#include <QTranslator>
#include <QNetworkInterface>

#include "serverapp.h"

static QSize minimalGridSize(const QMap<QString, QPoint>& clientPositions, QSize& clientSize);

ServerApp::ServerApp(int& argc, char** argv)
	: QApplication(argc, argv),
		_mainWindow(NULL),
		_managerOnly(false),
		_isExam(false)
{
	setOrganizationName("openslx");
	setOrganizationDomain("openslx.org");
	setApplicationName("pvsmgr");

	_arguments = parseParameters();

	loadRooms();

	// If started in manager-only mode, and there is no current room
	// after reading the config, exit right away
	if (_managerOnly && _currentRoom == "") {
		::exit(0);
		return;
	}

	// System strings
	QTranslator *qtTranslator = new QTranslator(this);
	qtTranslator->load(QLocale::system(), "qt", "_", QLibraryInfo::location(QLibraryInfo::TranslationsPath));
	installTranslator(qtTranslator);
	// App specific
	QTranslator *translator = new QTranslator(this);
	translator->load(QLocale::system(), ":", "l_");
	installTranslator(translator);

	/* Set the global path of the settings */
	QSettings::setPath(QSettings::IniFormat, QSettings::SystemScope, "/opt/");
	QSharedPointer<QSettings> sys = getSettings();
	qDebug() << "System settings are in:" << sys->fileName();

	_mainWindow = new MainWindow();
}

QStringList ServerApp::parseParameters()
{
	QStringList rest;
	for (QString a : QApplication::arguments()) {
		if (a == "--manager-only") {
			_managerOnly = true;
			break;
		} else if (a.startsWith("--config=")) {
			_iniPath = a.mid(9);
		} else {
			rest << a;
		}
	}
	return rest;

}

QStringList ServerApp::arguments()
{
	return _arguments;
}

void ServerApp::loadRooms()
{
	QSharedPointer<QSettings> conf = getSettings();

	if (!conf->contains("rooms")) { qDebug() << "Invalid config file (no rooms are set)!"; return; }
	QStringList rooms = conf->value("rooms").toStringList();

	for (QString roomId : rooms) {
		conf->beginGroup(roomId);
		QString roomName = conf->value("name").toString();

		/* fallback to the old format where the room id was actually just the name */
		if (roomName == "") {
			roomName = roomId;
		}
		if (!conf->contains("mgrIP")) {
			qDebug() << "Warning: Incomplete config file (room " << roomName << " needs a mgrIP)!";
		}
		QMap<QString, QPoint> clientPositions;
		// First store all room configurations in _rooms.
		int size = conf->beginReadArray("client");
		for (int j = 0; j < size; j++) {
			conf->setArrayIndex(j);
			clientPositions.insert(conf->value("ip").toString(), conf->value("pos").toPoint());
		}
		conf->endArray();

		/* read backgroundImage */
		QString image   = conf->contains("backgroundImage") ? conf->value("backgroundImage").toString() : "";
		QString mgrIP   = conf->value("mgrIP").toString();
		QString tutorIP = conf->value("tutorIP").toString();

		QSize gridSize;
		QSize clientSize(1, 1);
		/* read some other properties of the room */
		if (conf->contains("gridSize")) {
			gridSize = conf->value("gridSize").toSize();
		}
		if (conf->contains("clientSize")) {
			clientSize = conf->value("clientSize").toSize();
		}

		foreach (const QHostAddress & address, QNetworkInterface::allAddresses()) {
			if (address != QHostAddress(QHostAddress::LocalHost) && mgrIP == address.toString()) {
				qDebug("Found this ip in config.");
				_currentRoom = roomName;
			}
		}
		conf->endGroup();

		if (!gridSize.isValid()) {
			/* ok, let's choose the minimum gridSize to fit all clients */
			gridSize = minimalGridSize(clientPositions, clientSize);
			qDebug() << "had to use minimalGridSize(): = " << gridSize;

		}
		Room* r = new Room(clientPositions, gridSize, clientSize, image, tutorIP);
		qDebug() << "read new room: " << roomName << ": " << gridSize << ", " << clientSize;
		_rooms.insert(roomName, r);
	}
}

const Room* ServerApp::getCurrentRoom()
{
	if (_rooms.contains(_currentRoom)) {
		return _rooms[_currentRoom];
	} else {
		static Room* defaultRoom = NULL;
		if (defaultRoom == NULL) {
			defaultRoom = new Room(QMap<QString,
			                       QPoint>(), QSize(8, 6), QSize(1, 1), "", "");
		}
		return defaultRoom;
	}
}
void ServerApp::setSessionName(const QString& name)
{
	_sessionName = name;
	_sessionNameArray = name.toUtf8();
}

void ServerApp::setSessionName()
{
	const QString name = QString::number(qrand() % 9000 + 1000);
	_sessionName = name;
	_sessionNameArray = name.toUtf8();
}

QSharedPointer<QSettings> ServerApp::getSettings()
{
	QSharedPointer<QSettings> set;
	if (_iniPath == "") {
		/* default location (system scope) */
		set = QSharedPointer<QSettings>(new QSettings(QSettings::IniFormat, QSettings::SystemScope, "openslx/pvs2", "pvs2"));
	} else {
		/* use _iniPath to find ini file */
		set = QSharedPointer<QSettings>(new QSettings(_iniPath, QSettings::IniFormat));
	}
	set->setIniCodec("UTF-8");
	return set;
}

/**
  * returns the minimal grid size such that all clients fit on the grid
  **/
static QSize minimalGridSize(const QMap<QString, QPoint>& clientPositions, QSize& clientSize)
{
	/* collect the maximum coordinates */
	int x = 0;
	int y = 0;

	for (auto it = clientPositions.begin(); it != clientPositions.end(); ++it) {
		QPoint pos = it.value();
		if (pos.x() > x) { x = pos.x(); }
		if (pos.y() > y) { y = pos.y(); }

	}
	/* need a little extra space */
	QSize size(x + clientSize.width(), y + clientSize.height());
	return size;
}