// =========================================================================
// @author Leonardo Florez Valencia
// @email florez-l@javeriana.edu.co
// =========================================================================

#include <itkImage.h>
#include <itkImageFileReader.h>
#include <fpa/Common/Image/SkeletonWriter.h>
#include <fpa/Filters/Image/ExtractSkeleton.h>

// -------------------------------------------------------------------------
const unsigned int Dim = 2;
typedef unsigned char TPixel;
typedef itk::Image< TPixel, Dim > TImage;

// -------------------------------------------------------------------------
int main( int argc, char* argv[] )
{
  // Get arguments
  if( argc < 3 )
  {
    std::cerr
      << "Usage: " << argv[ 0 ]
      << " input_image output_skeleton [seed]"
      << std::endl;
    return( 1 );

  } // fi
  std::string input_image_filename = argv[ 1 ];
  std::string output_skeleton_filename = argv[ 2 ];

  // Read image
  typedef itk::ImageFileReader< TImage > TImageReader;
  TImageReader::Pointer input_image_reader = TImageReader::New( );
  input_image_reader->SetFileName( input_image_filename );

  // Prepare filter
  typedef fpa::Filters::Image::ExtractSkeleton< TImage > TFilter;
  TFilter::Pointer filter = TFilter::New( );
  filter->SetInput( input_image_reader->GetOutput( ) );

  // Get seed
  if( argc >= Dim + 3 )
  {
    TImage::IndexType seed;
    for( int j = 0; j < Dim; ++j )
      if( 3 + j < argc )
        seed[ j ] = std::atoi( argv[ 3 + j ] );
    filter->SeedFromMaximumDistanceOff( );
    filter->SetSeed( seed );
  }
  else
    filter->SeedFromMaximumDistanceOn( );

  // Configure distance map
  filter->GetDistanceMap( )->InsideIsPositiveOn( );
  filter->GetDistanceMap( )->SquaredDistanceOff( );
  filter->GetDistanceMap( )->UseImageSpacingOn( );

  // Execute filter
  filter->Update( );

  // Save results
  typedef fpa::Common::Image::SkeletonWriter< TFilter::TSkeleton > TSkeletonWriter;
  TSkeletonWriter::Pointer skeleton_writer = TSkeletonWriter::New( );
  skeleton_writer->SetInput( filter->GetOutput( ) );
  skeleton_writer->SetFileName( output_skeleton_filename );

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

  } // yrt
  return( 0 );
}

// eof - $RCSfile$