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//=============================================================================
//
//                               OpenFlipper
//        Copyright (C) 2008 by Computer Graphics Group, RWTH Aachen
//                           www.openflipper.org
//
//-----------------------------------------------------------------------------
//
//                                License
//
//  OpenFlipper is free software: you can redistribute it and/or modify
//  it under the terms of the GNU Lesser General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  OpenFlipper 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 Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public License
//  along with OpenFlipper.  If not, see <http://www.gnu.org/licenses/>.
//
//-----------------------------------------------------------------------------
//
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//   $Revision$
//   $Author$
//   $Date$
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//
//=============================================================================




//=============================================================================
//
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//  CLASS glViewer
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//
//=============================================================================

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#ifndef BASEVIEWER_HH
#define BASEVIEWER_HH
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//== INCLUDES =================================================================

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#include <OpenFlipper/common/Types.hh>
#include <OpenFlipper/common/ViewerProperties.hh>
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#include <ACG/GL/GLState.hh>
#include <ACG/Scenegraph/SceneGraph.hh>
#include <ACG/QtWidgets/QtSceneGraphWidget.hh>

#include <QtOpenGL/QGLFormat>
#include <QBoxLayout>
#include <QtNetwork/QUdpSocket>
#include <QWheelEvent>
#include <QKeyEvent>
#include <QDropEvent>
#include <QContextMenuEvent>
#include <QDragEnterEvent>
#include <QMouseEvent>
#include <QAction>
#include <QSize>
#include <QMap>
#include <QString>
#include <QMenu>
#include <QToolBar>
#include <QTime>
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#include <QGraphicsWidget>
#include <QGraphicsSceneDragDropEvent>
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#include <vector>
#include <string>


//== FORWARDDECLARATIONS ======================================================


class QPushButton;
class QToolButton;
class QStatusBar;
class QSplitter;
class QTimer;
class QImage;
class QSocketNotifier;


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

//== FORWARDDECLARATIONS ======================================================

namespace ACG {
  namespace QtWidgets {
    class QtWheel;
  }
}
class QtGLGraphicsScene;
class QtGLGraphicsView;
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class QtGLViewerLayout;
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class QtShiftPopupMenu;


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


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/** \class glViewer QtBaseViewer.hh <OpenFlipper/widgets/glWidget/QtBaseViewer.hh>
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    Base Viewer Widget: All viewers are derived from this one. Implements
    Mouse & Keyboard Events.
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 **/

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class DLLEXPORT glViewer : public QGraphicsWidget
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{
Q_OBJECT

//-------------------------------------------------------------- public methods
public:

  //--------------------------------------------------- constructor / destructor

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  /** Create a glViewer.
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    \param _parent parent widget
    \param _name name (qt internal, qt debugging)
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    \param _properties viewerOptions controlled by PluginFunctions
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    \param _id examiner id
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    \param _statusBar pointer to an existing status bar for this widget,
     if \c statusBar==0 then a \a private status bar will be created
    \param _format OpenGL context settings, will be passed to glarea()
  */
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  glViewer( QtGLGraphicsScene* _scene,
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            QGLWidget* _glWidget,
            Viewer::ViewerProperties& _properties,
            unsigned int _id,
            QGraphicsWidget* _parent=0,
            const char* _name=0,
            QStatusBar *_statusBar=0);
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  /// Destructor.
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  virtual ~glViewer();
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  //------------------------------------------------------------- public methods

  virtual QSize sizeHint () const;

  /** Set status bar.
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      Sets the \c QStatusBar widget that is used for information
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      output, e.g. the frame rate of the rotation animation.
  */
  void setStatusBar(QStatusBar* _sb);

  /// Makes this widget the current widget for OpenGL operations.
  virtual void makeCurrent();
  /// Swaps the screen contents with the off-screen buffer.
  virtual void swapBuffers();

  /// Lock update of projection matrix.
  void lockProjectionUpdate( void ) { projectionUpdateLocked_ = true; }

