#include "BaseFunctions.h"
#include <itkImage.h>
#include <fpa/Image/RandomWalker.h>
#include <fpa/Image/Functors/Dijkstra/Gaussian.h>

// -------------------------------------------------------------------------
const unsigned int Dim = 2;
typedef short         TPixel;
typedef unsigned char TLabel;
typedef float         TScalar;

typedef itk::Image< TPixel, Dim >                                    TInputImage;
typedef itk::Image< TLabel, Dim >                                    TLabelImage;
typedef fpa::Image::RandomWalker< TInputImage, TLabelImage, TScalar >    TFilter;
typedef fpa::Image::Functors::Dijkstra::Gaussian< TInputImage, TScalar > TWeight;

// -------------------------------------------------------------------------
int main( int argc, char* argv[] )
{
  // Get arguments
  if( argc < 7 )
  {
    std::cerr
      << "Usage: " << argv[ 0 ]
      << " input_image [labels_image] output_image output_costs"
      << " alpha beta visual_debug"
      << std::endl;
    return( 1 );

  } // fi
  int idx = ( argc == 7 )? 2: 3;
  std::string input_image_filename = argv[ 1 ];
  std::string labels_image_filename = ( argc == 8 )? argv[ 2 ]: "";
  std::string output_image_filename = argv[ idx ];
  std::string output_costs_filename = argv[ idx + 1 ];
  double alpha = std::atof( argv[ idx + 2 ] );
  double beta = std::atof( argv[ idx + 3 ] );
  bool visual_debug = ( argv[ idx + 4 ][ 0 ] == '1' );

  // Read image
  TInputImage::Pointer image;
  std::string err0 = fpa::tests::image::Read( image, input_image_filename );
  if( err0 != "" )
  {
    std::cerr << "Error caught: " << err0 << std::endl;
    return( 1 );

  } // fi

  // Read label
  TLabelImage::Pointer labels;
  if( labels_image_filename != "" )
  {
    std::string err1 = fpa::tests::image::Read( labels, labels_image_filename );
    if( err1 != "" )
    {
      std::cerr << "Error caught: " << err1 << std::endl;
      return( 1 );

    } // fi

  } // fi

  // Interact with image
  fpa::tests::image::Viewer< TFilter > viewer( image );
  if( visual_debug )
  {
    if( labels.IsNull( ) )
      viewer.ActivateBrushWidget( );
    viewer.Show( );

  } // fi

  // Prepare weight
  TWeight::Pointer weight = TWeight::New( );
  weight->SetAlpha( alpha );
  weight->SetBeta( beta );

  // Prepare filter
  TFilter::Pointer filter = TFilter::New( );
  filter->SetInput( image );
  filter->SetWeightFunction( weight );
  if( labels.IsNull( ) )
    viewer.AssociateLabelsTo( filter );
  else
    filter->SetLabels( labels );

  // Prepare visual debug and update
  if( visual_debug )
    viewer.ObserveFilter( filter );
  try
  {
    filter->Update( );
  }
  catch( std::exception& err )
  {
    std::cerr << "Error caught: " << err.what( ) << std::endl;
    return( 1 );

  } // yrt

  // Save results
  std::string err1 =
    fpa::tests::image::Write( filter->GetMarks( ), output_image_filename );
  std::string err2 =
    fpa::tests::image::Write( filter->GetOutput( ), output_costs_filename );
  if( err1 != "" ) std::cerr << "Error caught: " << err1 << std::endl;
  if( err2 != "" ) std::cerr << "Error caught: " << err2 << std::endl;

  return( 0 );
}

// eof - $RCSfile$