///////////////////////////////////////////////////////////////////////////////
//
// File: DiffusionLDGNS.h
//
// For more information, please see: http://www.nektar.info
//
// The MIT License
//
// Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
// Department of Aeronautics, Imperial College London (UK), and Scientific
// Computing and Imaging Institute, University of Utah (USA).
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
// Description: LDG diffusion class.
//
///////////////////////////////////////////////////////////////////////////////

#ifndef NEKTAR_SOLVERS_COMPRESSIBLEFLOWSOLVER_DIFFUSIONLDGNS
#define NEKTAR_SOLVERS_COMPRESSIBLEFLOWSOLVER_DIFFUSIONLDGNS

#include <CompressibleFlowSolver/Misc/EquationOfState.h>
#include <LocalRegions/Expansion2D.h>
#include <LocalRegions/Expansion3D.h>
#include <SolverUtils/Diffusion/Diffusion.h>

using namespace Nektar::SolverUtils;

namespace Nektar
{
class DiffusionLDGNS : public Diffusion
{
public:
    static DiffusionSharedPtr create([[maybe_unused]] std::string diffType)
    {
        return DiffusionSharedPtr(new DiffusionLDGNS());
    }

    static std::string type;

protected:
    /// Penalty coefficient for LDGNS
    NekDouble m_C11;

    /// h scaling for penalty term
    Array<OneD, NekDouble> m_traceOneOverH;

    Array<OneD, Array<OneD, NekDouble>> m_traceVel;
    Array<OneD, Array<OneD, NekDouble>> m_traceNormals;
    LibUtilities::SessionReaderSharedPtr m_session;
    NekDouble m_Twall;

    /// Equation of system for computing temperature
    EquationOfStateSharedPtr m_eos;

    TensorOfArray3D<NekDouble> m_viscTensor;

    Array<OneD, Array<OneD, NekDouble>> m_homoDerivs;

    std::size_t m_spaceDim;
    std::size_t m_diffDim;

    DiffusionLDGNS() = default;

    void v_InitObject(
        LibUtilities::SessionReaderSharedPtr pSession,
        Array<OneD, MultiRegions::ExpListSharedPtr> pFields) override;

    void v_Diffuse(const std::size_t nConvective,
                   const Array<OneD, MultiRegions::ExpListSharedPtr> &fields,
                   const Array<OneD, Array<OneD, NekDouble>> &inarray,
                   Array<OneD, Array<OneD, NekDouble>> &outarray,
                   const Array<OneD, Array<OneD, NekDouble>> &pFwd,
                   const Array<OneD, Array<OneD, NekDouble>> &pBwd) override;

    void v_DiffuseCoeffs(
        const std::size_t nConvective,
        const Array<OneD, MultiRegions::ExpListSharedPtr> &fields,
        const Array<OneD, Array<OneD, NekDouble>> &inarray,
        Array<OneD, Array<OneD, NekDouble>> &outarray,
        const Array<OneD, Array<OneD, NekDouble>> &pFwd,
        const Array<OneD, Array<OneD, NekDouble>> &pBwd) override;

    void v_DiffuseCalcDerivative(
        const Array<OneD, MultiRegions::ExpListSharedPtr> &fields,
        const Array<OneD, Array<OneD, NekDouble>> &inarray,
        TensorOfArray3D<NekDouble> &qfields,
        const Array<OneD, Array<OneD, NekDouble>> &pFwd,
        const Array<OneD, Array<OneD, NekDouble>> &pBwd) override;

    void v_DiffuseVolumeFlux(
        const Array<OneD, MultiRegions::ExpListSharedPtr> &fields,
        const Array<OneD, Array<OneD, NekDouble>> &inarray,
        TensorOfArray3D<NekDouble> &qfields,
        TensorOfArray3D<NekDouble> &VolumeFlux,
        Array<OneD, int> &nonZeroIndex) override;

    void v_DiffuseTraceFlux(
        const Array<OneD, MultiRegions::ExpListSharedPtr> &fields,
        const Array<OneD, Array<OneD, NekDouble>> &inarray,
        TensorOfArray3D<NekDouble> &qfields,
        TensorOfArray3D<NekDouble> &VolumeFlux,
        Array<OneD, Array<OneD, NekDouble>> &TraceFlux,
        const Array<OneD, Array<OneD, NekDouble>> &pFwd,
        const Array<OneD, Array<OneD, NekDouble>> &pBwd,
        Array<OneD, int> &nonZeroIndex) override;

    void v_SetHomoDerivs(Array<OneD, Array<OneD, NekDouble>> &deriv) override
    {
        m_homoDerivs = deriv;
    }

    TensorOfArray3D<NekDouble> &v_GetFluxTensor() override
    {
        return m_viscTensor;
    }

private:
    void NumericalFluxO1(
        const Array<OneD, MultiRegions::ExpListSharedPtr> &fields,
        const Array<OneD, Array<OneD, NekDouble>> &inarray,
        TensorOfArray3D<NekDouble> &numericalFluxO1,
        const Array<OneD, Array<OneD, NekDouble>> &pFwd,
        const Array<OneD, Array<OneD, NekDouble>> &pBwd);

    void ApplyBCsO1(const Array<OneD, MultiRegions::ExpListSharedPtr> &fields,
                    const Array<OneD, Array<OneD, NekDouble>> &inarray,
                    const Array<OneD, Array<OneD, NekDouble>> &pFwd,
                    const Array<OneD, Array<OneD, NekDouble>> &pBwd,
                    Array<OneD, Array<OneD, NekDouble>> &flux01);

    void NumericalFluxO2(
        const Array<OneD, MultiRegions::ExpListSharedPtr> &fields,
        TensorOfArray3D<NekDouble> &qfield,
        Array<OneD, Array<OneD, NekDouble>> &qflux,
        const Array<OneD, Array<OneD, NekDouble>> &pFwd,
        const Array<OneD, Array<OneD, NekDouble>> &pBwd);

    void ApplyBCsO2(const Array<OneD, MultiRegions::ExpListSharedPtr> &fields,
                    const std::size_t var, const std::size_t dir,
                    const Array<OneD, const NekDouble> &qfield,
                    const Array<OneD, const NekDouble> &qFwd,
                    const Array<OneD, const NekDouble> &qBwd,
                    Array<OneD, NekDouble> &penaltyflux);
};

typedef std::shared_ptr<DiffusionLDGNS> DiffusionLDGNSSharedPtr;
} // namespace Nektar

#endif
