package rpc

import (
	"errors"
	"fmt"
	"github.com/duanhf2012/origin/log"
	"reflect"
	"runtime"
	"strconv"
	"strings"
	"unicode"
	"unicode/utf8"
)

const maxClusterNode int = 128

type FuncRpcClient func(nodeId int, serviceMethod string, client []*Client) (error, int)
type FuncRpcServer func() *Server

var nilError = reflect.Zero(reflect.TypeOf((*error)(nil)).Elem())

type RpcError string

var NilError RpcError

func (e RpcError) Error() string {
	return string(e)
}

func ConvertError(e error) RpcError {
	if e == nil {
		return NilError
	}

	rpcErr := RpcError(e.Error())
	return rpcErr
}

type RpcMethodInfo struct {
	method           reflect.Method
	inParamValue     reflect.Value
	inParam          interface{}
	outParamValue    reflect.Value
	hasResponder     bool
	rpcProcessorType RpcProcessorType
}

type RawRpcCallBack interface {
	Unmarshal(data []byte) (interface{}, error)
	CB(data interface{})
}

type IRpcHandlerChannel interface {
	PushRpcResponse(call *Call) error
	PushRpcRequest(rpcRequest *RpcRequest) error
}

type RpcHandler struct {
	IRpcHandlerChannel

	rpcHandler      IRpcHandler
	mapFunctions    map[string]RpcMethodInfo
	mapRawFunctions map[uint32]RawRpcCallBack
	funcRpcClient   FuncRpcClient
	funcRpcServer   FuncRpcServer

	pClientList []*Client
}

type TriggerRpcEvent func(bConnect bool, clientSeq uint32, nodeId int)
type INodeListener interface {
	OnNodeConnected(nodeId int)
	OnNodeDisconnect(nodeId int)
}

type IDiscoveryServiceListener interface {
	OnDiscoveryService(nodeId int, serviceName []string)
	OnUnDiscoveryService(nodeId int, serviceName []string)
}

type IRpcHandler interface {
	IRpcHandlerChannel
	GetName() string
	InitRpcHandler(rpcHandler IRpcHandler, getClientFun FuncRpcClient, getServerFun FuncRpcServer, rpcHandlerChannel IRpcHandlerChannel)
	GetRpcHandler() IRpcHandler
	HandlerRpcRequest(request *RpcRequest)
	HandlerRpcResponseCB(call *Call)
	CallMethod(ServiceMethod string, param interface{}, reply interface{}) error
	AsyncCall(serviceMethod string, args interface{}, callback interface{}) error
	Call(serviceMethod string, args interface{}, reply interface{}) error
	Go(serviceMethod string, args interface{}) error
	AsyncCallNode(nodeId int, serviceMethod string, args interface{}, callback interface{}) error
	CallNode(nodeId int, serviceMethod string, args interface{}, reply interface{}) error
	GoNode(nodeId int, serviceMethod string, args interface{}) error
	RawGoNode(rpcProcessorType RpcProcessorType, nodeId int, rpcMethodId uint32, serviceName string, rawArgs IRawInputArgs) error
	CastGo(serviceMethod string, args interface{}) error
	IsSingleCoroutine() bool
	UnmarshalInParam(rpcProcessor IRpcProcessor, serviceMethod string, rawRpcMethodId uint32, inParam []byte) (interface{}, error)
}

func reqHandlerNull(Returns interface{}, Err RpcError) {
}

var requestHandlerNull reflect.Value

func init() {
	requestHandlerNull = reflect.ValueOf(reqHandlerNull)
}

func (handler *RpcHandler) GetRpcHandler() IRpcHandler {
	return handler.rpcHandler
}

func (handler *RpcHandler) InitRpcHandler(rpcHandler IRpcHandler, getClientFun FuncRpcClient, getServerFun FuncRpcServer, rpcHandlerChannel IRpcHandlerChannel) {
	handler.IRpcHandlerChannel = rpcHandlerChannel
	handler.mapRawFunctions = make(map[uint32]RawRpcCallBack)
	handler.rpcHandler = rpcHandler
	handler.mapFunctions = map[string]RpcMethodInfo{}
	handler.funcRpcClient = getClientFun
	handler.funcRpcServer = getServerFun
	handler.pClientList = make([]*Client, maxClusterNode)
	handler.RegisterRpc(rpcHandler)
}

