// Copyright (C) 2007-2015  CEA/DEN, EDF R&D, OPEN CASCADE
//
// Copyright (C) 2003-2007  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
// CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
//
// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
//

//  SMESH SMDS : implementaion of Salome mesh data structure
//
#ifdef _MSC_VER
#pragma warning(disable:4786)
#endif

#include "SMDS_MeshNode.hxx"
#include "SMDS_SpacePosition.hxx"
#include "SMDS_IteratorOfElements.hxx"
#include "SMDS_Mesh.hxx"
#include <vtkUnstructuredGrid.h>

#include "utilities.h"
#include "Utils_SALOME_Exception.hxx"
#include <cassert>

using namespace std;

int SMDS_MeshNode::nbNodes =0;

//=======================================================================
//function : SMDS_MeshNode
//purpose  :
//=======================================================================
SMDS_MeshNode::SMDS_MeshNode() :
  SMDS_MeshElement(-1, -1, 0),
  myPosition(SMDS_SpacePosition::originSpacePosition())
{
  nbNodes++;
}

SMDS_MeshNode::SMDS_MeshNode(int id, int meshId, int shapeId, double x, double y, double z):
  SMDS_MeshElement(id, meshId, shapeId),
  myPosition(SMDS_SpacePosition::originSpacePosition())
{
  nbNodes++;
  init(id, meshId, shapeId, x, y ,z);
}

void SMDS_MeshNode::init(int id, int meshId, int shapeId, double x, double y, double z)
{
  SMDS_MeshElement::init(id, meshId, shapeId);
  myVtkID = id -1;
  assert(myVtkID >= 0);
  //MESSAGE("Node " << myID << " " << myVtkID << " (" << x << ", " << y << ", " << z << ")");
  SMDS_Mesh* mesh = SMDS_Mesh::_meshList[myMeshId];
  SMDS_UnstructuredGrid * grid = mesh->getGrid();
  vtkPoints *points = grid->GetPoints();
  points->InsertPoint(myVtkID, x, y, z);
  SMDS_CellLinks *cellLinks = dynamic_cast<SMDS_CellLinks*>(grid->GetCellLinks());
  assert(cellLinks);
  cellLinks->ResizeForPoint( myVtkID );
}

SMDS_MeshNode::~SMDS_MeshNode()
{
  nbNodes--;
  if ( myPosition && myPosition != SMDS_SpacePosition::originSpacePosition() )
    delete myPosition, myPosition = 0;
}

//=======================================================================
//function : RemoveInverseElement
//purpose  :
//=======================================================================

void SMDS_MeshNode::RemoveInverseElement(const SMDS_MeshElement * parent)
{
  //MESSAGE("RemoveInverseElement " << myID << " " << parent->GetID());
  const SMDS_MeshCell* cell = dynamic_cast<const SMDS_MeshCell*>(parent);
  MYASSERT(cell);
  SMDS_Mesh::_meshList[myMeshId]->getGrid()->RemoveReferenceToCell(myVtkID, cell->getVtkId());
}

//=======================================================================
//function : Print
//purpose  :
//=======================================================================

void SMDS_MeshNode::Print(ostream & OS) const
{
  OS << "Node <" << myID << "> : X = " << X() << " Y = "
     << Y() << " Z = " << Z() << endl;
}

//=======================================================================
//function : SetPosition
//purpose  :
//=======================================================================

void SMDS_MeshNode::SetPosition(const SMDS_PositionPtr& aPos)
{
  if ( myPosition &&
       myPosition != SMDS_SpacePosition::originSpacePosition() &&
       myPosition != aPos )
    delete myPosition;
  myPosition = aPos;
}

//=======================================================================
//function : GetPosition
//purpose  :
//=======================================================================

const SMDS_PositionPtr& SMDS_MeshNode::GetPosition() const
{
  return myPosition;
}

