)
	}
	fmt.Printf("bData is %d\n",bData)

	err = mbParamWriteMutilReg(rMbParam.Addr,rMbParam.RegAddr,
		rMbParam.RegCnt,bData)
	if err != nil{
		aParam.Code = "1"
		aParam.Message = "write reg timeout"
		sJson,_ := json.Marshal(aParam)

		context.String(http.StatusOK,string(sJson))

	}
	aParam.Code = "0"
	aParam.Message = ""
	sJson,_ := json.Marshal(aParam)

	context.String(http.StatusOK,string(sJson))
}