/***************************************************************************
 *   Copyright (c) 2004 Jürgen Riegel <juergen.riegel@web.de>              *
 *                                                                         *
 *   This file is part of the FreeCAD CAx development system.              *
 *                                                                         *
 *   This library is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU Library General Public           *
 *   License as published by the Free Software Foundation; either          *
 *   version 2 of the License, or (at your option) any later version.      *
 *                                                                         *
 *   This library  is distributed in the hope that it will be useful,      *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU Library General Public License for more details.                  *
 *                                                                         *
 *   You should have received a copy of the GNU Library General Public     *
 *   License along with this library; see the file COPYING.LIB. If not,    *
 *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
 *   Suite 330, Boston, MA  02111-1307, USA                                *
 *                                                                         *
 ***************************************************************************/


#ifndef GUI_VIEW3DINVENTORVIEWER_H
#define GUI_VIEW3DINVENTORVIEWER_H

#include <list>
#include <map>
#include <set>
#include <vector>

#include <Base/Type.h>
#include <Inventor/Qt/viewers/SoQtViewer.h>
#include <Inventor/nodes/SoEventCallback.h>
#include <Inventor/Qt/SoQtCursor.h>
#include <QCursor>

#include <Gui/Selection.h>


class SoSeparator;
class SoShapeHints;
class SoMaterial;
class SoRotationXYZ;
class SbSphereSheetProjector;
class SoEventCallback;
class SbBox2s;
class SoVectorizeAction;
class QGLFramebufferObject;
class QImage;
class SoGroup;

namespace Gui {

class ViewProvider;
class SoFCBackgroundGradient;
class NavigationStyle;
class SoFCUnifiedSelection;
class Document;
class SoFCUnifiedSelection;
class GLGraphicsItem;
class SoShapeScale;

/** The Inventor viewer
 *
 */
class GuiExport View3DInventorViewer : public SoQtViewer, public Gui::SelectionSingleton::ObserverType
{
    SOQT_OBJECT_ABSTRACT_HEADER(View3DInventorViewer, SoQtViewer);

public:
    /// Background modes for the savePicture() method
    enum eBackgroundType { 
        Current     = 0,  /**< Use the current viewer Background */
        Black       = 1,  /**< Black background */
        White       = 2,  /**< White background  */ 
        Transparent = 3,  /**< Transparent background  */
    };
    /// Pick modes for picking points in the scene
    enum SelectionMode {
        Lasso       = 0,  /**< Select objects using a lasso. */
        Rectangle   = 1,  /**< Select objects using a rectangle. */
        Rubberband  = 2,  /**< Select objects using a rubberband. */
        BoxZoom     = 3,  /**< Perform a box zoom. */
        Clip        = 4,  /**< Clip objects using a lasso. */
    };
    /** @name Modus handling of the viewer
      * Here the you can switch on/off several features
      * and modies of the Viewer
      */
    //@{
    enum ViewerMod {
        ShowCoord=1,       /**< Enables the Coordinate system in the corner. */
        ShowFPS  =2,       /**< Enables the Frams per Second counter. */
        SimpleBackground=4,/**< switch to a simple background. */
        DisallowRotation=8,/**< switch of the rotation. */
        DisallowPanning=16,/**< switch of the panning. */
        DisallowZooming=32,/**< switch of the zooming. */
    };
    //@}
    
    /** @name Anti-Aliasing modes of the rendered 3D scene
      * Here you can switch between different methods for anti aliasing wich provide quite different results
      * at different runtime impact. 
      * - Smoothing enables openGL line and vertex smoothing which is basicly deprecadet
      * - MSAA is hardeware multi sampling (with 2, 4 or 8 passes), a quite commom and efficient AA technique
      */
    //@{
    enum AntiAliasing {
        None,
        Smoothing,
        MSAA2x,
        MSAA4x,
        MSAA8x
    };
    //@}

    View3DInventorViewer (QWidget *parent, const char *name=NULL, SbBool embed=true, 
                          Type type= SoQtViewer::BROWSER, SbBool build=true);
    virtual ~View3DInventorViewer();

    /// Observer message from the Selection
    virtual void OnChange(Gui::SelectionSingleton::SubjectType &rCaller,
                          Gui::SelectionSingleton::MessageType Reason);

    SoDirectionalLight* getBacklight(void) const;
    void setBacklight(SbBool on);
    SbBool isBacklight(void) const;
    void setSceneGraph (SoNode *root);

    void setAnimationEnabled(const SbBool enable);
    SbBool isAnimationEnabled(void) const;

    void setPopupMenuEnabled(const SbBool on);
    SbBool isPopupMenuEnabled(void) const;

    void startAnimating(const SbVec3f& axis, float velocity);
    void stopAnimating(void);
    SbBool isAnimating(void) const;

    void setFeedbackVisibility(const SbBool enable);
    SbBool isFeedbackVisible(void) const;

    void setFeedbackSize(const int size);
    int getFeedbackSize(void) const;

    void setRenderFramebuffer(const SbBool enable);
    SbBool isRenderFramebuffer() const;
    void renderToFramebuffer(QGLFramebufferObject*);

    virtual void setViewing(SbBool enable);
    virtual void setCursorEnabled(SbBool enable);

    void addGraphicsItem(GLGraphicsItem*);
    void removeGraphicsItem(GLGraphicsItem*);
    std::list<GLGraphicsItem*> getGraphicsItems() const;
    std::list<GLGraphicsItem*> getGraphicsItemsOfType(const Base::Type&) const;
    void clearGraphicsItems();

