// Created on: 1996-02-13
// Created by: Yves FRICAUD
// Copyright (c) 1996-1999 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.

#include <BRepOffset_MakeOffset.hxx>
#include <BRepOffsetAPI_MakeOffsetShape.hxx>
#include <Standard_ConstructionError.hxx>
#include <TopoDS_Shape.hxx>
#include <TopTools_ListIteratorOfListOfShape.hxx>

//=======================================================================
//function : BRepOffsetAPI_MakeOffsetShape
//purpose  : 
//=======================================================================
BRepOffsetAPI_MakeOffsetShape::BRepOffsetAPI_MakeOffsetShape()
: myLastUsedAlgo(OffsetAlgo_NONE)
{
}

//=======================================================================
//function : BRepOffsetAPI_MakeOffsetShape
//purpose  : 
//=======================================================================
BRepOffsetAPI_MakeOffsetShape::BRepOffsetAPI_MakeOffsetShape(const TopoDS_Shape& S,
                                                             const Standard_Real Offset,
                                                             const Standard_Real Tol,
                                                             const BRepOffset_Mode Mode,
                                                             const Standard_Boolean Intersection,
                                                             const Standard_Boolean SelfInter,
                                                             const GeomAbs_JoinType Join,
                                                             const Standard_Boolean RemoveIntEdges)
: myLastUsedAlgo(OffsetAlgo_NONE)
{
  PerformByJoin(S, Offset, Tol, Mode, Intersection, SelfInter, Join, RemoveIntEdges);
}

//=======================================================================
//function : PerformByJoin
//purpose  : 
//=======================================================================
void BRepOffsetAPI_MakeOffsetShape::PerformByJoin
(const TopoDS_Shape&    S,
 const Standard_Real    Offset,
 const Standard_Real    Tol,
 const BRepOffset_Mode  Mode,
 const Standard_Boolean Intersection,
 const Standard_Boolean SelfInter,
 const GeomAbs_JoinType Join,
 const Standard_Boolean RemoveIntEdges)
{
  NotDone();
  myLastUsedAlgo = OffsetAlgo_JOIN;

  myOffsetShape.Initialize (S,Offset,Tol,Mode,Intersection,SelfInter,
                            Join, Standard_False, RemoveIntEdges);
  myOffsetShape.MakeOffsetShape();

  if (!myOffsetShape.IsDone())
    return;

  myShape  = myOffsetShape.Shape();
  Done();
}

//=======================================================================
//function : PerformBySimple
//purpose  : 
//=======================================================================
void BRepOffsetAPI_MakeOffsetShape::PerformBySimple(const TopoDS_Shape& theS,
                                                    const Standard_Real theOffsetValue)
{
  NotDone();
  myLastUsedAlgo = OffsetAlgo_SIMPLE;

  mySimpleOffsetShape.Initialize(theS, theOffsetValue);
  mySimpleOffsetShape.Perform();

  if (!mySimpleOffsetShape.IsDone())
    return;

  myShape = mySimpleOffsetShape.GetResultShape();
  Done();
}

//=======================================================================
//function :MakeOffset
//purpose  : 
//=======================================================================
const BRepOffset_MakeOffset& BRepOffsetAPI_MakeOffsetShape::MakeOffset() const
{
  return myOffsetShape;
}

//=======================================================================
//function : Build
//purpose  : 
//=======================================================================
void BRepOffsetAPI_MakeOffsetShape::Build()
{
}

//=======================================================================
//function : Generated
//purpose  : 
//=======================================================================
const TopTools_ListOfShape& BRepOffsetAPI_MakeOffsetShape::Generated (const TopoDS_Shape& S)
{
  myGenerated.Clear();

  if (myLastUsedAlgo == OffsetAlgo_JOIN && !myOffsetShape.ClosingFaces().Contains(S))
  {
    myOffsetShape.OffsetFacesFromShapes ().LastImage (S, myGenerated);

    if (!myOffsetShape.ClosingFaces().IsEmpty())
    {
      // Reverse generated shapes in case of small solids.
      // Useful only for faces without influence on others.
      TopTools_ListIteratorOfListOfShape it(myGenerated);
      for (; it.More(); it.Next())
        it.Value().Reverse();
    }
  }
  else if (myLastUsedAlgo == OffsetAlgo_SIMPLE)
  {
    TopoDS_Shape aGenShape = mySimpleOffsetShape.Generated(S);
    if (!aGenShape.IsNull())
      myGenerated.Append(aGenShape);
  }

  return myGenerated;
}

//=======================================================================
//function : GeneratedEdge
//purpose  : 
//=======================================================================
const TopTools_ListOfShape& BRepOffsetAPI_MakeOffsetShape::GeneratedEdge (const TopoDS_Shape& S)
{
  myGenerated.Clear();

  if (myLastUsedAlgo == OffsetAlgo_JOIN)
  {
    myOffsetShape.OffsetEdgesFromShapes().LastImage (S, myGenerated);

    if (!myGenerated.IsEmpty())
    {
      if (S.IsSame(myGenerated.First()))
        myGenerated.RemoveFirst();
    }
  }
  else if (myLastUsedAlgo == OffsetAlgo_SIMPLE)
  {
    TopoDS_Shape aGenShape = mySimpleOffsetShape.Generated(S);
    if (!aGenShape.IsNull())
      myGenerated.Append(aGenShape);
  }

  return myGenerated;
}

//=======================================================================
//function : GetJoinType
//purpose  : Query offset join type.
//=======================================================================
GeomAbs_JoinType BRepOffsetAPI_MakeOffsetShape::GetJoinType() const
{
  return myOffsetShape.GetJoinType();
}