/*=========================================================================
 *
 *  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 itkTransformMeshFilter_hxx
#define itkTransformMeshFilter_hxx

#include "itkMacro.h"

namespace itk
{
/**
 *
 */
template <typename TInputMesh, typename TOutputMesh, typename TTransform>
TransformMeshFilter<TInputMesh, TOutputMesh, TTransform>::TransformMeshFilter()
  : m_Transform(nullptr) // has to be provided by the user.
{}

/**
 *
 */
template <typename TInputMesh, typename TOutputMesh, typename TTransform>
void
TransformMeshFilter<TInputMesh, TOutputMesh, TTransform>::PrintSelf(std::ostream & os, Indent indent) const
{
  Superclass::PrintSelf(os, indent);
  if (m_Transform)
  {
    os << indent << "Transform: " << m_Transform << std::endl;
  }
}

/**
 * This method causes the filter to generate its output.
 */
template <typename TInputMesh, typename TOutputMesh, typename TTransform>
void
TransformMeshFilter<TInputMesh, TOutputMesh, TTransform>::GenerateData()
{
  using InputPointsContainer = typename TInputMesh::PointsContainer;
  using OutputPointsContainer = typename TOutputMesh::PointsContainer;

  using InputPointsContainerConstPointer = typename TInputMesh::PointsContainerConstPointer;
  using OutputPointsContainerPointer = typename TOutputMesh::PointsContainerPointer;

  const InputMeshType *   inputMesh = this->GetInput();
  const OutputMeshPointer outputMesh = this->GetOutput();

  if (!inputMesh)
  {
    itkExceptionStringMacro("Missing Input Mesh");
  }

  if (!outputMesh)
  {
    itkExceptionStringMacro("Missing Output Mesh");
  }

  if (!m_Transform)
  {
    itkExceptionStringMacro("Missing Input Transform");
  }

  outputMesh->SetBufferedRegion(outputMesh->GetRequestedRegion());

  const InputPointsContainerConstPointer inPoints = inputMesh->GetPoints();
  const OutputPointsContainerPointer     outPoints = outputMesh->GetPoints();

  outPoints->Reserve(inputMesh->GetNumberOfPoints());
  outPoints->Squeeze(); // in case the previous mesh had
                        // allocated a larger memory

  typename InputPointsContainer::ConstIterator inputPoint = inPoints->Begin();
  typename OutputPointsContainer::Iterator     outputPoint = outPoints->Begin();

  while (inputPoint != inPoints->End())
  {
    outputPoint.Value() = m_Transform->TransformPoint(inputPoint.Value());

    ++inputPoint;
    ++outputPoint;
  }

  // Create duplicate references to the rest of data on the mesh
  this->CopyInputMeshToOutputMeshPointData();
  this->CopyInputMeshToOutputMeshCellLinks();
  this->CopyInputMeshToOutputMeshCells();
  this->CopyInputMeshToOutputMeshCellData();

  // FIXME: DELETEME outputMesh->SetCellLinks(  inputMesh->GetCellLinks() );
  // FIXME: DELETEME outputMesh->SetCells(  inputMesh->GetCells() );
  // FIXME: DELETEME outputMesh->SetCellData(  inputMesh->GetCellData() );

  const unsigned int maxDimension = TInputMesh::MaxTopologicalDimension;

  for (unsigned int dim = 0; dim < maxDimension; ++dim)
  {
    outputMesh->SetBoundaryAssignments(dim, inputMesh->GetBoundaryAssignments(dim));
  }
}
} // end namespace itk

#endif