    /** @name Handling of view providers */
    //@{
    SbBool hasViewProvider(ViewProvider*) const;
    /// adds an ViewProvider to the view, e.g. from a feature
    void addViewProvider(ViewProvider*);
    /// remove a ViewProvider
    void removeViewProvider(ViewProvider*);
    /// get view provider by path
    ViewProvider* getViewProviderByPath(SoPath*) const;
    ViewProvider* getViewProviderByPathFromTail(SoPath*) const;
    /// get all view providers of given type
    std::vector<ViewProvider*> getViewProvidersOfType(const Base::Type& typeId) const;
    /// set the ViewProvider in special edit mode
    SbBool setEditingViewProvider(Gui::ViewProvider* p, int ModNum=0);
    /// return whether a view provider is edited
    SbBool isEditingViewProvider() const;
    /// reset from edit mode
    void resetEditingViewProvider();
    /// display override mode
    void setOverrideMode(const std::string &mode);
    void updateOverrideMode(const std::string &mode);
    std::string getOverrideMode() {return overrideMode;}
    //@}

    /** @name Making pictures */
    //@{
    /**
     * Creates an image with width \a w and height \a h of the current scene graph
     * and exports the rendered scenegraph to an image.
     */
    void savePicture(int w, int h, int eBackgroundType, QImage&) const;
    void saveGraphic(int pagesize, int eBackgroundType, SoVectorizeAction* va) const;
    //@}
    /**
     * Writes the current scenegraph to an Inventor file, either in ascii or binary. 
     */
    bool dumpToFile(const char* filename, bool binary) const;

    /** @name Selection methods */
    //@{
    void startSelection(SelectionMode = Lasso);
    void stopSelection();
    bool isSelecting() const;
    std::vector<SbVec2f> getGLPolygon(SbBool* clip_inner=0) const;
    std::vector<SbVec2f> getGLPolygon(const std::vector<SbVec2s>&) const;
    const std::vector<SbVec2s>& getPolygon(SbBool* clip_inner=0) const;
    //@}

    /** @name Edit methods */
    //@{
    void setEditing(SbBool edit);
    SbBool isEditing() const { return this->editing; }
    void setEditingCursor (const SoQtCursor& cursor);
    void setEditingCursor (const QCursor& cursor);
    void setRedirectToSceneGraph(SbBool redirect) { this->redirected = redirect; }
    SbBool isRedirectedToSceneGraph() const { return this->redirected; }
    void setRedirectToSceneGraphEnabled(SbBool enable) { this->allowredir = enable; }
    SbBool isRedirectToSceneGraphEnabled(void) const { return this->allowredir; }
    //@}

    /** @name Pick actions */
    //@{
    // calls a PickAction on the scene graph
    bool pickPoint(const SbVec2s& pos,SbVec3f &point,SbVec3f &norm) const;
    SoPickedPoint* pickPoint(const SbVec2s& pos) const;
    const SoPickedPoint* getPickedPoint(SoEventCallback * n) const;
    SbBool pubSeekToPoint(const SbVec2s& pos);
    void pubSeekToPoint(const SbVec3f& pos);
    //@}

    /**
     * Set up a callback function \a cb which will be invoked for the given eventtype. 
     * \a userdata will be given as the first argument to the callback function. 
     */
    void addEventCallback(SoType eventtype, SoEventCallbackCB * cb, void* userdata = 0);
    /**
     * Unregister the given callback function \a cb.
     */
    void removeEventCallback(SoType eventtype, SoEventCallbackCB * cb, void* userdata = 0);

    /** @name Clipping plane, near and far plane */
    //@{
    /** Returns the view direction from the user's eye point in direction to the
     * viewport which is actually the negative normal of the near plane.
     * The vector is normalized to length of 1.
     */
    SbVec3f getViewDirection() const;
    /** Returns the up direction */
    SbVec3f getUpDirection() const;
    /** Returns the orientation of the camera. */
    SbRotation getCameraOrientation() const; 
    /** Returns the 3d point on the focal plane to the given 2d point. */
    SbVec3f getPointOnScreen(const SbVec2s&) const;
    /** Returns the near plane represented by its normal and base point. */
    void getNearPlane(SbVec3f& rcPt, SbVec3f& rcNormal) const;
    /** Returns the far plane represented by its normal and base point. */
    void getFarPlane(SbVec3f& rcPt, SbVec3f& rcNormal) const;
    /** Adds or remove a manipulator to/from the scenegraph. */
    void toggleClippingPlane();
    /** Checks whether a clipping plane is set or not. */
    bool hasClippingPlane() const;
    /** Project the given normalized 2d point onto the near plane */
    SbVec3f projectOnNearPlane(const SbVec2f&) const;
    /** Project the given normalized 2d point onto the far plane */
    SbVec3f projectOnFarPlane(const SbVec2f&) const;
    //@}
    
