#include "blankscreen.h"

#include <QApplication>
#include <QProcess>
#include <QDesktopWidget>
#include <QTimer>

#include <X11/Xlib.h>
#include <X11/cursorfont.h>

#include <cassert>
#include <cstring>

struct BlankScreen_Sysdep {
	Display *dpy;
};

BlankScreen::BlankScreen() : QDialog(NULL)
{
	_sysdep = new BlankScreen_Sysdep;
	_sysdep->dpy = XOpenDisplay(NULL);
	if (_sysdep->dpy == NULL)
		return;

	setWindowFlags(Qt::WindowStaysOnTopHint | Qt::X11BypassWindowManagerHint | Qt::FramelessWindowHint);
	setStyleSheet("background-color:#000");

	_locked = false;
	QTimer *upper = new QTimer(this);
	connect(upper, SIGNAL(timeout()), this, SLOT(timer_moveToTop()));
	upper->start(1111);
}

BlankScreen::~BlankScreen()
{
	unlock();
	if (_sysdep->dpy != NULL) {
		XCloseDisplay(_sysdep->dpy);
	}
	delete _sysdep;
}

bool BlankScreen::lock(const QString& message)
{
	if (_locked)
		return true;
	if (_sysdep->dpy == NULL)
		return false;

	_message = message;

	this->setGeometry(QApplication::desktop()->geometry());
	this->showFullScreen();
	this->activateWindow();
	this->raise();

	// grabbing of keyboard and mouse
	XGrabKeyboard(_sysdep->dpy, DefaultRootWindow(_sysdep->dpy) , false, GrabModeAsync, GrabModeAsync, CurrentTime);
	XGrabPointer(_sysdep->dpy, DefaultRootWindow(_sysdep->dpy) , false, 0, GrabModeAsync, GrabModeAsync, None, 0, CurrentTime);


	QProcess ungrabP;
	ungrabP.start("/bin/bash", QStringList() << "/opt/openslx/pvs2/kb-lock.sh");
	ungrabP.waitForFinished();

	_locked = true;
	return true;
}

bool BlankScreen::unlock()
{
	this->hide();
	if (!_locked)
		return true;
	if (_sysdep->dpy == NULL)
		return false;

	// ungrabbing of keyboard and mouse
	XUngrabPointer(_sysdep->dpy, CurrentTime);
	XUngrabKeyboard(_sysdep->dpy, CurrentTime);

	XFlush(_sysdep->dpy);

	/* start the kb-unlock.sh script */
	QProcess regrabP;
	regrabP.start("/bin/bash", QStringList() << "/opt/openslx/pvs2/kb-unlock.sh");
	regrabP.waitForFinished();

	_locked = false;
	return true;
}

void BlankScreen::timer_moveToTop()
{
	if (this->isHidden())
		return;
	activateWindow();
	raise();
}