// Created on: 1993-10-14
// 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.

// Modified by skv - Fri Mar  4 15:50:09 2005
// Add methods for supporting history.

#include <BRep_TEdge.hxx>
#include <BRepLib.hxx>
#include <BRepPrimAPI_MakeRevol.hxx>
#include <BRepSweep_Revol.hxx>
#include <gp_Ax1.hxx>
#include <TopExp_Explorer.hxx>
#include <TopoDS_Shape.hxx>
#include <TopTools_DataMapOfShapeListOfShape.hxx>
#include <BRepTools_ReShape.hxx>
#include <Geom_TrimmedCurve.hxx>
#include <GeomAdaptor_SurfaceOfRevolution.hxx>
#include <GeomAdaptor_HCurve.hxx>
#include <Extrema_ExtCC.hxx>
#include <Extrema_POnCurv.hxx>
#include <Geom_Line.hxx>

// perform checks on the argument
static const TopoDS_Shape& check(const TopoDS_Shape& S)
{
 BRepLib::BuildCurves3d(S);
   return S;
}

//=======================================================================
//function : BRepPrimAPI_MakeRevol
//purpose  : 
//=======================================================================

BRepPrimAPI_MakeRevol::BRepPrimAPI_MakeRevol(const TopoDS_Shape& S, 
				     const gp_Ax1& A, 
				     const Standard_Real D, 
             const Standard_Boolean Copy) : 
             myRevol(check(S), A, D, Copy),
             myIsBuild(Standard_False)

{
  if (!CheckValidity(check(S), A))
  {
    myShape.Nullify();
    myIsBuild = Standard_True;
  }
  else
  {
    Build();
  }
}


//=======================================================================
//function : BRepPrimAPI_MakeRevol
//purpose  : 
//=======================================================================

BRepPrimAPI_MakeRevol::BRepPrimAPI_MakeRevol(const TopoDS_Shape& S, 
				     const gp_Ax1& A, 
             const Standard_Boolean Copy) :
             
             myRevol(check(S), A, 2. * M_PI, Copy),
              myIsBuild(Standard_False)
{

  if (!CheckValidity(check(S), A))
  {
    myShape.Nullify();
    myIsBuild = Standard_True;
  }
  else
  {
    Build();
  }
}


//=======================================================================
//function : Revol
//purpose  : 
//=======================================================================

const BRepSweep_Revol&  BRepPrimAPI_MakeRevol::Revol() const 
{
  return myRevol;
}


//=======================================================================
//function : Build
//purpose  : 
//=======================================================================

void  BRepPrimAPI_MakeRevol::Build()
{
  if (myIsBuild)
  {
    return;
  }
  myShape = myRevol.Shape();
  BRepLib::UpdateInnerTolerances(myShape);
  
  Done();
  myIsBuild = Standard_True;

  myHist.Nullify();
  myDegenerated.Clear();
  TopTools_DataMapOfShapeListOfShape aDegE;
  BRep_Builder aBB;

  TopExp_Explorer anExp(myShape, TopAbs_EDGE);
  //Problem is that some degenerated edges can be shared by different faces.
  //It is not valid for correct shape.
  //To solve problem it is possible to copy shared degenerated edge for each face, which has it, and 
  //replace shared edge by its copy
  for (; anExp.More(); anExp.Next()) {
    const TopoDS_Shape &anEdge = anExp.Current();
    Handle(BRep_TEdge)  aTEdge = Handle(BRep_TEdge)::DownCast(anEdge.TShape());

