package connect

import (
	"container/list"
	"context"
	"gim/config"
	"gim/pkg/grpclib"
	"gim/pkg/logger"
	"gim/pkg/pb"
	"gim/pkg/rpc"
	"sync"
	"time"

	"go.uber.org/zap"

	"google.golang.org/grpc/status"
	"google.golang.org/protobuf/proto"

	"github.com/alberliu/gn"
	"github.com/gorilla/websocket"
)

const (
	CoonTypeTCP int8 = 1 // tcp连接
	ConnTypeWS  int8 = 2 // websocket连接
)

type Conn struct {
	CoonType int8            // 连接类型
	TCP      *gn.Conn        // tcp连接
	WSMutex  sync.Mutex      // WS写锁
	WS       *websocket.Conn // websocket连接
	UserId   int64           // 用户ID
	DeviceId int64           // 设备ID
	RoomId   int64           // 订阅的房间ID
	Element  *list.Element   // 链表节点
}

// Write 写入数据
func (c *Conn) Write(bytes []byte) error {
	if c.CoonType == CoonTypeTCP {
		return c.TCP.WriteWithEncoder(bytes)
	} else if c.CoonType == ConnTypeWS {
		return c.WriteToWS(bytes)
	}
	logger.Logger.Error("unknown conn type", zap.Any("conn", c))
	return nil
}

// WriteToWS 消息写入WebSocket
func (c *Conn) WriteToWS(bytes []byte) error {
	c.WSMutex.Lock()
	defer c.WSMutex.Unlock()

	err := c.WS.SetWriteDeadline(time.Now().Add(10 * time.Millisecond))
	if err != nil {
		return err
	}
	return c.WS.WriteMessage(websocket.BinaryMessage, bytes)
}

// Close 关闭
func (c *Conn) Close() error {
	// 取消设备和连接的对应关系
	if c.DeviceId != 0 {
		DeleteConn(c.DeviceId)
	}

	// 取消订阅，需要异步出去，防止重复加锁造成死锁
	go func() {
		SubscribedRoom(c, 0)
	}()

	if c.DeviceId != 0 {
		_, _ = rpc.GetLogicIntClient().Offline(context.TODO(), &pb.OfflineReq{
			UserId:     c.UserId,
			DeviceId:   c.DeviceId,
			ClientAddr: c.GetAddr(),
		})
	}

	if c.CoonType == CoonTypeTCP {
		c.TCP.Close()
	} else if c.CoonType == ConnTypeWS {
		return c.WS.Close()
	}
	return nil
}

func (c *Conn) GetAddr() string {
	if c.CoonType == CoonTypeTCP {
		return c.TCP.GetAddr()
	} else if c.CoonType == ConnTypeWS {
		return c.WS.RemoteAddr().String()
	}
	return ""
}

// HandleMessage 消息处理
func (c *Conn) HandleMessage(bytes []byte) {
	var input = new(pb.Input)
	err := proto.Unmarshal(bytes, input)
	if err != nil {
		logger.Logger.Error("unmarshal error", zap.Error(err))
		return
	}
	logger.Logger.Debug("HandleMessage", zap.Any("input", input))

	// 对未登录的用户进行拦截
	if input.Type != pb.PackageType_PT_SIGN_IN && c.UserId == 0 {
		// 应该告诉用户没有登录
		return
	}

	switch input.Type {
	case pb.PackageType_PT_SIGN_IN:
		c.SignIn(input)
	case pb.PackageType_PT_SYNC:
		c.Sync(input)
	case pb.PackageType_PT_HEARTBEAT:
		c.Heartbeat(input)
	case pb.PackageType_PT_MESSAGE:
		c.MessageACK(input)
	case pb.PackageType_PT_SUBSCRIBE_ROOM:
		c.SubscribedRoom(input)
	default:
		logger.Logger.Error("handler switch other")
	}
}