// Is this an exported - upper case - name?
func isExported(name string) bool {
	r, _ := utf8.DecodeRuneInString(name)
	return unicode.IsUpper(r)
}

// Is this type exported or a builtin?
func (handler *RpcHandler) isExportedOrBuiltinType(t reflect.Type) bool {
	for t.Kind() == reflect.Ptr {
		t = t.Elem()
	}
	// PkgPath will be non-empty even for an exported type,
	// so we need to check the type name as well.
	return isExported(t.Name()) || t.PkgPath() == ""
}

func (handler *RpcHandler) suitableMethods(method reflect.Method) error {
	//只有RPC_开头的才能被调用
	if strings.Index(method.Name, "RPC_") != 0 {
		return nil
	}

	//取出输入参数类型
	var rpcMethodInfo RpcMethodInfo
	typ := method.Type
	if typ.NumOut() != 1 {
		return fmt.Errorf("%s The number of returned arguments must be 1", method.Name)
	}

	if typ.Out(0).String() != "error" {
		return fmt.Errorf("%s The return parameter must be of type error", method.Name)
	}

	if typ.NumIn() < 2 || typ.NumIn() > 4 {
		return fmt.Errorf("%s Unsupported parameter format", method.Name)
	}

	//1.判断第一个参数
	var parIdx = 1
	if typ.In(parIdx).String() == "rpc.RequestHandler" {
		parIdx += 1
		rpcMethodInfo.hasResponder = true
	}

	for i := parIdx; i < typ.NumIn(); i++ {
		if handler.isExportedOrBuiltinType(typ.In(i)) == false {
			return fmt.Errorf("%s Unsupported parameter types", method.Name)
		}
	}

	rpcMethodInfo.inParamValue = reflect.New(typ.In(parIdx).Elem())
	rpcMethodInfo.inParam = reflect.New(typ.In(parIdx).Elem()).Interface()
	pt, _ := GetProcessorType(rpcMethodInfo.inParamValue.Interface())
	rpcMethodInfo.rpcProcessorType = pt

	parIdx++
	if parIdx < typ.NumIn() {
		rpcMethodInfo.outParamValue = reflect.New(typ.In(parIdx).Elem())
	}

	rpcMethodInfo.method = method
	handler.mapFunctions[handler.rpcHandler.GetName()+"."+method.Name] = rpcMethodInfo
	return nil
}

func (handler *RpcHandler) RegisterRpc(rpcHandler IRpcHandler) error {
	typ := reflect.TypeOf(rpcHandler)
	for m := 0; m < typ.NumMethod(); m++ {
		method := typ.Method(m)
		err := handler.suitableMethods(method)
		if err != nil {
			panic(err)
		}
	}

	return nil
}

func (handler *RpcHandler) HandlerRpcResponseCB(call *Call) {
	defer func() {
		if r := recover(); r != nil {
			buf := make([]byte, 4096)
			l := runtime.Stack(buf, false)
			errString := fmt.Sprint(r)
			log.SError("core dump info[", errString, "]\n", string(buf[:l]))
		}
	}()

	if call.Err == nil {
		call.callback.Call([]reflect.Value{reflect.ValueOf(call.Reply), nilError})
	} else {
		call.callback.Call([]reflect.Value{reflect.ValueOf(call.Reply), reflect.ValueOf(call.Err)})
	}
	ReleaseCall(call)
}

func (handler *RpcHandler) HandlerRpcRequest(request *RpcRequest) {
	if request.requestHandle == nil {
		defer ReleaseRpcRequest(request)
	}

	defer func() {
		if r := recover(); r != nil {
			buf := make([]byte, 4096)
			l := runtime.Stack(buf, false)
			errString := fmt.Sprint(r)
			log.SError("Handler Rpc ", request.RpcRequestData.GetServiceMethod(), " Core dump info[", errString, "]\n", string(buf[:l]))
			rpcErr := RpcError("call error : core dumps")
			if request.requestHandle != nil {
				request.requestHandle(nil, rpcErr)
			}
		}
	}()