//=======================================================================
/*!
 * \brief Iterator on list of elements
 */
//=======================================================================

class SMDS_MeshNode_MyInvIterator: public SMDS_ElemIterator
{
private:
  SMDS_Mesh* myMesh;
  vtkIdType* myCells;
  int myNcells;
  SMDSAbs_ElementType myType;
  int iter;
  vector<vtkIdType> cellList;

public:
  SMDS_MeshNode_MyInvIterator(SMDS_Mesh *mesh, vtkIdType* cells, int ncells, SMDSAbs_ElementType type) :
    myMesh(mesh), myCells(cells), myNcells(ncells), myType(type), iter(0)
  {
    cellList.reserve( ncells );
    if (type == SMDSAbs_All)
      cellList.assign( cells, cells + ncells );
    else
      for (int i = 0; i < ncells; i++)
      {
        int vtkId = cells[i];
        int smdsId = myMesh->fromVtkToSmds(vtkId);
        const SMDS_MeshElement* elem = myMesh->FindElement(smdsId);
        if (elem->GetType() == type)
        {
          cellList.push_back(vtkId);
        }
      }
    myCells = cellList.empty() ? 0 : &cellList[0];
    myNcells = cellList.size();
  }

  bool more()
  {
    return (iter < myNcells);
  }

  const SMDS_MeshElement* next()
  {
    int vtkId = myCells[iter];
    int smdsId = myMesh->fromVtkToSmds(vtkId);
    const SMDS_MeshElement* elem = myMesh->FindElement(smdsId);
    if (!elem)
    {
      MESSAGE("SMDS_MeshNode_MyInvIterator problem Null element");
      throw SALOME_Exception("SMDS_MeshNode_MyInvIterator problem Null element");
    }
    //MESSAGE("vtkId " << vtkId << " smdsId " << smdsId << " " << elem->GetType());
    iter++;
    return elem;
  }
};

SMDS_ElemIteratorPtr SMDS_MeshNode::
GetInverseElementIterator(SMDSAbs_ElementType type) const
{
  vtkCellLinks::Link l = SMDS_Mesh::_meshList[myMeshId]->getGrid()->GetCellLinks()->GetLink(myVtkID);
  //MESSAGE("myID " << myID << " ncells " << l.ncells);
  return SMDS_ElemIteratorPtr(new SMDS_MeshNode_MyInvIterator(SMDS_Mesh::_meshList[myMeshId], l.cells, l.ncells, type));
}

// Same as GetInverseElementIterator but the create iterator only return
// wanted type elements.
class SMDS_MeshNode_MyIterator:public SMDS_ElemIterator
{
private:
  SMDS_Mesh* myMesh;
  vtkIdType* myCells;
  int  myNcells;
  SMDSAbs_ElementType                                 myType;
  int  iter;
  vector<SMDS_MeshElement*> myFiltCells;

public:
  SMDS_MeshNode_MyIterator(SMDS_Mesh *mesh,
                           vtkIdType* cells,
                           int ncells,
                           SMDSAbs_ElementType type):
    myMesh(mesh), myCells(cells), myNcells(ncells), myType(type), iter(0)
  {
    //MESSAGE("myNcells " << myNcells);
    for (; iter<ncells; iter++)
    {
      int vtkId = myCells[iter];
      int smdsId = myMesh->fromVtkToSmds(vtkId);
      //MESSAGE("vtkId " << vtkId << " smdsId " << smdsId);
      const SMDS_MeshElement* elem = myMesh->FindElement(smdsId);
      if (elem->GetType() == type)
        myFiltCells.push_back((SMDS_MeshElement*)elem);
    }
    myNcells = myFiltCells.size();
    //MESSAGE("myNcells " << myNcells);
    iter = 0;
    //MESSAGE("SMDS_MeshNode_MyIterator (filter) " << ncells << " " << myNcells);
  }

  bool more()
  {
    return (iter< myNcells);
  }

  const SMDS_MeshElement* next()
  {
    const SMDS_MeshElement* elem = myFiltCells[iter];
    iter++;
    return elem;
  }
};

SMDS_ElemIteratorPtr SMDS_MeshNode::
elementsIterator(SMDSAbs_ElementType type) const
{
  if(type==SMDSAbs_Node)
    return SMDS_MeshElement::elementsIterator(SMDSAbs_Node);
  else
  {
    vtkCellLinks::Link l = SMDS_Mesh::_meshList[myMeshId]->getGrid()->GetCellLinks()->GetLink(myVtkID);
    return SMDS_ElemIteratorPtr(new SMDS_MeshNode_MyIterator(SMDS_Mesh::_meshList[myMeshId], l.cells, l.ncells, type));
  }
}

