#include "hwmap.h"

#include "hwconsts.h"

#include <QMessageBox>

#include <QMutex>

#include <QList>

int HWMap::isBusy(0); // initialize static variable

QList<HWMap*> srvsList;

QMutex tcpSrvMut;

HWMap::HWMap() :

  m_isStarted(false)

{

}

HWMap::~HWMap()

{

}

void HWMap::getImage(std::string seed) 

{

  m_seed=seed;

  Start();

}

void HWMap::ClientDisconnect()

{

  QImage im((uchar*)(const char*)readbuffer, 256, 128, QImage::Format_Mono);

  im.setNumColors(2);

  IPCSocket->close();

  IPCServer->close();

  //deleteLater();

  tcpSrvMut.lock();

  if(isBusy) --isBusy;

  tcpSrvMut.unlock();

  emit ImageReceived(im);

  readbuffer.clear();

  emit isReadyNow();

}

void HWMap::ClientRead()

{

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

}

void HWMap::SendToClientFirst()

{

  std::string toSend=std::string("eseed ")+m_seed;

  char ln=(char)toSend.length();

  IPCSocket->write(&ln, 1);

  IPCSocket->write(toSend.c_str(), ln);

  IPCSocket->write("\x01!", 2);

}

void HWMap::NewConnection()

{

  QTcpSocket * client = IPCServer->nextPendingConnection();

  if(!IPCSocket) {

    IPCServer->close();

    IPCSocket = client;

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

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

    SendToClientFirst();

  } else {

    qWarning("2nd IPC client?!");

    client->disconnectFromHost();

  }

}

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

{

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

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

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

}

void HWMap::tcpServerReady()

{

  tcpSrvMut.lock();

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

  srvsList.pop_front();

  tcpSrvMut.unlock();

  RealStart();

}

void HWMap::Start()

{

  tcpSrvMut.lock();

  if(!isBusy) {

    ++isBusy;

    srvsList.push_back(this);

    tcpSrvMut.unlock();

  } else {

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

    srvsList.push_back(this);

    //deleteLater();

    tcpSrvMut.unlock();

    return;

  }

  RealStart();

}

void HWMap::RealStart()

{

  IPCSocket = 0;

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

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

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

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

  }

  QProcess * process;

  QStringList arguments;

  process = new QProcess;

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

  arguments << "46631";

  arguments << "landpreview";

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

}