// 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.

//:S4134 abv 10.03.99: working methods moved from package TopoDSToGBWire
//:j1 modified by abv 22 Oct 98: CSR BUC60401
// - unused parts of code dropped
// - fixed trimming of circles and ellipses (radians used instead of degrees)
//szv#4 S4163

#include <Adaptor3d_CurveOnSurface.hxx>
#include <BRep_Tool.hxx>
#include <BRepAdaptor_Curve.hxx>
#include <BRepTools.hxx>
#include <Geom2d_Line.hxx>
#include <Geom_BSplineCurve.hxx>
#include <Geom_Line.hxx>
#include <Geom_Plane.hxx>
#include <Geom_Surface.hxx>
#include <Geom_TrimmedCurve.hxx>
#include <GeomToStep_MakeCartesianPoint.hxx>
#include <GeomToStep_MakeCurve.hxx>
#include <GeomToStep_MakeLine.hxx>
#include <gp_Vec.hxx>
#include <Precision.hxx>
#include <Standard_ErrorHandler.hxx>
#include <Standard_NullObject.hxx>
#include <StdFail_NotDone.hxx>
#include <StepGeom_CartesianPoint.hxx>
#include <StepGeom_Line.hxx>
#include <StepGeom_TrimmedCurve.hxx>
#include <StepGeom_TrimmingSelect.hxx>
#include <TColgp_Array1OfPnt.hxx>
#include <TColStd_Array1OfInteger.hxx>
#include <TColStd_Array1OfReal.hxx>
#include <TopExp_Explorer.hxx>
#include <TopoDS.hxx>
#include <TopoDS_Edge.hxx>
#include <TopoDS_Iterator.hxx>
#include <TopoDS_Shape.hxx>
#include <TopoDSToStep_Tool.hxx>
#include <TopoDSToStep_WireframeBuilder.hxx>
#include <Transfer_FinderProcess.hxx>

// ============================================================================
// Method  : TopoDSToStep_Builder::TopoDSToStep_Builder
// Purpose :
// ============================================================================
TopoDSToStep_WireframeBuilder::TopoDSToStep_WireframeBuilder()
: myError(TopoDSToStep_BuilderOther)
{
  done = Standard_False;
}

// ============================================================================
// Method  : TopoDSToStep_Builder::TopoDSToStep_Builder
// Purpose :
// ============================================================================

 TopoDSToStep_WireframeBuilder::TopoDSToStep_WireframeBuilder(const TopoDS_Shape& aShape, TopoDSToStep_Tool& aTool, const Handle(Transfer_FinderProcess)& FP)
{
  done = Standard_False;
  Init(aShape, aTool, FP);
}

void TopoDSToStep_WireframeBuilder::Init(const TopoDS_Shape& aShape, TopoDSToStep_Tool& /* T */, const Handle(Transfer_FinderProcess)& /* FP */)
{
  Handle(TColStd_HSequenceOfTransient) itemList =
    new TColStd_HSequenceOfTransient();
  MoniTool_DataMapOfShapeTransient aPmsMap;
  done = GetTrimmedCurveFromShape(aShape, aPmsMap, itemList);
  myResult = itemList;
}

// ============================================================================
// Method  : TopoDSToStep_Builder::Error
// Purpose :
// ============================================================================

TopoDSToStep_BuilderError TopoDSToStep_WireframeBuilder::Error() const 
{
	return myError;
}

// ============================================================================
// Method  : TopoDSToStep_Builder::Value
// Purpose :
// ============================================================================

const Handle(TColStd_HSequenceOfTransient)& TopoDSToStep_WireframeBuilder::Value() const 
{
  StdFail_NotDone_Raise_if (!done, "TopoDSToStep_WireframeBuilder::Value() - no result");
  return myResult;
}


// ============================================================================
//:S4134: abv 10 Mar 99: the methods below moved from package TopoDSToGBWire

#define Nbpt 23

static Handle(StepGeom_TrimmedCurve) MakeTrimmedCurve (const Handle(StepGeom_Curve) &C,
						       const Handle(StepGeom_CartesianPoint) P1, 
						       const Handle(StepGeom_CartesianPoint) P2, 
						       Standard_Real trim1,
						       Standard_Real trim2,
						       Standard_Boolean sense)
{
  Handle(StepGeom_HArray1OfTrimmingSelect) aSTS1 =
    new StepGeom_HArray1OfTrimmingSelect(1,2);
  StepGeom_TrimmingSelect tSel;
  tSel.SetValue(P1);
  aSTS1->SetValue(1,tSel);
  tSel.SetParameterValue(trim1);
  aSTS1->SetValue(2,tSel);
    