// Send 下发消息
func (c *Conn) Send(pt pb.PackageType, requestId int64, message proto.Message, err error) {
	var output = pb.Output{
		Type:      pt,
		RequestId: requestId,
	}

	if err != nil {
		status, _ := status.FromError(err)
		output.Code = int32(status.Code())
		output.Message = status.Message()
	}

	if message != nil {
		msgBytes, err := proto.Marshal(message)
		if err != nil {
			logger.Sugar.Error(err)
			return
		}
		output.Data = msgBytes
	}

	outputBytes, err := proto.Marshal(&output)
	if err != nil {
		logger.Sugar.Error(err)
		return
	}

	err = c.Write(outputBytes)
	if err != nil {
		logger.Sugar.Error(err)
		c.Close()
		return
	}
}

// SignIn 登录
func (c *Conn) SignIn(input *pb.Input) {
	var signIn pb.SignInInput
	err := proto.Unmarshal(input.Data, &signIn)
	if err != nil {
		logger.Sugar.Error(err)
		return
	}

	_, err = rpc.GetLogicIntClient().ConnSignIn(grpclib.ContextWithRequestId(context.TODO(), input.RequestId), &pb.ConnSignInReq{
		UserId:     signIn.UserId,
		DeviceId:   signIn.DeviceId,
		Token:      signIn.Token,
		ConnAddr:   config.LocalAddr,
		ClientAddr: c.GetAddr(),
	})

	c.Send(pb.PackageType_PT_SIGN_IN, input.RequestId, nil, err)
	if err != nil {
		return
	}

	c.UserId = signIn.UserId
	c.DeviceId = signIn.DeviceId
	SetConn(signIn.DeviceId, c)
}

// Sync 消息同步
func (c *Conn) Sync(input *pb.Input) {
	var sync pb.SyncInput
	err := proto.Unmarshal(input.Data, &sync)
	if err != nil {
		logger.Sugar.Error(err)
		return
	}

	resp, err := rpc.GetLogicIntClient().Sync(grpclib.ContextWithRequestId(context.TODO(), input.RequestId), &pb.SyncReq{
		UserId:   c.UserId,
		DeviceId: c.DeviceId,
		Seq:      sync.Seq,
	})

	var message proto.Message
	if err == nil {
		message = &pb.SyncOutput{Messages: resp.Messages, HasMore: resp.HasMore}
	}
	c.Send(pb.PackageType_PT_SYNC, input.RequestId, message, err)
}

// Heartbeat 心跳
func (c *Conn) Heartbeat(input *pb.Input) {
	c.Send(pb.PackageType_PT_HEARTBEAT, input.RequestId, nil, nil)

	logger.Sugar.Infow("heartbeat", "device_id", c.DeviceId, "user_id", c.UserId)
}

// MessageACK 消息收到回执
func (c *Conn) MessageACK(input *pb.Input) {
	var messageACK pb.MessageACK
	err := proto.Unmarshal(input.Data, &messageACK)
	if err != nil {
		logger.Sugar.Error(err)
		return
	}

	_, _ = rpc.GetLogicIntClient().MessageACK(grpclib.ContextWithRequestId(context.TODO(), input.RequestId), &pb.MessageACKReq{
		UserId:      c.UserId,
		DeviceId:    c.DeviceId,
		DeviceAck:   messageACK.DeviceAck,
		ReceiveTime: messageACK.ReceiveTime,
	})
}

// SubscribedRoom 订阅房间
func (c *Conn) SubscribedRoom(input *pb.Input) {
	var subscribeRoom pb.SubscribeRoomInput
	err := proto.Unmarshal(input.Data, &subscribeRoom)
	if err != nil {
		logger.Sugar.Error(err)
		return
	}

	SubscribedRoom(c, subscribeRoom.RoomId)
	c.Send(pb.PackageType_PT_SUBSCRIBE_ROOM, input.RequestId, nil, nil)
	_, err = rpc.GetLogicIntClient().SubscribeRoom(context.TODO(), &pb.SubscribeRoomReq{
		UserId:   c.UserId,
		DeviceId: c.DeviceId,
		RoomId:   subscribeRoom.RoomId,
		Seq:      subscribeRoom.Seq,
		ConnAddr: config.LocalAddr,
	})
	if err != nil {
		logger.Logger.Error("SubscribedRoom error", zap.Error(err))
	}
}