// Created on: 2008-04-11
// Created by: Peter KURNEV
// Copyright (c) 2008-2014 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 <Bnd_Box.hxx>
#include <BRep_Tool.hxx>
#include <BRepGProp.hxx>
#include <BRepMesh_DiscretFactory.hxx>
#include <BRepMesh_DiscretRoot.hxx>
#include <BRepMesh_Edge.hxx>
#include <BRepMesh_FactoryError.hxx>
#include <BRepMesh_IncrementalMesh.hxx>
#include <DBRep.hxx>
#include <Draw.hxx>
#include <Draw_Interpretor.hxx>
#include <DrawTrSurf.hxx>
#include <gp_Vec.hxx>
#include <GProp_GProps.hxx>
#include <MeshTest.hxx>
#include <MeshTest_CheckTopology.hxx>
#include <NCollection_Map.hxx>
#include <Poly_Polygon2D.hxx>
#include <Poly_Polygon3D.hxx>
#include <Poly_PolygonOnTriangulation.hxx>
#include <Poly_Triangulation.hxx>
#include <Standard.hxx>
#include <TColgp_Array1OfPnt2d.hxx>
#include <TCollection_AsciiString.hxx>
#include <TColStd_Array1OfInteger.hxx>
#include <TColStd_MapIteratorOfMapOfAsciiString.hxx>
#include <TColStd_MapOfAsciiString.hxx>
#include <TopExp.hxx>
#include <TopExp_Explorer.hxx>
#include <TopoDS.hxx>
#include <TopoDS_Face.hxx>
#include <TopTools_IndexedMapOfShape.hxx>
#include <Geom_BSplineCurve.hxx>
#include <Geom2d_BSplineCurve.hxx>

static Standard_Integer mpnames           (Draw_Interpretor& , Standard_Integer , const char** );
static Standard_Integer mpsetdefaultname  (Draw_Interpretor& , Standard_Integer , const char** );
static Standard_Integer mpgetdefaultname  (Draw_Interpretor& , Standard_Integer , const char** );
static Standard_Integer mpsetfunctionname (Draw_Interpretor& , Standard_Integer , const char** );
static Standard_Integer mpgetfunctionname (Draw_Interpretor& , Standard_Integer , const char** );
static Standard_Integer mperror           (Draw_Interpretor& , Standard_Integer , const char** );
static Standard_Integer mpincmesh         (Draw_Interpretor& , Standard_Integer , const char** );
static Standard_Integer mpparallel        (Draw_Interpretor& , Standard_Integer , const char** );
static Standard_Integer triarea           (Draw_Interpretor& , Standard_Integer , const char** );
static Standard_Integer tricheck          (Draw_Interpretor& , Standard_Integer , const char** );

//=======================================================================
//function : PluginCommands
//purpose  : 
//=======================================================================
void MeshTest::PluginCommands(Draw_Interpretor& theCommands)
{
  static Standard_Boolean done = Standard_False;
  if (done) {
    return;
  }
  done = Standard_True;
  //
  const char* g = "Mesh Commands";
  // Commands
  theCommands.Add("mpnames"          , "use mpnames"          , __FILE__, mpnames    , g);
  theCommands.Add("mpsetdefaultname" , "use mpsetdefaultname" , __FILE__, mpsetdefaultname     , g);
  theCommands.Add("mpgetdefaultname" , "use mpgetdefaultname" , __FILE__, mpgetdefaultname     , g);
  theCommands.Add("mpsetfunctionname", "use mpsetfunctionname", __FILE__, mpsetfunctionname     , g);
  theCommands.Add("mpgetfunctionname", "use mpgetfunctionname", __FILE__, mpgetfunctionname     , g);
  theCommands.Add("mperror"          , "use mperror"          , __FILE__, mperror     , g);
  theCommands.Add("mpincmesh"        , "use mpincmesh"        , __FILE__, mpincmesh      , g);
  theCommands.Add("mpparallel"       , "mpparallel [toTurnOn] : show / set multi-threading flag for incremental mesh",
    __FILE__, mpparallel, g);
  theCommands.Add("triarea","shape [eps]  (computes triangles and surface area)",__FILE__, triarea, g);
  theCommands.Add("tricheck", "shape [-small]  (checks triangulation of shape);\n"
                  "\"-small\"-option allows finding triangles with small area", __FILE__, tricheck, g);
}

