// **********************************************************************
//
// Copyright (c) 2003-2017 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************

namespace IceInternal
{
    using System;
    using System.ComponentModel;
    using System.Diagnostics;
    using System.Collections.Generic;
    using System.Net;
    using System.Net.Sockets;

    sealed class TcpTransceiver : Transceiver, WSTransceiverDelegate
    {
        public Socket fd()
        {
            return _stream.fd();
        }

        public int initialize(Buffer readBuffer, Buffer writeBuffer, ref bool hasMoreData)
        {
            return _stream.connect(readBuffer, writeBuffer, ref hasMoreData);
        }

        public int closing(bool initiator, Ice.LocalException ex)
        {
            // If we are initiating the connection closure, wait for the peer
            // to close the TCP/IP connection. Otherwise, close immediately.
            return initiator ? SocketOperation.Read : SocketOperation.None;
        }

        public void close()
        {
            _stream.close();
        }

        public EndpointI bind()
        {
            Debug.Assert(false);
            return null;
        }

        public void destroy()
        {
            _stream.destroy();
        }

        public int write(Buffer buf)
        {
            return _stream.write(buf);
        }

        public int read(Buffer buf, ref bool hasMoreData)
        {
            return _stream.read(buf);
        }

        public bool startRead(Buffer buf, AsyncCallback callback, object state)
        {
            return _stream.startRead(buf, callback, state);
        }

        public void finishRead(Buffer buf)
        {
            _stream.finishRead(buf);
        }

        public bool startWrite(Buffer buf, AsyncCallback callback, object state, out bool completed)
        {
            return _stream.startWrite(buf, callback, state, out completed);
        }

        public void finishWrite(Buffer buf)
        {
            _stream.finishWrite(buf);
        }

        public string protocol()
        {
            return _instance.protocol();
        }

        public Ice.ConnectionInfo getInfo()
        {
            Ice.TCPConnectionInfo info = new Ice.TCPConnectionInfo();
            fillConnectionInfo(info);
            return info;
        }

        public Ice.ConnectionInfo getWSInfo(Dictionary<string, string> headers)
        {
            Ice.WSConnectionInfo info = new Ice.WSConnectionInfo();
            fillConnectionInfo(info);
            info.headers = headers;
            return info;
        }

        public void checkSendSize(Buffer buf)
        {
        }

        public void setBufferSize(int rcvSize, int sndSize)
        {
            _stream.setBufferSize(rcvSize, sndSize);
        }

        public override string ToString()
        {
            return _stream.ToString();
        }

        public string toDetailedString()
        {
            return ToString();
        }

        //
        // Only for use by TcpConnector, TcpAcceptor
        //
        internal TcpTransceiver(ProtocolInstance instance, StreamSocket stream)
        {
            _instance = instance;
            _stream = stream;
        }

        private void fillConnectionInfo(Ice.TCPConnectionInfo info)
        {
            if(_stream.fd() != null)
            {
                EndPoint localEndpoint = Network.getLocalAddress(_stream.fd());
                info.localAddress = Network.endpointAddressToString(localEndpoint);
                info.localPort = Network.endpointPort(localEndpoint);
                EndPoint remoteEndpoint = Network.getRemoteAddress(_stream.fd());
                info.remoteAddress = Network.endpointAddressToString(remoteEndpoint);
                info.remotePort = Network.endpointPort(remoteEndpoint);
                info.rcvSize = Network.getRecvBufferSize(_stream.fd());
                info.sndSize = Network.getSendBufferSize(_stream.fd());
            }
        }

        private readonly ProtocolInstance _instance;
        private readonly StreamSocket _stream;
    }
}