  Handle(StepGeom_HArray1OfTrimmingSelect) aSTS2 =
    new StepGeom_HArray1OfTrimmingSelect(1,2);
  tSel.SetValue(P2);
  aSTS2->SetValue(1,tSel);
  tSel.SetParameterValue(trim2);
  aSTS2->SetValue(2,tSel);
    
  Handle(TCollection_HAsciiString) empty = 
      new TCollection_HAsciiString("");
  Handle(StepGeom_TrimmedCurve) pmsTC = new StepGeom_TrimmedCurve;
  pmsTC->Init(empty,C,aSTS1,aSTS2,sense,StepGeom_tpParameter);
  return pmsTC;
}
  
Standard_Boolean TopoDSToStep_WireframeBuilder::
  GetTrimmedCurveFromEdge(const TopoDS_Edge& theEdge,
                          const TopoDS_Face& theFace,
                          MoniTool_DataMapOfShapeTransient& theMap,
                          Handle(TColStd_HSequenceOfTransient)& theCurveList) const
{
  if (theEdge.Orientation() == TopAbs_INTERNAL ||
      theEdge.Orientation() == TopAbs_EXTERNAL )
  {
#ifdef OCCT_DEBUG
    std::cout <<"Warning: TopoDSToStep_WireframeBuilder::GetTrimmedCurveFromEdge: Edge is internal or external; dropped" << std::endl;
#endif
    return Standard_False;
  }
  //szv#4:S4163:12Mar99 SGI warns
  TopoDS_Shape aSh = theEdge.Oriented(TopAbs_FORWARD);
  TopoDS_Edge anEdge = TopoDS::Edge ( aSh );

  // resulting curve
  Handle(StepGeom_Curve) aSGC;
  if (const Handle(Standard_Transient)* aTransient = theMap.Seek(anEdge))
  {
    aSGC = Handle(StepGeom_Curve)::DownCast(*aTransient);
  }

  BRepAdaptor_Curve aCA;
  try 
  {
    OCC_CATCH_SIGNALS
    aCA.Initialize (anEdge);
  }
  catch (Standard_NullObject const&) 
  {
    return Standard_False;
  }

  TopoDS_Vertex aVFirst, aVLast;
  Handle(StepGeom_CartesianPoint) aSGCP1, aSGCP2;
  for (TopExp_Explorer anExp(anEdge, TopAbs_VERTEX); anExp.More(); anExp.Next())
  {
    TopoDS_Vertex aVertex = TopoDS::Vertex(anExp.Value());
    gp_Pnt aGpP = BRep_Tool::Pnt(aVertex);
    if (aVertex.Orientation() == TopAbs_FORWARD)
    {
      aVFirst = aVertex;
      // 1.point for trimming
      GeomToStep_MakeCartesianPoint aGTSMCP(aGpP);
      aSGCP1 = aGTSMCP.Value();
    }
    if (aVertex.Orientation() == TopAbs_REVERSED)
    {
      aVLast = aVertex;
      // 2.point for trimming
      GeomToStep_MakeCartesianPoint aGTSMCP(aGpP);
      aSGCP2 = aGTSMCP.Value();
    }
  }

  Standard_Real aFirst, aLast;
  Handle(Geom_Curve) aC = BRep_Tool::Curve(anEdge, aFirst, aLast);

  if (!aC.IsNull())
  {
    if (aC->IsKind(STANDARD_TYPE(Geom_TrimmedCurve)))
    {
      aC = Handle(Geom_TrimmedCurve)::DownCast(aC)->BasisCurve();
    }
    GeomToStep_MakeCurve aGTSMC(aC);
    if (!aGTSMC.IsDone())
    {
      return Standard_False;
    }
    Handle(StepGeom_Curve) aPMSC = aGTSMC.Value();

