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/*
    This file is part of go-ethereum

    go-ethereum is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    go-ethereum is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with go-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
package rpc

import (
    "fmt"
    "net"
    "net/http"

    "github.com/ethereum/go-ethereum/logger"
    "github.com/ethereum/go-ethereum/xeth"
)

var jsonlogger = logger.NewLogger("JSON")

type JsonRpcServer struct {
    quit     chan bool
    listener net.Listener
    pipe     *xeth.JSXEth
}

func (s *JsonRpcServer) exitHandler() {
out:
    for {
        select {
        case <-s.quit:
            s.listener.Close()
            break out
        }
    }

    jsonlogger.Infoln("Shutdown JSON-RPC server")
}

func (s *JsonRpcServer) Stop() {
    close(s.quit)
}

func (s *JsonRpcServer) Start() {
    jsonlogger.Infoln("Starting JSON-RPC server")
    go s.exitHandler()

    h := apiHandler(&EthereumApi{pipe: s.pipe})
    http.Handle("/", h)

    err := http.Serve(s.listener, nil)
    // TODO Complains on shutdown due to listner already being closed
    if err != nil {
        jsonlogger.Errorln("Error on JSON-RPC interface:", err)
    }
}

func NewJsonRpcServer(pipe *xeth.JSXEth, port int) (*JsonRpcServer, error) {
    sport := fmt.Sprintf(":%d", port)
    l, err := net.Listen("tcp", sport)
    if err != nil {
        return nil, err
    }

    return &JsonRpcServer{
        listener: l,
        quit:     make(chan bool),
        pipe:     pipe,
    }, nil
}

func apiHandler(xeth *EthereumApi) http.Handler {
    fn := func(w http.ResponseWriter, req *http.Request) {
        jsonlogger.Debugln("Handling request")

        reqParsed, reqerr := JSON.ParseRequestBody(req)
        if reqerr != nil {
            JSON.Send(w, &RpcErrorResponse{JsonRpc: reqParsed.JsonRpc, ID: reqParsed.ID, Error: true, ErrorText: ErrorParseRequest})
            return
        }

        var response interface{}
        reserr := JSON.GetRequestReply(xeth, &reqParsed, &response)
        if reserr != nil {
            jsonlogger.Errorln(reserr)
            JSON.Send(w, &RpcErrorResponse{JsonRpc: reqParsed.JsonRpc, ID: reqParsed.ID, Error: true, ErrorText: reserr.Error()})
            return
        }

        jsonlogger.Debugf("Generated response: %T %s", response, response)
        JSON.Send(w, &RpcSuccessResponse{JsonRpc: reqParsed.JsonRpc, ID: reqParsed.ID, Error: false, Result: response})
    }

    return http.HandlerFunc(fn)
}