/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkParallelopipedRepresentation.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
/**
 * @class   vtkParallelopipedRepresentation
 * @brief   Default representation for vtkParallelopipedWidget
 *
 * This class provides the default geometrical representation for
 * vtkParallelopipedWidget. As a result of interactions of the widget, this
 * representation can take on of the following shapes:
 * <p>1) A parallelopiped. (8 handles, 6 faces)
 * <p>2) Paralleopiped with a chair depression on any one handle. (A chair
 * is a depression on one of the handles that carves inwards so as to allow
 * the user to visualize cuts in the volume). (14 handles, 9 faces).
 *
 * @sa
 * vtkParallelopipedWidget
*/

#ifndef vtkParallelopipedRepresentation_h
#define vtkParallelopipedRepresentation_h

#include "vtkInteractionWidgetsModule.h" // For export macro
#include "vtkWidgetRepresentation.h"

class vtkActor;
class vtkPlane;
class vtkPoints;
class vtkPolyData;
class vtkPolyDataMapper;
class vtkProperty;
class vtkCellArray;
class vtkTransform;
class vtkHandleRepresentation;
class vtkClosedSurfacePointPlacer;
class vtkPlaneCollection;
class vtkParallelopipedTopology;

class VTKINTERACTIONWIDGETS_EXPORT vtkParallelopipedRepresentation
                              : public vtkWidgetRepresentation
{
public:
  /**
   * Instantiate the class.
   */
  static vtkParallelopipedRepresentation *New();

  //@{
  /**
   * Standard methods for instances of this class.
   */
  vtkTypeMacro(vtkParallelopipedRepresentation,vtkWidgetRepresentation);
  void PrintSelf(ostream& os, vtkIndent indent) override;
  //@}

  /**
   * Methods to satisfy the superclass.
   */
  void GetActors(vtkPropCollection *pc) override;

  //@{
  /**
   * Place the widget in the scene. You can use either of the two APIs :
   * 1) PlaceWidget( double bounds[6] )
   * Creates a cuboid conforming to the said bounds.
   * 2) PlaceWidget( double corners[8][3] )
   * Creates a parallelopiped with corners specified. The order in
   * which corners are specified must obey the following rule:
   * Corner 0 - 1 - 2 - 3 - 0  forms a face
   * Corner 4 - 5 - 6 - 7 - 4  forms a face
   * Corner 0 - 4 - 5 - 1 - 0  forms a face
   * Corner 1 - 5 - 6 - 2 - 1  forms a face
   * Corner 2 - 6 - 7 - 3 - 2  forms a face
   * Corner 3 - 7 - 4 - 0 - 3  forms a face
   */
  virtual void PlaceWidget(double corners[8][3]);
  void PlaceWidget(double bounds[6]) override;
  //@}

  //@{
  /**
   * The interaction state may be set from a widget (e.g., PointWidget)
   * or other object. This controls how the interaction with the
   * widget proceeds.
   */
  vtkSetMacro(InteractionState,int);
  //@}

  /**
   * Get the bounding planes of the object. The first 6 planes will
   * be bounding planes of the parallelopiped. If in chair mode, three
   * additional planes will be present. The last three planes will be those
   * of the chair. The normals of all the planes will point into the object.
   */
  void GetBoundingPlanes( vtkPlaneCollection *pc );

  /**
   * The parallelopiped polydata.
   */
  void GetPolyData(vtkPolyData *pd);

  /**
   * The parallelopiped polydata.
   */
  double *GetBounds() override;

  //@{
  /**
   * Set/Get the handle properties.
   */
  virtual void SetHandleProperty           (vtkProperty *);
  virtual void SetHoveredHandleProperty    (vtkProperty *);
  virtual void SetSelectedHandleProperty   (vtkProperty *);
  vtkGetObjectMacro(HandleProperty,         vtkProperty  );
  vtkGetObjectMacro(HoveredHandleProperty,  vtkProperty  );
  vtkGetObjectMacro(SelectedHandleProperty, vtkProperty  );
  //@}

  void SetHandleRepresentation(vtkHandleRepresentation *handle);
  vtkHandleRepresentation* GetHandleRepresentation(int index);

  //@{
  /**
   * Turns the visibility of the handles on/off. Sometimes they may get in
   * the way of visualization.
   */
  void HandlesOn();
  void HandlesOff();
  //@}

  //@{
  /**
   * Get the face properties. When a face is being translated, the face gets
   * highlighted with the SelectedFaceProperty.
   */
  vtkGetObjectMacro(FaceProperty,vtkProperty);
  vtkGetObjectMacro(SelectedFaceProperty,vtkProperty);
  //@}

  //@{
  /**
   * Get the outline properties. These are the properties with which the
   * parallelopiped wireframe is rendered.
   */
  vtkGetObjectMacro(OutlineProperty,vtkProperty);
  vtkGetObjectMacro(SelectedOutlineProperty,vtkProperty);
  //@}

  /**
   * This actually constructs the geometry of the widget from the various
   * data parameters.
   */
  void BuildRepresentation() override;

