// Created on: 1993-01-21
// Created by: Remi LEQUETTE
// Copyright (c) 1993-1999 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 _BRepTools_WireExplorer_HeaderFile
#define _BRepTools_WireExplorer_HeaderFile

#include "Standard.hxx"
#include "Standard_DefineAlloc.hxx"

#include "TopoDS_Shape.hxx"
#include "NCollection_List.hxx"
#include "TopTools_ShapeMapHasher.hxx"
#include "NCollection_DataMap.hxx"
#include "TopoDS_Edge.hxx"
#include "TopoDS_Vertex.hxx"
#include "TopoDS_Face.hxx"
#include "NCollection_Map.hxx"
#include "TopAbs_Orientation.hxx"
class TopoDS_Wire;

//! The WireExplorer is a tool to explore the edges of
//! a wire in a connection order.
//!
//! i.e. each edge is connected to the previous one by
//! its origin.
//! If a wire is not closed returns only a segment of edges which
//! length depends on started in exploration edge.
//! Algorithm suggests that wire is valid and has no any defects, which
//! can stop edge exploration. Such defects can be loops, wrong orientation of edges
//! (two edges go in to shared vertex or go out from shared vertex), branching of edges,
//! the presens of edges with INTERNAL or EXTERNAL orientation. If wire has
//! such kind of defects WireExplorer can return not all
//! edges in a wire. it depends on type of defect and position of starting edge.
class BRepTools_WireExplorer
{
public:
  DEFINE_STANDARD_ALLOC

  //! Constructs an empty explorer (which can be initialized using Init)
  Standard_EXPORT BRepTools_WireExplorer();

  //! IInitializes an exploration of the wire <W>.
  Standard_EXPORT BRepTools_WireExplorer(const TopoDS_Wire& W);

  //! Initializes an exploration of the wire <W>.
  //! F is used to select the edge connected to the
  //! previous in the parametric representation of <F>.
  Standard_EXPORT BRepTools_WireExplorer(const TopoDS_Wire& W, const TopoDS_Face& F);

  //! Initializes an exploration of the wire <W>.
  Standard_EXPORT void Init(const TopoDS_Wire& W);

  //! Initializes an exploration of the wire <W>.
  //! F is used to select the edge connected to the
  //! previous in the parametric representation of <F>.
  Standard_EXPORT void Init(const TopoDS_Wire& W, const TopoDS_Face& F);

  //! Initializes an exploration of the wire <W>.
  //! F is used to select the edge connected to the
  //! previous in the parametric representation of <F>.
  //! <UMIn>, <UMax>, <VMin>, <VMax> - the UV bounds of the face <F>.
  Standard_EXPORT void Init(const TopoDS_Wire& W,
                            const TopoDS_Face& F,
                            const double       UMin,
                            const double       UMax,
                            const double       VMin,
                            const double       VMax);

  //! Returns True if there is a current edge.
  Standard_EXPORT bool More() const;

  //! Proceeds to the next edge.
  Standard_EXPORT void Next();

  //! Returns the current edge.
  Standard_EXPORT const TopoDS_Edge& Current() const;

  //! Returns an Orientation for the current edge.
  Standard_EXPORT TopAbs_Orientation Orientation() const;

  //! Returns the vertex connecting the current edge to
  //! the previous one.
  Standard_EXPORT const TopoDS_Vertex& CurrentVertex() const;

  //! Clears the content of the explorer.
  Standard_EXPORT void Clear();

private:
  NCollection_DataMap<TopoDS_Shape, NCollection_List<TopoDS_Shape>, TopTools_ShapeMapHasher> myMap;
  TopoDS_Edge                                                                                myEdge;
  TopoDS_Vertex                                          myVertex;
  TopoDS_Face                                            myFace;
  NCollection_Map<TopoDS_Shape, TopTools_ShapeMapHasher> myDoubles;
  bool                                                   myReverse;
  double                                                 myTolU;
  double                                                 myTolV;
};

#endif // _BRepTools_WireExplorer_HeaderFile