  /// Unlock update of projection matrix.
  void unlockProjectionUpdate( void ) { projectionUpdateLocked_ = false; }

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  signals :
    void functionMenuUpdate();
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  public:
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  /// Enable/disable mouse tracking (move events with no button press)
  void trackMouse(bool _track);
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  /** Set scene graph.
      Sets the scene graph to the the graph rooted at \c _root.
      The available draw modes in the scene graph will be collected
      and the popup menu will be updated.<br>
      The \c sceneGraphToched() signal will be emitted (even if
      \c _root does not actually change).
  */
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  void sceneGraph(ACG::SceneGraph::BaseNode* _root, const bool _setCenter = false);
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   /// projection mode
  enum ProjectionMode {
    ORTHOGRAPHIC_PROJECTION, //!< orthographic
    PERSPECTIVE_PROJECTION   //!< perspective
  };

  /// Changes the projection mode and updates the projection matrix.
  void projectionMode(ProjectionMode _p);
  /// get current projection mode
  ProjectionMode projectionMode() const { return projectionMode_; }


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  /** Sets the center and dimension of the whole scene.  This point is
      used as fixpoint for rotations and to set the eye point far
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      enough from the scene so that the whole scene is visible.
    */
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  void setScenePos( const ACG::Vec3d& _center, double _radius, const bool _setCenter = false );

  /**
   * Set new center point of scene
   */
  void setSceneCenter( const ACG::Vec3d& _center );

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  /** Get scene's center
      \see setScenePos()
  */
  const ACG::Vec3d& scene_center() const { return scene_center_; }
  /** Get scene's radius
      \see setScenePos()
  */
  double scene_radius() const { return scene_radius_; }


  /// set the viewing direction
  void viewingDirection( const ACG::Vec3d& _dir, const ACG::Vec3d& _up );

  /// Automatically normalize normals?
  enum NormalsMode {
    /// use provided normals as is
    DONT_TOUCH_NORMALS,
    /** Automatically normalize normals.
        Input normals are not normalized \a or the transformation matrix
	does scaling or shearing.
     */
    NORMALIZE_NORMALS
  };

  /// set treatment of normals
  void normalsMode(NormalsMode _mode);
  /// get treatment of normals
  NormalsMode normalsMode() const { return normalsMode_; }


  /// get light rotation matrix
  ACG::GLMatrixd& light_matrix() { return light_matrix_; }
  /// rotete light sources
  void rotate_lights(ACG::Vec3d& _axis, double _angle);
  /// update light position
  void update_lights();

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  void draw_lights();

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  /// copy current framebuffer to an QImage
  void copyToImage( QImage& _image, GLenum _buffer=GL_BACK) {
    copyToImage(_image, 0, 0, glWidth(), glHeight(), _buffer);
  }

  /// copy current framebuffer to an QImage
  void copyToImage( QImage& _image,
		    unsigned int _left,  unsigned int _top,
		    unsigned int _width, unsigned int _height,
		    GLenum _buffer );


  /// get width of QGLWidget
  unsigned int glWidth() const;
  /// get height of QGLWidget
  unsigned int glHeight() const;
  /// get size of QGLWIdget
  QSize glSize() const;
  /// map global to glarea coords
  QPoint glMapFromGlobal( const QPoint& _pos ) const;
  /// map glarea coords to global coords
  QPoint glMapToGlobal( const QPoint& _pos ) const;

  /// convert current view to text representation
  void encodeView(QString& _view);
  /** Decode and apply text representation of view encoded by encodeView().
      If \c _view was successfully decoded it will immediately be applied
      and \c true is returned, \c false is returned else.
   */
  bool decodeView(const QString& _view);

  /// initialize modelview matrix to identity
  void initModelviewMatrix();

  // get all Mouse & Key Events for GlWidget
  void grabGLArea();

  // undo grabbing GLArea
  void releaseGLArea();

  /// One or two pass Drawing
  void drawBlendedObjects(bool _status) { blending_ = _status; }

  /// translate the scene and update modelview matrix
  void translate(const ACG::Vec3d& trans);

