#ifndef __fpa__Image__EndPointsFilter__hxx__
#define __fpa__Image__EndPointsFilter__hxx__

#include <functional>
#include <map>
#include <queue>
#include <itkImageRegionConstIteratorWithIndex.h>

// -------------------------------------------------------------------------
template< class _TDistanceMap, class _TCostMap >
const typename fpa::Image::EndPointsFilter< _TDistanceMap, _TCostMap >::
TIndices& fpa::Image::EndPointsFilter< _TDistanceMap, _TCostMap >::
GetBifurcations( ) const
{
  return( this->m_Bifurcations );
}

// -------------------------------------------------------------------------
template< class _TDistanceMap, class _TCostMap >
const typename fpa::Image::EndPointsFilter< _TDistanceMap, _TCostMap >::
TIndices& fpa::Image::EndPointsFilter< _TDistanceMap, _TCostMap >::
GetEndPoints( ) const
{
  return( this->m_EndPoints );
}

// -------------------------------------------------------------------------
template< class _TDistanceMap, class _TCostMap >
void fpa::Image::EndPointsFilter< _TDistanceMap, _TCostMap >::
Compute( )
{
  typedef itk::ImageRegionConstIteratorWithIndex< _TDistanceMap > _TDistMapIt;
  typedef itk::ImageRegionConstIteratorWithIndex< _TCostMap > _TCostMapIt;
  typedef std::multimap< double, TIndex, std::greater< double > > _TQueue;
  typedef typename _TQueue::value_type _TQueueValue;

  // Some values
  typename _TDistanceMap::RegionType region =
    this->m_DistanceMap->GetRequestedRegion( );

  // Create queue
  _TQueue queue;
  _TDistMapIt dIt( this->m_DistanceMap, region );
  _TCostMapIt cIt( this->m_CostMap, region );
  dIt.GoToBegin( );
  cIt.GoToBegin( );
  for( ; !dIt.IsAtEnd( ) && !cIt.IsAtEnd( ); ++dIt, ++cIt )
  {
    double d = double( dIt.Get( ) );
    if( d > 0 )
    {
      double v = double( cIt.Get( ) ) / d;
      queue.insert( _TQueueValue( v, dIt.GetIndex( ) ) );

    } // fi

  } // rof

  // BFS from maximum queue
  TIndices marks;
  while( queue.size( ) > 0 )
  {
    // Get node
    auto nIt = queue.begin( );
    auto n = *nIt;
    queue.erase( nIt );
    if( marks.find( n.second ) != marks.end( ) )
      continue;

    // Mark it
    marks.insert( n.second );
    this->m_EndPoints.insert( n.second );

    // Get path
    typename TMST::TPath::Pointer path;
    this->m_MST->GetPath( path, n.second );
    for( unsigned long i = 0; i < path->GetSize( ); ++i )
    {
      typename TMST::TPath::TContinuousIndex cidx = path->GetVertex( i );
      typename _TCostMap::PointType cnt;
      this->m_CostMap->TransformContinuousIndexToPhysicalPoint( cidx, cnt );
      TIndex idx;
      this->m_CostMap->TransformPhysicalPointToIndex( cnt, idx );
      double d = double( this->m_DistanceMap->GetPixel( idx ) );

      /* TODO
         TIndex idx;
         for( unsigned int d = 0; d < _TCostMap::ImageDimension; ++d )
         idx[ d ] = cidx[ d ];
      */

    } // rof

    // TODO: temporary
    queue.clear( );

  } // elihw

  /* TODO
     while( queue.size( ) > 0 )
     {
     marks.insert( n.second );
     this->m_EndPoints.insert( n.second );
     auto path = this->m_MST->GetPath( n.second );
     std::cout << path.size( ) << std::endl;
     for( auto pIt = path.begin( ); pIt != path.end( ); ++pIt )
     {
     double d = double( this->m_DistanceMap->GetPixel( *pIt ) );
     d = std::sqrt( std::fabs( d ) );
     typename _TCostMap::PointType center;


     std::queue< TIndex > q;
     TIndices m;
     q.push( *pIt );
     while( q.size( ) > 0 )
     {
     TIndex idx = q.front( );
     q.pop( );
     if( m.find( idx ) != m.end( ) )
     continue;
     m.insert( idx );
     marks.insert( idx );
     for( unsigned int x = 0; x < _TCostMap::ImageDimension; ++x )
     {
     for( int y = -1; y <= 1; y += 2 )
     {
     TIndex idx2 = idx;
     idx2[ x ] += y;
     typename _TCostMap::PointType c;
     this->m_CostMap->TransformIndexToPhysicalPoint( idx2, c );
     if( this->m_CostMap->GetRequestedRegion( ).IsInside( idx2 ) )
     {
     if( center.EuclideanDistanceTo( c ) <= ( d * 1.5 ) )
     q.push( idx2 );

     } // fi

     } // rof

     } // rof

     } // elihw

     } // rof

     } // fi

     } // elihw
  */
}

// -------------------------------------------------------------------------
template< class _TDistanceMap, class _TCostMap >
fpa::Image::EndPointsFilter< _TDistanceMap, _TCostMap >::
EndPointsFilter( )
  : Superclass( )
{
}

// -------------------------------------------------------------------------
template< class _TDistanceMap, class _TCostMap >
fpa::Image::EndPointsFilter< _TDistanceMap, _TCostMap >::
~EndPointsFilter( )
{
}

#endif // __fpa__Image__EndPointsFilter__hxx__

// eof - $RCSfile$