// Created on: 1992-05-27
// Created by: Remi LEQUETTE
// Copyright (c) 1992-1999 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 _BRep_TFace_HeaderFile
#define _BRep_TFace_HeaderFile

#include <Standard.hxx>

#include <Poly_ListOfTriangulation.hxx>
#include <TopLoc_Location.hxx>
#include <Standard_Real.hxx>
#include <TopoDS_TFace.hxx>
class Geom_Surface;
class TopoDS_TShape;

class BRep_TFace;
DEFINE_STANDARD_HANDLE(BRep_TFace, TopoDS_TFace)

//! The Tface from BRep  is  based  on the TFace  from
//! TopoDS. The TFace contains :
//!
//! * A surface, a tolerance and a Location.
//!
//! * A NaturalRestriction flag,   when this  flag  is
//! True the  boundary of the  face is known to be the
//! parametric space (Umin, UMax, VMin, VMax).
//!
//! * An optional list of triangulations. If there are any
//! triangulations the surface can be absent.
//!
//! The  Location is  used   for the Surface.
//!
//! The triangulation  is in the same reference system
//! than the TFace.     A point on mySurface must   be
//! transformed with myLocation,  but  not a point  on
//! the triangulation.
//!
//! The Surface may  be shared by different TFaces but
//! not the  Triangulation, because the  Triangulation
//! may be modified by  the edges.
class BRep_TFace : public TopoDS_TFace
{

public:

  //! Creates an empty TFace.
  Standard_EXPORT BRep_TFace();

  //! Returns face surface.
  const Handle(Geom_Surface)& Surface() const { return mySurface; }

  //! Sets surface for this face.
  void Surface (const Handle(Geom_Surface)& theSurface) { mySurface = theSurface;}

  //! Returns the face location.
  const TopLoc_Location& Location() const { return myLocation; }

  //! Sets the location for this face.
  void Location (const TopLoc_Location& theLocation) { myLocation = theLocation; }

  //! Returns the face tolerance.
  Standard_Real Tolerance() const { return myTolerance; }

  //! Sets the tolerance for this face.
  void Tolerance (const Standard_Real theTolerance) { myTolerance = theTolerance; }

  //! Returns TRUE if the boundary of this face is known to be the parametric space (Umin, UMax, VMin, VMax).
  Standard_Boolean NaturalRestriction() const { return myNaturalRestriction; }

  //! Sets the flag that is TRUE if the boundary of this face is known to be the parametric space.
  void NaturalRestriction (const Standard_Boolean theRestriction) { myNaturalRestriction = theRestriction; }

  //! Returns the triangulation of this face according to the mesh purpose.
  //! @param[in] thePurpose a mesh purpose to find appropriate triangulation (NONE by default).
  //! @return an active triangulation in case of NONE purpose,
  //!         the first triangulation appropriate for the input purpose,
  //!         just the first triangulation if none matching other criteria and input purpose is AnyFallback
  //!         or null handle if there is no any suitable triangulation.
  Standard_EXPORT const Handle(Poly_Triangulation)& Triangulation (const Poly_MeshPurpose thePurpose = Poly_MeshPurpose_NONE) const;

  //! Sets input triangulation for this face.
  //! @param theTriangulation [in] triangulation to be set
  //! @param theToReset [in] flag to reset triangulations list to new list with only one input triangulation.
  //! If theTriangulation is NULL internal list of triangulations will be cleared and active triangulation will be nullified.
  //! If theToReset is TRUE internal list of triangulations will be reset
  //! to new list with only one input triangulation that will be active.
  //! Else if input triangulation is contained in internal triangulations list it will be made active,
  //!      else the active triangulation will be replaced to input one.
  Standard_EXPORT void Triangulation (const Handle(Poly_Triangulation)& theTriangulation, const Standard_Boolean theToReset = true);

  //! Returns a copy  of the  TShape  with no sub-shapes.
  //! The new Face has no triangulation.
  Standard_EXPORT virtual Handle(TopoDS_TShape) EmptyCopy() const Standard_OVERRIDE;

  //! Dumps the content of me into the stream
  Standard_EXPORT virtual void DumpJson (Standard_OStream& theOStream, Standard_Integer theDepth = -1) const Standard_OVERRIDE;

public:

  //! Returns the list of available face triangulations.
  const Poly_ListOfTriangulation& Triangulations() const { return myTriangulations; }

  //! Sets input list of triangulations and currently active triangulation for this face.
  //! If list is empty internal list of triangulations will be cleared and active triangulation will be nullified.
  //! Else this list will be saved and the input active triangulation be saved as active.
  //! Use NULL active triangulation to set the first triangulation in list as active.
  //! Note: the method throws exception if there is any NULL triangulation in input list or
  //!       if this list doesn't contain input active triangulation.
  Standard_EXPORT void Triangulations (const Poly_ListOfTriangulation& theTriangulations, const Handle(Poly_Triangulation)& theActiveTriangulation);

  //! Returns number of available face triangulations.
  Standard_Integer NbTriangulations() const { return myTriangulations.Size(); }

  //! Returns current active triangulation.
  const Handle(Poly_Triangulation)& ActiveTriangulation() const { return myActiveTriangulation; }

  DEFINE_STANDARD_RTTIEXT(BRep_TFace,TopoDS_TFace)

private:

  Poly_ListOfTriangulation myTriangulations;
  Handle(Poly_Triangulation) myActiveTriangulation;
  Handle(Geom_Surface) mySurface;
  TopLoc_Location myLocation;
  Standard_Real myTolerance;
  Standard_Boolean myNaturalRestriction;
};

#endif // _BRep_TFace_HeaderFile