//=======================================================================
//function : mpnames
//purpose  : 
//=======================================================================
static Standard_Integer mpnames (Draw_Interpretor& , Standard_Integer n, const char** )
{
  Standard_Integer aNb;
  TColStd_MapIteratorOfMapOfAsciiString aIt;
  //
  if (n!=1) {
    printf(" use mpnames\n");
    return 0;
  }
  //
  const TColStd_MapOfAsciiString& aMN=BRepMesh_DiscretFactory::Get().Names();
  aNb=aMN.Extent();
  if (!aNb) {
    printf(" *no names found\n");
    return 0;
  }
  //
  printf(" *available names:\n");
  aIt.Initialize(aMN);
  for (; aIt.More(); aIt.Next()) {
    const TCollection_AsciiString& aName=aIt.Key();
    printf("  %s\n", aName.ToCString());
  }
  //
  return 0;
}
//=======================================================================
//function : mpsetdefaultname
//purpose  : 
//=======================================================================
static Standard_Integer mpsetdefaultname (Draw_Interpretor& , Standard_Integer n, const char**a )
{
  TCollection_AsciiString aName;
  //
  if (n!=2) {
    printf(" use mpsetdefaultname name\n");
    return 0;
  }
  //
  aName=a[1];
  //
  if (BRepMesh_DiscretFactory::Get().SetDefaultName (aName))
    printf(" *ready\n");
  else
    printf(" *fault\n");
  //
  return 0;
}
//=======================================================================
//function : mpgetdefaultname
//purpose  : 
//=======================================================================
static Standard_Integer mpgetdefaultname (Draw_Interpretor& , Standard_Integer n, const char** )
{
  if (n!=1) {
    printf(" use mpgetdefaultname\n");
    return 0;
  }
  //
  const TCollection_AsciiString& aName=BRepMesh_DiscretFactory::Get().DefaultName();
  printf(" *default name: %s\n", aName.ToCString());
  //
  return 0;
}
//=======================================================================
//function : mpsetfunctionname
//purpose  : 
//=======================================================================
static Standard_Integer mpsetfunctionname (Draw_Interpretor& , Standard_Integer n, const char**a )
{
  TCollection_AsciiString aName;
  //
  if (n!=2) {
    printf(" use mpsetfunctionname name\n");
    return 0;
  }
  //
  aName=a[1];
  //
  if (BRepMesh_DiscretFactory::Get().SetFunctionName (aName))
    printf(" *ready\n");
  else
    printf(" *fault\n");
  //
  return 0;
}
//=======================================================================
//function : mpgetdefaultname
//purpose  : 
//=======================================================================
static Standard_Integer mpgetfunctionname (Draw_Interpretor& , Standard_Integer n, const char** )
{
  if (n!=1) {
    printf(" use mpgetfunctionname\n");
    return 0;
  }
  //
  const TCollection_AsciiString& aName=BRepMesh_DiscretFactory::Get().FunctionName();
  printf(" *function name: %s\n", aName.ToCString());
  //
  return 0;
}
//=======================================================================
//function : mperror
//purpose  : 
//=======================================================================
static Standard_Integer mperror (Draw_Interpretor& , Standard_Integer n, const char** )
{
  BRepMesh_FactoryError aErr;
  //
  if (n!=1) {
    printf(" use mperror\n");
    return 0;
  }
  //
  aErr=BRepMesh_DiscretFactory::Get().ErrorStatus();
  printf(" *ErrorStatus: %d\n", (int)aErr);
  //
  return 0;
}