  /// rotate the scene (around its center) and update modelview matrix
  void rotate(const ACG::Vec3d& axis, double angle)
  { rotate(axis, angle, trackball_center_); }

  /// rotate the scene and update modelview matrix
  void rotate(const ACG::Vec3d& axis, double angle, const ACG::Vec3d& _center);

//---------------------------------------------------------------- public slots
public slots:

  /// Redraw scene. Triggers paint event for updating the view (cf. drawNow()).
  virtual void updateGL();

  /// set home position
  virtual void setHome();
  /// go to home pos
  virtual void home();
  /// view the whole scene
  virtual void viewAll();
  /// Fly to. Get closer if \c _move_back=\c false, get more distant else.
  virtual void flyTo(const QPoint& _pos, bool _move_back);
  /// Fly to, get closer.
  virtual void flyTo(const QPoint& _pos) { flyTo(_pos,false); }
  /// Fly to, get more distant.
  virtual void flyFrom(const QPoint& _pos) { flyTo(_pos,true); }

  /**  Fly to point and set new viewing direction (animated).
   * @param _position New viewer position ( the new eye point of the viewer )
   * @param _center   The new scene center ( the point we are looking at )
   * @param _time     Animation time in ms
   */
  virtual void flyTo(const ACG::Vec3d& _position,
		               const ACG::Vec3d& _center,
		               double       _time = 1000.0);

  /// set perspective view (projectionMode(PERSPECTIVE_PROJECTION))
  virtual void perspectiveProjection();
  /// set orthographic view (projectionMode(ORTHOGRAPHIC_PROJECTION))
  virtual void orthographicProjection();
  /// toggle projection mode
  virtual void toggleProjectionMode();

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  signals:

    void projectionModeChanged( bool _ortho );

  public slots:
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  /// set view, used for synchronizing
  virtual void setView( const ACG::GLMatrixd& _modelview,
			               const ACG::GLMatrixd& _inverse_modelview );

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  void actionPasteView();
  void actionCopyView();

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//-------------------------------------------------------------- public signals
signals:

  /** A signal for giving mouse events to the application.
      This is done if the Pick-Button (top-most button of the toolbar)
      is activated. Connect to this signal to implement application
      specific handling of mouse events.<br>
      \a Notes:
      \arg You have to test for the QMouseEvent::type() of the
      event yourself (press/release/move)!
      \arg signalMouseEventIdentify() is emitted on button press if
      actionMode()==Question.
  */
  void signalMouseEvent(QMouseEvent*, const std::string&);

  /// This signal does not send the pick mode and is kept for compatibility
  void signalMouseEvent(QMouseEvent*);

  /// Emitted in Pick mode. Uses pick mode.
  void signalWheelEvent(QWheelEvent*, const std::string&);

  /** Emitted instead o signalMouseEvent() if actionMode()==Question
      and \c _event is a mouse press event.
   */
  void signalMouseEventIdentify( QMouseEvent* );

  /// scene graph has changed
  void signalSceneGraphChanged(ACG::SceneGraph::BaseNode* _root);
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  signals:

  /** If popups are disabled context menu mode is set to custom Menu and the signal is passed
   * from the QGLWidget to this signal. You can use mapToGlobal for mapping this point to
   * global coords.
   */
  void signalCustomContextMenuRequested ( const QPoint & );


//----------------------------------------------------------- protected methods
protected:

  friend class QtGLGraphicsScene;
  friend class QtGLGraphicsView;

