/****************************************************************************
Copyright (c) 2006, Radon Labs GmbH
Copyright (c) 2011-2013,WebJet Business Division,CYOU
 
http://www.genesis-3d.com.cn

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#include "stdneb.h"
#include "net/tcp/stdtcpclientconnection.h"
#include "io/memorystream.h"

namespace Net
{
__ImplementClass(Net::StdTcpClientConnection, 'STCC', Core::RefCounted);

using namespace Util;
using namespace IO;

//------------------------------------------------------------------------------
/**
*/
StdTcpClientConnection::StdTcpClientConnection()
{
    // empty
}

//------------------------------------------------------------------------------
/**
*/
StdTcpClientConnection::~StdTcpClientConnection()
{
    this->Shutdown();
}

//------------------------------------------------------------------------------
/**
*/
bool
StdTcpClientConnection::Connect(const GPtr<Socket>& sock)
{
    n_assert(!this->socket.isvalid());
    n_assert(sock.isvalid());
    n_assert(sock->IsOpen());
    
    // check if socket is really actually connected
    if (sock->IsConnected())
    {
        this->socket = sock;
        this->socket->SetBlocking(true);
        this->socket->SetNoDelay(true);
        this->sendStream = MemoryStream::Create();
        this->recvStream = MemoryStream::Create();
        n_printf("Client from addr=%s connected!\n", 
            this->socket->GetAddress().GetHostAddr().AsCharPtr());
        return true;
    }
    return false;
}

//------------------------------------------------------------------------------
/**
*/
bool
StdTcpClientConnection::IsConnected() const
{
    if (this->socket.isvalid())
    {
        return this->socket->IsConnected();
    }
    else
    {
        return false;
    }
}

//------------------------------------------------------------------------------
/**
*/
void
StdTcpClientConnection::Shutdown()
{
    if (this->socket.isvalid())
    {
        this->socket->Close();
        this->socket = 0;
    }
    this->sendStream = 0;
    this->recvStream = 0;
}

//------------------------------------------------------------------------------
/**
*/
const IpAddress&
StdTcpClientConnection::GetClientAddress() const
{
    n_assert(this->socket.isvalid());
    return this->socket->GetAddress();
}

//------------------------------------------------------------------------------
/**
*/
Socket::Result
StdTcpClientConnection::Send(const GPtr<Stream>& stream)
{
    n_assert(stream.isvalid());
    if (stream->GetSize() == 0)
    {
        // nothing to send
        return Socket::Success;
    }
    
    Socket::Result res = Socket::Success;
    stream->SetAccessMode(Stream::ReadAccess);
    if (stream->Open())
    {
        // we may not exceed the maximum message size...
        // so we may have to split the send data into
        // multiple packets
        SizeT maxMsgSize = this->socket->GetMaxMsgSize();
        SizeT sendSize = stream->GetSize();
        uchar* ptr = (uchar*) stream->Map();
        SizeT overallBytesSent = 0;
        while ((Socket::Success == res) && (overallBytesSent < sendSize))
        {
            SizeT bytesToSend = sendSize - overallBytesSent;
            if (bytesToSend > maxMsgSize)
            {
                bytesToSend = maxMsgSize;
            }
            SizeT bytesSent = 0;
            res = this->socket->Send(ptr, bytesToSend, bytesSent);
            ptr += bytesSent;
            overallBytesSent += bytesSent;
        }
        stream->Unmap();
        stream->Close();
    }
    return res;
}

//------------------------------------------------------------------------------
/**
*/
Socket::Result
StdTcpClientConnection::Send()
{
    n_assert(this->sendStream.isvalid());
    Socket::Result res = this->Send(this->sendStream);
    this->sendStream->SetSize(0);
    return res;
}

//------------------------------------------------------------------------------
/**
*/
Socket::Result
StdTcpClientConnection::Recv()
{
    n_assert(this->recvStream.isvalid());
    this->recvStream->SetAccessMode(Stream::WriteAccess);
    this->recvStream->SetSize(0);
    Socket::Result res = Socket::Success;
    if (this->recvStream->Open())
    {
        // NOTE: the following loop will make sure that Recv()
        // never blocks
        uchar buf[1024];
        while ((Socket::Success == res) && (this->socket->HasRecvData()))
        {
            SizeT bytesReceived = 0;
            res = this->socket->Recv(&buf, sizeof(buf), bytesReceived);
            if ((bytesReceived > 0) && (Socket::Success == res))
            {
                this->recvStream->Write(buf, bytesReceived);
            }
        }
        this->recvStream->Close();
    }
    this->recvStream->SetAccessMode(Stream::ReadAccess);
    if (Socket::Success == res)
    {
        if (this->recvStream->GetSize() > 0)
        {
            return Socket::Success;
        }
        else
        {
            return Socket::WouldBlock;
        }
    }
    else
    {
        return res;
    }
}

//------------------------------------------------------------------------------
/**
*/
const GPtr<Stream>&
StdTcpClientConnection::GetSendStream()
{
    return this->sendStream;
}

//------------------------------------------------------------------------------
/**
*/
const GPtr<Stream>&
StdTcpClientConnection::GetRecvStream()
{
    return this->recvStream;
}

} // namespace Net