/*=========================================================================
 *
 *  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 itkQuadEdgeMeshEulerOperatorDeleteCenterVertexFunction_h
#define itkQuadEdgeMeshEulerOperatorDeleteCenterVertexFunction_h

#include "itkQuadEdgeMeshFunctionBase.h"

namespace itk
{
/**
 * \class QuadEdgeMeshEulerOperatorDeleteCenterVertexFunction
 * \brief Delete the vertex, connected edges and faces and create a new face
 * in place of the previous vertex' one-ring.
 *
 * \ingroup QEMeshModifierFunctions
 * \ingroup ITKQuadEdgeMesh
 */
template <typename TMesh, typename TQEType>
class ITK_TEMPLATE_EXPORT QuadEdgeMeshEulerOperatorDeleteCenterVertexFunction
  : public QuadEdgeMeshFunctionBase<TMesh, TQEType *>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(QuadEdgeMeshEulerOperatorDeleteCenterVertexFunction);

  /** Standard class type aliases. */
  using Self = QuadEdgeMeshEulerOperatorDeleteCenterVertexFunction;
  using Superclass = QuadEdgeMeshFunctionBase<TMesh, TQEType *>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);
  /** \see LightObject::GetNameOfClass() */
  itkOverrideGetNameOfClassMacro(QuadEdgeMeshEulerOperatorDeleteCenterVertexFunction);

  /** Type of QuadEdge with which to apply slicing. */
  using QEType = TQEType;

  using typename Superclass::MeshType;
  using typename Superclass::OutputType;

  using PointIdentifier = typename MeshType::PointIdentifier;
  using FaceRefType = typename MeshType::FaceRefType;

  /** Evaluate at the specified input position */
  virtual OutputType
  Evaluate(QEType * g);

  PointIdentifier
  GetOldPointID()
  {
    return this->m_OldPointID;
  }

protected:
  QuadEdgeMeshEulerOperatorDeleteCenterVertexFunction()
    : m_OldPointID(0)
  {}
  ~QuadEdgeMeshEulerOperatorDeleteCenterVertexFunction() override = default;

private:
  PointIdentifier m_OldPointID{};
};
} // end namespace itk

#include "itkQuadEdgeMeshEulerOperatorDeleteCenterVertexFunction.hxx"

#endif