  /// initialize OpenGL states
  virtual void initializeGL();
  /// draw the scene. Triggered by updateGL().
  virtual void paintGL();
  /// handle resize events
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  virtual void resizeEvent(QGraphicsSceneResizeEvent * _e);
  /// handle move events
  virtual void moveEvent (QGraphicsSceneMoveEvent * _e);
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  /// handle mouse press events
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  virtual void mousePressEvent(QGraphicsSceneMouseEvent* _event);
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  /// handle mouse double click events
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  virtual void mouseDoubleClickEvent(QGraphicsSceneMouseEvent* _event);
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  /// handle mouse move events
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  virtual void mouseMoveEvent(QGraphicsSceneMouseEvent* _event);
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  /// handle mouse release events
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  virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent* _event);
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  /// handle mouse wheel events
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  virtual void wheelEvent(QGraphicsSceneWheelEvent* _event);
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  /// handle mouse press events
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  virtual void contextMenuEvent(QGraphicsSceneContextMenuEvent* _e);
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  /// specialized viewer: hande mouse events
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  void viewMouseEvent( QMouseEvent* _event);
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  /// specialized viewer: handle wheel events
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  void viewWheelEvent(QWheelEvent* _event);
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  /// optional: hande mouse events to rotate light
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  void lightMouseEvent( QMouseEvent* /* _event */ );
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  protected:


  /// updates projection matrix
  void updateProjectionMatrix();


//------------------------------------------------------------- protected slots
protected slots:

  /// process signals from wheelX_
  virtual void slotWheelX(double _dAngle);
  /// process signals from wheelX_
  virtual void slotWheelY(double _dAngle);
  /// process signals from wheelZ_
  virtual void slotWheelZ(double _dist);

  /// correct ??? (same function as in qt src)
  virtual void cleanupEventFilter()
  { removeEventFilter( sender());}

//----------------------------------------------------------- private functions
private:

  /// Copy constructor. Never used!
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  glViewer(const glViewer&);
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  /// Assignment operator. Never used!
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  glViewer& operator=(const glViewer&);
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  // create widgets
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  void createWidgets(QStatusBar* _sb);
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  /* Recursively draws each node in the scene graph.
      Called by paintGL(). */
  void drawScene();
  // helper called by drawScene().
  void drawScene_mono();
  // helper called by drawScene() when stereo viewing is active.
  void drawScene_stereo();

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  // helper called by drawScene_stereo() when opengl stereo viewing is active.
  void drawScene_glStereo();

  // helper called by drawScene_stereo() when anaglyph stereo viewing is active.
  void drawScene_anaglyphStereo();

  // helper called by drawScene_stereo() when custom anaglyph stereo viewing is active.
  void drawScene_customAnaglyphStereo();

  // helper called to initialize/update custom anaglyph stereo
  void updateCustomAnaglyphStereo();

  // helper called to cleanup custom anaglyph stereo
  void finiCustomAnaglyphStereo();

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//-------------------------------------------------------------- protected data
protected:


  // scene center and radius
  ACG::Vec3d                   scene_center_, trackball_center_;
  double                       scene_radius_, trackball_radius_;


  // projection stuff
  GLdouble                     orthoWidth_;
  GLdouble                     near_, far_, fovy_;

  // helper
  bool                         isRotating_;

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  // current status bar
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  QStatusBar* statusbar_;


//---------------------------------------------------------------- private data
private:


  // data stored for home view
  ACG::Vec3d                   home_center_;
  double                       home_radius_;
  ACG::GLMatrixd               home_modelview_,
                               home_inverse_modelview_;
  double                       homeOrthoWidth_;


  // matrix for rotating light position
  ACG::GLMatrixd               light_matrix_;


  // modi
  NormalsMode                  normalsMode_;
  ProjectionMode               projectionMode_;
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  // helper
  bool                         trackMouse_;
  bool                         glareaGrabbed_;
  double                       frame_time_;


  // scenegraph stuff
  ACG::SceneGraph::BaseNode*   sceneGraphRoot_;

  bool                         projectionUpdateLocked_;
  bool                         blending_;

  // graphics scene used to paint gl context and widgets
  QtGLGraphicsScene* glScene_;

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  // gl widget used as drawing area to paint the graphics scene
  QGLWidget* glWidget_;

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  // Base graphics widget layout
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  QtGLViewerLayout* glBaseLayout_;
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  // examiner id
  unsigned int id_;

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  // vector of current draw mode actions
  std::vector< QAction * > drawMenuActions_;

