package protocol

import (
	"encoding/hex"
	"fmt"
	"github.com/gogf/gf/os/glog"
	"strconv"
)

type Dlt_0x33333533 struct {
	//接收表号
	DeviceAddress []byte
	//表号
	DeviceID string
	//反向有功总电能
	ReactiveEnergy float64
}

func (entity *Dlt_0x33333533) MsgID() MsgID {
	return Msgdlt_0x33333533
}

func (entity *Dlt_0x33333533) Encode(ctx *PacketContext) ([]byte, error) {
	writer := NewWriter()

	// 接收符号
	writer.Write([]byte{0x68})
	writer.Write(entity.DeviceAddress)
	writer.Write([]byte{0x68, 0x11, 0x04, 0x33, 0x33, 0x35, 0x33})

	//cs效验位
	var one byte
	for _, v := range writer.Bytes() {
		one += v
	}
	writer.WriteByte(one)
	// 功能码
	writer.WriteByte(0x16)
	return writer.Bytes(), nil
}

func (entity *Dlt_0x33333533) Decode(ctx *PacketContext, data []byte) (result string, err error) {
	bytea := data[1:7]
	for i, j := 0, len(bytea)-1; i < j; i, j = i+1, j-1 {
		bytea[i], bytea[j] = bytea[j], bytea[i]
	}
	entity.DeviceID = hex.EncodeToString(bytea)
	//正向总电能每个字节-33,1-4,分别为,小数位,个位,百位,万位
	byteb := make([]byte, 4)
	for i := 0; i < 4; i++ {
		byteb[i] = data[14+i] - 0x33
	}

	entity.ReactiveEnergy, err = stringToReactiveEnergy(hex.EncodeToString(byteb))
	if err != nil {
		return "", err
	}
	glog.Debugf("数据读取成功：表号:%s,反向有功总电能:%2f", entity.DeviceID, entity.ReactiveEnergy)

	result = fmt.Sprintf("%s:%2f kWh", "反向有功总电能", entity.ReactiveEnergy)
	return result, nil
}

func stringToReactiveEnergy(s string) (float64, error) {
	a0, _ := strconv.ParseFloat(s[0:2], 64)
	a1, _ := strconv.ParseFloat(s[2:4], 64)
	a2, _ := strconv.ParseFloat(s[4:6], 64)
	a3, _ := strconv.ParseFloat(s[6:8], 64)
	res := a0*0.01 + a1 + a2*100 + a3*10000
	return res, nil
}