#ifndef PARAGON_UIMANAGER_HPP
#define PARAGON_UIMANAGER_HPP

#include <QtGui/QtGui>
#include <QtCore/QtCore>
#include <QtCore/QObject>
#include <QImageWriter>
#include "irrlicht.h"

namespace client {

    namespace utility {

        /*
        int nextHigherPowerOfTwo (int value) {

            --value;

            int retValue = 1;
            while (retValue < value) {

                retValue <<= 1;
            }

            return retValue;
        }*/
    }

    class UIManager : public QObject {

        Q_OBJECT

        public:

            UIManager () : mWidgetScene (0), mWidgetView (0), mTopLevelWidget (0), mFocusedWidget (0) {

                mWidgetScene = new QGraphicsScene (this);
                mWidgetView = new QGraphicsView (mWidgetScene);
                mWidgetView->setAlignment (Qt::AlignLeft | Qt::AlignTop);

                QEvent wsce (QEvent::WindowActivate);
                QApplication::sendEvent (mWidgetScene, &wsce);

                mWidgetView->setGeometry (QRect (0, 0, 640, 480));

                //connect (mWidgetScene, SIGNAL (changed (const QList <QRectF> &)), this, SLOT (setUiDirty()));

            }

            virtual ~UIManager () {

                QEvent wsce (QEvent::WindowDeactivate);
                QApplication::sendEvent (mWidgetScene, &wsce);
            }

            void setActiveWidget (QWidget *widget) {

                if (mTopLevelWidget && mTopLevelWidget != widget) {

                    if (mFocusedWidget) {

                        QEvent foe (QEvent::FocusOut);
                        QApplication::sendEvent (mFocusedWidget, &foe);
                        mFocusedWidget = NULL;
                    }

                    mWidgetScene->clear();
                    mTopLevelWidget = NULL;
                }

                qDebug () << "added widget";
                mWidgetScene->addWidget (widget);
                mTopLevelWidget = widget;
            }

            void renderIntoTexture (irr::video::ITexture *tex) {

                uchar *pd = (uchar *) tex->lock();

                QImage textureImg ((uchar *)pd, tex->getSize().Width, tex->getSize().Height, QImage::Format_ARGB32_Premultiplied);
                // textureImg.fill (0);

                qDebug () << textureImg.height() << "," << textureImg.width();

                QPainter painter (&textureImg);
                mWidgetView->render (&painter, QRect (QPoint (0, 0), mWidgetView->size()), QRect (QPoint (0, 0), mWidgetView->size()));
                painter.end();

                QImageWriter writer ("foo.png");
                writer.setFormat ("png");
                if (!writer.write (textureImg)) {

                    qDebug () << writer.errorString();
                }

                tex->unlock();

            }

        private:

            QGraphicsScene *mWidgetScene;
            QGraphicsView *mWidgetView;
            QWidget *mTopLevelWidget;
            QWidget *mFocusedWidget;

    };
}

#endif