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

#include <itkImage.h>
#include <itkImageFileReader.h>
#include <itkImageFileWriter.h>
#include <fpa/Filters/Image/RegionGrow.h>
#include <fpa/Functors/RegionGrow/BinaryThreshold.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 < 6 )
  {
    std::cerr
      << "Usage: " << argv[ 0 ]
      << " input_image output_image output_marks lower upper [seeds]"
      << std::endl;
    return( 1 );

  } // fi
  std::string input_image_filename = argv[ 1 ];
  std::string output_image_filename = argv[ 2 ];
  std::string output_marks_filename = argv[ 3 ];
  TPixel lower = TPixel( std::atof( argv[ 4 ] ) );
  TPixel upper = TPixel( std::atof( argv[ 5 ] ) );

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

  // Prepare predicate
  typedef fpa::Functors::RegionGrow::BinaryThreshold< TPixel > TPredicate;
  TPredicate::Pointer predicate = TPredicate::New( );
  predicate->SetLowerThreshold( lower );
  predicate->SetUpperThreshold( upper );

  // Prepare filter
  typedef fpa::Filters::Image::RegionGrow< TImage, TImage > TFilter;
  TFilter::Pointer filter = TFilter::New( );
  filter->SetInput( input_image_reader->GetOutput( ) );
  filter->SetPredicate( predicate );
  filter->SetInsideValue( std::numeric_limits< TPixel >::max( ) );
  filter->SetOutsideValue( TPixel( 0 ) );

  // Get all seeds
  for( int i = 6; i < argc; i += Dim )
  {
    TImage::IndexType seed;
    for( int j = 0; j < Dim; ++j )
      if( i + j < argc )
        seed[ j ] = std::atoi( argv[ i + j ] );
    filter->AddSeed( seed );

  } // rof

  // Execute filter
  filter->Update( );

  // Save results
  typedef itk::ImageFileWriter< TFilter::TOutputImage > TOutputWriter;
  TOutputWriter::Pointer output_writer = TOutputWriter::New( );
  output_writer->SetInput( filter->GetOutput( ) );
  output_writer->SetFileName( output_image_filename );

  typedef itk::ImageFileWriter< TFilter::TMarksImage > TMarksWriter;
  TMarksWriter::Pointer marks_writer = TMarksWriter::New( );
  marks_writer->SetInput( filter->GetMarks( ) );
  marks_writer->SetFileName( output_marks_filename );

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

  } // yrt

  return( 0 );
}

// eof - $RCSfile$