/*=========================================================================
 *
 *  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 itkImageToImageMetricv4GetValueAndDerivativeThreader_hxx
#define itkImageToImageMetricv4GetValueAndDerivativeThreader_hxx

#include "itkImageRegionConstIteratorWithIndex.h"

namespace itk
{

template <typename TImageToImageMetricv4>
void
ImageToImageMetricv4GetValueAndDerivativeThreader<
  ThreadedImageRegionPartitioner<TImageToImageMetricv4::VirtualImageDimension>,
  TImageToImageMetricv4>::ThreadedExecution(const DomainType & imageSubRegion, const ThreadIdType threadId)
{
  typename VirtualImageType::ConstPointer virtualImage = this->m_Associate->GetVirtualImage();
  using IteratorType = ImageRegionConstIteratorWithIndex<VirtualImageType>;
  VirtualPointType virtualPoint;
  for (IteratorType it(virtualImage, imageSubRegion); !it.IsAtEnd(); ++it)
  {
    const VirtualIndexType & virtualIndex = it.GetIndex();
    virtualImage->TransformIndexToPhysicalPoint(virtualIndex, virtualPoint);
    this->ProcessVirtualPoint(virtualIndex, virtualPoint, threadId);
  }
  // Finalize per thread actions
  this->m_Associate->FinalizeThread(threadId);
}

template <typename TImageToImageMetricv4>
void
ImageToImageMetricv4GetValueAndDerivativeThreader<ThreadedIndexedContainerPartitioner, TImageToImageMetricv4>::
  ThreadedExecution(const DomainType & indexSubRange, const ThreadIdType threadId)
{
  typename TImageToImageMetricv4::VirtualPointSetType::ConstPointer virtualSampledPointSet =
    this->m_Associate->GetVirtualSampledPointSet();
  using ElementIdentifierType = typename TImageToImageMetricv4::VirtualPointSetType::MeshTraits::PointIdentifier;
  const ElementIdentifierType             begin = indexSubRange[0];
  const ElementIdentifierType             end = indexSubRange[1];
  typename VirtualImageType::ConstPointer virtualImage = this->m_Associate->GetVirtualImage();
  for (ElementIdentifierType i = begin; i <= end; ++i)
  {
    const VirtualPointType & virtualPoint = virtualSampledPointSet->GetPoint(i);
    const auto               virtualIndex = virtualImage->TransformPhysicalPointToIndex(virtualPoint);
    this->ProcessVirtualPoint(virtualIndex, virtualPoint, threadId);
  }
  // Finalize per thread actions
  this->m_Associate->FinalizeThread(threadId);
}

} // end namespace itk

#endif
