/*=========================================================================
 *
 * 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 itkFEMElement3DMembrane1DOF_hxx
#define itkFEMElement3DMembrane1DOF_hxx


namespace itk
{
namespace fem
{
template <typename TBaseClass>
Element3DMembrane1DOF<TBaseClass>::Element3DMembrane1DOF()
  : Superclass()
  , m_Mat(nullptr)
{}

// ////////////////////////////////////////////////////////////////////////
/*
 * Methods related to the physics of the problem.
 */

template <typename TBaseClass>
void
Element3DMembrane1DOF<TBaseClass>::GetStrainDisplacementMatrix(MatrixType & /*HACK B*/,
                                                               const MatrixType & /*HACK shapeDgl*/) const
{
  // HACK:  Comment.
}

template <typename TBaseClass>
void
Element3DMembrane1DOF<TBaseClass>::GetMassMatrix(MatrixType & Me) const
{
  // Call the parent's get matrix function
  Superclass::GetMassMatrix(Me);

  // Since parent class doesn't have the material properties,
  // we need to adjust Me matrix here for the density of the element.
  Me = Me * m_Mat->GetDensityHeatProduct();
}

template <typename TBaseClass>
void
Element3DMembrane1DOF<TBaseClass>::GetMaterialMatrix(MatrixType & D) const
{
  unsigned int d = 3;

  D.set_size(d, d);

  D.fill(0.0);

  // This is the main difference from the linear elasticity problem.
  /* Material properties matrix.  Simpler than linear elasticity. */
  Float disot = m_Mat->GetYoungsModulus();
  for (unsigned int i = 0; i < d; ++i)
  {
    D[i][i] = disot;
  }
}

template <typename TBaseClass>
void
Element3DMembrane1DOF<TBaseClass>::GetStiffnessMatrix(MatrixType & Ke) const
{
  Superclass::GetStiffnessMatrix(Ke);
}

template <typename TBaseClass>
void
Element3DMembrane1DOF<TBaseClass>::PrintSelf(std::ostream & os, Indent indent) const
{
  Superclass::PrintSelf(os, indent);
  os << indent << "Materials: " << this->m_Mat << std::endl;
}

} // end namespace fem
} // end namespace itk

#endif