    // trim the curve
    Standard_Real aTrim1 = aCA.FirstParameter();
    Standard_Real aTrim2 = aCA.LastParameter();

    if (aVFirst.IsNull() && aVLast.IsNull() && Precision::IsInfinite(aFirst) && Precision::IsInfinite(aLast))
    {
      GeomToStep_MakeCurve aCurveMaker(aC);
      if (aCurveMaker.IsDone())
      {
        aSGC = aCurveMaker.Value();
        theCurveList->Append(aSGC);
        return Standard_True;
      }
      return Standard_False;
    }
    if (aVFirst.IsNull())
    {
      GeomToStep_MakeCartesianPoint aGTSMCP(aCA.Value(aFirst));
      aSGCP1 = aGTSMCP.Value();
    }
    if (aVLast.IsNull())
    {
      GeomToStep_MakeCartesianPoint aGTSMCP(aCA.Value(aLast));
      aSGCP2 = aGTSMCP.Value();
    }

    /* //:j1 abv 22 Oct 98: radians are used in the produced STEP file (at least by default)
       if(C->IsKind(STANDARD_TYPE(Geom_Circle)) ||
           C->IsKind(STANDARD_TYPE(Geom_Ellipse))) {
          Standard_Real fact = 180. / M_PI;
          trim1 = trim1 * fact;
          trim2 = trim2 * fact;
        }
    */
    aSGC = MakeTrimmedCurve(aPMSC, aSGCP1, aSGCP2, aTrim1, aTrim2, Standard_True);
  }
  else
  {

    // -------------------------
    // a 3D Curve is constructed
    // -------------------------

    Standard_Boolean aIPlan = Standard_False;
    if (!theFace.IsNull())
    {
      Standard_Real aCF, aCL;
      Handle(Geom2d_Curve) aC2d = BRep_Tool::CurveOnSurface(anEdge, theFace, aCF, aCL);
      Handle(Geom_Surface) aS = BRep_Tool::Surface(theFace);
      if (aS->IsKind(STANDARD_TYPE(Geom_Plane)) && aC2d->IsKind(STANDARD_TYPE(Geom2d_Line)))
      {
        aIPlan = Standard_True;
      }
    }

    // to be modified : cf and cl are the topological trimming parameter
    // these are computed after ! (U1 and U2) -> cf and cl instead
    if (aIPlan)
    {
      gp_Pnt aPnt1 = aCA.Value(aCA.FirstParameter()), aPnt2 = aCA.Value(aCA.LastParameter());
      gp_Vec aV(aPnt1, aPnt2);
      Standard_Real aLength = aV.Magnitude();
      if (aLength >= Precision::Confusion())
      {
        Handle(Geom_Line) aL = new Geom_Line(aPnt1, gp_Dir(aV));
        GeomToStep_MakeLine aGTSML(aL);
        aSGC = aGTSML.Value();
        aSGC = MakeTrimmedCurve(aGTSML.Value(), aSGCP1, aSGCP2, 0, aLength, Standard_True);
      }
#ifdef OCCT_DEBUG
      else std::cout << "Warning: TopoDSToStep_WireframeBuilder::GetTrimmedCurveFromEdge: Null-length curve not mapped" << std::endl;
#endif
    }
    else
    {         
      TColgp_Array1OfPnt aPoints(1, Nbpt);
      TColStd_Array1OfReal aKnots(1, Nbpt);
      TColStd_Array1OfInteger aMult(1, Nbpt);
      Standard_Real aU1 = aCA.FirstParameter();
      Standard_Real aU2 = aCA.LastParameter();
      for (Standard_Integer i = 1; i <= Nbpt; i++)
      {
        Standard_Real aU = aU1 + (i - 1) * (aU2 - aU1) / (Nbpt - 1);
        gp_Pnt aP = aCA.Value(aU);
        aPoints.SetValue(i, aP);
        aKnots.SetValue(i, aU);
        aMult.SetValue(i, 1);
      }
      aPoints.SetValue(1, BRep_Tool::Pnt(aVFirst));
      aPoints.SetValue(Nbpt, BRep_Tool::Pnt(aVLast));
      aMult.SetValue(1, 2);
      aMult.SetValue(Nbpt, 2);
      Handle(Geom_Curve) aBSCurve = new Geom_BSplineCurve(aPoints, aKnots, aMult, 1);
      GeomToStep_MakeCurve aGTSMC(aBSCurve);
      aSGC = aGTSMC.Value();
    }
  }

  if (aSGC.IsNull())
  {
    return Standard_False;
  }

  theMap.Bind(anEdge, aSGC);
  theCurveList->Append(aSGC);
  return Standard_True;
}