  // Used to calculate the time passed between redraws
  QTime redrawTime_;

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  //===========================================================================
  /** @name Wheels
   * @{ */
  //===========================================================================

  public:
    bool wheelsVisible();

  public slots:
    void slotShowWheels();
    void slotHideWheels();

  private:
    // rotate around x-axis
    ACG::QtWidgets::QtWheel* wheelX_;
    // rotate around y-axis
    ACG::QtWidgets::QtWheel* wheelY_;
    // translate along z-axis
    ACG::QtWidgets::QtWheel* wheelZ_;


  /** @} */

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  //===========================================================================
  /** @name view handling
   * @{ */
  //===========================================================================
  signals:
    void viewUpdated();

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  /** @} */

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  //===========================================================================
  /** @name Stereo
   * @{ */
  //===========================================================================

  public slots:

    /// enable/disable stereo mode
    virtual void setStereoMode(bool _b);

  private:
    // stereo stuff
    bool                         stereo_;

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    // custom anaglyph stuff
    int    agTexWidth_;
    int    agTexHeight_;
    GLuint agTexture_[2];
    GLuint agProgram_;
    bool   customAnaglyphSupported_;

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  /** @} */


  //===========================================================================
  /** @name Key handling
   * @{ */
  //===========================================================================

  signals:
    /** \brief Key Event received
     *
     * This signal is emitted if a Key press event is received which is not handled by
     * the widget itself. If internal key handling is disabled the events are passed to
     * the parent of this widget.
     */
    void signalKeyPressEvent(QKeyEvent*);

  protected:

    /** \brief Get keyPress events from the glArea
     *
     * This function is called by the internal gl widget when receiving a key press event.
     */
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    virtual void keyPressEvent(QKeyEvent* _event) { _event->ignore(); };
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    /** \brief Get keyRelease events from the glArea
     *
     * This function is called by the internal gl widget when receiving a key release event.
     * Here these events are simply passed to the parent widget.
     *
     */
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    virtual void keyReleaseEvent(QKeyEvent* _event) { _event->ignore(); };
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    /** \brief Handle key events in view mode
     *
     * This funtion is called by the BaseViewer if a key press event occured in view mode.
     * This function has to be implemented by every viewer!
     *
     * @return If the derived class handled the event it has to return true otherwise false
     */
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    virtual bool viewKeyPressEvent(QKeyEvent* /*_event*/) { return false; };
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  /** @} */

  //===========================================================================
  /** @name Drag and Drop
   * @{ */
  //===========================================================================

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  public:
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    /// drag & drop for modelview copying
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    virtual void dragEnterEvent(QGraphicsSceneDragDropEvent* _e);

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    /// drag & drop for modelview copying
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    virtual void dropEvent(QGraphicsSceneDragDropEvent* _e);
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  signals:
    /** Signal is emitted when Control modifier is pressed and mouse moded.
     * It will only be emitted if in externalDragMode ( see setExternalDrag )
     */
    void startDragEvent( QMouseEvent* _event );

    /** Signal is emitted only if in externalDragMode ( see setExternalDrag )
     * It will be send if a drag enters the gl widget.
     */
    void dragEnterEvent(QDragEnterEvent* _event);

    /** Signal is emitted only if in externalDragMode ( see setExternalDrag )
     * It will be send if a drop occurs in the gl widget.
     */
    void dropEvent( QDropEvent* _event );


  /** @} */

  //===========================================================================
  /** @name Snapshots
   * @{ */
  //===========================================================================

  public slots:


    /** Trigger a snapshot and increase the snapshot counter.
        Save snapshot to file determined by snapshotBaseFileName() and
        the current snapshot counter. The \a back buffer will be saved.
    */
    virtual void snapshot();

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    /// Take a snapshot and store it in the given image
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    virtual void snapshot(QImage& _image, bool _offScreenRendering = false);
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  /** @} */

