package krpc

import (
	"fmt"
	"io"
	"reflect"
	"sync"

	"krwu.top/krpc.v1/codec"
)

type request struct {
	h      *codec.Header
	argv   reflect.Value
	replyv reflect.Value
}

func (s *Server) readRequestHeader(cc codec.Codec) (*codec.Header, error) {
	var h codec.Header
	if err := cc.ReadHeader(&h); err != nil {
		if err != io.EOF && err != io.ErrUnexpectedEOF {
			fmt.Println("rpc server: read header error:", err)
		}
		return nil, err
	}
	return &h, nil
}
func (s *Server) readRequest(cc codec.Codec) (*request, error) {
	h, err := s.readRequestHeader(cc)
	if err != nil {
		fmt.Println("rpc server: read request error: ", err)
		return nil, err
	}
	req := &request{h: h}
	req.argv = reflect.New(reflect.TypeOf(""))
	if err = cc.ReadBody(req.argv.Interface()); err != nil {
		fmt.Println("rpc server: read argv err: ", err)
	}
	return req, nil
}

func (s *Server) handleRequest(cc codec.Codec, req *request, sending *sync.Mutex, wg *sync.WaitGroup) {
	defer wg.Done()
	fmt.Println("rcp server: ", req.h, req.argv.Elem())
	req.replyv = reflect.ValueOf(fmt.Sprintf("krpc resp %d", req.h.Seq))
	s.sendResponse(cc, req.h, req.replyv.Interface(), sending)
}