#include <itkImage.h>
#include <itkImageFileReader.h>
#include <itkImageFileWriter.h>

#include <fpa/Image/Dijkstra.h>
#include <fpa/Image/Functors/GaussianWeight.h>

// -------------------------------------------------------------------------
static const unsigned int VDim = 2;
typedef double                                                 TPixel;
typedef itk::Image< TPixel, VDim >                             TImage;
typedef itk::ImageFileReader< TImage >                         TReader;
typedef itk::ImageFileWriter< TImage >                         TWriter;
typedef fpa::Image::Dijkstra< TImage, TImage >                 TFilter;
typedef fpa::Image::Functors::GaussianWeight< TImage, TPixel > TVertexFunc;

// -------------------------------------------------------------------------
int main( int argc, char* argv[] )
{
  // Get arguments
  if( argc < 5 + VDim )
  {
    std::cerr
      << "Usage: " << argv[ 0 ]
      << " input_image output_image stop_at_one_front beta";
    for( unsigned int i = 0; i < VDim; ++i )
      std::cerr << " s_" << i;
    std::cerr << " ..." << std::endl;
    return( 1 );

  } // fi
  std::string input_image_filename = argv[ 1 ];
  std::string output_image_filename = argv[ 2 ];
  bool stop_at_one_front = ( std::atoi( argv[ 3 ] ) == 1 );
  double beta = std::atof( argv[ 4 ] );

  TReader::Pointer reader = TReader::New( );
  reader->SetFileName( input_image_filename );

  TFilter::Pointer filter = TFilter::New( );
  filter->SetInput( reader->GetOutput( ) );
  filter->SetStopAtOneFront( stop_at_one_front );

  for( int i = 5; i < argc; i += VDim )
  {
    if( i + VDim <= argc )
    {
      TImage::IndexType seed;
      for( int j = 0; j < VDim; ++j )
        seed[ j ] = std::atoi( argv[ i + j ] );
      filter->AddSeed( seed );

    } // fi

  } // rof

  TVertexFunc::Pointer vertex_func = TVertexFunc::New( );
  vertex_func->SetBeta( beta );
  vertex_func->InvertOn( );
  filter->SetFunctor( vertex_func );

  TWriter::Pointer writer = TWriter::New( );
  writer->SetInput( filter->GetOutput( ) );
  writer->SetFileName( output_image_filename );

  try
  {
    writer->Update( );
  }
  catch( std::exception& err )
  {
    std::cerr << "ERROR: " << err.what( ) << std::endl;
    return( 1 );

  } // yrt
  return( 0 );
}

// eof - $RCSfile$