/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/

#include "itkLaplacianSegmentationLevelSetImageFilter.h"


namespace LSIFTN {

typedef itk::Image<float, 3> ImageType;
typedef itk::Image<char, 3>  SeedImageType;

const int V_WIDTH  = 64;
const int V_HEIGHT = 64;
const int V_DEPTH  = 64;

float sphere(float x, float y, float z)
{
    float dis;
    dis = (x - (float)V_WIDTH/2.0)*(x - (float)V_WIDTH/2.0)
      /((0.2f*V_WIDTH)*(0.2f*V_WIDTH)) +
      (y - (float)V_HEIGHT/2.0)*(y - (float)V_HEIGHT/2.0)
      /((0.2f*V_HEIGHT)*(0.2f*V_HEIGHT)) +
      (z - (float)V_DEPTH/2.0)*(z - (float)V_DEPTH/2.0)
      /((0.2f*V_DEPTH)*(0.2f*V_DEPTH));
    return(1.0f-dis);
}

float sphere2(float x, float y, float z)
{
    float dis;
    dis = (x - (float)V_WIDTH/2.1)*(x - (float)V_WIDTH/2.1)
      /((0.2f*V_WIDTH)*(0.2f*V_WIDTH)) +
      (y - (float)V_HEIGHT/2.0)*(y - (float)V_HEIGHT/2.0)
      /((0.2f*V_HEIGHT)*(0.2f*V_HEIGHT)) +
      (z - (float)V_DEPTH/2.0)*(z - (float)V_DEPTH/2.0)
      /((0.2f*V_DEPTH)*(0.2f*V_DEPTH));
    return(1.0f-dis);
}

void evaluate_float_function(itk::Image<float, 3> *im,
          float (*f)(float, float, float) )
{
  itk::Image<float, 3>::IndexType idx;

  for(int z = 0; z < V_DEPTH; ++z)
    {
      idx[2] = z;
      for (int y = 0; y < V_HEIGHT; ++y)
        {
          idx[1] = y;
          for (int x = 0; x < V_WIDTH; ++x)
            {
              idx[0] = x;
              float val = f((float)x,(float)y,(float)z);
              //im->SetPixel(idx, -1.0 * f((float)x,(float)y,(float)z));
              if ( val >= 0.0 )
                {  im->SetPixel(idx, (64 - val)); }
              else
                {  im->SetPixel(idx, 64 + val ); }
            }
        }
    }
}

void evaluate_function(itk::Image<char, 3> *im,
          float (*f)(float, float, float) )
{
  itk::Image<char, 3>::IndexType idx;

  for(int z = 0; z < V_DEPTH; ++z)
    {
      idx[2] = z;
      for (int y = 0; y < V_HEIGHT; ++y)
        {
          idx[1] = y;
          for (int x = 0; x < V_WIDTH; ++x)
            {
              idx[0] = x;
              if ( f((float)x,(float)y,(float)z) >= 0.0 )
                {  im->SetPixel(idx, 1 ); }
              else
                {  im->SetPixel(idx, 0 ); }
            }
        }
    }
}

} // end namespace


namespace itk {

class RMSCommand : public Command
{
public:
  /** Smart pointer declaration methods */
  typedef RMSCommand                    Self;
  typedef Command                       Superclass;
  typedef itk::SmartPointer<Self>       Pointer;
  typedef itk::SmartPointer<const Self> ConstPointer;
  itkTypeMacro( RMSCommand, Command );
  itkNewMacro(Self);

  /** Standard Command virtual methods */
  virtual void Execute(Object *caller, const EventObject &) ITK_OVERRIDE
  {
    std::cout <<
      (dynamic_cast<SparseFieldLevelSetImageFilter< ::LSIFTN::SeedImageType, ::LSIFTN::ImageType> *>(caller))->GetRMSChange()
              << std::endl;
    std::cout <<
      (dynamic_cast<SegmentationLevelSetImageFilter< ::LSIFTN::SeedImageType, ::LSIFTN::ImageType> *>(caller))->GetSegmentationFunction()->GetPropagationWeight()
              << std::endl;

  }
  virtual void Execute(const Object *, const EventObject &) ITK_OVERRIDE
  {
    std::cout << "ack" << std::endl;