	//如果是原始RPC请求
	rawRpcId := request.RpcRequestData.GetRpcMethodId()
	if rawRpcId > 0 {
		v, ok := handler.mapRawFunctions[rawRpcId]
		if ok == false {
			log.SError("RpcHandler cannot find request rpc id", rawRpcId)
			return
		}

		v.CB(request.inParam)
		return
	}

	//普通的rpc请求
	v, ok := handler.mapFunctions[request.RpcRequestData.GetServiceMethod()]
	if ok == false {
		err := "RpcHandler " + handler.rpcHandler.GetName() + "cannot find " + request.RpcRequestData.GetServiceMethod()
		log.SError(err)
		if request.requestHandle != nil {
			request.requestHandle(nil, RpcError(err))
		}
		return
	}

	var paramList []reflect.Value
	var err error
	//生成Call参数
	paramList = append(paramList, reflect.ValueOf(handler.GetRpcHandler())) //接受者
	if v.hasResponder == true {
		if request.requestHandle != nil {
			responder := reflect.ValueOf(request.requestHandle)
			paramList = append(paramList, responder)
		} else {
			paramList = append(paramList, requestHandlerNull)
		}
	}

	paramList = append(paramList, reflect.ValueOf(request.inParam))
	var oParam reflect.Value
	if v.outParamValue.IsValid() {
		if request.localReply != nil {
			oParam = reflect.ValueOf(request.localReply) //输出参数
		} else {
			oParam = reflect.New(v.outParamValue.Type().Elem())
		}
		paramList = append(paramList, oParam) //输出参数
	} else if request.requestHandle != nil && v.hasResponder == false { //调用方有返回值，但被调用函数没有返回参数
		rErr := "Call Rpc " + request.RpcRequestData.GetServiceMethod() + " without return parameter!"
		log.SError(rErr)
		request.requestHandle(nil, RpcError(rErr))
		return
	}
	returnValues := v.method.Func.Call(paramList)
	errInter := returnValues[0].Interface()
	if errInter != nil {
		err = errInter.(error)
	}

	if request.requestHandle != nil && v.hasResponder == false {
		request.requestHandle(oParam.Interface(), ConvertError(err))
	}
}

func (handler *RpcHandler) CallMethod(ServiceMethod string, param interface{}, reply interface{}) error {
	var err error
	v, ok := handler.mapFunctions[ServiceMethod]
	if ok == false {
		err = errors.New("RpcHandler " + handler.rpcHandler.GetName() + " cannot find" + ServiceMethod)
		log.SError(err.Error())
		return err
	}

	var paramList []reflect.Value
	paramList = append(paramList, reflect.ValueOf(handler.GetRpcHandler())) //接受者
	paramList = append(paramList, reflect.ValueOf(param))
	paramList = append(paramList, reflect.ValueOf(reply)) //输出参数

	returnValues := v.method.Func.Call(paramList)
	errInter := returnValues[0].Interface()
	if errInter != nil {
		err = errInter.(error)
	}

	return err
}

func (handler *RpcHandler) goRpc(processor IRpcProcessor, bCast bool, nodeId int, serviceMethod string, args interface{}) error {
	var pClientList [maxClusterNode]*Client
	err, count := handler.funcRpcClient(nodeId, serviceMethod, pClientList[:])
	if count == 0 {
		if err != nil {
			log.SError("Call ", serviceMethod, " is error:", err.Error())
		} else {
			log.SError("Can not find ", serviceMethod)
		}
		return err
	}

	if count > 1 && bCast == false {
		log.SError("Cannot call %s more then 1 node!", serviceMethod)
		return errors.New("cannot call more then 1 node")
	}

