// Created on: 2007-09-10
// Created by: Igor FEOKTISTOV
// Copyright (c) 2007-2014 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 _BRepLib_FuseEdges_HeaderFile
#define _BRepLib_FuseEdges_HeaderFile

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

#include <TopoDS_Shape.hxx>
#include <TopTools_IndexedDataMapOfShapeListOfShape.hxx>
#include <TopTools_DataMapOfIntegerListOfShape.hxx>
#include <TopTools_DataMapOfIntegerShape.hxx>
#include <TopTools_DataMapOfShapeShape.hxx>
#include <Standard_Integer.hxx>
#include <TopTools_IndexedMapOfShape.hxx>
#include <TopTools_MapOfShape.hxx>
#include <TopTools_ListOfShape.hxx>
class TopoDS_Vertex;
class TopoDS_Edge;

//! This class can detect  vertices in a face that can
//! be considered useless and then perform the fuse of
//! the  edges and remove  the  useless vertices.  By
//! useles vertices,  we mean :
//! * vertices that  have  exactly two connex edges
//! * the edges connex to the vertex must have
//! exactly the same 2 connex faces .
//! * The edges connex to the vertex must have the
//! same geometric support.
class BRepLib_FuseEdges
{
public:
  DEFINE_STANDARD_ALLOC

  //! Initialise members  and build  construction of map
  //! of ancestors.
  Standard_EXPORT BRepLib_FuseEdges(const TopoDS_Shape&    theShape,
                                    const Standard_Boolean PerformNow = Standard_False);

  //! set edges to avoid being fused
  Standard_EXPORT void AvoidEdges(const TopTools_IndexedMapOfShape& theMapEdg);

  //! set mode to enable concatenation G1 BSpline edges in one
  //! End  Modified  by  IFV  19.04.07
  Standard_EXPORT void SetConcatBSpl(const Standard_Boolean theConcatBSpl = Standard_True);

  //! returns  all the list of edges to be fused
  //! each list of the map represent a set of connex edges
  //! that can be fused.
  Standard_EXPORT void Edges(TopTools_DataMapOfIntegerListOfShape& theMapLstEdg);

  //! returns all the fused edges. each integer entry in
  //! the   map  corresponds  to  the  integer   in the
  //! DataMapOfIntegerListOfShape  we    get in  method
  //! Edges.   That is to say, to  the list  of edges in
  //! theMapLstEdg(i) corresponds the resulting edge theMapEdge(i)
  Standard_EXPORT void ResultEdges(TopTools_DataMapOfIntegerShape& theMapEdg);

  //! returns the map of modified faces.
  Standard_EXPORT void Faces(TopTools_DataMapOfShapeShape& theMapFac);

  //! returns myShape modified with the list of internal
  //! edges removed from it.
  Standard_EXPORT TopoDS_Shape& Shape();

  //! returns the number of vertices candidate to be removed
  Standard_EXPORT Standard_Integer NbVertices();

  //! Using  map of list of connex  edges, fuse each list to
  //! one edge and then update myShape
  Standard_EXPORT void Perform();

protected:
private:
  //! Build the all the lists of edges that are to be fused
  Standard_EXPORT void BuildListEdges();

  //! Build result   fused edges according  to  the list
  //! builtin BuildLisEdges
  Standard_EXPORT void BuildListResultEdges();

  Standard_EXPORT void BuildListConnexEdge(const TopoDS_Shape&   theEdge,
                                           TopTools_MapOfShape&  theMapUniq,
                                           TopTools_ListOfShape& theLstEdg);

  Standard_EXPORT Standard_Boolean NextConnexEdge(const TopoDS_Vertex& theVertex,
                                                  const TopoDS_Shape&  theEdge,
                                                  TopoDS_Shape&        theEdgeConnex) const;

  Standard_EXPORT Standard_Boolean SameSupport(const TopoDS_Edge& E1, const TopoDS_Edge& E2) const;

  Standard_EXPORT Standard_Boolean UpdatePCurve(const TopoDS_Edge&          theOldEdge,
                                                TopoDS_Edge&                theNewEdge,
                                                const TopTools_ListOfShape& theLstEdg) const;

  TopoDS_Shape                              myShape;
  Standard_Boolean                          myShapeDone;
  Standard_Boolean                          myEdgesDone;
  Standard_Boolean                          myResultEdgesDone;
  TopTools_IndexedDataMapOfShapeListOfShape myMapVerLstEdg;
  TopTools_IndexedDataMapOfShapeListOfShape myMapEdgLstFac;
  TopTools_DataMapOfIntegerListOfShape      myMapLstEdg;
  TopTools_DataMapOfIntegerShape            myMapEdg;
  TopTools_DataMapOfShapeShape              myMapFaces;
  Standard_Integer                          myNbConnexEdge;
  TopTools_IndexedMapOfShape                myAvoidEdg;
  Standard_Boolean                          myConcatBSpl;
};

#endif // _BRepLib_FuseEdges_HeaderFile
