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 // Created on: 2022-08-08
 // Created by: Kseniya NOSULKO
 // Copyright (c) 2022 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 _BRepExtrema_ProximityDistTool_HeaderFile
 #define _BRepExtrema_ProximityDistTool_HeaderFile
 
 #include <BRepExtrema_ElementFilter.hxx>
 #include <BRepExtrema_MapOfIntegerPackedMapOfInteger.hxx>
 #include <BRepExtrema_TriangleSet.hxx>
 #include <BVH_Distance.hxx>
 #include <BVH_Tools.hxx>
 #include <Poly_Triangulation.hxx>
 
 //! Tool class for computation the proximity distance from first 
 //! primitive set to second one that is the maximal from minimum 
 //! perpendicular distances. If no perpendicular distance is found, the 
 //! minimum distance will be returned.
 //! This tool is not intended to be used independently, and is integrated
 //! in other classes, implementing algorithms based on shape tessellation
 //! (BRepExtrema_ProximityValueTool).
 //! 
 //! Please note that algorithm results are approximate and depend greatly
 //! on the quality of input tessellation(s).
 class BRepExtrema_ProximityDistTool : public BVH_Distance <Standard_Real, 3, BVH_Vec3d, 
                                                            BRepExtrema_TriangleSet>
 {
 public:
 
   typedef typename BVH_Tools<Standard_Real, 3>::BVH_PrjStateInTriangle BVH_PrjState;
 
   enum ProxPnt_Status
   {
     ProxPnt_Status_BORDER,
     ProxPnt_Status_MIDDLE,
     ProxPnt_Status_UNKNOWN
   };
 
 public:
 
   //! Struct with information about projection point state from 2nd BVH,
   //! providing proximity point of 2nd shape
   struct PrjState
   {
     PrjState()
     : myTrgIdx (0),
       myPrjState (BVH_PrjState::BVH_PrjStateInTriangle_INNER),
       myNumberOfFirstNode (0),
       myNumberOfLastNode (0)
     {}
 
     PrjState (const Standard_Integer theTrgIdx,
               const BVH_PrjState     thePrjState,
               const Standard_Integer theNumberOfFirstNode,
               const Standard_Integer theNumberOfLastNode)
     : myTrgIdx (theTrgIdx),
       myPrjState (thePrjState),
       myNumberOfFirstNode (theNumberOfFirstNode),
       myNumberOfLastNode (theNumberOfLastNode)
     {}
 
     Standard_Integer GetTrgIdx() const { return myTrgIdx; }
 
     BVH_PrjState GetPrjState() const { return myPrjState; }
 
     Standard_Integer GetNumberOfFirstNode() const { return myNumberOfFirstNode; }
 
     Standard_Integer GetNumberOfLastNode() const { return myNumberOfLastNode; }
 
   private:
 
     Standard_Integer myTrgIdx; //!< Index of triangle on which the projection is located
     BVH_PrjState myPrjState; //!< Position of a projection on the triangle (vertex, edge, inner)
     Standard_Integer myNumberOfFirstNode; //!< The 1st vtx of the triangle edge on which the projection is located
     Standard_Integer myNumberOfLastNode; //!< The 2nd vtx of the triangle edge on which the projection is located
   };
 
 public:
 
   //! Creates new unitialized tool.
   Standard_EXPORT BRepExtrema_ProximityDistTool();
 
   //! Creates new tool for the given element sets.
   Standard_EXPORT BRepExtrema_ProximityDistTool (const Handle(BRepExtrema_TriangleSet)& theSet1,
                                                  const Standard_Integer theNbSamples1,
                                                  const BVH_Array3d& theAddVertices1,
                                                  const NCollection_Vector<ProxPnt_Status>& theAddStatus1,
                                                  const Handle(BRepExtrema_TriangleSet)& theSet2,
                                                  const BRepExtrema_ShapeList& theShapeList1,
                                                  const BRepExtrema_ShapeList& theShapeList2);
 
 public:
 
   //! Loads the given element sets into the tool.
   Standard_EXPORT void LoadTriangleSets (const Handle(BRepExtrema_TriangleSet)& theSet1,
                                          const Handle(BRepExtrema_TriangleSet)& theSet2);
 
   //! Loads the given list of subshapes into the tool.
   Standard_EXPORT void LoadShapeLists (const BRepExtrema_ShapeList& theShapeList1,
                                        const BRepExtrema_ShapeList& theShapeList2);
 
   //! Loads given additional vertices and their statuses.
   void LoadAdditionalPointsFirstSet (const BVH_Array3d& theAddVertices1,
                                      const NCollection_Vector<ProxPnt_Status>& theAddStatus1);
 