    if (aTEdge->Degenerated())
    {
      TopTools_ListOfShape* anL = aDegE.ChangeSeek(anEdge);
      if (anL)
      {
        //Make the copy if degenerated edge occurs more then once
        TopoDS_Shape aCopyE = anEdge.EmptyCopied();
        aCopyE.Orientation(TopAbs_FORWARD);
        TopoDS_Iterator aVIter(anEdge.Oriented(TopAbs_FORWARD), Standard_False);
        for (; aVIter.More(); aVIter.Next())
        {
          aBB.Add(aCopyE, aVIter.Value());
        }
        aCopyE.Orientation(anEdge.Orientation());
        anL->Append(aCopyE);
        myDegenerated.Append(aCopyE);
      }
      else
      {
        anL = aDegE.Bound(anEdge, TopTools_ListOfShape());
        anL->Append(anEdge);
        myDegenerated.Append(anEdge);
      }
    }
  }
  if (!myDegenerated.IsEmpty())
  {
    BRepTools_ReShape aSubs;
    TopTools_DataMapOfShapeListOfShape aDegF;
    Standard_Boolean isReplaced = Standard_False;
    anExp.Init(myShape, TopAbs_FACE);
    //Replace degenerated edge by its copies for different faces
    //First, for each face list of d.e. is created
    for (; anExp.More(); anExp.Next())
    {
      const TopoDS_Shape& aF = anExp.Current();
      TopExp_Explorer anExpE(aF, TopAbs_EDGE);
      for (; anExpE.More(); anExpE.Next())
      {
        const TopoDS_Shape &anE = anExpE.Current();
        if (BRep_Tool::Degenerated(TopoDS::Edge(anE)))
        {
          TopTools_ListOfShape* anL = aDegF.ChangeSeek(aF);
          if (!anL)
          {
            anL = aDegF.Bound(aF, TopTools_ListOfShape());
          }
          anL->Append(anE);
        }
      }
    }
    //
    //Second, replace edges by copies using ReShape
    BRepTools_ReShape aSubsF;
    TopTools_DataMapIteratorOfDataMapOfShapeListOfShape aFIter(aDegF);
    for (; aFIter.More(); aFIter.Next())
    {
      aSubs.Clear();
      isReplaced = Standard_False;
      const TopoDS_Shape& aF = aFIter.Key();
      const TopTools_ListOfShape& aDEL = aFIter.ChangeValue();
      TopTools_ListIteratorOfListOfShape anEIter(aDEL);
      for (; anEIter.More(); anEIter.Next())
      {
        const TopoDS_Shape& anE = anEIter.Value();
        if (aDegE.IsBound(anE))
        {
          TopTools_ListOfShape& aCEL = aDegE.ChangeFind(anE);
          TopTools_ListIteratorOfListOfShape anIt(aCEL);
          for (; anIt.More(); anIt.Next())
          {
            if (anIt.Value().IsEqual(anE))
            {
              //First occurence of initial deg. edge is not replaced
              aCEL.Remove(anIt);
              break;
            }
            if (anIt.Value().Orientation() == anE.Orientation())
            {
              //All other occurences of anE are replaced by any copy
              //with suitable orientation
              isReplaced = Standard_True;
              aSubs.Replace(anE, anIt.Value());
              aCEL.Remove(anIt);
              break;
            }
          }
        }
      }
      if (isReplaced)
      {
        TopoDS_Shape aNF = aSubs.Apply(aF);
        aSubsF.Replace(aF, aNF);
        if (myHist.IsNull())
        {
          myHist = aSubs.History();
        }
        else
        {
          myHist->Merge(aSubs.History());
        }
        myShape = aSubsF.Apply(myShape);
        myHist->Merge(aSubsF.History());
        //Pair aF->aNF is in history after first replacing of edge by aNF = aSubs.Apply(aF)
        //After merging history for replacing faces, modified list for aF contains two exemplar of aNF
        //So, using ReplaceModified clears modified list for aF and leaves only one exemplar of aNF
        myHist->ReplaceModified(aF, aNF);
        aSubsF.Clear();
      }
    }
  }
}
//=======================================================================
//function : IsIntersect
//purpose  : used in CheckValidity to find out is there
//           intersection between curve and axe of revolution
//=======================================================================
static Standard_Boolean IsIntersect(const Handle(Adaptor3d_HCurve)& theC, 
                                    const gp_Ax1& theAxe)
{
  const gp_Lin anAxis(theAxe);
  //Quick test for circle
  if (theC->GetType() == GeomAbs_Circle)
  {
    gp_Circ aCirc = theC->Circle();
    const gp_Pnt& aCentr = aCirc.Location();
    Standard_Real anR2 = aCirc.Radius();
    anR2 -= Precision::Confusion();
    anR2 *= anR2;
    if (anAxis.SquareDistance(aCentr) > anR2)
    {
      return Standard_False;
    }
  }
  const Handle(Geom_Line) aL = new Geom_Line(anAxis);
  const GeomAdaptor_Curve aLin(aL);
  const Standard_Real aParTol = theC->Resolution(Precision::Confusion());
  const Standard_Real aParF = theC->FirstParameter() + aParTol,
                      aParL = theC->LastParameter() - aParTol;

  Extrema_ExtCC anExtr(theC->Curve(), aLin);
  anExtr.Perform();
  if (anExtr.IsDone() && anExtr.NbExt() > 0)
  {
    Extrema_POnCurv aP1, aP2;
    for (Standard_Integer i = 1; i <= anExtr.NbExt(); i++)
    {
      if (anExtr.SquareDistance(i) > Precision::SquareConfusion())
      {
        continue;
      }
      anExtr.Points(i, aP1, aP2);
      if ((aParF < aP1.Parameter()) && (aP1.Parameter() < aParL))
      {
        return Standard_True;
      }
    }
  }
  return Standard_False;
}

//=======================================================================
//function : CheckValidity
//purpose  : 
//=======================================================================

