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

#include <string>
#include <tclap/CmdLine.h>
#include <itkImage.h>
#include <fpa/Filters/Image/RandomWalker.h>
#include <fpa/Functors/Dijkstra/Image/Gaussian.h>
#include "Functions.h"

// -------------------------------------------------------------------------
const unsigned int Dim = 3;
typedef short                                  TPixel;
typedef unsigned char                          TLabel;
typedef itk::NumericTraits< TPixel >::RealType TScalar;
typedef itk::Image< TPixel, Dim >              TImage;
typedef itk::Image< TLabel, Dim >              TLabels;

// -------------------------------------------------------------------------
int main( int argc, char* argv[] )
{
  typedef TCLAP::ValueArg< std::string > _TStringArg;
  typedef TCLAP::ValueArg< TScalar > _TRealArg;

  // Parse input line
  _TStringArg in( "i", "input", "Input image", true, "", "file" );
  _TStringArg labels( "l", "labels", "Input labels", true, "", "file" );
  _TStringArg out( "o", "output", "Output image", true, "", "file" );
  _TRealArg beta( "b", "beta", "Beta", false, 2.5, "value (2.5)" );
  _TRealArg eps( "e", "epsilon", "Epsilon", false, 1e-5, "value (1e-5)" );
  try
  {
    TCLAP::CmdLine cmd( "FastRandomWalker", ' ', "1.0.0" );
    cmd.add( eps );
    cmd.add( beta );
    cmd.add( out );
    cmd.add( labels );
    cmd.add( in );
    cmd.parse( argc, argv );
  }
  catch( TCLAP::ArgException& err )
  {
    std::cerr
      << "===============================" << std::endl
      << "Error caught: " << std::endl
      << err.error( ) << " " << err.argId( ) << std::endl
      << "===============================" << std::endl
      << std::endl;
    return( 1 );

  } // yrt

  try
  {
    // Read input image
    TImage::Pointer input_image;
    CTBronchi::ReadImage( input_image, in.getValue( ) );

    // Read input labels
    TLabels::Pointer input_labels;
    CTBronchi::ReadImage( input_labels, labels.getValue( ) );

    // Prepare weight functor
    typedef fpa::Functors::Dijkstra::Image::Gaussian< TImage, TScalar > TWeight;
    TWeight::Pointer weight = TWeight::New( );
    weight->SetBeta( beta.getValue( ) );
    weight->SetEpsilon( eps.getValue( ) );

    // Random walk
    typedef fpa::Filters::Image::RandomWalker< TImage, TLabels, TScalar > TFilter;
    TFilter::Pointer filter = TFilter::New( );
    filter->SetInputImage( input_image );
    filter->SetInputLabels( input_labels );
    filter->SetWeightFunction( weight );
    double t = CTBronchi::MeasureTime( filter );
    std::cout << "FastRandomWalk executed in " << t << " s" << std::endl;

    // Write result
    CTBronchi::WriteImage( filter->GetOutputLabels( ), out.getValue( ) );
  }
  catch( std::exception& err )
  {
    std::cerr
      << "===============================" << std::endl
      << "Error caught: " << std::endl
      << err.what( ) << std::endl
      << "===============================" << std::endl
      << std::endl;
    return( 1 );

  } // yrt
  return( 0 );
}

// eof - $RCSfile$