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// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
// vi: set et ts=4 sw=4 sts=4:
/*****************************************************************************
 *   See the file COPYING for full copying permissions.                      *
 *                                                                           *
 *   This program is free software: you can redistribute it and/or modify    *
 *   it under the terms of the GNU General Public License as published by    *
 *   the Free Software Foundation, either version 2 of the License, or       *
 *   (at your option) any later version.                                     *
 *                                                                           *
 *   This program is distributed in the hope that it will be useful,         *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of          *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the            *
 *   GNU General Public License for more details.                            *
 *                                                                           *
 *   You should have received a copy of the GNU General Public License       *
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.   *
 *****************************************************************************/
/*!
 * \file
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 * \ingroup Common
 * \brief Base class for all finite volume problems
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 */
#ifndef DUMUX_FV_PROBLEM_HH
#define DUMUX_FV_PROBLEM_HH

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#include <memory>
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#include <map>
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#include <dune/common/fvector.hh>
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#include <dune/grid/common/gridenums.hh>
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#include <dumux/common/properties.hh>
#include <dumux/common/parameters.hh>
#include <dumux/discretization/methods.hh>
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namespace Dumux {
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/*!
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 * \ingroup Common
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 * \brief Base class for all finite-volume problems
 *
 * \note All quantities (regarding the units) are specified assuming a
 *       three-dimensional world. Problems discretized using 2D grids
 *       are assumed to be extruded by \f$1 m\f$ and 1D grids are assumed
 *       to have a cross section of \f$1m \times 1m\f$.
 */
template<class TypeTag>
class FVProblem
{
    using Implementation = typename GET_PROP_TYPE(TypeTag, Problem);
    using GridView = typename GET_PROP_TYPE(TypeTag, GridView);
    using Scalar = typename GET_PROP_TYPE(TypeTag, Scalar);
    using PrimaryVariables = typename GET_PROP_TYPE(TypeTag, PrimaryVariables);
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    using NumEqVector = typename GET_PROP_TYPE(TypeTag, NumEqVector);
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    using FVGridGeometry = typename GET_PROP_TYPE(TypeTag, FVGridGeometry);
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    using FVElementGeometry = typename GET_PROP_TYPE(TypeTag, FVGridGeometry)::LocalView;
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    using SubControlVolume = typename FVElementGeometry::SubControlVolume;
    using SubControlVolumeFace = typename FVElementGeometry::SubControlVolumeFace;
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    using BoundaryTypes = typename GET_PROP_TYPE(TypeTag, BoundaryTypes);
    using PointSource = typename GET_PROP_TYPE(TypeTag, PointSource);
    using PointSourceHelper = typename GET_PROP_TYPE(TypeTag, PointSourceHelper);
    using SolutionVector = typename GET_PROP_TYPE(TypeTag, SolutionVector);
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    using VolumeVariables = typename GET_PROP_TYPE(TypeTag, VolumeVariables);
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    using ElementVolumeVariables = typename GET_PROP_TYPE(TypeTag, GridVolumeVariables)::LocalView;
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    enum {
        dim = GridView::dimension,
        dimWorld = GridView::dimensionworld
    };

    using Element = typename GridView::template Codim<0>::Entity;
    using CoordScalar = typename GridView::ctype;
    using GlobalPosition = Dune::FieldVector<CoordScalar, dimWorld>;

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    static constexpr bool isBox = GET_PROP_TYPE(TypeTag, FVGridGeometry)::discMethod == DiscretizationMethod::box;
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    using PointSourceMap = std::map<std::pair<std::size_t, std::size_t>,
                                    std::vector<PointSource> >;

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public:
    /*!
     * \brief Constructor
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     * \param fvGridGeometry The finite volume grid geometry
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     * \param paramGroup The parameter group in which to look for runtime parameters first (default is "")
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     */
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    FVProblem(std::shared_ptr<const FVGridGeometry> fvGridGeometry, const std::string& paramGroup = "")
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    : fvGridGeometry_(fvGridGeometry)
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    , paramGroup_(paramGroup)
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    {
        // set a default name for the problem
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        problemName_ = getParamFromGroup<std::string>(paramGroup, "Problem.Name");
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    }

    /*!
     * \brief The problem name.
     *
     * This is used as a prefix for files generated by the simulation.
     * It could be either overwritten by the problem files, or simply
     * declared over the setName() function in the application file.
     */
    const std::string& name() const
    {
        return problemName_;
    }

    /*!
     * \brief Set the problem name.
     *
     * This static method sets the simulation name, which should be
     * called before the application problem is declared! If not, the
     * default name "sim" will be used.
     *
     * \param newName The problem's name
     */
    void setName(const std::string& newName)
    {
        problemName_ = newName;
    }