Standard_Boolean BRepPrimAPI_MakeRevol::CheckValidity(const TopoDS_Shape& theShape,
                                                      const gp_Ax1& theA)
{
  TopExp_Explorer anExp(theShape, TopAbs_EDGE);
  Standard_Boolean IsValid = Standard_True;
  for (; anExp.More(); anExp.Next())
  {
    const TopoDS_Edge& anE = TopoDS::Edge(anExp.Current());

    if (BRep_Tool::Degenerated(anE))
    {
      continue;
    }

    TopLoc_Location L;
    Standard_Real First, Last;
    Handle(Geom_Curve) C = BRep_Tool::Curve(anE, L, First, Last);
    gp_Trsf Tr = L.Transformation();
    C = Handle(Geom_Curve)::DownCast(C->Copy());
    C = new Geom_TrimmedCurve(C, First, Last);
    C->Transform(Tr);

    Handle(GeomAdaptor_HCurve) HC = new GeomAdaptor_HCurve();
    HC->ChangeCurve().Load(C, First, Last);
    //Checking coinsidence axe of revolution and basis curve
    //This code is taken directly from GeomAdaptor_SurfaceOfRevolution
    Standard_Integer Ratio = 1;
    Standard_Real Dist;
    gp_Pnt PP;
    do {
      PP = HC->Value(First + (Last - First) / Ratio);
      Dist = gp_Lin(theA).Distance(PP);
      Ratio++;
    } while (Dist < Precision::Confusion() && Ratio < 100);
    //
    if (Ratio >= 100) // edge coinsides with axes
    {
      IsValid = Standard_True; //Such edges are allowed by revol algo and treated
                               //by special way, so they must be concidered as valid
    }
    else
    {
      IsValid = !IsIntersect(HC, theA);
    }
    if (!IsValid)
    {
      break;
    }
  }
  //
  return IsValid;
}


//=======================================================================
//function : FirstShape
//purpose  : 
//=======================================================================

TopoDS_Shape BRepPrimAPI_MakeRevol::FirstShape()
{
  return myRevol.FirstShape();
}


//=======================================================================
//function : LastShape
//purpose  : 
//=======================================================================

TopoDS_Shape BRepPrimAPI_MakeRevol::LastShape()
{
  return myRevol.LastShape();
}

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

  if (!myRevol.IsUsed(S))
  {
    return myGenerated;
  }

  TopoDS_Shape aGS = myRevol.Shape(S);
  if (!aGS.IsNull())
  { 
    if (BRepTools_History::IsSupportedType(aGS))
    {
      if (aGS.ShapeType() == TopAbs_EDGE)
      {
        Standard_Boolean isDeg = BRep_Tool::Degenerated(TopoDS::Edge(aGS));
        if (isDeg)
        {
          TopTools_ListIteratorOfListOfShape anIt(myDegenerated);
          for (; anIt.More(); anIt.Next())
          {
            if (aGS.IsSame(anIt.Value()))
            {
              myGenerated.Append(aGS);
              if (!myHist.IsNull())
              {
                TopTools_ListIteratorOfListOfShape anIt1(myHist->Modified(aGS));
                for (; anIt1.More(); anIt1.Next())
                {
                  myGenerated.Append(anIt1.Value());
                }
                return myGenerated;
              }
            }
          }
          return myGenerated;
        }
      }
      //
      if (myHist.IsNull())
      {
        myGenerated.Append(aGS);
        return myGenerated;
      }
      //
      if (myHist->Modified(aGS).IsEmpty())
      {
        myGenerated.Append(aGS);
        return myGenerated;
      }
      //
      TopTools_ListIteratorOfListOfShape anIt(myHist->Modified(aGS));
      for (; anIt.More(); anIt.Next())
      {
        myGenerated.Append(anIt.Value());
      }
    }
  }
  return myGenerated;
}
//=======================================================================
//function : IsDeleted
//purpose  : 
//=======================================================================
Standard_Boolean BRepPrimAPI_MakeRevol::IsDeleted(const TopoDS_Shape& S)
{
  return !myRevol.IsUsed(S);
}


//=======================================================================
//function : FirstShape
//purpose  : This method returns the shape of the beginning of the revolution,
//           generated with theShape (subShape of the generating shape).
//=======================================================================

TopoDS_Shape BRepPrimAPI_MakeRevol::FirstShape(const TopoDS_Shape &theShape)
{
  return myRevol.FirstShape(theShape);
}


//=======================================================================
//function : LastShape
//purpose  : This method returns the shape of the end of the revolution,
//           generated with theShape (subShape of the generating shape).
//=======================================================================

TopoDS_Shape BRepPrimAPI_MakeRevol::LastShape(const TopoDS_Shape &theShape)
{
  return myRevol.LastShape(theShape);
}

//=======================================================================
//function : HasDegenerated
//purpose  : 
//=======================================================================

Standard_Boolean BRepPrimAPI_MakeRevol::HasDegenerated () const
{
  return (!myDegenerated.IsEmpty());
}


//=======================================================================
//function : Degenerated
//purpose  : 
//=======================================================================

const TopTools_ListOfShape& BRepPrimAPI_MakeRevol::Degenerated () const
{
  return myDegenerated;
}