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#include "server.h"

#include <QtNetwork/QTcpServer>
#include <QtNetwork/QTcpSocket>
#include "util.h"
#include "pacman.pb.h"
#include "block.h"

Server::Server(QWidget *parent)
  : SceneHolder(parent)
{
  qDebug() << "waiting for clients";
  waitForClientConnections();
  qDebug() << "clients connected";

  updateMap(Util::createDummyMap());

  QTimer *timer = new QTimer(this);
  connect(timer, SIGNAL(timeout()), this, SLOT(tick()));
  timer->start(Constants::tick);
}

void Server::tick()
{
  qDebug() << "doing srv update";
  Transmission::map_t map =  calculateUpdates();
  updateMap(map);

  QSharedPointer<ProtoBuf::MapUpdate> packet = createUpdatePacket(map);
  sendUpdate(packet);
}

Transmission::map_t Server::calculateUpdates()
{
  Transmission::map_t map = Util::createEmptyMap();

  QMapIterator<Color::Color, Actor::Movement> i(m_actorMovements);
  while (i.hasNext()) {
    i.next();
    Actor *actor = m_actors.value( i.key() );
    QPoint mapPosition = CoordToMapPosition(actor->x(), actor->y());
    qDebug() << "actor " << i.key() << " is at " << mapPosition;

    QPoint newMapPosition = mapPosition;
    switch (i.value()) {
      case Actor::Up: newMapPosition += QPoint(0, -1); break;
      case Actor::Down: newMapPosition += QPoint(0, 1); break;
      case Actor::Left: newMapPosition += QPoint(-1, 0); break;
      case Actor::Right: newMapPosition += QPoint(1, 0); break;
      case Actor::None: break;
      default: Q_ASSERT(false);
    }
    if (newMapPosition.x() < 0) newMapPosition.setX(0);
    if (newMapPosition.x() >= visualMap.size()) newMapPosition.setX(visualMap.size()-1);
    if (newMapPosition.y() < 0) newMapPosition.setY(0);
    if (newMapPosition.y() >= visualMap[newMapPosition.x()].size()) newMapPosition.setY(visualMap[newMapPosition.x()].size()-1);

    // <t3h g4m3 10gic>
    if (0 <= newMapPosition.x() && newMapPosition.x() < visualMap.size() &&
      0 <= newMapPosition.y() && newMapPosition.y() < visualMap[newMapPosition.x()].size()) {
      if(dynamic_cast<Block*>(visualMap[newMapPosition.x()][newMapPosition.y()]) != 0) {
        continue;
      }
    }
    // </t3h g4m2 10gic>

    if (mapPosition != newMapPosition) {
    map[mapPosition.x()][mapPosition.y()] = Transmission::empty;
    map[newMapPosition.x()][newMapPosition.y()] =
              Transmission::pacman | i.key() |
              Util::actorMovementToTransmission(i.value()) ;
    }
  }
  return map;
}

QSharedPointer< ProtoBuf::MapUpdate > Server::createUpdatePacket(Transmission::map_t map)
{
  QSharedPointer<ProtoBuf::MapUpdate> updatePacket =
    QSharedPointer<ProtoBuf::MapUpdate>(new ProtoBuf::MapUpdate);

  for (unsigned int x = 0; x < Constants::map_size.width; ++x) {
   for (unsigned int y = 0; y < Constants::map_size.height; ++y) {
      updatePacket->add_field(map[x][y]);
    }
  }
  updatePacket->set_round_points_red(m_actors.value(Color::red)->getRoundPoints());
  updatePacket->set_game_points_red(m_actors.value(Color::red)->getGamePoints());
  updatePacket->set_round_points_green(m_actors.value(Color::green)->getRoundPoints());
  updatePacket->set_game_points_green(m_actors.value(Color::green)->getGamePoints());
  updatePacket->set_round_points_blue(m_actors.value(Color::blue)->getRoundPoints());
  updatePacket->set_game_points_blue(m_actors.value(Color::blue)->getGamePoints());
  //qDebug() << "field sz "<< updatePacket->field_size();
  return updatePacket;
}

void Server::waitForClientConnections()
{
  QTcpServer *tcpSrv = new QTcpServer(this);
  // server must stay alive as long as sockets (qt parent mem mechanism)
  tcpSrv->listen(QHostAddress::Any, Constants::port);

#define SINGLE

  Color::Color playerColors[3] = { Color::red, Color::blue, Color::green };
#ifdef SINGLE
  for (unsigned int i=0; i<1; ++i) {
#else
  for (unsigned int i=0; i<Color::max; ++i) {
#endif
    bool connectionAvailable = tcpSrv->waitForNewConnection(-1);
    Q_ASSERT(connectionAvailable);
    QTcpSocket *socket =  tcpSrv->nextPendingConnection();
    connect(socket, SIGNAL(readyRead()), this, SLOT(keyPressUpdate()));

    // assign color
    Color::Color color = playerColors[i];
    m_clientConnections[color] = socket;
    // notify player of color
    ProtoBuf::WhoAmI packet;
    packet.set_color(color);
    Util::sendPacket(packet, socket);
  }
}

void Server::sendUpdate(QSharedPointer< ProtoBuf::MapUpdate > packet)
{
  std::string dataStr = packet->SerializeAsString();
  const char *data = dataStr.c_str();
  foreach(QTcpSocket *socket, m_clientConnections) {
    Util::sendPacket(data, dataStr.length(), socket);
  }
}

void Server::keyPressUpdate()
{
  qDebug() << "kpress";
  QMapIterator<Color::Color, QTcpSocket*> i(m_clientConnections);
  while (i.hasNext()) {
    i.next();
    Color::Color color = i.key();
    QTcpSocket *socket = i.value();
    qDebug() << "data?";
    if (socket->bytesAvailable() > 0) {
      qDebug() << "data!";
      std::string dataStr;
      Util::QByteArrayToStdString(socket->readAll(), dataStr);
      ProtoBuf::KeyPressUpdate packet;
      packet.ParseFromString(dataStr);
      Transmission::field_t direction = packet.newkey();
      qDebug() << "data:" << direction;
      m_actorMovements[ color ] = Util::transmissionMovementToActor(direction);
    }
  }
}

int main(int argc, char ** argv)
{
  GOOGLE_PROTOBUF_VERIFY_VERSION;

  QApplication app(argc, argv);
  app.setApplicationName("Pacman Server");
  app.setWindowIcon(QIcon(":/appicon"));

  qsrand(QTime(0, 0, 0).secsTo(QTime::currentTime()));

  Server Server;

  return app.exec();
}