  //===========================================================================
  /** @name Picking
   * @{ */
  //===========================================================================
  public:
    /** Apply pick action. <br>
     *   Information about the picked primitive is stored in the
     *   provided pointers. No information is stored if 0-pointers
     *   are given. Resulting values are defined only if \c true
     *   has been returned!<br>
     *
     * @param _pickTarget Select what should be picked: Faces/Vertices/...
     * @param _mousePos   The position to be used for picking
     * @param _nodeIdx    If picking is successfull this will contain the id of the scenegraph node picked.
     * @param _targetIdx  Special index defined by the picked Node. E.g. Facehandle/VertexHandle/.. for MeshNodes
     * @param _hitPointPtr Pointer to 3D point from picking
     * @return Successfull?
     */
    bool pick( ACG::SceneGraph::PickTarget _pickTarget,
               const QPoint& _mousePos,
               unsigned int& _nodeIdx,
               unsigned int& _targetIdx,
               ACG::Vec3d*   _hitPointPtr=0 );

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    /** Apply pick action. <br>
     *   Picks all objects in the given Region. Information about the picked primitives is stored in the
     *   provided list. Resulting values are defined only if \c true
     *   has been returned!
     *  <br>
     *
     * @param _pickTarget Select what should be picked: Faces/Vertices/...
     * @param _region     Area for picking
     * @param _list       List of found scenegraph objects (node/target pairs)
     * @return Successfull?
     */
    bool pick_region( ACG::SceneGraph::PickTarget                _pickTarget,
                      const QRegion&                             _region,
                      QList<QPair<unsigned int, unsigned int> >& _list);

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    /** get the coordinates of the picked point by z-buffer re-projection
     * @param _mousePos The position to pick
     * @param _hitPoint The point returned by the reprojection
     * @return Successfull?
     */
    bool fast_pick( const QPoint&  _mousePos,
                    ACG::Vec3d&    _hitPoint );

  private:

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    /// pick using colors
    int pickColor( ACG::SceneGraph::PickTarget _pickTarget,
                   const QPoint& _mousePos,
                   unsigned int& _nodeIdx,
                   unsigned int& _targetIdx,
                   ACG::Vec3d*   _hitPointPtr=0 );

    /// pick using selection buffer
    bool pickGL( ACG::SceneGraph::PickTarget _pickTarget,
                 const QPoint& _mousePos,
                 unsigned int& _nodeIdx,
                 unsigned int& _targetIdx,
                 ACG::Vec3d*   _hitPointPtr=0 );

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  /** @} */
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  //===========================================================================
  /** @name Merge from examiner
   * @{ */
  //===========================================================================

  public:

  /// Lock scene rotation
  void allowRotation( bool _mode ) { allowRotation_ = _mode; };


  private slots:

    void slotAnimation();

  protected:

    // mouse interaction
    QPoint   lastPoint2D_;

  private:

    /// virtual trackball: map 2D screen point to unit sphere
    bool mapToSphere(const QPoint& _p, ACG::Vec3d& _result) const;


    // mouse interaction
    ACG::Vec3d    lastPoint3D_;
    bool          lastPoint_hitSphere_;
    bool          allowRotation_;

    // animation stuff
    ACG::Vec3d                   lastRotationAxis_;
    double                       lastRotationAngle_;
    QTime                        lastMoveTime_;
    QTimer*                      timer_;

    /** @} */
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  //===========================================================================
  /** @name Viewer State
   * @{ */
  //===========================================================================

  public:
    /// Returns a pointer to the Viewer Status
    Viewer::ViewerProperties* properties(){ return &properties_; };

  private:
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    /// All properties for this viewer
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    Viewer::ViewerProperties& properties_;
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    /// Gl State
    ACG::GLState                 *glstate_;

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  private slots:
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    /** Called when properties for the viewer require a redraw
     * The slot will trigger the redraw after setting the right properties.
     */
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    void slotPropertiesUpdated();

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  private:
    /** This will apply all properties without redrawing
     *  You have to set the context yourself!
     */
    void applyProperties();

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  /** @} */
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};


//=============================================================================
//=============================================================================
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#endif // BASEVIEWER_HH defined
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//=============================================================================