//=======================================================================
//function :mpincmesh
//purpose  : 
//=======================================================================
static Standard_Integer mpincmesh (Draw_Interpretor& , Standard_Integer n, const char** a)
{
  Standard_Real aDeflection, aAngle;
  TopoDS_Shape aS;
  //
  if (n<3) {
    printf(" use mpincmesh s deflection [angle]\n");
    return 0;
  }
  //
  aS=DBRep::Get(a[1]);
  if (aS.IsNull()) {
    printf(" null shapes is not allowed here\n");
    return 0;
  }
  //
  aDeflection=Draw::Atof(a[2]);
  aAngle=0.5;
  if (n>3) {
    aAngle=Draw::Atof(a[3]);
  }
  //
  Handle(BRepMesh_DiscretRoot) aMeshAlgo = BRepMesh_DiscretFactory::Get().Discret (aS,
                                                                                   aDeflection,
                                                                                   aAngle);
  //
  BRepMesh_FactoryError aErr = BRepMesh_DiscretFactory::Get().ErrorStatus();
  if (aErr != BRepMesh_FE_NOERROR)
  {
    printf(" *Factory::Get().ErrorStatus()=%d\n", (int)aErr);
  }
  //
  if (aMeshAlgo.IsNull())
  {
    printf(" *Can not create the algo\n");
    return 0;
  }
  //
  aMeshAlgo->Perform();
  if (!aMeshAlgo->IsDone())
  {
    printf(" *Not done\n");
  }
  //
  return 0;
}

//#######################################################################
static Standard_Integer triarea (Draw_Interpretor& di, int n, const char ** a)
{

  if (n < 2) return 1;

  TopoDS_Shape shape = DBRep::Get(a[1]);
  if (shape.IsNull()) return 1;
  Standard_Real anEps = -1.;
  if (n > 2)
    anEps = Draw::Atof(a[2]);

  TopTools_IndexedMapOfShape aMapF;
  TopExp::MapShapes (shape, TopAbs_FACE, aMapF);

  // detect if a shape has triangulation
  Standard_Boolean hasPoly = Standard_False;
  int i;
  for (i=1; i <= aMapF.Extent(); i++) {
    const TopoDS_Face& aFace = TopoDS::Face(aMapF(i));
    TopLoc_Location aLoc;
    Handle(Poly_Triangulation) aPoly = BRep_Tool::Triangulation(aFace,aLoc);
    if (!aPoly.IsNull()) {
      hasPoly = Standard_True;
      break;
    }
  }

  // compute area by triangles
  double aTriArea=0;
  if (hasPoly) {
    for (i=1; i <= aMapF.Extent(); i++) {
      const TopoDS_Face& aFace = TopoDS::Face(aMapF(i));
      TopLoc_Location aLoc;
      Handle(Poly_Triangulation) aPoly = BRep_Tool::Triangulation(aFace,aLoc);
      if (aPoly.IsNull()) {
        std::cout << "face "<<i<<" has no triangulation"<<std::endl;
        continue;
      }
      const Poly_Array1OfTriangle& triangles = aPoly->Triangles();
      const TColgp_Array1OfPnt& nodes = aPoly->Nodes();
      for (int j=triangles.Lower(); j <= triangles.Upper(); j++) {
        const Poly_Triangle& tri = triangles(j);
        int n1, n2, n3;
        tri.Get (n1, n2, n3);
        const gp_Pnt& p1 = nodes(n1);
        const gp_Pnt& p2 = nodes(n2);
        const gp_Pnt& p3 = nodes(n3);
        gp_Vec v1(p1, p2);
        gp_Vec v2(p1, p3);
        double ar = v1.CrossMagnitude(v2);
        aTriArea += ar;
      }
    }
    aTriArea /= 2;
  }

  // compute area by geometry
  GProp_GProps props;
  if (anEps <= 0.)
    BRepGProp::SurfaceProperties(shape, props);
  else
    BRepGProp::SurfaceProperties(shape, props, anEps);
  double aGeomArea = props.Mass();

  di << aTriArea << " " << aGeomArea << "\n";
  return 0;
}

//#######################################################################
Standard_Boolean IsEqual(const BRepMesh_Edge& theFirst, const BRepMesh_Edge& theSecond) 
{
  return theFirst.IsEqual(theSecond);
}

static Standard_Integer tricheck (Draw_Interpretor& di, int n, const char ** a)
{
  if (n < 2) return 1;

  TopoDS_Shape shape = DBRep::Get(a[1]);
  if (shape.IsNull()) return 1;

  const Standard_Boolean isToFindSmallTriangles = (n >= 3) ? (strcmp(a[2], "-small") == 0) : Standard_False;

  TopTools_IndexedMapOfShape aMapF;
  TopExp::MapShapes (shape, TopAbs_FACE, aMapF);
  const Standard_CString name = ".";