	//2.rpcClient调用
	//如果调用本结点服务
	for i := 0; i < count; i++ {
		if pClientList[i].bSelfNode == true {
			pLocalRpcServer := handler.funcRpcServer()
			//判断是否是同一服务
			findIndex := strings.Index(serviceMethod, ".")
			if findIndex == -1 {
				sErr := errors.New("Call serviceMethod " + serviceMethod + " is error!")
				log.SError(sErr.Error())
				err = sErr

				continue
			}
			serviceName := serviceMethod[:findIndex]
			if serviceName == handler.rpcHandler.GetName() { //自己服务调用
				//调用自己rpcHandler处理器
				return pLocalRpcServer.myselfRpcHandlerGo(serviceName, serviceMethod, args, nil)
			}
			//其他的rpcHandler的处理器
			pCall := pLocalRpcServer.selfNodeRpcHandlerGo(processor, pClientList[i], true, serviceName, 0, serviceMethod, args, nil, nil)
			if pCall.Err != nil {
				err = pCall.Err
			}
			pClientList[i].RemovePending(pCall.Seq)
			ReleaseCall(pCall)
			continue
		}

		//跨node调用
		pCall := pClientList[i].Go(true, serviceMethod, args, nil)
		if pCall.Err != nil {
			err = pCall.Err
		}
		pClientList[i].RemovePending(pCall.Seq)
		ReleaseCall(pCall)
	}

	return err
}

func (handler *RpcHandler) callRpc(nodeId int, serviceMethod string, args interface{}, reply interface{}) error {
	var pClientList [maxClusterNode]*Client
	err, count := handler.funcRpcClient(nodeId, serviceMethod, pClientList[:])
	if err != nil {
		log.SError("Call serviceMethod is error:", err.Error())
		return err
	} else if count <= 0 {
		err = errors.New("Call serviceMethod is error:cannot find " + serviceMethod)
		log.SError(err.Error())
		return err
	} else if count > 1 {
		log.SError("Cannot call more then 1 node!")
		return errors.New("cannot call more then 1 node")
	}

	//2.rpcClient调用
	//如果调用本结点服务
	pClient := pClientList[0]
	if pClient.bSelfNode == true {
		pLocalRpcServer := handler.funcRpcServer()
		//判断是否是同一服务
		findIndex := strings.Index(serviceMethod, ".")
		if findIndex == -1 {
			err := errors.New("Call serviceMethod " + serviceMethod + "is error!")
			log.SError(err.Error())
			return err
		}
		serviceName := serviceMethod[:findIndex]
		if serviceName == handler.rpcHandler.GetName() { //自己服务调用
			//调用自己rpcHandler处理器
			return pLocalRpcServer.myselfRpcHandlerGo(serviceName, serviceMethod, args, reply)
		}
		//其他的rpcHandler的处理器
		pCall := pLocalRpcServer.selfNodeRpcHandlerGo(nil, pClient, false, serviceName, 0, serviceMethod, args, reply, nil)
		err = pCall.Done().Err
		pClient.RemovePending(pCall.Seq)
		ReleaseCall(pCall)
		return err
	}

	//跨node调用
	pCall := pClient.Go(false, serviceMethod, args, reply)
	if pCall.Err != nil {
		err = pCall.Err
		ReleaseCall(pCall)
		return err
	}
	err = pCall.Done().Err
	pClient.RemovePending(pCall.Seq)
	ReleaseCall(pCall)
	return err
}

func (handler *RpcHandler) asyncCallRpc(nodeId int, serviceMethod string, args interface{}, callback interface{}) error {
	fVal := reflect.ValueOf(callback)
	if fVal.Kind() != reflect.Func {
		err := errors.New("call " + serviceMethod + " input callback param is error!")
		log.SError(err.Error())
		return err
	}