    /*!
     * \name Boundary conditions and sources defining the problem
     */
    // \{

    /*!
     * \brief Specifies which kind of boundary condition should be
     *        used for which equation on a given boundary segment.
     *
     * \param element The finite element
     * \param scv The sub control volume
     */
    BoundaryTypes boundaryTypes(const Element &element,
                                const SubControlVolume &scv) const
    {
        if (!isBox)
            DUNE_THROW(Dune::InvalidStateException,
                       "boundaryTypes(..., scv) called for cell-centered method.");

        // forward it to the method which only takes the global coordinate
        return asImp_().boundaryTypesAtPos(scv.dofPosition());
    }

    /*!
     * \brief Specifies which kind of boundary condition should be
     *        used for which equation on a given boundary segment.
     *
     * \param element The finite element
     * \param scvf The sub control volume face
     */
    BoundaryTypes boundaryTypes(const Element &element,
                                const SubControlVolumeFace &scvf) const
    {
        if (isBox)
            DUNE_THROW(Dune::InvalidStateException,
                       "boundaryTypes(..., scvf) called for box method.");

        // forward it to the method which only takes the global coordinate
        return asImp_().boundaryTypesAtPos(scvf.ipGlobal());
    }

    /*!
     * \brief Specifies which kind of boundary condition should be
     *        used for which equation on a given boundary segment.
     *
     * \param globalPos The position of the finite volume in global coordinates
     */
    BoundaryTypes boundaryTypesAtPos(const GlobalPosition &globalPos) const
    {
        //! As a default, i.e. if the user's problem does not overload any boundaryTypes method
        //! set Dirichlet boundary conditions everywhere for all primary variables
        BoundaryTypes bcTypes;
        bcTypes.setAllDirichlet();
        return bcTypes;
    }

    /*!
     * \brief Evaluate the boundary conditions for a dirichlet
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     *        control volume face.
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     *
     * \param element The finite element
     * \param scvf the sub control volume face
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     * \note used for cell-centered discretization schemes
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     *
     * The method returns the boundary types information.
     */
    PrimaryVariables dirichlet(const Element &element, const SubControlVolumeFace &scvf) const
    {
        // forward it to the method which only takes the global coordinate
        if (isBox)
        {
            DUNE_THROW(Dune::InvalidStateException, "dirichlet(scvf) called for box method.");
        }
        else
            return asImp_().dirichletAtPos(scvf.ipGlobal());
    }

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    /*!
     * \brief Evaluate the boundary conditions for a dirichlet
     *        control volume.
     *
     * \param element The finite element
     * \param scv the sub control volume
     * \note used for cell-centered discretization schemes
     *
     * The method returns the boundary types information.
     */
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    PrimaryVariables dirichlet(const Element &element, const SubControlVolume &scv) const
    {
        // forward it to the method which only takes the global coordinate
        if (!isBox)
        {
            DUNE_THROW(Dune::InvalidStateException, "dirichlet(scv) called for cell-centered method.");
        }
        else
            return asImp_().dirichletAtPos(scv.dofPosition());
    }

    /*!
     * \brief Evaluate the boundary conditions for a dirichlet
     *        control volume.
     *
     * \param globalPos The position of the center of the finite volume
     *            for which the dirichlet condition ought to be
     *            set in global coordinates
     */
    PrimaryVariables dirichletAtPos(const GlobalPosition &globalPos) const
    {
        // Throw an exception (there is no reasonable default value
        // for Dirichlet conditions)
        DUNE_THROW(Dune::InvalidStateException,
                   "The problem specifies that some boundary "
                   "segments are dirichlet, but does not provide "
                   "a dirichlet() or a dirichletAtPos() method.");
    }

    /*!
     * \brief Evaluate the boundary conditions for a neumann
     *        boundary segment.
     *
     * This is the method for the case where the Neumann condition is
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     * potentially solution dependent
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     *
     * \param element The finite element
     * \param fvGeometry The finite-volume geometry
     * \param elemVolVars All volume variables for the element
     * \param scvf The sub control volume face
     *
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     * Negative values mean influx.
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     * E.g. for the mass balance that would the mass flux in \f$ [ kg / (m^2 \cdot s)] \f$.
     */
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    NumEqVector neumann(const Element& element,
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                        const FVElementGeometry& fvGeometry,
                        const ElementVolumeVariables& elemVolVars,
                        const SubControlVolumeFace& scvf) const
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    {
        // forward it to the interface with only the global position
        return asImp_().neumannAtPos(scvf.ipGlobal());
    }