  // execute check
  MeshTest_CheckTopology aCheck(shape);
  aCheck.Perform(di);

  // dump info on free links inside the triangulation
  Standard_Integer nbFree = 0;
  Standard_Integer nbFac = aCheck.NbFacesWithFL(), i, k;
  if (nbFac > 0) {
    for (k=1; k <= nbFac; k++) {
      Standard_Integer nbEdge = aCheck.NbFreeLinks(k);
      Standard_Integer iF = aCheck.GetFaceNumWithFL(k);
      nbFree += nbEdge;
      di << "free links of face " << iF << "\n";

      const TopoDS_Shape& aShape = aMapF.FindKey(iF);
      const TopoDS_Face& aFace = TopoDS::Face(aShape);
      TopLoc_Location aLoc;
      Handle(Poly_Triangulation) aT = BRep_Tool::Triangulation(aFace, aLoc);
      const TColgp_Array1OfPnt& aPoints = aT->Nodes();
      const gp_Trsf& trsf = aLoc.Transformation();

      TColgp_Array1OfPnt pnts(1,2);
      TColgp_Array1OfPnt2d pnts2d(1,2);
      for (i=1; i <= nbEdge; i++) {
        Standard_Integer n1, n2;
        aCheck.GetFreeLink(k, i, n1, n2);
        di << "{" << n1 << " " << n2 << "} ";
        pnts(1) = aPoints(n1).Transformed(trsf);
        pnts(2) = aPoints(n2).Transformed(trsf);
        Handle(Poly_Polygon3D) poly = new Poly_Polygon3D (pnts);
        DrawTrSurf::Set (name, poly);
        DrawTrSurf::Set (name, pnts(1));
        DrawTrSurf::Set (name, pnts(2));
        if (aT->HasUVNodes())
        {
          const TColgp_Array1OfPnt2d& aPoints2d = aT->UVNodes();
          pnts2d(1) = aPoints2d(n1);
          pnts2d(2) = aPoints2d(n2);
          Handle(Poly_Polygon2D) poly2d = new Poly_Polygon2D (pnts2d);
          DrawTrSurf::Set (name, poly2d);
          DrawTrSurf::Set (name, pnts2d(1));
          DrawTrSurf::Set (name, pnts2d(2));
        }
      }
      di << "\n";
    }
  }

  // dump info on cross face errors
  Standard_Integer nbErr = aCheck.NbCrossFaceErrors();
  if (nbErr > 0) {
    di << "cross face errors: {face1, node1, face2, node2, distance}\n";
    for (i=1; i <= nbErr; i++) {
      Standard_Integer iF1, n1, iF2, n2;
      Standard_Real aVal;
      aCheck.GetCrossFaceError(i, iF1, n1, iF2, n2, aVal);
      di << "{" << iF1 << " " << n1 << " " << iF2 << " " << n2 << " " << aVal << "} ";
    }
    di << "\n";
  }

  // dump info on edges
  Standard_Integer nbAsync = aCheck.NbAsyncEdges();
  if (nbAsync > 0) {
    di << "async edges:\n";
    for (i=1; i <= nbAsync; i++) {
      Standard_Integer ie = aCheck.GetAsyncEdgeNum(i);
      di << ie << " ";
    }
    di << "\n";
  }

  // dump info on free nodes
  Standard_Integer nbFreeNodes = aCheck.NbFreeNodes();
  if (nbFreeNodes > 0) {
    di << "free nodes (in pairs: face / node): \n";
    for (i=1; i <= nbFreeNodes; i++) {
      Standard_Integer iface, inode;
      aCheck.GetFreeNodeNum(i, iface, inode);

      const TopoDS_Face& aFace = TopoDS::Face(aMapF.FindKey(iface));
      TopLoc_Location aLoc;
      Handle(Poly_Triangulation) aT = BRep_Tool::Triangulation(aFace, aLoc);
      const TColgp_Array1OfPnt& aPoints = aT->Nodes();
      const gp_Trsf& trsf = aLoc.Transformation();
      DrawTrSurf::Set (name, aPoints(inode).Transformed(trsf));
      if (aT->HasUVNodes())
      {
        DrawTrSurf::Set (name, aT->UVNodes()(inode));
      }