	if fVal.Type().NumIn() != 2 {
		err := errors.New("call " + serviceMethod + " callback param function is error!")
		log.SError(err.Error())
		return err
	}

	if fVal.Type().In(0).Kind() != reflect.Ptr || fVal.Type().In(1).String() != "error" {
		err := errors.New("call " + serviceMethod + " callback param function is error!")
		log.SError(err.Error())
		return err
	}

	reply := reflect.New(fVal.Type().In(0).Elem()).Interface()
	var pClientList [maxClusterNode]*Client
	err, count := handler.funcRpcClient(nodeId, serviceMethod, pClientList[:])
	if count == 0 || err != nil {
		strNodeId := strconv.Itoa(nodeId)
		if err == nil {
			err = errors.New("cannot find rpcClient from nodeId " + strNodeId + " " + serviceMethod)
		}
		fVal.Call([]reflect.Value{reflect.ValueOf(reply), reflect.ValueOf(err)})
		log.SError("Call serviceMethod is error:", err.Error())
		return nil
	}

	if count > 1 {
		err := errors.New("cannot call more then 1 node")
		fVal.Call([]reflect.Value{reflect.ValueOf(reply), reflect.ValueOf(err)})
		log.SError(err.Error())
		return nil
	}

	//2.rpcClient调用
	//如果调用本结点服务
	pClient := pClientList[0]
	if pClient.bSelfNode == true {
		pLocalRpcServer := handler.funcRpcServer()
		//判断是否是同一服务
		findIndex := strings.Index(serviceMethod, ".")
		if findIndex == -1 {
			err := errors.New("Call serviceMethod " + serviceMethod + " is error!")
			fVal.Call([]reflect.Value{reflect.ValueOf(reply), reflect.ValueOf(err)})
			log.SError(err.Error())
			return nil
		}
		serviceName := serviceMethod[:findIndex]
		//调用自己rpcHandler处理器
		if serviceName == handler.rpcHandler.GetName() { //自己服务调用
			err := pLocalRpcServer.myselfRpcHandlerGo(serviceName, serviceMethod, args, reply)
			if err == nil {
				fVal.Call([]reflect.Value{reflect.ValueOf(reply), nilError})
			} else {
				fVal.Call([]reflect.Value{reflect.ValueOf(reply), reflect.ValueOf(err)})
			}
		}

		//其他的rpcHandler的处理器
		err = pLocalRpcServer.selfNodeRpcHandlerAsyncGo(pClient, handler, false, serviceName, serviceMethod, args, reply, fVal)
		if err != nil {
			fVal.Call([]reflect.Value{reflect.ValueOf(reply), reflect.ValueOf(err)})
		}
		return nil
	}

	//跨node调用
	err = pClient.AsyncCall(handler, serviceMethod, fVal, args, reply)
	if err != nil {
		fVal.Call([]reflect.Value{reflect.ValueOf(reply), reflect.ValueOf(err)})
	}
	return nil
}

func (handler *RpcHandler) GetName() string {
	return handler.rpcHandler.GetName()
}

func (handler *RpcHandler) IsSingleCoroutine() bool {
	return handler.rpcHandler.IsSingleCoroutine()
}

func (handler *RpcHandler) AsyncCall(serviceMethod string, args interface{}, callback interface{}) error {
	return handler.asyncCallRpc(0, serviceMethod, args, callback)
}

func (handler *RpcHandler) Call(serviceMethod string, args interface{}, reply interface{}) error {
	return handler.callRpc(0, serviceMethod, args, reply)
}

func (handler *RpcHandler) Go(serviceMethod string, args interface{}) error {
	return handler.goRpc(nil, false, 0, serviceMethod, args)
}

func (handler *RpcHandler) AsyncCallNode(nodeId int, serviceMethod string, args interface{}, callback interface{}) error {
	return handler.asyncCallRpc(nodeId, serviceMethod, args, callback)
}

