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/* Copyright 2019 David Grote
 *
 * This file is part of WarpX.
 *
 * License: BSD-3-Clause-LBNL
 */
#ifndef WARPX_SPECTRAL_BASE_ALGORITHM_RZ_H_
#define WARPX_SPECTRAL_BASE_ALGORITHM_RZ_H_

#include "FieldSolver/SpectralSolver/SpectralKSpaceRZ.H"
#include "FieldSolver/SpectralSolver/SpectralFieldDataRZ.H"

/* \brief Class that updates the field in spectral space
 * and stores the coefficients of the corresponding update equation.
 *
 * `SpectralBaseAlgorithmRZ` is only a base class and cannot be used directly.
 * Instead use its subclasses, which implement the specific field update
 * equations for a given spectral algorithm.
 */
class SpectralBaseAlgorithmRZ
{
    public:
        // Virtual member function ; meant to be overridden in subclasses
        virtual void pushSpectralFields(SpectralFieldDataRZ & f) = 0;
        virtual int getRequiredNumberOfFields() const = 0;
        // The destructor should also be a virtual function, so that
        // a pointer to subclass of `SpectraBaseAlgorithm` actually
        // calls the subclass's destructor.
        virtual ~SpectralBaseAlgorithmRZ() {}

        /**
         * \brief Virtual function for current correction in Fourier space
         * (<a href="https://doi.org/10.1016/j.jcp.2013.03.010"> Vay et al, 2013</a>).
         * This virtual function is pure and must be defined in derived classes.
         *
         * \param[in,out] field_data All fields in Fourier space
         * \param[in,out] current    Array of unique pointers to \c MultiFab storing
         *                           the three components of the current density
         * \param[in]     rho        Unique pointer to \c MultiFab storing the charge density
         */
        virtual void CurrentCorrection ( const int lev, SpectralFieldDataRZ& field_data,
                                         std::array<std::unique_ptr<amrex::MultiFab>,3>& current,
                                         const std::unique_ptr<amrex::MultiFab>& rho ) = 0;

        /**
         * \brief Compute spectral divergence of E
         */
        void ComputeSpectralDivE ( const int lev,
                                   SpectralFieldDataRZ& field_data,
                                   const std::array<std::unique_ptr<amrex::MultiFab>,3>& Efield,
                                   amrex::MultiFab& divE );

        /**
         * \brief Virtual function for Vay current deposition in Fourier space
         * (<a href="https://doi.org/10.1016/j.jcp.2013.03.010"> Vay et al, 2013</a>).
         * This virtual function is pure and must be defined in derived classes.
         *
         * \param[in,out] field_data All fields in Fourier space
         * \param[in,out] current    Array of unique pointers to \c MultiFab storing
         *                           the three components of the current density
         */
        virtual void VayDeposition (const int lev,
                                    SpectralFieldDataRZ& field_data,
                                    std::array<std::unique_ptr<amrex::MultiFab>,3>& current) = 0;

    protected: // Meant to be used in the subclasses

        using SpectralRealCoefficients = amrex::FabArray< amrex::BaseFab <amrex::Real> >;
        using SpectralComplexCoefficients = amrex::FabArray< amrex::BaseFab <Complex> >;

        // Constructor
        SpectralBaseAlgorithmRZ(SpectralKSpaceRZ const & spectral_kspace,
                                amrex::DistributionMapping const & dm,
                                int const norder_z, bool const nodal)
          // Compute and assign the modified k vectors
          : modified_kz_vec(spectral_kspace.getModifiedKComponent(dm, 1, norder_z, nodal))
          {}

        // Modified finite-order vectors
        KVectorComponent modified_kz_vec;
};

#endif // WARPX_SPECTRAL_BASE_ALGORITHM_RZ_H_
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