/*=========================================================================
 *
 *  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 itkImageToSpatialObjectRegistrationMethod_hxx
#define itkImageToSpatialObjectRegistrationMethod_hxx


namespace itk
{

template <typename TFixedImage, typename TMovingSpatialObject>
ImageToSpatialObjectRegistrationMethod<TFixedImage, TMovingSpatialObject>::ImageToSpatialObjectRegistrationMethod()
{
  this->SetNumberOfRequiredOutputs(1); // for the Transform

  m_FixedImage = nullptr;          // has to be provided by the user
  m_MovingSpatialObject = nullptr; // has to be provided by the user
  m_Transform = nullptr;           // has to be provided by the user
  m_Interpolator = nullptr;        // has to be provided by the user
  m_Metric = nullptr;              // has to be provided by the user
  m_Optimizer = nullptr;           // has to be provided by the user

  m_InitialTransformParameters = ParametersType(1);
  m_LastTransformParameters = ParametersType(1);

  m_InitialTransformParameters.Fill(0.0f);
  m_LastTransformParameters.Fill(0.0f);

  TransformOutputPointer transformDecorator =
    itkDynamicCastInDebugMode<TransformOutputType *>(this->MakeOutput(0).GetPointer());

  this->ProcessObject::SetNthOutput(0, transformDecorator.GetPointer());
}

template <typename TFixedImage, typename TMovingSpatialObject>
void
ImageToSpatialObjectRegistrationMethod<TFixedImage, TMovingSpatialObject>::Initialize()
{
  if (!m_FixedImage)
  {
    itkExceptionMacro("FixedImage is not present");
  }

  if (!m_MovingSpatialObject)
  {
    itkExceptionMacro("MovingSpatialObject is not present");
  }

  if (!m_Metric)
  {
    itkExceptionMacro("Metric is not present");
  }

  if (!m_Optimizer)
  {
    itkExceptionMacro("Optimizer is not present");
  }

  if (!m_Transform)
  {
    itkExceptionMacro("Transform is not present");
  }

  if (!m_Interpolator)
  {
    itkExceptionMacro("Interpolator is not present");
  }

  m_Interpolator->SetInputImage(m_FixedImage);

  // Set up the metric
  m_Metric->SetFixedImage(m_FixedImage);
  m_Metric->SetMovingSpatialObject(m_MovingSpatialObject);
  m_Metric->SetTransform(m_Transform);
  m_Metric->SetInterpolator(m_Interpolator);
  m_Metric->Initialize();

  // Set up the optimizer
  m_Optimizer->SetCostFunction(m_Metric);

  // Validate initial transform parameters
  if (m_InitialTransformParameters.Size() != m_Metric->GetNumberOfParameters())
  {
    itkWarningMacro(" WARNING : Size mismatch between initial parameter and transform");
    itkWarningMacro("Resizing m_InitialTransformParameters to  " << m_Transform->GetNumberOfParameters());
    m_InitialTransformParameters.set_size(m_Transform->GetNumberOfParameters());
    m_InitialTransformParameters.Fill(0.0f);
  }

  if (m_LastTransformParameters.Size() != m_Transform->GetNumberOfParameters())
  {
    m_LastTransformParameters.set_size(m_Transform->GetNumberOfParameters());
    m_LastTransformParameters.Fill(0.0f);
  }

  m_Optimizer->SetInitialPosition(m_InitialTransformParameters);

  // Connect the transform to the Decorator
  auto * transformOutput = static_cast<TransformOutputType *>(this->ProcessObject::GetOutput(0));

  transformOutput->Set(m_Transform);
}

template <typename TFixedImage, typename TMovingSpatialObject>
void
ImageToSpatialObjectRegistrationMethod<TFixedImage, TMovingSpatialObject>::GenerateData()
{
  try
  {
    // Initialize the interconnects between components
    this->Initialize();
  }
  catch (const ExceptionObject &)
  {
    // Pass exception to caller
    throw;
  }

  try
  {
    // Do the optimization
    m_Optimizer->StartOptimization();
  }
  catch (const ExceptionObject &)
  {
    // An error has occurred in the optimization.
    // Update the parameters
    m_LastTransformParameters = m_Optimizer->GetCurrentPosition();
    // Pass exception to caller
    throw;
  }

  // Get the results
  m_LastTransformParameters = m_Optimizer->GetCurrentPosition();
}

template <typename TFixedImage, typename TMovingSpatialObject>
auto
ImageToSpatialObjectRegistrationMethod<TFixedImage, TMovingSpatialObject>::GetOutput() const
  -> const TransformOutputType *
{
  return static_cast<const TransformOutputType *>(this->ProcessObject::GetOutput(0));
}

template <typename TFixedImage, typename TMovingSpatialObject>
DataObject::Pointer
ImageToSpatialObjectRegistrationMethod<TFixedImage, TMovingSpatialObject>::MakeOutput(
  DataObjectPointerArraySizeType output)
{
  if (output > 0)
  {
    itkExceptionMacro("MakeOutput request for an output number larger than the expected number of outputs.");
  }
  return TransformOutputType::New().GetPointer();
}

template <typename TFixedImage, typename TMovingSpatialObject>
ModifiedTimeType
ImageToSpatialObjectRegistrationMethod<TFixedImage, TMovingSpatialObject>::GetMTime() const
{
  ModifiedTimeType mtime = Superclass::GetMTime();
  ModifiedTimeType m;

  // Some of the following should be removed once ivars are put in the
  // input and output lists

  if (m_Transform)
  {
    m = m_Transform->GetMTime();
    mtime = (m > mtime ? m : mtime);
  }

  if (m_Interpolator)
  {
    m = m_Interpolator->GetMTime();
    mtime = (m > mtime ? m : mtime);
  }

  if (m_Metric)
  {
    m = m_Metric->GetMTime();
    mtime = (m > mtime ? m : mtime);
  }

  if (m_Optimizer)
  {
    m = m_Optimizer->GetMTime();
    mtime = (m > mtime ? m : mtime);
  }

  if (m_FixedImage)
  {
    m = m_FixedImage->GetMTime();
    mtime = (m > mtime ? m : mtime);
  }

  if (m_MovingSpatialObject)
  {
    m = m_MovingSpatialObject->GetMTime();
    mtime = (m > mtime ? m : mtime);
  }

  return mtime;
}

template <typename TFixedImage, typename TMovingSpatialObject>
void
ImageToSpatialObjectRegistrationMethod<TFixedImage, TMovingSpatialObject>::PrintSelf(std::ostream & os,
                                                                                     Indent         indent) const
{
  Superclass::PrintSelf(os, indent);
  os << indent << "Metric: " << m_Metric.GetPointer() << std::endl;
  os << indent << "Optimizer: " << m_Optimizer.GetPointer() << std::endl;
  os << indent << "Transform: " << m_Transform.GetPointer() << std::endl;
  os << indent << "Interpolator: " << m_Interpolator.GetPointer() << std::endl;
  os << indent << "Fixed Image: " << m_FixedImage.GetPointer() << std::endl;
  os << indent << "Moving SpatialObject: " << m_MovingSpatialObject.GetPointer() << std::endl;
  os << indent << "Initial Transform Parameters: " << m_InitialTransformParameters << std::endl;
  os << indent << "Last    Transform Parameters: " << m_LastTransformParameters << std::endl;
}

} // end namespace itk

#endif