    /** @name Dimension controls
     * the "turn*" functions are wired up to parameter groups through view3dinventor.
     * don't call them directly. instead set the parameter groups.
     * @see TaskDimension
     */
    //@{
    void turnAllDimensionsOn();
    void turnAllDimensionsOff();
    void turn3dDimensionsOn();
    void turn3dDimensionsOff();
    void turnDeltaDimensionsOn();
    void turnDeltaDimensionsOff();
    void eraseAllDimensions();
    void addDimension3d(SoNode *node);
    void addDimensionDelta(SoNode *node);
    //@}
    
    /** @name Anti-Aliasing Control
     * the anti-aliasing mode is controled by parameters through view3dinventor.
     * don't call them directly. Instead set the parameter View/AntiAliasing.
     */
    //@{
    void setAntiAliasingMode(AntiAliasing mode);
    AntiAliasing getAntiAliasingMode() const;
    //@}

    /**
     * Set the camera's orientation. If isAnimationEnabled() returns
     * \a TRUE the reorientation is animated, otherwise its directly
     * set.
     */
    void setCameraOrientation(const SbRotation& rot, SbBool moveTocenter=false);
    void setCameraType(SoType t);
    void moveCameraTo(const SbRotation& rot, const SbVec3f& pos, int steps, int ms);
    /** 
     * Zooms the viewport to the size of the bounding box. 
     */
    void boxZoom(const SbBox2s&);
    /**
     * Reposition the current camera so we can see the complete scene.
     */
    void viewAll();
    void viewAll(float factor);
    /**
     * Reposition the current camera so we can see all selected objects 
     * of the scene. Therefore we search for all SOFCSelection nodes, if
     * none of them is selected nothing happens.
     */
    void viewSelection();

    void setGradientBackground(bool b);
    bool hasGradientBackground() const;
    void setGradientBackgroundColor(const SbColor& fromColor,
                                    const SbColor& toColor);
    void setGradientBackgroundColor(const SbColor& fromColor,
                                    const SbColor& toColor,
                                    const SbColor& midColor);
    void setEnabledFPSCounter(bool b);
    void setNavigationType(Base::Type);

    void setAxisCross(bool b);
    bool hasAxisCross(void);

    NavigationStyle* navigationStyle() const;

    void setDocument(Gui::Document *pcDocument);

protected:
    void renderScene();
    void renderFramebuffer();
    void animatedViewAll(int steps, int ms);
    virtual void actualRedraw(void);
    virtual void setSeekMode(SbBool enable);
    virtual void afterRealizeHook(void);
    virtual void processEvent(QEvent * event);
    virtual SbBool processSoEvent(const SoEvent * const ev);
    SbBool processSoEventBase(const SoEvent * const ev);
    void printDimension();
    void selectAll();

    static void clearBuffer(void * userdata, SoAction * action);
    static void setGLWidget(void * userdata, SoAction * action);
    static void handleEventCB(void * userdata, SoEventCallback * n);
    static void interactionStartCB(void * data, SoQtViewer * viewer);
    static void interactionFinishCB(void * data, SoQtViewer * viewer);
    static void interactionLoggerCB(void * ud, SoAction* action);

private:
    static void selectCB(void * closure, SoPath * p);
    static void deselectCB(void * closure, SoPath * p);
    static SoPath * pickFilterCB(void * data, const SoPickedPoint * pick);
    void initialize();
    void drawAxisCross(void);
    static void drawArrow(void);
    void setCursorRepresentation(int mode);


private:
    std::set<ViewProvider*> _ViewProviderSet;
    std::map<SoSeparator*,ViewProvider*> _ViewProviderMap;
    std::list<GLGraphicsItem*> graphicsItems;
    ViewProvider* editViewProvider;
    SoFCBackgroundGradient *pcBackGround;
    SoSeparator * backgroundroot;
    SoSeparator * foregroundroot;
    SoDirectionalLight* backlight;

    SoSeparator * pcViewProviderRoot;
    SoEventCallback* pEventCallback;
    NavigationStyle* navigation;
    SoFCUnifiedSelection* selectionRoot;
    QGLFramebufferObject* framebuffer;
    SoSwitch *dimensionRoot;

    // small axis cross in the corner
    SbBool axiscrossEnabled;
    int axiscrossSize;
    // big one in the middle
    SoShapeScale* axisCross;
    SoGroup* axisGroup;


    SbBool editing;
    QCursor editCursor;
    SbBool redirected;
    SbBool allowredir;

    std::string overrideMode;

    // friends
    friend class NavigationStyle;
    friend class GLPainter;
};

} // namespace Gui

#endif  // GUI_VIEW3DINVENTORVIEWER_H