      di << "{" << iface << " " << inode << "} ";
    }
    di << "\n";
  }

  const Standard_Integer aNbSmallTriangles = isToFindSmallTriangles? aCheck.NbSmallTriangles() : 0;
  if (aNbSmallTriangles > 0)
  {
    di << "triangles with null area (in pairs: face / triangle): \n";
    for (i = 1; i <= aNbSmallTriangles; i++)
    {
      Standard_Integer aFaceId = 0, aTriID = 0;
      aCheck.GetSmallTriangle(i, aFaceId, aTriID);

      const TopoDS_Face& aFace = TopoDS::Face(aMapF.FindKey(aFaceId));
      TopLoc_Location aLoc;
      const gp_Trsf& aTrsf = aLoc.Transformation();
      const Handle(Poly_Triangulation) aT = BRep_Tool::Triangulation(aFace, aLoc);
      const Poly_Triangle &aTri = aT->Triangle(aTriID);
      Standard_Integer aN1, aN2, aN3;
      aTri.Get(aN1, aN2, aN3);
      const TColgp_Array1OfPnt& aPoints = aT->Nodes();

      TColgp_Array1OfPnt aPoles(1, 4);
      aPoles(1) = aPoles(4) = aPoints(aN1).Transformed(aTrsf);
      aPoles(2) = aPoints(aN2).Transformed(aTrsf);
      aPoles(3) = aPoints(aN3).Transformed(aTrsf);

      TColStd_Array1OfInteger aMults(1, 4);
      aMults(1) = aMults(4) = 2;
      aMults(2) = aMults(3) = 1;

      TColStd_Array1OfReal aKnots(1, 4);
      aKnots(1) = 1.0;
      aKnots(2) = 2.0;
      aKnots(3) = 3.0;
      aKnots(4) = 4.0;
      
      Handle(Geom_BSplineCurve) aBS = new Geom_BSplineCurve(aPoles, aKnots, aMults, 1);

      DrawTrSurf::Set(name, aBS);

      if (aT->HasUVNodes())
      {
        TColgp_Array1OfPnt2d aPoles2d(1, 4);
        aPoles2d(1) = aPoles2d(4) = aT->UVNodes()(aN1);
        aPoles2d(2) = aT->UVNodes()(aN2);
        aPoles2d(3) = aT->UVNodes()(aN3);

        Handle(Geom2d_BSplineCurve) aBS2d = new Geom2d_BSplineCurve(aPoles2d, aKnots, aMults, 1);

        DrawTrSurf::Set(name, aBS2d);
      }

      di << "{" << aFaceId << " " << aTriID << "} ";
    }

    di << "\n";
  }

  // output errors summary to DRAW
  if (nbFree > 0 ||
      nbErr > 0 ||
      nbAsync > 0 ||
      nbFreeNodes > 0 ||
      (aNbSmallTriangles > 0))
  {
    di << "Free_links " << nbFree
      << " Cross_face_errors " << nbErr
      << " Async_edges " << nbAsync
      << " Free_nodes " << nbFreeNodes
      << " Small triangles " << aNbSmallTriangles << "\n";
  }

  Standard_Integer aFaceId = 1;
  TopExp_Explorer aFaceExp(shape, TopAbs_FACE);
  for ( ; aFaceExp.More(); aFaceExp.Next(), ++aFaceId)
  {
    const TopoDS_Shape& aShape = aFaceExp.Current();
    const TopoDS_Face& aFace = TopoDS::Face(aShape);

    TopLoc_Location aLoc;
    Handle(Poly_Triangulation) aT = BRep_Tool::Triangulation(aFace, aLoc);

    // Iterate boundary edges
    NCollection_Map<BRepMesh_Edge> aBoundaryEdgeMap;
    TopExp_Explorer anExp(aShape, TopAbs_EDGE);
    for ( ; anExp.More(); anExp.Next() )
    {
      TopLoc_Location anEdgeLoc;
      const TopoDS_Edge& anEdge = TopoDS::Edge(anExp.Current());
      Handle(Poly_PolygonOnTriangulation) aPoly = BRep_Tool::PolygonOnTriangulation(anEdge, aT, aLoc);
      if (aPoly.IsNull())
      {
        continue;
      }

      const TColStd_Array1OfInteger& anIndices = aPoly->Nodes();
      Standard_Integer aLower  = anIndices.Lower(); 
      Standard_Integer anUpper = anIndices.Upper();

