/*=========================================================================
 *
 *  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 itkAnchorOpenCloseLine_h
#define itkAnchorOpenCloseLine_h

#include "itkMorphologyHistogram.h"
#include "itkIndent.h"

// #define RAWHIST

namespace itk
{
/**
 * \class AnchorOpenCloseLine
 * \brief class to implement openings and closings using anchor
 * methods. This is the base class that must be instantiated with
 * appropriate definitions of greater, less and so on
 * \ingroup ITKMathematicalMorphology
 */
template <typename TInputPix, typename TCompare>
class ITK_TEMPLATE_EXPORT AnchorOpenCloseLine
{
public:
  /** Some convenient type alias. */
  /** @ITKStartGrouping */
  using InputImagePixelType = TInputPix;
  AnchorOpenCloseLine() = default;
  ~AnchorOpenCloseLine() = default;
  /** @ITKEndGrouping */
  void
  PrintSelf(std::ostream & os, Indent indent) const;

  /** Single-threaded version of GenerateData.  This filter delegates
   * to GrayscaleGeodesicErodeImageFilter. */
  void
  DoLine(std::vector<InputImagePixelType> & buffer, unsigned int bufflength);

  void
  SetSize(unsigned int size)
  {
    m_Size = size;
  }

private:
  unsigned int m_Size{ 2 };

  using HistogramType = Function::MorphologyHistogram<InputImagePixelType, TCompare>;

  bool
  StartLine(std::vector<InputImagePixelType> & buffer,
            InputImagePixelType &              Extreme,
            unsigned int &                     outLeftP,
            unsigned int &                     outRightP);

  void
  FinishLine(std::vector<InputImagePixelType> & buffer,
             InputImagePixelType &              Extreme,
             unsigned int &                     outLeftP,
             unsigned int &                     outRightP);

  inline bool
  Compare1(const InputImagePixelType & a, const InputImagePixelType & b)
  {
    TCompare compare;
    return !compare(a, b);
  }

  inline bool
  Compare2(const InputImagePixelType & a, const InputImagePixelType & b)
  {
    TCompare compare;
    return compare(a, b) || a == b;
  }

}; // end of class
} // end namespace itk

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

#endif
