/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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
 *
 *         https://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.
 *
 *=========================================================================*/
#ifndef itkAttributeOpeningLabelMapFilter_hxx
#define itkAttributeOpeningLabelMapFilter_hxx

#include "itkProgressReporter.h"


namespace itk
{

template <typename TImage, typename TAttributeAccessor>
AttributeOpeningLabelMapFilter<TImage, TAttributeAccessor>::AttributeOpeningLabelMapFilter()
{
  m_Lambda = AttributeValueType{};
  m_ReverseOrdering = false;
  // create the output image for the removed objects
  this->SetNumberOfRequiredOutputs(2);
  this->SetNthOutput(1, static_cast<TImage *>(this->MakeOutput(1).GetPointer()));
}


template <typename TImage, typename TAttributeAccessor>
void
AttributeOpeningLabelMapFilter<TImage, TAttributeAccessor>::GenerateData()
{
  // Allocate the output
  this->AllocateOutputs();

  ImageType * output = this->GetOutput();
  ImageType * output2 = this->GetOutput(1);

  // set the background value for the second output - this is not done in the superclasses
  output2->SetBackgroundValue(output->GetBackgroundValue());

  AttributeAccessorType accessor;

  ProgressReporter progress(this, 0, output->GetNumberOfLabelObjects());

  typename ImageType::Iterator it(output);
  while (!it.IsAtEnd())
  {
    typename LabelObjectType::LabelType label = it.GetLabel();
    LabelObjectType *                   labelObject = it.GetLabelObject();

    if ((!m_ReverseOrdering && accessor(labelObject) < m_Lambda) ||
        (m_ReverseOrdering && accessor(labelObject) > m_Lambda))
    {
      // must increment the iterator before removing the object to avoid invalidating the iterator
      ++it;
      output2->AddLabelObject(labelObject);
      output->RemoveLabel(label);
    }
    else
    {
      ++it;
    }

    progress.CompletedPixel();
  }
}


template <typename TImage, typename TAttributeAccessor>
void
AttributeOpeningLabelMapFilter<TImage, TAttributeAccessor>::PrintSelf(std::ostream & os, Indent indent) const
{
  Superclass::PrintSelf(os, indent);

  os << indent << "ReverseOrdering: " << m_ReverseOrdering << std::endl;
  os << indent << "Lambda: " << static_cast<typename NumericTraits<AttributeValueType>::PrintType>(m_Lambda)
     << std::endl;
}

} // end namespace itk
#endif
