package server

import (
	olog "git.loafle.net/overflow/log-go"
	orp "git.loafle.net/overflow/rpc-go/protocol"
	orr "git.loafle.net/overflow/rpc-go/registry"
	"git.loafle.net/overflow/server-go"
	oss "git.loafle.net/overflow/server-go/socket"
	ossw "git.loafle.net/overflow/server-go/socket/web"
	"github.com/valyala/fasthttp"
)

type ScannerServlet interface {
	ossw.Servlet
}

type ScannerServlets struct {
	ossw.Servlets

	RPCInvoker     orr.RPCInvoker
	RPCServerCodec orp.ServerCodec
}

func (s *ScannerServlets) Init(serverCtx server.ServerCtx) error {
	if err := s.Servlets.Init(serverCtx); nil != err {
		return err
	}

	return nil
}

func (s *ScannerServlets) OnStart(serverCtx server.ServerCtx) error {
	if err := s.Servlets.OnStart(serverCtx); nil != err {
		return err
	}

	return nil
}

func (s *ScannerServlets) OnStop(serverCtx server.ServerCtx) {

	s.Servlets.OnStop(serverCtx)
}

func (s *ScannerServlets) Destroy(serverCtx server.ServerCtx) {

	s.Servlets.Destroy(serverCtx)
}

func (s *ScannerServlets) Handshake(servletCtx server.ServletCtx, ctx *fasthttp.RequestCtx) (*fasthttp.ResponseHeader, error) {

	return nil, nil
}

func (s *ScannerServlets) OnConnect(servletCtx server.ServletCtx, conn oss.Conn) {
	s.Servlets.OnConnect(servletCtx, conn)

}

func (s *ScannerServlets) OnDisconnect(servletCtx server.ServletCtx) {
	s.Servlets.OnDisconnect(servletCtx)

}

func (s *ScannerServlets) Handle(servletCtx server.ServletCtx,
	stopChan <-chan struct{}, doneChan chan<- struct{},
	readChan <-chan oss.SocketMessage, writeChan chan<- oss.SocketMessage) {

	var (
		src            orp.ServerRequestCodec
		messageType    int
		message        []byte
		result         interface{}
		resMessageType int
		resMessage     []byte
		err            error
	)

	for {
		select {
		case socketMessage, ok := <-readChan:
			if !ok {
				return
			}
			messageType, message = socketMessage()
			// grpc exec method call
			src, err = s.RPCServerCodec.NewRequest(messageType, message)
			if nil != err {
				olog.Logger().Error(err.Error())
				break
			}

			if !s.RPCInvoker.HasMethod(src.Method()) {
				olog.Logger().Error(err.Error())
				s.writeError(src, writeChan, orp.E_NO_METHOD, "", err)
				break
			}

			result, err = s.RPCInvoker.Invoke(src)
			if nil != err {
				olog.Logger().Error(err.Error())
			}

			if !src.HasResponse() {
				break
			}
			resMessageType, resMessage, err = src.NewResponse(result, err)
			if nil != err {
				olog.Logger().Error(err.Error())
				s.writeError(src, writeChan, orp.E_INTERNAL, "", err)
				break
			}

			writeChan <- oss.MakeSocketMessage(resMessageType, resMessage)
		case <-stopChan:
			return
		}
	}
}

func (s *ScannerServlets) writeError(src orp.ServerRequestCodec, writeChan chan<- oss.SocketMessage, code orp.ErrorCode, message string, data interface{}) {
	if !src.HasResponse() {
		return
	}

	pErr := &orp.Error{
		Code:    code,
		Message: message,
		Data:    data,
	}

	resMessageType, resMessage, err := src.NewResponse(nil, pErr)
	if nil != err {
		olog.Logger().Error(err.Error())
		return
	}
	writeChan <- oss.MakeSocketMessage(resMessageType, resMessage)
}