/*=========================================================================
 *
 *  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 itkAttributeSelectionLabelMapFilter_h
#define itkAttributeSelectionLabelMapFilter_h

#include "itkInPlaceLabelMapFilter.h"
#include "itkAttributeLabelObject.h"
#include <set>


namespace itk
{
/**
 * \class AttributeSelectionLabelMapFilter
 * \brief Remove the objects according to the value of their attribute.
 *
 * AttributeSelectionLabelMapFilter removes the objects in a label collection image
 * with an attribute value inside or outside a set of attribute values passed by
 * the user.
 * The attribute is provided by an attribute accessor given in template parameter.
 * Contrary to the other filters made to remove some object of a LabelMap, no
 * ordering relation for the attribute is needed in that filter.
 * The filter provides two outputs: the first contains the surviving objects,
 * the second the removed objects (the input LabelMap is the union of these two LabelMaps).
 *
 * \author Gaetan Lehmann. Biologie du Developpement et de la Reproduction, INRA de Jouy-en-Josas, France.
 *
 * This implementation was taken from the Insight Journal paper:
 * https://doi.org/10.54294/q6auw4
 *
 * \sa AttributeLabelObject
 * \ingroup ImageEnhancement  MathematicalMorphologyImageFilters
 * \ingroup ITKLabelMap
 */
template <typename TImage,
          typename TAttributeAccessor = Functor::AttributeLabelObjectAccessor<typename TImage::LabelObjectType>>
class ITK_TEMPLATE_EXPORT AttributeSelectionLabelMapFilter : public InPlaceLabelMapFilter<TImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(AttributeSelectionLabelMapFilter);

  /** Standard class type aliases. */
  using Self = AttributeSelectionLabelMapFilter;
  using Superclass = InPlaceLabelMapFilter<TImage>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  /** Some convenient type alias. */
  using ImageType = TImage;
  using ImagePointer = typename ImageType::Pointer;
  using ImageConstPointer = typename ImageType::ConstPointer;
  using PixelType = typename ImageType::PixelType;
  using IndexType = typename ImageType::IndexType;
  using LabelObjectType = typename ImageType::LabelObjectType;

  using AttributeAccessorType = TAttributeAccessor;
  using AttributeValueType = typename AttributeAccessorType::AttributeValueType;

  using AttributeSetType = std::set<AttributeValueType>;

  /** ImageDimension constants */
  static constexpr unsigned int ImageDimension = TImage::ImageDimension;

  /** Standard New method. */
  itkNewMacro(Self);

  /** \see LightObject::GetNameOfClass() */
  itkOverrideGetNameOfClassMacro(AttributeSelectionLabelMapFilter);

  /*  itkConceptMacro(InputEqualityComparableCheck,
      (Concept::EqualityComparable<InputImagePixelType>));
    itkConceptMacro(IntConvertibleToInputCheck,
      (Concept::Convertible<int, InputImagePixelType>));
    itkConceptMacro(InputOStreamWritableCheck,
      (Concept::OStreamWritable<InputImagePixelType>));*/

  /**
   * Set/Get the threshold used to keep or remove the objects.
   */
  /** @ITKStartGrouping */
  const AttributeSetType &
  GetAttributeSet() const
  {
    return m_AttributeSet;
  }
  void
  SetAttributeSet(const AttributeSetType & set)
  {
    m_AttributeSet = set;
    this->Modified();
  }
  /** @ITKEndGrouping */

  /**
   * Set/Get whether the objects with the specified attribute values should be kept
   * or excluded.
   */
  /** @ITKStartGrouping */
  itkGetConstMacro(Exclude, bool);
  itkSetMacro(Exclude, bool);
  itkBooleanMacro(Exclude);
  /** @ITKEndGrouping */

  /** Clear the attribute set, and add the attribute passed in parameter */
  void
  SetAttribute(const AttributeValueType & attr)
  {
    this->ClearAttributeSet();
    this->AddAttribute(attr);
  }

  void
  ClearAttributeSet()
  {
    if (!m_AttributeSet.empty())
    {
      m_AttributeSet.clear();
      this->Modified();
    }
  }

  void
  AddAttribute(const AttributeValueType & attr)
  {
    const typename AttributeSetType::size_type size = m_AttributeSet.size();
    m_AttributeSet.insert(attr);
    if (size != m_AttributeSet.size())
    {
      this->Modified();
    }
  }

protected:
  AttributeSelectionLabelMapFilter();
  ~AttributeSelectionLabelMapFilter() override = default;

  void
  GenerateData() override;

  void
  PrintSelf(std::ostream & os, Indent indent) const override;

private:
  AttributeSetType m_AttributeSet{};
  bool             m_Exclude{};

}; // end of class

} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkAttributeSelectionLabelMapFilter.hxx"
#endif

#endif
