// Package beijing11 北京11号线联锁通信
package beijing11

import (
	"fmt"
	"joylink.club/bj-rtsts-server/config"
	"joylink.club/bj-rtsts-server/third_party/udp"
	"log/slog"
	"sync"
)

var (
	initMutex    = sync.Mutex{}
	interlockMap = make(map[string]*InterlockProxy)
	logTag       = "[北京11号线联锁通信]"
)

func GetInstant(c *config.InterlockConfig, msgManager MsgManager) *InterlockProxy {
	initMutex.Lock()
	defer initMutex.Unlock()
	if interlockMap[c.Code] == nil {
		interlockMap[c.Code] = &InterlockProxy{runConfig: c, msgManager: msgManager}
	}
	return interlockMap[c.Code]
}

type MsgManager interface {
	HandleReadRegisterMsg(req *ReadRegisterReq) (*ReadRegisterRes, error)
	HandleWriteRegisterMsg(req *WriteRegisterReq) error
	HandleDownstreamMsg(data []byte) error
	CollectUpstreamMsg() []byte
}

type msgManager struct {
}

type InterlockProxy struct {
	runConfig  *config.InterlockConfig //联锁通信配置
	msgManager MsgManager              //消息获取与处理接口0
	client     udp.UdpClient           //向上位机发送数据的UDP客户端
	server     udp.UdpServer           //接收上位机数据的UDP服务端
	running    bool                    //此服务正在运行的标志
}

func (i *InterlockProxy) Start() {
	if i.runConfig == nil || i.runConfig.Ip == "" || !i.runConfig.Open {
		return
	}
	if i.running {
		panic("启动联锁消息服务错误: 存在正在运行的任务")
	}
	//UDP通信设施
	i.server = udp.NewServer(fmt.Sprintf(":%d", i.runConfig.LocalPort), i.handleUpperData)
	err := i.server.Listen()
	if err != nil {
		panic("启动联锁消息服务错误：无法启动UDP服务")
	}
	i.running = true
	i.client = udp.NewClient(fmt.Sprintf("%v:%v", i.runConfig.Ip, i.runConfig.RemotePort))
}

// 处理来自上位机的数据
func (i *InterlockProxy) handleUpperData(data []byte) {
	baseData := &BaseStruct{}
	err := baseData.Decode(data)
	if err != nil {
		slog.Error(logTag + "数据解析出错：" + err.Error())
		return
	}
	switch baseData.ControlWord {
	case ControlWord.ReadRegister:
		req := &ReadRegisterReq{}
		err := req.Decode(baseData.Data)
		if err != nil {
			slog.Error(logTag + "读寄存器数据解析出错：" + err.Error())
			return
		}
		res, err := i.msgManager.HandleReadRegisterMsg(req)
		if err != nil {
			slog.Error(logTag + "读寄存器数据处理出错：" + err.Error())
			return
		}
		resData := &BaseStruct{
			ID:          baseData.ID,
			ControlWord: ControlWord.Response,
			Data:        res.Encode(),
		}
		i.SendToUpper(resData.Encode())
	case ControlWord.WriteRegister:
		req := &WriteRegisterReq{}
		err := req.Decode(baseData.Data)
		if err != nil {
			slog.Error(logTag + "写寄存器数据解析出错：" + err.Error())
			return
		}
		err = i.msgManager.HandleWriteRegisterMsg(req)
		if err != nil {
			slog.Error(logTag + "写寄存器数据处理出错：" + err.Error())
			return
		}
	case ControlWord.DownStream:
		err = i.msgManager.HandleDownstreamMsg(baseData.Data)
		if err != nil {
			slog.Error(logTag + "下行数据处理出错：" + err.Error())
			return
		}
	}
}

func (i *InterlockProxy) SendToUpper(data []byte) {
	err := i.client.Send(data)
	slog.Error(logTag + "向上位机发送数据失败：" + err.Error())
}

func (i *InterlockProxy) Stop() {
	initMutex.Lock()
	defer initMutex.Unlock()
	delete(interlockMap, i.runConfig.Code)
	if i.client != nil {
		i.client.Close()
	}
	if i.server != nil {
		i.server.Close()
	}
	i.running = false
}