func (handler *RpcHandler) CallNode(nodeId int, serviceMethod string, args interface{}, reply interface{}) error {
	return handler.callRpc(nodeId, serviceMethod, args, reply)
}

func (handler *RpcHandler) GoNode(nodeId int, serviceMethod string, args interface{}) error {
	return handler.goRpc(nil, false, nodeId, serviceMethod, args)
}

func (handler *RpcHandler) CastGo(serviceMethod string, args interface{}) error {
	return handler.goRpc(nil, true, 0, serviceMethod, args)
}

func (handler *RpcHandler) RawGoNode(rpcProcessorType RpcProcessorType, nodeId int, rpcMethodId uint32, serviceName string, rawArgs IRawInputArgs) error {
	processor := GetProcessor(uint8(rpcProcessorType))
	err, count := handler.funcRpcClient(nodeId, serviceName, handler.pClientList)
	if count == 0 || err != nil {
		//args.DoGc()
		log.SError("Call serviceMethod is error:", err.Error())
		return err
	}
	if count > 1 {
		//args.DoGc()
		err := errors.New("cannot call more then 1 node")
		log.SError(err.Error())
		return err
	}

	//2.rpcClient调用
	//如果调用本结点服务
	for i := 0; i < count; i++ {
		if handler.pClientList[i].bSelfNode == true {
			pLocalRpcServer := handler.funcRpcServer()
			//调用自己rpcHandler处理器
			if serviceName == handler.rpcHandler.GetName() { //自己服务调用
				err := pLocalRpcServer.myselfRpcHandlerGo(serviceName, serviceName, rawArgs.GetRawData(), nil)
				//args.DoGc()
				return err
			}

			//其他的rpcHandler的处理器
			pCall := pLocalRpcServer.selfNodeRpcHandlerGo(processor, handler.pClientList[i], true, serviceName, rpcMethodId, serviceName, nil, nil, rawArgs.GetRawData())
			rawArgs.DoEscape()
			if pCall.Err != nil {
				err = pCall.Err
			}
			handler.pClientList[i].RemovePending(pCall.Seq)
			ReleaseCall(pCall)
			continue
		}

		//跨node调用
		pCall := handler.pClientList[i].RawGo(processor, true, rpcMethodId, serviceName, rawArgs.GetRawData(), nil)
		rawArgs.DoFree()
		if pCall.Err != nil {
			err = pCall.Err
		}
		handler.pClientList[i].RemovePending(pCall.Seq)
		ReleaseCall(pCall)
	}

	return err
}

func (handler *RpcHandler) RegRawRpc(rpcMethodId uint32, rawRpcCB RawRpcCallBack) {
	handler.mapRawFunctions[rpcMethodId] = rawRpcCB
}

func (handler *RpcHandler) UnmarshalInParam(rpcProcessor IRpcProcessor, serviceMethod string, rawRpcMethodId uint32, inParam []byte) (interface{}, error) {
	if rawRpcMethodId > 0 {
		v, ok := handler.mapRawFunctions[rawRpcMethodId]
		if ok == false {
			strRawRpcMethodId := strconv.FormatUint(uint64(rawRpcMethodId), 10)
			err := errors.New("RpcHandler cannot find request rpc id " + strRawRpcMethodId)
			log.SError(err.Error())
			return nil, err
		}

		msg, err := v.Unmarshal(inParam)
		if err != nil {
			strRawRpcMethodId := strconv.FormatUint(uint64(rawRpcMethodId), 10)
			err := errors.New("RpcHandler cannot Unmarshal rpc id " + strRawRpcMethodId)
			log.SError(err.Error())
			return nil, err
		}

		return msg, err
	}

	v, ok := handler.mapFunctions[serviceMethod]
	if ok == false {
		return nil, errors.New("RpcHandler " + handler.rpcHandler.GetName() + " cannot find " + serviceMethod)
	}

	var err error
	param := reflect.New(v.inParamValue.Type().Elem()).Interface()
	err = rpcProcessor.Unmarshal(inParam, param)
	return param, err
}