/*===========================================================================*\
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 *                              OpenFlipper                                  *
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/*===========================================================================*\
 *                                                                           *
 *   $Revision$                                                         *
 *   $Author$                                                      *
 *   $Date$                   *
 *                                                                           *
\*===========================================================================*/

//=============================================================================
//
//  CLASS QtWidgetNode
//
//=============================================================================

#ifndef QT_WIDGET_NODE_HH
#define QT_WIDGET_NODE_HH

//== INCLUDES =================================================================

#include <ACG/Geometry/Types/PlaneType.hh>
#include <ACG/Scenegraph/BaseNode.hh>
#include <ACG/Scenegraph/DrawModes.hh>
#include <ACG/GL/VertexDeclaration.hh>
#include <ACG/GL/IRenderer.hh>
#include <ACG/GL/GLPrimitives.hh>
#include <OpenFlipper/common/ObjectTypeDLLDefines.hh>


#include <QObject>
#include <QWidget>

//== NAMESPACES ===============================================================

namespace ACG {
namespace SceneGraph {

//== CLASS DEFINITION =========================================================

class OBJECTTYPEDLLEXPORT QtWidgetNode : public BaseNode
{
    using Plane = ACG::Geometry::Plane;
public:
    /** \brief Construct a QtWidget Node
     *
     * @param _widget The widget which will be rendered in the viewport
     * @param _parent The parent node in the scenegraph
     * @param _name   The name of the new node (visible in the scenegraph dialogs)
     */
    QtWidgetNode(QWidget* _widget, BaseNode *_parent = 0, std::string _name = "<QtWidgetNode>");

    /// destructor
    ~QtWidgetNode();

    /// static name of this class
    ACG_CLASSNAME(QtWidgetNode);

    /// return available draw modes
    ACG::SceneGraph::DrawModes::DrawMode availableDrawModes() const override;

    /// update bounding box
    void boundingBox(ACG::Vec3d & _bbMin, ACG::Vec3d & _bbMax) override;

    /** \brief Add the objects to the given renderer
     *
     * @param _renderer The renderer which will be used. Add your geometry into this class
     * @param _state    The current GL State when this object is called
     * @param _drawMode The active draw mode
     * @param _mat      Current material
     */
    void getRenderObjects(ACG::IRenderer* _renderer, ACG::GLState&  _state , const ACG::SceneGraph::DrawModes::DrawMode&  _drawMode , const ACG::SceneGraph::Material* _mat) override;


    void mouseEvent(GLState& _state, QMouseEvent* _event) override;
    void mouseEvent(QMouseEvent* _event);

    QWidget* widget()const{return widget_;}
    /// set a new widget at the current widgets position (if last widget wasn't zero)
    void setWidget(QWidget* _w);

private:
    class NodeEventFilter : public QObject
    {
    public:
      explicit NodeEventFilter(QtWidgetNode* p){node_ = p;}
    protected:
      bool eventFilter(QObject *obj, QEvent *event);
    private:
      QtWidgetNode *node_;
    } *ef_;

    friend class NodeEventFilter;

    /// create and update the widget texture
    void createTexture();

    /// widgetgeometry will be screen aligned. the width/height and position is in respect to the _state projection matrix
    void createGeometry(GLState& _state);

    /// update geometry on current position with old projection/view matrix
    void updateGeometry();

    /// upload widget plane data to graphics card
    void uploadPlane();

    /// VBO used to render the plane
    unsigned int vbo_;
    GLuint texID_;
    ACG::VertexDeclaration vertexDecl_;

    /// current widget
    QWidget* widget_;

    /// initial widgetHeight/Width. Is 0, if widget is 0 or if plane wasn't initialized with current view/projMatrix
    int oldWidgetWidth_;
    int oldWidgetHeight_;

    /// plane position and dimensions
    Plane plane_;
    bool planeCreated_;

    /// last state
    GLState* state_;

    bool anisotropicSupport_;

};

//=============================================================================
} // namespace SceneGraph
} // namespace ACG

//=============================================================================
#endif // QT_WIDGET_NODE_HH defined
//=============================================================================