  }

protected:
  RMSCommand()  {}
  virtual ~RMSCommand() ITK_OVERRIDE {}
};

}


int itkLaplacianSegmentationLevelSetImageFilterTest(int, char * [] )
{
  std::cout << "Last modified 11/08/02" << std::endl;

  LSIFTN::ImageType::RegionType reg;
  LSIFTN::ImageType::RegionType::SizeType sz;
  LSIFTN::ImageType::RegionType::IndexType idx;
  idx[0] = idx[1] = idx[2] = 0;
  sz[0] = sz[1] = sz[2] = 64;
  reg.SetSize(sz);
  reg.SetIndex(idx);

  LSIFTN::ImageType::Pointer     inputImage = LSIFTN::ImageType::New();
  LSIFTN::SeedImageType::Pointer seedImage = LSIFTN::SeedImageType::New();
  inputImage->SetRegions(reg);
  seedImage->SetRegions(reg);
  inputImage->Allocate();
  seedImage->Allocate();

  // Starting surface is a sphere in the center of the image.
  LSIFTN::evaluate_function(seedImage, LSIFTN::sphere);

  // Target surface is a sphere VERY NEAR to the starting surface.  The
  // laplacian segmentation is not a region growing type segmenation, but is
  // better for refinement of existing approximate segmentations.

  LSIFTN::evaluate_float_function(inputImage, LSIFTN::sphere2);


  itk::LaplacianSegmentationLevelSetImageFilter< ::LSIFTN::SeedImageType, ::LSIFTN::ImageType>::Pointer
    filter = itk::LaplacianSegmentationLevelSetImageFilter< ::LSIFTN::SeedImageType, ::LSIFTN::ImageType>::New();
  filter->SetInput(seedImage);
  filter->SetFeatureImage(inputImage);

  filter->SetMaximumRMSError(0.02);
  filter->SetNumberOfIterations(10);
  //    filter->SetUseNegativeFeaturesOn(); // Change the default behavior of the speed
                                      // function so that negative values result in
                                      // surface growth.

  itk::RMSCommand::Pointer c = itk::RMSCommand::New();
  filter->AddObserver(itk::IterationEvent(), c);
  filter->SetIsoSurfaceValue(0.5);  //<--- IMPORTANT!  Default is zero.
  filter->SetFeatureScaling(100.0);

  try {
    filter->Update();
    std::cout << "Done first trial" << std::endl;
    // Repeat to make sure that the filter is reinitialized properly
        filter->SetNumberOfIterations(5);
        filter->Update();
        std::cout << "Done second trial" << std::endl;

    // Write the output for debugging purposes
    //        itk::ImageFileWriter<LSIFTN::ImageType>::Pointer writer
    //          = itk::ImageFileWriter<LSIFTN::ImageType>::New();
    //        itk::RawImageIO<float, 3>::Pointer io = itk::RawImageIO<float, 3>::New();
    //        io->SetFileTypeToBinary();
    //        io->SetFileDimensionality(3);
    //        io->SetByteOrderToLittleEndian();
    //        writer->SetImageIO(io);

    //        itk::CastImageFilter<LSIFTN::SeedImageType, LSIFTN::ImageType>::Pointer
    //         caster = itk::CastImageFilter<LSIFTN::SeedImageType, LSIFTN::ImageType>::New();
    //        caster->SetInput(seedImage);
    //        caster->Update();

        // writer->SetInput(caster->GetOutput());
        // writer->SetInput(filter->GetSpeedImage());
        //    writer->SetInput(filter->GetFeatureImage());
        //     writer->SetInput(inputImage);
        //    writer->SetInput(filter->GetOutput());
        //        writer->SetFileName("featureimage.raw");
        //        writer->Write();

        //        writer->SetInput(caster->GetOutput());
        //        writer->SetFileName("seedimage.raw");
        //        writer->Write();

        //        writer->SetInput(filter->GetOutput());
        //        writer->SetFileName("outputimage.raw");
        //        writer->Write();

        //        writer->SetInput(filter->GetSpeedImage());
        //        writer->SetFileName("speedimage.raw");
        //        writer->Write();


  }
  catch (itk::ExceptionObject &e)
    {
      std::cerr << e << std::endl;
    }

  return EXIT_SUCCESS;
}