// Created on: 1994-10-13
// Created by: Jean Yves LEBEY
// Copyright (c) 1994-1999 Matra Datavision
// Copyright (c) 1999-2014 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 _TopOpeBRep_FaceEdgeIntersector_HeaderFile
#define _TopOpeBRep_FaceEdgeIntersector_HeaderFile

#include <Standard.hxx>
#include <Standard_DefineAlloc.hxx>

#include <TopoDS_Face.hxx>
#include <TopoDS_Edge.hxx>
#include <GeomAdaptor_Curve.hxx>
#include <IntCurveSurface_IntersectionPoint.hxx>
#include <NCollection_Sequence.hxx>
#include <Standard_Integer.hxx>
#include <TopExp_Explorer.hxx>
#include <TopoDS_Shape.hxx>
#include <TopoDS_Vertex.hxx>
#include <TopAbs_State.hxx>
#include <TopAbs_Orientation.hxx>
#include <TopAbs_ShapeEnum.hxx>
class gp_Pnt;
class gp_Pnt2d;
class TopOpeBRepDS_Transition;

//! Describes the intersection of a face and an edge.
class TopOpeBRep_FaceEdgeIntersector
{
public:
  DEFINE_STANDARD_ALLOC

  Standard_EXPORT TopOpeBRep_FaceEdgeIntersector();

  Standard_EXPORT void Perform(const TopoDS_Shape& F, const TopoDS_Shape& E);

  Standard_EXPORT bool IsEmpty();

  //! returns intersected face or edge according to
  //! value of <Index> = 1 or 2
  Standard_EXPORT const TopoDS_Shape& Shape(const int Index) const;

  //! Force the tolerance values used by the next Perform(S1,S2) call.
  Standard_EXPORT void ForceTolerance(const double tol);

  //! Return the tolerance value used in the last Perform() call
  //! If ForceTolerance() has been called, return the given value.
  //! If not, return value extracted from shapes.
  Standard_EXPORT double Tolerance() const;

  Standard_EXPORT int NbPoints() const;

  Standard_EXPORT void InitPoint();

  Standard_EXPORT bool MorePoint() const;

  Standard_EXPORT void NextPoint();

  //! return the 3D point of the current intersection point.
  Standard_EXPORT gp_Pnt Value() const;

  //! parametre de Value() sur l'arete
  Standard_EXPORT double Parameter() const;

  //! parametre de Value() sur la face
  Standard_EXPORT void UVPoint(gp_Pnt2d& P) const;

  //! IN ou ON / a la face. Les points OUT ne sont pas retournes.
  Standard_EXPORT TopAbs_State State() const;

  //! Index = 1 transition par rapport a la face, en cheminant sur l'arete
  Standard_EXPORT TopOpeBRepDS_Transition
    Transition(const int Index, const TopAbs_Orientation FaceOrientation) const;

  Standard_EXPORT bool IsVertex(const TopoDS_Shape& S,
                                const gp_Pnt&       P,
                                const double        Tol,
                                TopoDS_Vertex&      V);

  Standard_EXPORT bool IsVertex(const int I, TopoDS_Vertex& V);

  //! trace only
  Standard_EXPORT int Index() const;

private:
  Standard_EXPORT void ResetIntersection();

  //! extract tolerance values from shapes <S1>,<S2>,
  //! in order to perform intersection between <S1> and <S2>
  //! with tolerance values "fitting" the shape tolerances.
  //! (called by Perform() by default, when ForceTolerances() has not
  //! been called)
  Standard_EXPORT void ShapeTolerances(const TopoDS_Shape& S1, const TopoDS_Shape& S2);

  //! returns the max tolerance of sub-shapes of type <T>
  //! found in shape <S>. If no such sub-shape found, return
  //! Precision::Intersection()
  //! (called by ShapeTolerances())
  Standard_EXPORT double ToleranceMax(const TopoDS_Shape& S, const TopAbs_ShapeEnum T) const;

  TopoDS_Face                                             myFace;
  TopoDS_Edge                                             myEdge;
  double                                                  myTol;
  bool                                                    myForceTolerance;
  GeomAdaptor_Curve                                       myCurve;
  bool                                                    myIntersectionDone;
  NCollection_Sequence<IntCurveSurface_IntersectionPoint> mySequenceOfPnt;
  NCollection_Sequence<int>                               mySequenceOfState;
  int                                                     myPointIndex;
  int                                                     myNbPoints;
  TopExp_Explorer                                         myVertexExplorer;
  TopoDS_Shape                                            myNullShape;
  TopoDS_Vertex                                           myNullVertex;
};

#endif // _TopOpeBRep_FaceEdgeIntersector_HeaderFile
