/*=========================================================================
 *
 *  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 itkSpatialObjectDuplicator_hxx
#define itkSpatialObjectDuplicator_hxx


namespace itk
{
template <typename TInputSpatialObject>
SpatialObjectDuplicator<TInputSpatialObject>::SpatialObjectDuplicator()
{
  m_Input = nullptr;
  m_DuplicateSpatialObject = nullptr;
  m_InternalSpatialObjectTime = 0;
}

template <typename TInputSpatialObject>
void
SpatialObjectDuplicator<TInputSpatialObject>::CopyObject(const InternalSpatialObjectType * source,
                                                         InternalSpatialObjectType *       destination)
{
  using SOType = itk::SpatialObject<TInputSpatialObject::ObjectDimension>;

  typename SOType::Pointer newSO = source->Clone();
  destination->AddChild(newSO);
  destination->Update();

  using ChildrenListType = typename TInputSpatialObject::ChildrenListType;
  ChildrenListType *                        children = source->GetChildren();
  typename ChildrenListType::const_iterator it = children->begin();
  while (it != children->end())
  {
    this->CopyObject(*it, newSO);
    ++it;
  }
  delete children;
}

template <typename TInputSpatialObject>
void
SpatialObjectDuplicator<TInputSpatialObject>::Update()
{
  if (!m_Input)
  {
    itkExceptionMacro("Input SpatialObject has not been connected");
  }

  // Update only if the input SpatialObject has been modified
  ModifiedTimeType t, t1, t2;
  t1 = m_Input->GetPipelineMTime();
  t2 = m_Input->GetMTime();
  t = (t1 > t2 ? t1 : t2);

  if (t == m_InternalSpatialObjectTime)
  {
    return; // No need to update
  }

  // Cache the timestamp
  m_InternalSpatialObjectTime = t;

  m_DuplicateSpatialObject = m_Input->Clone();
  m_DuplicateSpatialObject->Update();

  // Create the children
  using ChildrenListType = typename TInputSpatialObject::ChildrenListType;
  ChildrenListType *                        children = m_Input->GetChildren();
  typename ChildrenListType::const_iterator it = children->begin();
  while (it != children->end())
  {
    this->CopyObject(*it, m_DuplicateSpatialObject);
    ++it;
  }
  delete children;
}

template <typename TInputSpatialObject>
void
SpatialObjectDuplicator<TInputSpatialObject>::PrintSelf(std::ostream & os, Indent indent) const
{
  Superclass::PrintSelf(os, indent);
  os << indent << "Input SpatialObject: " << m_Input << std::endl;
  os << indent << "Output SpatialObject: " << m_DuplicateSpatialObject << std::endl;
  os << indent << "Internal SpatialObject Time: " << m_InternalSpatialObjectTime << std::endl;
}
} // end namespace itk

#endif