package processor

import (
	"encoding/json"
	"fmt"
	"github.com/duanhf2012/origin/network"
	"reflect"
)

type MessageJsonInfo struct {
	msgType    reflect.Type
	msgHandler MessageJsonHandler
}

type MessageJsonHandler func(clientId uint64,msg interface{})
type ConnectJsonHandler func(clientId uint64)
type UnknownMessageJsonHandler func(clientId uint64,msg []byte)

type JsonProcessor struct {
	mapMsg map[uint16]MessageJsonInfo
	LittleEndian bool

	unknownMessageHandler UnknownMessageJsonHandler
	connectHandler ConnectJsonHandler
	disconnectHandler ConnectJsonHandler
	network.INetMempool
}

type JsonPackInfo struct {
	typ uint16
	msg interface{}
	rawMsg []byte
}

func NewJsonProcessor() *JsonProcessor {
	processor := &JsonProcessor{mapMsg:map[uint16]MessageJsonInfo{}}
	processor.INetMempool = network.NewMemAreaPool()

	return processor
}

func (jsonProcessor *JsonProcessor) SetByteOrder(littleEndian bool) {
	jsonProcessor.LittleEndian = littleEndian
}

// must goroutine safe
func (jsonProcessor *JsonProcessor ) MsgRoute(msg interface{},userdata interface{}) error{
	pPackInfo := msg.(*JsonPackInfo)
	v,ok := jsonProcessor.mapMsg[pPackInfo.typ]
	if ok == false {
		return fmt.Errorf("cannot find msgtype %d is register!",pPackInfo.typ)
	}

	v.msgHandler(userdata.(uint64),pPackInfo.msg)
	return nil
}

func (jsonProcessor *JsonProcessor) Unmarshal(data []byte) (interface{}, error) {
	typeStruct := struct {Type int `json:"typ"`}{}
	defer jsonProcessor.ReleaseByteSlice(data)
	err := json.Unmarshal(data, &typeStruct)
	if err != nil {
		return nil, err
	}

	msgType := uint16(typeStruct.Type)
	info,ok := jsonProcessor.mapMsg[msgType]
	if ok == false {
		return nil,fmt.Errorf("Cannot find register %d msgType!",msgType)
	}

	msgData := reflect.New(info.msgType.Elem()).Interface()
	err = json.Unmarshal(data, msgData)
	if err != nil {
		return nil,err
	}

	return &JsonPackInfo{typ:msgType,msg:msgData},nil
}

func (jsonProcessor *JsonProcessor) Marshal(msg interface{}) ([]byte, error) {
	rawMsg,err := json.Marshal(msg)
	if err != nil {
		return nil,err
	}

	return rawMsg,nil
}

func (jsonProcessor *JsonProcessor) Register(msgtype uint16,msg interface{},handle MessageJsonHandler)  {
	var info MessageJsonInfo

	info.msgType = reflect.TypeOf(msg)
	info.msgHandler = handle
	jsonProcessor.mapMsg[msgtype] = info
}

func (jsonProcessor *JsonProcessor) MakeMsg(msgType uint16,msg interface{}) *JsonPackInfo {
	return &JsonPackInfo{typ:msgType,msg:msg}
}

func (jsonProcessor *JsonProcessor) MakeRawMsg(msgType uint16,msg []byte) *JsonPackInfo {
	return &JsonPackInfo{typ:msgType,rawMsg:msg}
}

func (jsonProcessor *JsonProcessor) UnknownMsgRoute(msg interface{}, userData interface{}){
	jsonProcessor.unknownMessageHandler(userData.(uint64),msg.([]byte))
}

func (jsonProcessor *JsonProcessor) ConnectedRoute(userData interface{}){
	jsonProcessor.connectHandler(userData.(uint64))
}

func (jsonProcessor *JsonProcessor) DisConnectedRoute(userData interface{}){
	jsonProcessor.disconnectHandler(userData.(uint64))
}

func (jsonProcessor *JsonProcessor) RegisterUnknownMsg(unknownMessageHandler UnknownMessageJsonHandler){
	jsonProcessor.unknownMessageHandler = unknownMessageHandler
}

func (jsonProcessor *JsonProcessor) RegisterConnected(connectHandler ConnectJsonHandler){
	jsonProcessor.connectHandler = connectHandler
}

func (jsonProcessor *JsonProcessor) RegisterDisConnected(disconnectHandler ConnectJsonHandler){
	jsonProcessor.disconnectHandler = disconnectHandler
}

func (slf *JsonPackInfo) GetPackType() uint16 {
	return slf.typ
}

func (slf *JsonPackInfo) GetMsg() interface{} {
	return slf.msg
}