// Created on: 2011-10-14 
// Created by: Roman KOZLOV
// Copyright (c) 2011-2014 OPEN CASCADE SAS 
// 
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#ifndef __IVTKOCC_SHAPEPICKERALGO_H__
#define __IVTKOCC_SHAPEPICKERALGO_H__

#include <IVtk_IShapePickerAlgo.hxx>
#include <IVtkOCC_ViewerSelector.hxx>

class IVtkOCC_ShapePickerAlgo;
DEFINE_STANDARD_HANDLE( IVtkOCC_ShapePickerAlgo, IVtk_IShapePickerAlgo )

//! @class IVtkOCC_ShapePickerAlgo 
//! @brief OCC implementation of 3D shapes picking algorithm.
class IVtkOCC_ShapePickerAlgo : public IVtk_IShapePickerAlgo
{
public:
  typedef Handle(IVtkOCC_ShapePickerAlgo) Handle;

  //! Constructor
  Standard_EXPORT IVtkOCC_ShapePickerAlgo();

  //! Destructor
  Standard_EXPORT virtual ~IVtkOCC_ShapePickerAlgo();

  //! Sets the picker's view interface.
  //! The picker uses the view to obtain parameters of
  //! the 3D view projection.
  Standard_EXPORT virtual void SetView (const IVtk_IView::Handle& theView) Standard_OVERRIDE;

  //! Get number of picked entities.
  Standard_EXPORT virtual int  NbPicked() Standard_OVERRIDE;

  //! Get activated selection modes for a shape.
  //! @param [in] theShape a shape with activated selection mode(s)
  //! @return list of active selection modes
  Standard_EXPORT virtual IVtk_SelectionModeList 
    GetSelectionModes (const IVtk_IShape::Handle& theShape) const Standard_OVERRIDE;

public: //! @name Set selectable shapes and selection modes

  //! Activates/deactivates the given selection mode for the shape.
  //! If mode == SM_None, the shape becomes non-selectable and 
  //! is removed from the internal selection data.
  //! @param [in] theShape Shape for which the selection mode should be activated
  //! @param [in] theMode Selection mode to be activated
  //! @param [in] theIsTurnOn Flag to turn on/off the selection mode
  Standard_EXPORT virtual void SetSelectionMode (const IVtk_IShape::Handle& theShape,
                                                 const IVtk_SelectionMode theMode,
                                                 const bool theIsTurnOn = true) Standard_OVERRIDE;

  //! Activates/deactivates the given selection mode for the shape.
  //! If mode == SM_None, the shape becomes non-selectable and 
  //! is removed from the internal selection data.
  //! @param [in] theShapes List of shapes for which the selection mode should be activated
  //! @param [in] theMode Selection mode to be activated
  //! @param [in] theIsTurnOn Flag to turn on/off the selection mode
  Standard_EXPORT virtual void SetSelectionMode (const IVtk_ShapePtrList& theShapes,
                                                 const IVtk_SelectionMode theMode,
                                                 const bool theIsTurnOn = true) Standard_OVERRIDE;

public: //! @name Picking methods

  Standard_EXPORT virtual bool Pick (const double theX, const double theY) Standard_OVERRIDE;

  Standard_EXPORT virtual bool Pick (const double theXMin,
                                     const double theYMin,
                                     const double theXMax,
                                     const double theYMax) Standard_OVERRIDE;

  Standard_EXPORT virtual bool Pick (double** thePolyLine, const int theNbPoints) Standard_OVERRIDE;

public: //! @name Obtain picking results

  //! @return the list of picked top-level shape IDs,
  //! in the order of increasing depth (the ID of the shape closest to the eye 
  //! is the first in the list)
  Standard_EXPORT virtual const IVtk_ShapeIdList& ShapesPicked() const Standard_OVERRIDE;

  //! @param [in] theId Top-level shape ID
  //! @param [out] theShapeList the list of picked sub-shape IDs for the given top-level shape ID,
  //! in the order of increasing depth (the ID of the sub-shape closest to the eye 
  //! is the first in the list)
  Standard_EXPORT virtual void 
    SubShapesPicked (const IVtk_IdType theId, IVtk_ShapeIdList& theShapeList) const Standard_OVERRIDE;

  //! Remove selectable object from the picker (from internal maps).
  //! @param [in] theShape the selectable shape
  Standard_EXPORT virtual void RemoveSelectableObject(const IVtk_IShape::Handle& theShape);

  //! Return topmost picked 3D point or (Inf, Inf, Inf) if undefined.
  const gp_Pnt& TopPickedPoint() const { return myTopPickedPoint; }

public:

  DEFINE_STANDARD_RTTIEXT(IVtkOCC_ShapePickerAlgo,IVtk_IShapePickerAlgo)

private:

  //! Internal method, resets picked data
  void clearPicked();

  //! Internal method, extracts picked shapes from ViewerSelector
  //! and prepares the results in the form of IDs:
  //! In case of top-level shape(s) selected, only myShapesPicked list is filled.
  //! Otherwise, mySubShapesPicked map is filled in addition, to provide the information
  //! about selected sub-shapes grouped by their top-level shapes.
  //! @return true if some shapes has been picked, and false otherwise
  //! @see IVtkOCC_ShapePickerAlgo::pick
  bool processPicked();

  IVtk_IView::Handle             myView;
  IVtk_ShapeIdList               myShapesPicked;
  IVtk_SubShapeMap               mySubShapesPicked;
  gp_Pnt                         myTopPickedPoint;
  Handle(IVtkOCC_ViewerSelector) myViewerSelector;
};

#endif // __IVTKOCC_SHAPEPICKERALGO_H__