/*=========================================================================
 *
 *  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 itkLevelSetDomainPartitionImageWithKdTree_hxx
#define itkLevelSetDomainPartitionImageWithKdTree_hxx


namespace itk
{
template <typename TImage>
LevelSetDomainPartitionImageWithKdTree<TImage>::LevelSetDomainPartitionImageWithKdTree()
  : m_KdTree(nullptr)
{}

template <typename TImage>
void
LevelSetDomainPartitionImageWithKdTree<TImage>::PopulateListDomain()
{
  if (this->m_KdTree.IsNotNull())
  {
    this->PopulateDomainWithKdTree();
  }
  else
  {
    Superclass::PopulateListDomain();
  }
}

template <typename TImage>
void
LevelSetDomainPartitionImageWithKdTree<TImage>::PopulateDomainWithKdTree()
{
  Superclass::AllocateListDomain();

  const ListRegionType region = this->m_ListDomain->GetLargestPossibleRegion();

  for (ListIteratorType lIt(this->m_ListDomain, region); !lIt.IsAtEnd(); ++lIt)
  {
    const ListIndexType & index = lIt.GetIndex();
    ListPointType         pt;

    this->m_ListDomain->TransformIndexToPhysicalPoint(index, pt);

    CentroidVectorType queryPoint = pt.GetVectorFromOrigin();

    typename TreeType::InstanceIdentifierVectorType neighbors;
    this->m_KdTree->Search(queryPoint, this->m_NumberOfNeighbors, neighbors);

    IdentifierListType identifierList;
    for (NeighborsIdType i = 0; i < this->m_NumberOfNeighbors; ++i)
    {
      IdentifierType levelSetID = neighbors[i];
      if (this->m_LevelSetDomainRegionVector[levelSetID].IsInside(index))
      {
        identifierList.push_back(neighbors[i]);
      }
    }
    lIt.Set(identifierList);
  }
}

} // end namespace itk
#endif
