package rpc

import (
	"fmt"
	"github.com/duanhf2012/originnet/log"
	"github.com/duanhf2012/originnet/network"
	"math"
	"net"
	"reflect"
	"strings"
)

var processor iprocessor = &JsonProcessor{}
var LittleEndian bool

type Call struct {
	Seq uint64
	//ServiceMethod string
	Arg interface{}
	Reply interface{}
	Respone *RpcResponse
	Err error
	done          chan *Call  // Strobes when call is complete.
	connid int
	callback *reflect.Value
	rpcHandler IRpcHandler
}

func (slf *Call) Done() *Call{
	return <-slf.done
}

type iprocessor interface {
	Marshal(v interface{}) ([]byte, error)
	Unmarshal(data []byte, v interface{}) error
}

type Server struct {
	functions map[interface{}]interface{}
	listenAddr string //ip:port

	cmdchannel chan *Call

	rpcHandleFinder RpcHandleFinder
	rpcserver *network.TCPServer
}

type RpcHandleFinder interface {
	FindRpcHandler(serviceMethod string) IRpcHandler
}

func (slf *Server) Init(rpcHandleFinder RpcHandleFinder) {
	slf.cmdchannel = make(chan *Call,10000)
	slf.rpcHandleFinder = rpcHandleFinder
	slf.rpcserver = &network.TCPServer{}
}

func (slf *Server) Start(listenAddr string) {
	slf.listenAddr = listenAddr
	slf.rpcserver.Addr = listenAddr
	slf.rpcserver.LenMsgLen = 2 //uint16
	slf.rpcserver.MinMsgLen = 2
	slf.rpcserver.MaxMsgLen = math.MaxUint16
	slf.rpcserver.MaxConnNum = 10000
	slf.rpcserver.PendingWriteNum = 10000
	slf.rpcserver.NewAgent =slf.NewAgent
	slf.rpcserver.LittleEndian = LittleEndian
	slf.rpcserver.Start()
}


func (gate *RpcAgent) OnDestroy() {}

type RpcAgent struct {
	conn     network.Conn
	rpcserver     *Server
	userData interface{}
}

type RpcRequestRw struct {
	//
	ServiceMethod string   // format: "Service.Method"
	//Seq           uint64   // sequence number chosen by client
	InputParam []byte

	requestHandle RequestHandler
}

func (agent *RpcAgent) Run() {
	for {
		data,err := agent.conn.ReadMsg()
		if err != nil {
			log.Debug("read message: %v", err)
			break
		}

		if processor==nil{
			log.Error("Rpc Processor not set!")
			continue
		}

		var req RpcRequest
		//解析head
		err = processor.Unmarshal(data,&req)
		if err != nil {
			log.Debug("processor message: %v", err)
			agent.Close()
			break
		}

		//交给程序处理
		serviceMethod := strings.Split(req.ServiceMethod,".")
		if len(serviceMethod)!=2 {
			log.Debug("rpc request req.ServiceMethod is error")
			continue
		}
		rpcHandler := agent.rpcserver.rpcHandleFinder.FindRpcHandler(serviceMethod[0])
		if rpcHandler== nil {
			log.Error("service method %s not config!", req.ServiceMethod)
			continue
		}
		if req.NoReply == false {
			req.requestHandle = func(Returns interface{},Err error){
				var rpcRespone RpcResponse
				rpcRespone.Seq = req.Seq
				rpcRespone.Err = Err
				if Err==nil {
					rpcRespone.Returns,rpcRespone.Err = processor.Marshal(Returns)
				}

				bytes,err :=  processor.Marshal(rpcRespone)
				if err != nil {
					log.Error("service method %s Marshal error:%+v!", req.ServiceMethod,err)
					return
				}

				err = agent.conn.WriteMsg(bytes)
				if err != nil {
					log.Error("Rpc %s return is error:%+v",req.ServiceMethod,err)
				}
			}
		}

		if req.MutiCoroutine == true {
			go rpcHandler.HandlerRpcRequest(&req)
		}else{
			rpcHandler.PushRequest(&req)
		}

	}
}

func (agent *RpcAgent) OnClose() {
}

func (agent *RpcAgent) WriteMsg(msg interface{}) {
}

func (agent *RpcAgent) LocalAddr() net.Addr {
	return agent.conn.LocalAddr()
}

func (agent *RpcAgent) RemoteAddr() net.Addr {
	return agent.conn.RemoteAddr()
}

func (agent *RpcAgent)  Close() {
	agent.conn.Close()
}

func (agent *RpcAgent) Destroy() {
	agent.conn.Destroy()
}


func (slf *Server) NewAgent(conn *network.TCPConn) network.Agent {
	agent := &RpcAgent{conn: conn, rpcserver: slf}

	return agent
}

func (slf *Server) myselfRpcHandlerGo(handlerName string,methodName string, args interface{},reply interface{}) error {
	rpcHandler := slf.rpcHandleFinder.FindRpcHandler(handlerName)
	if rpcHandler== nil {
		err := fmt.Errorf("service method %s.%s not config!", handlerName,methodName)
		log.Error("%s",err.Error())
		return err
	}

	return rpcHandler.CallMethod(fmt.Sprintf("%s.%s",handlerName,methodName),args,reply)
}


func (slf *Server) rpcHandlerGo(noReply bool,mutiCoroutine bool,handlerName string,methodName string, args interface{},reply interface{}) *Call {
	pCall := &Call{}
	pCall.done = make( chan *Call,1)
	rpcHandler := slf.rpcHandleFinder.FindRpcHandler(handlerName)
	if rpcHandler== nil {
		pCall.Err = fmt.Errorf("service method %s.%s not config!", handlerName,methodName)
		log.Error("%s",pCall.Err.Error())
		pCall.done <- pCall
		return pCall
	}
	var req RpcRequest
	req.ServiceMethod = fmt.Sprintf("%s.%s",handlerName,methodName)
	req.localParam = args
	req.localReply = reply
	req.NoReply = noReply

	if noReply == false {
		req.requestHandle = func(Returns interface{},Err error){
			pCall.Err = Err
			pCall.done <- pCall
		}
	}

	if mutiCoroutine == true {
		go rpcHandler.HandlerRpcRequest(&req)
	}else{
		rpcHandler.PushRequest(&req)
	}

	return pCall
}

func (slf *Server) rpcHandlerAsyncGo(callerRpcHandler IRpcHandler,noReply bool,mutiCoroutine bool,handlerName string,methodName string,args interface{},reply interface{},callback reflect.Value) error {
	pCall := &Call{}
	//pCall.done = make( chan *Call,1)
	pCall.rpcHandler = callerRpcHandler
	pCall.callback = &callback
	rpcHandler := slf.rpcHandleFinder.FindRpcHandler(handlerName)
	if rpcHandler== nil {
		err := fmt.Errorf("service method %s.%s not config!", handlerName,methodName)
		log.Error("%+v",err)
		return err
	}

	var req RpcRequest
	req.ServiceMethod = fmt.Sprintf("%s.%s",handlerName,methodName)
	req.localParam = args
	req.localReply = reply
	req.NoReply = noReply
	req.MutiCoroutine = mutiCoroutine

	if noReply == false {
		req.requestHandle = func(Returns interface{},Err error){
			pCall.Err = Err
			pCall.Reply = Returns
			pCall.rpcHandler.(*RpcHandler).callResponeCallBack<-pCall
		}
	}

	if mutiCoroutine == true {
		go rpcHandler.HandlerRpcRequest(&req)
	}else{
		rpcHandler.PushRequest(&req)
	}

	return nil
}