package services

import (
	"context"
	"go_dreamfactory/comm"
	"go_dreamfactory/pb"
	"reflect"
	"sync"

	"go_dreamfactory/lego/base"
	"go_dreamfactory/lego/core"
	"go_dreamfactory/lego/core/cbase"
	"go_dreamfactory/lego/sys/log"

	"github.com/golang/protobuf/proto"
	"github.com/golang/protobuf/ptypes"
)

/*
	服务网关组件 用于接收网关服务发送过来的消息
*/

func NewGateRouteComp() comm.ISC_GateRouteComp {
	comp := new(SComp_GateRouteComp)
	return comp
}

//用户协议处理函数注册的反射对象
type msghandle struct {
	rcvr    reflect.Value
	msgType reflect.Type
	fn      reflect.Method
}

//服务网关组件
type SComp_GateRouteComp struct {
	cbase.ServiceCompBase
	service    base.IRPCXService     //rpc服务对象 通过这个对象可以发布服务和调用其他服务的接口
	mrlock     sync.RWMutex          //msghandles 对象的锁
	msghandles map[string]*msghandle //处理函数的管理对象
}

//设置服务组件名称 方便业务模块中获取此组件对象
func (this *SComp_GateRouteComp) GetName() core.S_Comps {
	return comm.SC_ServiceGateRouteComp
}

//组件初始化函数
func (this *SComp_GateRouteComp) Init(service core.IService, comp core.IServiceComp, options core.ICompOptions) (err error) {
	err = this.ServiceCompBase.Init(service, comp, options)
	this.service = service.(base.IRPCXService)
	this.msghandles = make(map[string]*msghandle)
	return err
}

//组件启动时注册rpc服务监听
func (this *SComp_GateRouteComp) Start() (err error) {
	this.service.RegisterFunctionName(string(comm.Rpc_GatewayRoute), this.ReceiveMsg) //注册网关路由接收接口
	err = this.ServiceCompBase.Start()
	return
}

//业务模块注册用户消息处理路由
func (this *SComp_GateRouteComp) RegisterRoute(methodName string, comp reflect.Value, msg reflect.Type, fn reflect.Method) {
	log.Debugf("注册用户路由【%s】", methodName)
	this.mrlock.RLock()
	_, ok := this.msghandles[methodName]
	this.mrlock.RUnlock()
	if ok {
		log.Errorf("重复 注册网关消息【%s】", methodName)
		return
	}
	this.mrlock.Lock()
	this.msghandles[methodName] = &msghandle{
		rcvr:    comp,
		msgType: msg,
		fn:      fn,
	}
	this.mrlock.Unlock()
}

//Rpc_GatewayRoute服务接口的接收函数
func (this *SComp_GateRouteComp) ReceiveMsg(ctx context.Context, args *pb.AgentMessage, reply *pb.RPCMessageReply) error {
	log.Debugf("SComp_GateRouteComp ReceiveMsg agent:%s uId:%s MessageDistribution msg:%s", args.UserSessionId, args.UserId, args.Method)
	this.mrlock.RLock()
	msghandle, ok := this.msghandles[args.Method]
	this.mrlock.RUnlock()
	if ok {
		session := comm.NewUserSession(this.service, args.Ip, args.UserSessionId, args.GatewayServiceId, args.UserId)
		msg := reflect.New(msghandle.msgType.Elem()).Interface()
		if err := ptypes.UnmarshalAny(args.Message, msg.(proto.Message)); err != nil {
			log.Errorf("UserMessage:%s Unmarshal err:%v", args.Method, err)
			return err
		}
		msghandle.fn.Func.Call([]reflect.Value{msghandle.rcvr, reflect.ValueOf(ctx), reflect.ValueOf(session), reflect.ValueOf(msg)})
	} else {
		reply.Code = pb.ErrorCode_ReqParameterError
		// reply.Msg = pb.GetErrorCodeMsg(pb.ErrorCode_ReqParameterError)
	}
	return nil
}