/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkBoostBrandesCentrality.cxx

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
/*-------------------------------------------------------------------------
  Copyright 2008 Sandia Corporation.
  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
  the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------*/
#include "vtkBoostBrandesCentrality.h"

#include "vtkCellArray.h"
#include "vtkCellData.h"
#include "vtkMath.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkFloatArray.h"
#include "vtkDataArray.h"
#include "vtkStringArray.h"

#include "vtkBoostGraphAdapter.h"
#include "vtkDirectedGraph.h"
#include "vtkUndirectedGraph.h"

#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/betweenness_centrality.hpp>
#include <boost/vector_property_map.hpp>

using namespace boost;

vtkCxxRevisionMacro(vtkBoostBrandesCentrality, "1.6");
vtkStandardNewMacro(vtkBoostBrandesCentrality);

// Constructor/Destructor
vtkBoostBrandesCentrality::vtkBoostBrandesCentrality()
{

}

vtkBoostBrandesCentrality::~vtkBoostBrandesCentrality()
{

}


int vtkBoostBrandesCentrality::RequestData(
  vtkInformation *vtkNotUsed(request),
  vtkInformationVector **inputVector,
  vtkInformationVector *outputVector)
{
  // get the info objects
  vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
  vtkInformation *outInfo = outputVector->GetInformationObject(0);

  // get the input and output
  vtkGraph *input = vtkGraph::SafeDownCast(
    inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkGraph *output = vtkGraph::SafeDownCast(
    outInfo->Get(vtkDataObject::DATA_OBJECT()));

  // Send the data to output.
  output->ShallowCopy(input);

  // Compute betweenness centrality
  
  // Property map for vertices
  vtkFloatArray* vertexCMap = vtkFloatArray::New();
  vertexCMap->SetName("centrality");
  identity_property_map imap;
  
  // Property map for edges   
  vtkFloatArray* edgeCMap = vtkFloatArray::New();
  edgeCMap->SetName("centrality");
  vtkGraphEdgePropertyMapHelper<vtkFloatArray*> helper(edgeCMap);


  
  // Is the graph directed or undirected
  if (vtkDirectedGraph::SafeDownCast(output))
    {
    vtkDirectedGraph *g = vtkDirectedGraph::SafeDownCast(output);
    brandes_betweenness_centrality(g,
           centrality_map(vertexCMap).edge_centrality_map(helper).vertex_index_map(imap));
    }
  else
    {
    vtkUndirectedGraph *g = vtkUndirectedGraph::SafeDownCast(output);
    brandes_betweenness_centrality(g,
           centrality_map(vertexCMap).edge_centrality_map(helper).vertex_index_map(imap));
    }
    
  // Add the arrays to the output and dereference  
  output->GetVertexData()->AddArray(vertexCMap);
  vertexCMap->Delete();
  output->GetEdgeData()->AddArray(edgeCMap);
  edgeCMap->Delete();

  return 1;
}

void vtkBoostBrandesCentrality::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os, indent);

}