int SMDS_MeshNode::NbNodes() const
{
  return 1;
}

double* SMDS_MeshNode::getCoord() const
{
#if 0
  double coord[3];
  double *coord2;
  vtkUnstructuredGrid *grid;
  coord2=(double *)malloc(3*sizeof(double));
  if ( SMDS_Mesh::_meshList[myMeshId] != NULL )
  {
	if ( SMDS_Mesh::_meshList[myMeshId]->getGrid() != NULL )
	{
	     grid = SMDS_Mesh::_meshList[myMeshId]->getGrid();
	     grid->GetPoints()->GetPoint(myVtkID,coord);
	     coord2[0]=coord[0];
	     coord2[1]=coord[1];
	     coord2[2]=coord[2];
	     return(coord2);
//	     return (double *)(SMDS_Mesh::_meshList[myMeshId]->getGrid()->GetPoints()->GetPoint(myVtkID,coord));
	}
  }
  else
  {
     coord2[0]=0.;
     coord2[1]=0.;
     coord2[2]=0.;
     return coord2;
  }
  return 0;
#else
  return SMDS_Mesh::_meshList[myMeshId]->getGrid()->GetPoint(myVtkID);
#endif
}

double SMDS_MeshNode::X() const
{
  double *coord = getCoord();
  return coord[0];
}

double SMDS_MeshNode::Y() const
{
  double *coord = getCoord();
  return coord[1];
}

double SMDS_MeshNode::Z() const
{
  double *coord = getCoord();
  return coord[2];
}

//================================================================================
/*!
 * \brief thread safe getting coords
 */
void SMDS_MeshNode::GetXYZ(double xyz[3]) const
{
  return SMDS_Mesh::_meshList[myMeshId]->getGrid()->GetPoint(myVtkID,xyz);
}

//* resize the vtkPoints structure every SMDS_Mesh::chunkSize points
void SMDS_MeshNode::setXYZ(double x, double y, double z)
{
  SMDS_Mesh *mesh = SMDS_Mesh::_meshList[myMeshId];
  vtkPoints *points = mesh->getGrid()->GetPoints();
  points->InsertPoint(myVtkID, x, y, z);
  mesh->adjustBoundingBox(x, y, z);
  mesh->setMyModified();
}

SMDSAbs_ElementType SMDS_MeshNode::GetType() const
{
  return SMDSAbs_Node;
}

vtkIdType SMDS_MeshNode::GetVtkType() const
{
  return VTK_VERTEX;
}

//=======================================================================
//function : AddInverseElement
//purpose  :
//=======================================================================
void SMDS_MeshNode::AddInverseElement(const SMDS_MeshElement* ME)
{
  const SMDS_MeshCell *cell = dynamic_cast<const SMDS_MeshCell*> (ME);
  assert(cell);
  SMDS_UnstructuredGrid* grid = SMDS_Mesh::_meshList[myMeshId]->getGrid();
  vtkCellLinks *Links = grid->GetCellLinks();
  Links->ResizeCellList(myVtkID, 1);
  Links->AddCellReference(cell->getVtkId(), myVtkID);
}

//=======================================================================
//function : ClearInverseElements
//purpose  :
//=======================================================================
void SMDS_MeshNode::ClearInverseElements()
{
  SMDS_Mesh::_meshList[myMeshId]->getGrid()->ResizeCellList(myVtkID, 0);
}

bool SMDS_MeshNode::emptyInverseElements()
{
  vtkCellLinks::Link l = SMDS_Mesh::_meshList[myMeshId]->getGrid()->GetCellLinks()->GetLink(myVtkID);
  return (l.ncells == 0);
}

//================================================================================
/*!
 * \brief Count inverse elements of given type
 */
//================================================================================

int SMDS_MeshNode::NbInverseElements(SMDSAbs_ElementType type) const
{
  vtkCellLinks::Link l = SMDS_Mesh::_meshList[myMeshId]->getGrid()->GetCellLinks()->GetLink(myVtkID);

  if ( type == SMDSAbs_All )
    return l.ncells;

  int nb = 0;
  SMDS_Mesh *mesh = SMDS_Mesh::_meshList[myMeshId];
  for (int i=0; i<l.ncells; i++)
  {
    const SMDS_MeshElement* elem = mesh->FindElement(mesh->fromVtkToSmds(l.cells[i]));
    if (elem->GetType() == type)
      nb++;
  }
  return nb;
}

///////////////////////////////////////////////////////////////////////////////
/// To be used with STL set
///////////////////////////////////////////////////////////////////////////////
bool operator<(const SMDS_MeshNode& e1, const SMDS_MeshNode& e2)
{
  return e1.getVtkId()<e2.getVtkId();
  /*if(e1.myX<e2.myX) return true;
    else if(e1.myX==e2.myX)
    {
    if(e1.myY<e2.myY) return true;
    else if(e1.myY==e2.myY) return (e1.myZ<e2.myZ);
    else return false;
    }
    else return false;*/
}

