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/*!
 * \file
 *
 * \brief The porous medium sub problem
 */
#ifndef DUMUX_DARCY2P2C_SUBPROBLEM_HH
#define DUMUX_DARCY2P2C_SUBPROBLEM_HH

#include <dumux/porousmediumflow/problem.hh>
#include <dumux/common/properties.hh>
#include <dumux/common/timeloop.hh>
#include <dumux/multidomain/boundary/stokesdarcy/couplingdata.hh>

namespace Dumux {

/*!
 * \brief The porous medium sub problem
 */
template <class TypeTag>
class PorousMediumSubProblem : public PorousMediumFlowProblem<TypeTag>
{
    using ParentType = PorousMediumFlowProblem<TypeTag>;
    using GridView = typename GetPropType<TypeTag, Properties::GridGeometry>::GridView;
    using Scalar = GetPropType<TypeTag, Properties::Scalar>;
    using PrimaryVariables = GetPropType<TypeTag, Properties::PrimaryVariables>;
    using NumEqVector = GetPropType<TypeTag, Properties::NumEqVector>;
    using BoundaryTypes = GetPropType<TypeTag, Properties::BoundaryTypes>;
    using VolumeVariables = GetPropType<TypeTag, Properties::VolumeVariables>;
    using FVElementGeometry = typename GetPropType<TypeTag, Properties::GridGeometry>::LocalView;
    using SubControlVolume = typename FVElementGeometry::SubControlVolume;
    using SubControlVolumeFace = typename FVElementGeometry::SubControlVolumeFace;
    using FVGridGeometry = GetPropType<TypeTag, Properties::GridGeometry>;
    using ElementVolumeVariables = typename GetPropType<TypeTag, Properties::GridVolumeVariables>::LocalView;
    using GridVariables = GetPropType<TypeTag, Properties::GridVariables>;
    using ElementFluxVariablesCache = typename GridVariables::GridFluxVariablesCache::LocalView;

    using FluidSystem = GetPropType<TypeTag, Properties::FluidSystem>;

    // copy some indices for convenience
    using Indices = typename GetPropType<TypeTag, Properties::ModelTraits>::Indices;
    enum {
        // primary variable indices
        conti0EqIdx = Indices::conti0EqIdx,
        contiWEqIdx = Indices::conti0EqIdx + FluidSystem::H2OIdx,
        contiNEqIdx = Indices::conti0EqIdx + FluidSystem::AirIdx,
        pressureIdx = Indices::pressureIdx,
        switchIdx = Indices::switchIdx
    };

    using Element = typename GridView::template Codim<0>::Entity;
    using GlobalPosition = typename Element::Geometry::GlobalCoordinate;

    using CouplingManager = GetPropType<TypeTag, Properties::CouplingManager>;
    using TimeLoopPtr = std::shared_ptr<TimeLoop<Scalar>>;

    using DiffusionCoefficientAveragingType = typename StokesDarcyCouplingOptions::DiffusionCoefficientAveragingType;

public:
    PorousMediumSubProblem(std::shared_ptr<const FVGridGeometry> fvGridGeometry,
                   std::shared_ptr<CouplingManager> couplingManager)
    : ParentType(fvGridGeometry, "Darcy"), eps_(1e-7), couplingManager_(couplingManager)
    {
        pressure_ = getParamFromGroup<Scalar>(this->paramGroup(), "Problem.Pressure");
        initialSw_ = getParamFromGroup<Scalar>(this->paramGroup(), "Problem.Saturation");
        temperature_ = getParamFromGroup<Scalar>(this->paramGroup(), "Problem.Temperature");
        initialPhasePresence_ = getParamFromGroup<int>(this->paramGroup(), "Problem.InitPhasePresence");

        diffCoeffAvgType_ = StokesDarcyCouplingOptions::stringToEnum(DiffusionCoefficientAveragingType{},
                                                                     getParamFromGroup<std::string>(this->paramGroup(), "Problem.InterfaceDiffusionCoefficientAvg"));
    }

    /*!
     * \name Simulation steering
     */
    // \{

    template<class SolutionVector, class GridVariables>
    void postTimeStep(const SolutionVector& curSol,
                      const GridVariables& gridVariables,
                      const Scalar timeStepSize)

    {
        // compute the mass in the entire domain
        Scalar massWater = 0.0;

        // bulk elements
        for (const auto& element : elements(this->gridGeometry().gridView()))
        {
            auto fvGeometry = localView(this->gridGeometry());
            fvGeometry.bindElement(element);

            auto elemVolVars = localView(gridVariables.curGridVolVars());
            elemVolVars.bindElement(element, fvGeometry, curSol);

            for (auto&& scv : scvs(fvGeometry))
            {
                const auto& volVars = elemVolVars[scv];
                for(int phaseIdx = 0; phaseIdx < FluidSystem::numPhases; ++phaseIdx)
                {
                    massWater += volVars.massFraction(phaseIdx, FluidSystem::H2OIdx)*volVars.density(phaseIdx)
                    * scv.volume() * volVars.saturation(phaseIdx) * volVars.porosity() * volVars.extrusionFactor();
                }
            }
        }

        std::cout << "mass of water is: " << massWater << std::endl;
    }

    /*!
     * \brief Return the temperature within the domain in [K].
     */
    Scalar temperature() const
    { return temperature_; }
    // \}

