/*=========================================================================
 *
 *  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.
 *
 *=========================================================================*/
#ifndef itkDiscreteMinimumCurvatureQuadEdgeMeshFilter_h
#define itkDiscreteMinimumCurvatureQuadEdgeMeshFilter_h

#include "itkDiscretePrincipalCurvaturesQuadEdgeMeshFilter.h"

namespace itk
{
/**
 * \class DiscreteMinimumCurvatureQuadEdgeMeshFilter
 *
 * \brief FIXME    add documentation here
 *
 * \ingroup ITKQuadEdgeMeshFiltering
 */
template< typename TInputMesh, typename TOutputMesh=TInputMesh >
class DiscreteMinimumCurvatureQuadEdgeMeshFilter:
  public DiscretePrincipalCurvaturesQuadEdgeMeshFilter< TInputMesh, TOutputMesh >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(DiscreteMinimumCurvatureQuadEdgeMeshFilter);

  using Self = DiscreteMinimumCurvatureQuadEdgeMeshFilter;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;
  using Superclass = DiscretePrincipalCurvaturesQuadEdgeMeshFilter<
    TInputMesh, TOutputMesh >;

  using InputMeshType = typename Superclass::InputMeshType;
  using InputMeshPointer = typename Superclass::InputMeshPointer;

  using OutputMeshType = typename Superclass::OutputMeshType;
  using OutputMeshPointer = typename Superclass::OutputMeshPointer;
  using OutputPointsContainerPointer = typename Superclass::OutputPointsContainerPointer;
  using OutputPointsContainerIterator = typename Superclass::OutputPointsContainerIterator;
  using OutputPointType = typename Superclass::OutputPointType;
  using OutputVectorType = typename Superclass::OutputVectorType;
  using OutputCoordType = typename Superclass::OutputCoordType;
  using OutputPointIdentifier = typename Superclass::OutputPointIdentifier;
  using OutputCellIdentifier = typename Superclass::OutputCellIdentifier;
  using OutputQEType = typename Superclass::OutputQEType;
  using OutputMeshTraits = typename Superclass::OutputMeshTraits;
  using OutputCurvatureType = typename Superclass::OutputCurvatureType;

  using TriangleType = typename Superclass::TriangleType;

  /** Run-time type information (and related methods).   */
  itkTypeMacro(DiscreteMinimumCurvatureQuadEdgeMeshFilter, DiscretePrincipalCurvaturesQuadEdgeMeshFilter);

  /** New macro for creation of through a Smart Pointer   */
  itkNewMacro(Self);

#ifdef ITK_USE_CONCEPT_CHECKING
  // Begin concept checking
  itkConceptMacro( OutputIsFloatingPointCheck,
                   ( Concept::IsFloatingPoint< OutputCurvatureType > ) );
  // End concept checking
#endif

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

  OutputCurvatureType EstimateCurvature(const OutputPointType & iP) override
  {
    this->ComputeMeanAndGaussianCurvatures(iP);
    return this->m_Mean - std::sqrt( this->ComputeDelta() );
  }
};
}

#endif