  //@{
  /**
   * Methods required by vtkProp superclass.
   */
  void ReleaseGraphicsResources(vtkWindow *w) override;
  int  RenderOverlay(vtkViewport *viewport) override;
  int  RenderOpaqueGeometry(vtkViewport *viewport) override;
  //@}

  /**
   * Given and x-y display coordinate, compute the interaction state of
   * the widget.
   */
  int ComputeInteractionState(int X, int Y, int modify=0) override;

  // Manage the state of the widget
  enum _InteractionState
  {
    Outside = 0,
    Inside,
    RequestResizeParallelopiped,
    RequestResizeParallelopipedAlongAnAxis,
    RequestChairMode,
    RequestTranslateParallelopiped,
    RequestScaleParallelopiped,
    RequestRotateParallelopiped,
    ResizingParallelopiped,
    ResizingParallelopipedAlongAnAxis,
    ChairMode,
    TranslatingParallelopiped,
    ScalingParallelopiped,
    RotatingParallelopiped
  };

  // Methods to manipulate the piped.
  virtual void Translate( double translation[3] );
  virtual void Translate( int X, int Y );
  virtual void Scale( int X, int Y );

  /**
   * Synchronize the parallelopiped handle positions with the
   * Polygonal datastructure.
   */
  virtual void PositionHandles();

  //@{
  /**
   * Minimum thickness for the parallelopiped. User interactions cannot make
   * any individual axis of the parallopiped thinner than this value.
   * Default is 0.05 expressed as a fraction of the diagonal of the bounding
   * box used in the PlaceWidget() invocation.
   */
  vtkSetMacro( MinimumThickness, double );
  vtkGetMacro( MinimumThickness, double );
  //@}

protected:
  vtkParallelopipedRepresentation();
  ~vtkParallelopipedRepresentation() override;

  /**
   * Translate the nth PtId (0 <= n <= 15) by the specified amount.
   */
  void TranslatePoint( int n, const double motionVector[3] );

  /**
   * Set the highlight state of a handle.
   * If handleIdx is -1, the property is applied to all handles.
   */
  void SetHandleHighlight( int handleIdx, vtkProperty *property );

  //@{
  /**
   * Highlight face defined by the supplied ptids with the specified property.
   */
  void SetFaceHighlight( vtkCellArray * face, vtkProperty * );
  void HighlightAllFaces();
  void UnHighlightAllFaces();
  //@}

  // Node can be a value within [0,7]. This will create a chair one one of
  // the handle corners. '0 < InitialChairDepth < 1' value dicates the starting
  // depth of the cavity.
  void UpdateChairAtNode( int node );

  // Removes any existing chairs.
  void RemoveExistingChairs();

  // Convenience method to get just the planes that define the parallelopiped.
  // If we aren't in chair mode, this will be the same as GetBoundingPlanes().
  // If we are in chair mode, this will be the first 6 planes from amongst
  // those returned by "GetBoundingPlanes".
  // All planes have their normals pointing inwards.
  void GetParallelopipedBoundingPlanes( vtkPlaneCollection * pc );

  // Convenience method to edefine a plane passing through 3 points.
  void DefinePlane( vtkPlane *, double p[3][3]);

  // Convenience method to edefine a plane passing through 3 pointIds of the
  // parallelopiped. The point Ids must like in the range [0,15], ie the
  // 15 points comprising the parallelopiped and the chair (also modelled
  // as a parallelopiped)
  void DefinePlane( vtkPlane *, vtkIdType, vtkIdType, vtkIdType);

  vtkActor                          * HexActor;
  vtkPolyDataMapper                 * HexMapper;
  vtkPolyData                       * HexPolyData;
  vtkPoints                         * Points;
  vtkActor                          * HexFaceActor;
  vtkPolyDataMapper                 * HexFaceMapper;
  vtkPolyData                       * HexFacePolyData;

  double                              LastEventPosition[2];

  // Cache the axis index used for face aligned resize.
  int                                 LastResizeAxisIdx;

  vtkHandleRepresentation           * HandleRepresentation;
  vtkHandleRepresentation          ** HandleRepresentations;
  int                                 CurrentHandleIdx;
  int                                 ChairHandleIdx;


  // When a chair is carved out for the first time, this is the initial
  // depth of the chair
  double                              InitialChairDepth;

  vtkProperty                       * HandleProperty;
  vtkProperty                       * HoveredHandleProperty;
  vtkProperty                       * FaceProperty;
  vtkProperty                       * OutlineProperty;
  vtkProperty                       * SelectedHandleProperty;
  vtkProperty                       * SelectedFaceProperty;
  vtkProperty                       * SelectedOutlineProperty;
  vtkClosedSurfacePointPlacer       * ChairPointPlacer;
  vtkParallelopipedTopology         * Topology;
  double                              MinimumThickness;
  double                              AbsoluteMinimumThickness;

private:
  vtkParallelopipedRepresentation(const vtkParallelopipedRepresentation&) = delete;
  void operator=(const vtkParallelopipedRepresentation&) = delete;
};

#endif