     /*!
     * \name Boundary conditions
     */
    // \{
    /*!
      * \brief Specifies which kind of boundary condition should be
      *        used for which equation on a given boundary control volume.
      *
      * \param element The element
      * \param scvf The boundary sub control volume face
      */
    BoundaryTypes boundaryTypes(const Element &element, const SubControlVolumeFace &scvf) const
    {
        BoundaryTypes values;
        values.setAllNeumann();

        if (couplingManager().isCoupledEntity(CouplingManager::darcyIdx, scvf))
            values.setAllCouplingNeumann();

        return values;
    }

    /*!
     * \brief Evaluate the boundary conditions for a Dirichlet control volume.
     *
     * \param element The element for which the Dirichlet boundary condition is set
     * \param scvf The boundary subcontrolvolumeface
     *
     * For this method, the \a values parameter stores primary variables.
     */
    PrimaryVariables dirichlet(const Element &element, const SubControlVolumeFace &scvf) const
    {
        PrimaryVariables values(0.0);
        values = initialAtPos(scvf.center());

        return values;
    }

    /*!
     * \brief Evaluate the boundary conditions for a Neumann
     *        control volume.
     *
     * \param element The element for which the Neumann boundary condition is set
     * \param fvGeomentry The fvGeometry
     * \param elemVolVars The element volume variables
     * \param scvf The boundary sub control volume face
     *
     */
    NumEqVector neumann(const Element& element,
                        const FVElementGeometry& fvGeometry,
                        const ElementVolumeVariables& elemVolVars,
                        const ElementFluxVariablesCache& elemFluxVarsCache,
                        const SubControlVolumeFace& scvf) const
    {
        NumEqVector values(0.0);

        if (couplingManager().isCoupledEntity(CouplingManager::darcyIdx, scvf))
        {
            const auto massFlux = couplingManager().couplingData().massCouplingCondition(element, fvGeometry, elemVolVars, scvf, diffCoeffAvgType_);

            for(int i = 0; i< massFlux.size(); ++i)
                values[i] = massFlux[i];

            values[Indices::energyEqIdx] = couplingManager().couplingData().energyCouplingCondition(element, fvGeometry, elemVolVars, scvf, diffCoeffAvgType_);
        }

        return values;
    }

    // \}

    /*!
     * \name Volume terms
     */
    // \{
    /*!
     * \brief Evaluate the source term for all phases within a given
     *        sub-control-volume.
     *
     * \param element The element for which the source term is set
     * \param fvGeomentry The fvGeometry
     * \param elemVolVars The element volume variables
     * \param scv The subcontrolvolume
     *
     * For this method, the \a values variable stores the rate mass
     * of a component is generated or annihilate per volume
     * unit. Positive values mean that mass is created, negative ones
     * mean that it vanishes.
     */
    NumEqVector source(const Element &element,
                       const FVElementGeometry& fvGeometry,
                       const ElementVolumeVariables& elemVolVars,
                       const SubControlVolume &scv) const
    { return NumEqVector(0.0); }

    // \}

    /*!
     * \brief Evaluate the initial value for a control volume.
     *
     * For this method, the \a priVars parameter stores primary
     * variables.
     */
    PrimaryVariables initialAtPos(const GlobalPosition &globalPos) const
    {
        PrimaryVariables values(0.0);
        values.setState(initialPhasePresence_);

        values[pressureIdx] = pressure_ + 1. * this->spatialParams().gravity(globalPos)[1] * (globalPos[1] - this->gridGeometry().bBoxMax()[1]);
        values[switchIdx] = initialSw_;
        values[Indices::temperatureIdx] = temperature_;

        return values;
    }

    // \}

    /*!
     * \brief Set the coupling manager
     */
    void setCouplingManager(std::shared_ptr<CouplingManager> cm)
    { couplingManager_ = cm; }

    /*!
     * \brief Get the coupling manager
     */
    const CouplingManager& couplingManager() const
    { return *couplingManager_; }

    void setTimeLoop(TimeLoopPtr timeLoop)
    { timeLoop_ = timeLoop; }

private:
    bool onLeftBoundary_(const GlobalPosition &globalPos) const
    { return globalPos[0] < this->gridGeometry().bBoxMin()[0] + eps_; }

    bool onRightBoundary_(const GlobalPosition &globalPos) const
    { return globalPos[0] > this->gridGeometry().bBoxMax()[0] - eps_; }

    bool onLowerBoundary_(const GlobalPosition &globalPos) const
    { return globalPos[1] < this->gridGeometry().bBoxMin()[1] + eps_; }

    bool onUpperBoundary_(const GlobalPosition &globalPos) const
    { return globalPos[1] > this->gridGeometry().bBoxMax()[1] - eps_; }

    Scalar pressure_;
    Scalar initialSw_;
    Scalar temperature_;
    int initialPhasePresence_;

    TimeLoopPtr timeLoop_;

    Scalar eps_;

    std::shared_ptr<CouplingManager> couplingManager_;
    DiffusionCoefficientAveragingType diffCoeffAvgType_;
};

} //end namespace dUMUX

#endif