/*

 * Hedgewars, a worms-like game

 * Copyright (c) 2006 Igor Ulyanov <iulyanov@gmail.com>

 *

 * This program 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; version 2 of the License

 *

 * This program 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 this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 */

#include "tcpBase.h"

#include <QMessageBox>

#include <QList>

#include <QImage>

#include "hwconsts.h"

QList<TCPBase*> srvsList;

QTcpServer* TCPBase::IPCServer(0);

TCPBase::TCPBase(bool demoMode) :

  m_isDemoMode(demoMode),

  IPCSocket(0)

{

  if(!IPCServer) {

    IPCServer = new QTcpServer(this);

    IPCServer->setMaxPendingConnections(1);

    if (!IPCServer->listen(QHostAddress::LocalHost)) {

      QMessageBox::critical(0, tr("Error"),

			    tr("Unable to start the server: %1.")

			    .arg(IPCServer->errorString()));

      exit(0); // FIXME - should be graceful exit here

    }

  }

  ipc_port=IPCServer->serverPort();

}

void TCPBase::NewConnection()

{

  if(IPCSocket) {

    // connection should be already finished

    return;

  }

  IPCSocket = IPCServer->nextPendingConnection();

  if(!IPCSocket) return;

  connect(IPCSocket, SIGNAL(disconnected()), this, SLOT(ClientDisconnect()));

  connect(IPCSocket, SIGNAL(readyRead()), this, SLOT(ClientRead()));

  SendToClientFirst();

}

void TCPBase::RealStart()

{

  connect(IPCServer, SIGNAL(newConnection()), this, SLOT(NewConnection()));

  IPCSocket = 0;

  QProcess * process;

  process = new QProcess;

  connect(process, SIGNAL(error(QProcess::ProcessError)), this, SLOT(StartProcessError(QProcess::ProcessError)));

  QStringList arguments=setArguments();

  process->start(bindir->absolutePath() + "/hwengine", arguments);

}

void TCPBase::ClientDisconnect()

{

  IPCSocket->close();

  IPCSocket->deleteLater();

  // IPCSocket = 0; // FIXME: breaks image receiving

  onClientDisconnect();

  readbuffer.clear();

  if(srvsList.size()==1) srvsList.pop_front();

  emit isReadyNow();

}

void TCPBase::ClientRead()

{

  readbuffer.append(IPCSocket->readAll());

  onClientRead();

}

void TCPBase::StartProcessError(QProcess::ProcessError error)

{

  QMessageBox::critical(0, tr("Error"),

			tr("Unable to run engine: %1 (")

			.arg(error) + bindir->absolutePath() + "/hwengine)");

}

void TCPBase::tcpServerReady()

{

  disconnect(srvsList.front(), SIGNAL(isReadyNow()), *(++srvsList.begin()), SLOT(tcpServerReady()));

  srvsList.pop_front();

  RealStart();

}

void TCPBase::Start()

{

  if(srvsList.isEmpty()) {

    srvsList.push_back(this);

  } else {

    connect(srvsList.back(), SIGNAL(isReadyNow()), this, SLOT(tcpServerReady()));

    srvsList.push_back(this);

    return;

  }

  RealStart();

}

void TCPBase::onClientRead()

{

}

void TCPBase::onClientDisconnect()

{

}

void TCPBase::SendToClientFirst()

{

}

void TCPBase::SendIPC(const QByteArray & buf)

{

	if (buf.size() > MAXMSGCHARS) return;

	quint8 len = buf.size();

	RawSendIPC(QByteArray::fromRawData((char *)&len, 1) + buf);

}

void TCPBase::RawSendIPC(const QByteArray & buf)

{

	if (!IPCSocket)

	{

		toSendBuf += buf;

	} else

	{

		if (toSendBuf.size() > 0)

		{

			IPCSocket->write(toSendBuf);

			if(m_isDemoMode) demo->append(toSendBuf);

			toSendBuf.clear();

		}

		if(!buf.isEmpty()) {

		  IPCSocket->write(buf);

		  if(m_isDemoMode && demo) demo->append(buf);

		}

	}

}