Standard_Boolean TopoDSToStep_WireframeBuilder::
  GetTrimmedCurveFromFace(const TopoDS_Face& aFace, 
            MoniTool_DataMapOfShapeTransient& aMap, 
            Handle(TColStd_HSequenceOfTransient)& aCurveList) const
{
  TopoDS_Shape curShape;
  TopoDS_Edge  curEdge;
  TopExp_Explorer  exp;
  Standard_Boolean result = Standard_False; //szv#4:S4163:12Mar99 `done` hid one from this, initialisation needed

  for (exp.Init(aFace,TopAbs_EDGE); exp.More(); exp.Next()){
    curShape = exp.Current();
    curEdge  = TopoDS::Edge(curShape);
    if (GetTrimmedCurveFromEdge(curEdge, aFace, aMap, aCurveList)) result = Standard_True;
  }
  return result;
}

Standard_Boolean TopoDSToStep_WireframeBuilder::
  GetTrimmedCurveFromShape(const TopoDS_Shape& aShape, 
			   MoniTool_DataMapOfShapeTransient& aMap,  
			   Handle(TColStd_HSequenceOfTransient)& aCurveList) const
{
  TopoDS_Iterator  It;
  Standard_Boolean result = Standard_False; //szv#4:S4163:12Mar99 `done` hid one from this, initialisation needed

  //szv#4:S4163:12Mar99 optimized
  switch (aShape.ShapeType()) {
    case TopAbs_EDGE : {
      const TopoDS_Edge& curEdge = TopoDS::Edge(aShape);
      TopoDS_Face nulFace;
      result = GetTrimmedCurveFromEdge(curEdge, nulFace, aMap, aCurveList);
      break;
    }
    case TopAbs_WIRE : {
      TopoDS_Face nulFace;
      TopoDS_Shape curShape;
      TopoDS_Edge  curEdge;
      TopExp_Explorer  exp;

      for (exp.Init(aShape,TopAbs_EDGE); exp.More(); exp.Next()){
	curShape = exp.Current();
	curEdge  = TopoDS::Edge(curShape);
	if (GetTrimmedCurveFromEdge(curEdge, nulFace, aMap, aCurveList)) result = Standard_True;
      }
      break;
    }
    case TopAbs_FACE : {
      const TopoDS_Face& curFace = TopoDS::Face(aShape);
      result = GetTrimmedCurveFromFace(curFace, aMap, aCurveList);
      break;
    }
    case TopAbs_SHELL : {
      TopoDS_Shell Sh = TopoDS::Shell(aShape);	  
      It.Initialize(Sh);
      for (;It.More();It.Next()) {
	TopoDS_Face curFace = TopoDS::Face(It.Value());
	if (GetTrimmedCurveFromFace(curFace, aMap, aCurveList)) result = Standard_True;
#ifdef OCCT_DEBUG
	if(!result) {
	  std::cout << "ERROR extracting trimmedCurve from Face" << std::endl;
	  //BRepTools::Dump(curFace,std::cout);  std::cout<<std::endl;
	}
#endif
      }
      break;
    }
    case TopAbs_SOLID : {
      It.Initialize(aShape);
      for (;It.More();It.Next()) {
	if  (It.Value().ShapeType() == TopAbs_SHELL) {
	  if (GetTrimmedCurveFromShape(It.Value(), aMap, aCurveList)) result = Standard_True;
	}
      } 
      break;
    }
    case TopAbs_COMPOUND : {
      It.Initialize(aShape);
      for (;It.More();It.Next()) {
/*	  if  ((It.Value().ShapeType() == TopAbs_SHELL) ||
	       (It.Value().ShapeType() == TopAbs_COMPOUND)) {
	    result = GetTrimmedCurveFromShape(It.Value(), aMap, aCurveList);
	    break;
	  }
	  else if (It.Value().ShapeType() == TopAbs_FACE) {
	    result = GetTrimmedCurveFromFace(TopoDS::Face(It.Value()), aMap, aCurveList);
	    break;
	  } */
	if (GetTrimmedCurveFromShape(It.Value(), aMap, aCurveList)) result = Standard_True;
      }
      break;
    }
    default : break;
  }
  return result;
}
