package comms

import (
	"io"
	"net"

	"github.com/ethereum/go-ethereum/logger"
	"github.com/ethereum/go-ethereum/logger/glog"
	"github.com/ethereum/go-ethereum/rpc/api"
	"github.com/ethereum/go-ethereum/rpc/codec"
	"github.com/ethereum/go-ethereum/rpc/shared"
)

const (
	jsonrpcver           = "2.0"
	maxHttpSizeReqLength = 1024 * 1024 // 1MB
)

type EthereumClient interface {
	Close()
	Send(interface{}) error
	Recv() (interface{}, error)
}

func handle(conn net.Conn, api api.EthereumApi, c codec.Codec) {
	codec := c.New(conn)

	for {
		req, err := codec.ReadRequest()
		if err == io.EOF {
			codec.Close()
			return
		} else if err != nil {
			glog.V(logger.Error).Infof("comms recv err - %v\n", err)
			codec.Close()
			return
		}

		var rpcResponse interface{}
		res, err := api.Execute(req)

		rpcResponse = shared.NewRpcResponse(req.Id, req.Jsonrpc, res, err)
		err = codec.WriteResponse(rpcResponse)
		if err != nil {
			glog.V(logger.Error).Infof("comms send err - %v\n", err)
			codec.Close()
			return
		}
	}
}