package gateway

import (
	"context"
	"fmt"
	"go_dreamfactory/comm"
	"go_dreamfactory/pb"
	"sync"
	"sync/atomic"

	"go_dreamfactory/lego/sys/log"
	"go_dreamfactory/lego/utils/container/id"

	"github.com/gorilla/websocket"
	"google.golang.org/protobuf/proto"
)

/*
用户代理对象
封装用户socket 对象 处理用户的消息读取 写入 关闭等操作
*/

func newAgent(gateway IGateway, conn *websocket.Conn) *Agent {
	agent := &Agent{
		gateway:     gateway,
		wsConn:      conn,
		sessionId:   id.NewUUId(),
		uId:         "",
		writeChan:   make(chan *pb.UserMessage, 2),
		closeSignal: make(chan bool),
		state:       1,
	}
	agent.wg.Add(2)
	go agent.readLoop()
	go agent.writeLoop()
	return agent
}

//用户代理
type Agent struct {
	gateway     IGateway
	wsConn      *websocket.Conn
	sessionId   string
	uId         string
	writeChan   chan *pb.UserMessage
	closeSignal chan bool
	state       int32 //状态 0 关闭 1 运行 2 关闭中
	wg          sync.WaitGroup
}

func (this *Agent) readLoop() {
	defer this.wg.Done()
	var (
		data []byte
		msg  *pb.UserMessage = &pb.UserMessage{}
		err  error
	)
locp:
	for {
		if _, data, err = this.wsConn.ReadMessage(); err != nil {
			log.Errorf("agent:%s uId:%s ReadMessage err:%v", this.sessionId, this.uId, err)
			go this.Close()
			break locp
		}

		if err = proto.Unmarshal(data, msg); err != nil {
			log.Errorf("agent:%s uId:%s Unmarshal err:%v", this.sessionId, this.uId, err)
			go this.Close()
			break locp
		} else {
			this.messageDistribution(msg)
		}
	}
	log.Debugf("agent:%s uId:%s readLoop end!", this.sessionId, this.uId)
}

func (this *Agent) writeLoop() {
	defer this.wg.Done()
	var (
		data []byte
		err  error
	)
locp:
	for {
		select {
		case <-this.closeSignal:
			break locp
		case msg, ok := <-this.writeChan:
			if ok {
				data, err = proto.Marshal(msg)
				if err = this.wsConn.WriteMessage(websocket.BinaryMessage, data); err != nil {
					log.Errorf("agent:%s uId:%d WriteMessage err:%v", this.sessionId, this.uId, err)
					go this.Close()
				}
			} else {
				go this.Close()
			}
		}
	}
	log.Debugf("agent:%s uId:%s writeLoop end!", this.sessionId, this.uId)
}

func (this *Agent) SessionId() string {
	return this.sessionId
}

func (this *Agent) IP() string {
	return this.wsConn.RemoteAddr().String()
}
func (this *Agent) UserId() string {
	return this.uId
}

func (this *Agent) Build(uId string) {
	this.uId = uId
}

func (this *Agent) UnBuild() {
	this.uId = ""
}

func (this *Agent) WriteMsg(msg *pb.UserMessage) (err error) {
	if atomic.LoadInt32(&this.state) != 1 {
		return
	}
	this.writeChan <- msg
	return
}

//外部代用关闭
func (this *Agent) Close() {
	if !atomic.CompareAndSwapInt32(&this.state, 1, 2) {
		return
	}
	this.wsConn.Close()
	this.closeSignal <- true
	this.wg.Wait()
	atomic.StoreInt32(&this.state, 0)
	this.gateway.DisConnect(this)
}

//分发用户消息
func (this *Agent) messageDistribution(msg *pb.UserMessage) {
	reply := &pb.RPCMessageReply{}
	log.Debugf("agent:%s uId:%s MessageDistribution msg:%s.%s", this.sessionId, this.uId, msg.MainType, msg.SubType)
	if err := this.gateway.Service().RpcCallByType("worker", string(comm.Rpc_GatewayRoute), context.Background(), &pb.AgentMessage{
		Ip:               this.IP(),
		UserSessionId:    this.sessionId,
		UserId:           this.uId,
		GatewayServiceId: this.gateway.Service().GetId(),
		Method:           fmt.Sprintf("%s.%s", msg.MainType, msg.SubType),
		Message:          msg.Data,
	}, reply); err != nil {
		log.Errorf("agent:%s uId:%s MessageDistribution err:%v", this.sessionId, this.uId, err)
	} else {
		log.Debugf("agent:%s uId:%s MessageDistribution reply:%v", this.sessionId, this.uId, reply)
	}
}