   //! Performs searching of the proximity distance.
   Standard_EXPORT void Perform();
 
 public: //! @name Reject/Accept implementations
 
   //! Defines the rules for node rejection by bounding box.
   Standard_EXPORT virtual Standard_Boolean RejectNode (const BVH_Vec3d& theCornerMin,
                                                        const BVH_Vec3d& theCornerMax,
                                                        Standard_Real& theMetric) const Standard_OVERRIDE;
 
   //! Defines the rules for leaf acceptance.
   Standard_EXPORT virtual Standard_Boolean Accept (const Standard_Integer theSgmIdx,
                                                    const Standard_Real&) Standard_OVERRIDE;
 
 public:
 
   //! Returns true if the node is on the boarder.
   Standard_EXPORT static Standard_Boolean IsNodeOnBorder (const Standard_Integer theNodeIdx,
                                                           const Handle (Poly_Triangulation)& theTr);
 
   //! Returns true if the edge is on the boarder.
   Standard_EXPORT static Standard_Boolean IsEdgeOnBorder (const Standard_Integer theTrgIdx,
                                                           const Standard_Integer theFirstEdgeNodeIdx,
                                                           const Standard_Integer theSecondEdgeNodeIdx,
                                                           const Handle (Poly_Triangulation)& theTr);
 
 public:
 
   //! Returns points on triangles sets, which provide the proximity distance.
   void ProximityPoints (BVH_Vec3d& thePoint1, BVH_Vec3d& thePoint2) const
   {
     thePoint1 = myPnt1;
     thePoint2 = myPnt2;
   }
 
   //! Returns status of points on triangles sets, which provide the proximity distance.
   void ProximityPointsStatus (ProxPnt_Status& thePointStatus1, ProxPnt_Status& thePointStatus2) const
   {
     thePointStatus1 = myPntStatus1;
     thePointStatus2 = myPntStatus2;
   }
 
   //! Returns the computed distance
   Standard_Real ProximityDistance() const { return myProxDist; }
 
 protected:
 
   //! Computes the distance between object and BVH tree.
   Standard_EXPORT Standard_Real ComputeDistance();
 
   //! Defines the status of proximity points.
   Standard_EXPORT void DefineStatusProxPnt();
 
 private:
 
   //! Goes throught vertices from the 1st set.
   void goThroughtSet1 (const BVH_Array3d& aVertices1,
                        const Standard_Boolean theIsAdditionalSet);
 
   //! Defines the status of proximity point from 1st BVH.
   void defineStatusProxPnt1();
 
   //! Defines the status of proximity point from 2nd BVH.
   void defineStatusProxPnt2();
 
 protected:
 
   Standard_Real myMinDistance; //!< Minimal distance from point to BVH, could be not equal to myDistance
   BVH_Vec3d myMinDistPoint; //!< Point on BVH providing the minimal distance
 
   BVH_Vec3d myExtremaPoint; //!< Point on BVH providing the extrema
 
   Standard_Real myProxDist; //!< Proximity distance
 
   //! Proximity points
   BVH_Vec3d myPnt1, myPnt2;
 
   //! Proximity points' status
   ProxPnt_Status myPntStatus1, myPntStatus2;
 
 private:
 
   //! Set of all mesh elements (triangles) of the 1st shape.
   Handle(BRepExtrema_TriangleSet) mySet1;
   //! Set of all mesh elements (triangles) of the 2nd shape.
   Handle(BRepExtrema_TriangleSet) mySet2;
 
   //! List of subshapes of the 1st shape.
   BRepExtrema_ShapeList myShapeList1;
   //! List of subshapes of the 2nd shape.
   BRepExtrema_ShapeList myShapeList2;
 
   Standard_Integer myNbSamples1; //!< Number of samples points on the first shape
 
   //! Is vertex corresponding to proximity point of 1st shape from additional set
   Standard_Integer myIsProxVtx1FromAddSet;
   BVH_Array3d myAddVertices1; //!< Additional vertices on the 1st shape
   NCollection_Vector<ProxPnt_Status> myAddStatus1; //!< Status of additional vertices on the 1st shape
 
   //! Vertex index from 1st BVH corresponding to proximity point of 1st shape
   Standard_Integer myProxVtxIdx1;
 
   //! Information of projection point state from 2nd BVH providing proximity point of 2nd shape
   PrjState myProxPrjState;
 
   //! Information of projection point state from 2nd BVH providing the extrema
   PrjState myExtPrjState;
 
   //! Information of projection point state from 2nd BVH providing the minimal distance
   PrjState myMinPrjState;
 
 };
 
 #endif // _BRepExtrema_ProximityDistTool_HeaderFile

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