      Standard_Integer aPrevNode = -1;
      for (Standard_Integer j = aLower; j <= anUpper; ++j)
      {
        Standard_Integer aNodeIdx = anIndices.Value(j);
        if (j != aLower)
        {
          BRepMesh_Edge aLink(aPrevNode, aNodeIdx, BRepMesh_Frontier);
          aBoundaryEdgeMap.Add(aLink);
        }
        aPrevNode = aNodeIdx;
      }
    }

    if (aBoundaryEdgeMap.Size() == 0)
    {
      break;
    }

    const Poly_Array1OfTriangle& aTris = aT->Triangles();
    NCollection_Map<BRepMesh_Edge> aFreeEdgeMap;
    Standard_Integer aTriNum = aTris.Length();
    for ( Standard_Integer aTriIndx = 1; aTriIndx <= aTriNum; aTriIndx++ )
    {
      const Poly_Triangle& aTri = aTris(aTriIndx);
      Standard_Integer aTriNodes[3] = { aTri.Value(1), aTri.Value(2), aTri.Value(3)};

      for (Standard_Integer j = 1; j <= 3; ++j)
      {
        Standard_Integer aLastId  = aTriNodes[j % 3];
        Standard_Integer aFirstId = aTriNodes[j - 1];

        BRepMesh_Edge aLink(aFirstId, aLastId, BRepMesh_Free);
        if (!aBoundaryEdgeMap.Contains(aLink))
        {
          if (!aFreeEdgeMap.Add(aLink))
          {
            aFreeEdgeMap.Remove(aLink);
          }
        }
      }
    }

    if (aFreeEdgeMap.Size() != 0)
    {
      di << "Not connected mesh inside face " << aFaceId << "\n";

      const TColgp_Array1OfPnt& aPoints = aT->Nodes();
      const gp_Trsf& trsf = aLoc.Transformation();

      TColgp_Array1OfPnt pnts(1,2);
      TColgp_Array1OfPnt2d pnts2d(1,2);
      NCollection_Map<BRepMesh_Edge>::Iterator aMapIt(aFreeEdgeMap);
      for (; aMapIt.More(); aMapIt.Next())
      {
        const BRepMesh_Edge& aLink = aMapIt.Key();
        di << "{" << aLink.FirstNode() << " " << aLink.LastNode() << "} ";
        pnts(1) = aPoints(aLink.FirstNode()).Transformed(trsf);
        pnts(2) = aPoints(aLink.LastNode()).Transformed(trsf);
        Handle(Poly_Polygon3D) poly = new Poly_Polygon3D (pnts);
        DrawTrSurf::Set (name, poly);
        DrawTrSurf::Set (name, pnts(1));
        DrawTrSurf::Set (name, pnts(2));
        if (aT->HasUVNodes())
        {
          const TColgp_Array1OfPnt2d& aPoints2d = aT->UVNodes();
          pnts2d(1) = aPoints2d(aLink.FirstNode());
          pnts2d(2) = aPoints2d(aLink.LastNode());
          Handle(Poly_Polygon2D) poly2d = new Poly_Polygon2D (pnts2d);
          DrawTrSurf::Set (name, poly2d);
          DrawTrSurf::Set (name, pnts2d(1));
          DrawTrSurf::Set (name, pnts2d(2));
        }
      }
      di << "\n";
    }
  }
  return 0;
}

//=======================================================================
//function : mpparallel
//purpose  :
//=======================================================================
static int mpparallel (Draw_Interpretor& /*di*/, Standard_Integer argc, const char** argv)
{
  if (argc == 2)
  {
    Standard_Boolean isParallelOn = Draw::Atoi (argv[1]) == 1;
    BRepMesh_IncrementalMesh::SetParallelDefault (isParallelOn);
  }
  std::cout << "Incremental Mesh, multi-threading "
            << (BRepMesh_IncrementalMesh::IsParallelDefault() ? "ON\n" : "OFF\n");
  return 0;
}