    /*!
     * \brief Evaluate the boundary conditions for a neumann
     *        boundary segment.
     *
     * \param globalPos The position of the boundary face's integration point in global coordinates
     *
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     * Negative values mean influx.
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     * E.g. for the mass balance that would be the mass flux in \f$ [ kg / (m^2 \cdot s)] \f$.
     */
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    NumEqVector neumannAtPos(const GlobalPosition &globalPos) const
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    {
        //! As a default, i.e. if the user's problem does not overload any neumann method
        //! return no-flow Neumann boundary conditions at all Neumann boundaries
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        return NumEqVector(0.0);
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    }

    /*!
     * \brief Evaluate the source term for all phases within a given
     *        sub-control-volume.
     *
     * This is the method for the case where the source term is
     * potentially solution dependent and requires some quantities that
     * are specific to the fully-implicit method.
     *
     * \param element The finite element
     * \param fvGeometry The finite-volume geometry
     * \param elemVolVars All volume variables for the element
     * \param scv The sub control volume
     *
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     * For this method, the return parameter stores the conserved quantity rate
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     * generated or annihilate per volume unit. Positive values mean
     * that the conserved quantity is created, negative ones mean that it vanishes.
     * E.g. for the mass balance that would be a mass rate in \f$ [ kg / (m^3 \cdot s)] \f$.
     */
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    NumEqVector source(const Element &element,
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                       const FVElementGeometry& fvGeometry,
                       const ElementVolumeVariables& elemVolVars,
                       const SubControlVolume &scv) const
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    {
        // forward to solution independent, fully-implicit specific interface
        return asImp_().sourceAtPos(scv.center());
    }

    /*!
     * \brief Evaluate the source term for all phases within a given
     *        sub-control-volume.
     *
     * \param globalPos The position of the center of the finite volume
     *            for which the source term ought to be
     *            specified in global coordinates
     *
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     * For this method, the values parameter stores the conserved quantity rate
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     * generated or annihilate per volume unit. Positive values mean
     * that the conserved quantity is created, negative ones mean that it vanishes.
     * E.g. for the mass balance that would be a mass rate in \f$ [ kg / (m^3 \cdot s)] \f$.
     */
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    NumEqVector sourceAtPos(const GlobalPosition &globalPos) const
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    {
        //! As a default, i.e. if the user's problem does not overload any source method
        //! return 0.0 (no source terms)
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        return NumEqVector(0.0);
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    }

    /*!
     * \brief Applies a vector of point sources. The point sources
     *        are possibly solution dependent.
     *
     * \param pointSources A vector of PointSource s that contain
              source values for all phases and space positions.
     *
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     * For this method, the values method of the point source
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     * has to return the absolute rate values in units
     * \f$ [ \textnormal{unit of conserved quantity} / s ] \f$.
     * Positive values mean that the conserved quantity is created, negative ones mean that it vanishes.
     * E.g. for the mass balance that would be a mass rate in \f$ [ kg / s ] \f$.
     */
    void addPointSources(std::vector<PointSource>& pointSources) const {}

    /*!
     * \brief Evaluate the point sources (added by addPointSources)
     *        for all phases within a given sub-control-volume.
     *
     * This is the method for the case where the point source is
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     * solution dependent
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     *
     * \param source A single point source
     * \param element The finite element
     * \param fvGeometry The finite-volume geometry
     * \param elemVolVars All volume variables for the element
     * \param scv The sub control volume
     *
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     * For this method, the values() method of the point sources returns
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     * the absolute conserved quantity rate generated or annihilate in
     * units \f$ [ \textnormal{unit of conserved quantity} / s ] \f$.
     * Positive values mean that the conserved quantity is created, negative ones mean that it vanishes.
     * E.g. for the mass balance that would be a mass rate in \f$ [ kg / s ] \f$.
     */
    void pointSource(PointSource& source,
                     const Element &element,
                     const FVElementGeometry& fvGeometry,
                     const ElementVolumeVariables& elemVolVars,
                     const SubControlVolume &scv) const
    {
        // forward to space dependent interface method
        asImp_().pointSourceAtPos(source, source.position());
    }

    /*!
     * \brief Evaluate the point sources (added by addPointSources)
     *        for all phases within a given sub-control-volume.
     *
     * This is the method for the case where the point source is space dependent
     *
     * \param pointSource A single point source
     * \param globalPos The point source position in global coordinates
     *
     * For this method, the \a values() method of the point sources returns
     * the absolute conserved quantity rate generated or annihilate in
     * units \f$ [ \textnormal{unit of conserved quantity} / s ] \f$. Positive values mean
     * that the conserved quantity is created, negative ones mean that it vanishes.
     * E.g. for the mass balance that would be a mass rate in \f$ [ kg / s ] \f$.
     */
    void pointSourceAtPos(PointSource& pointSource,
                          const GlobalPosition &globalPos) const {}

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    /*!
     * \brief Add source term derivative to the Jacobian
     * \note Only needed in case of analytic differentiation and solution dependent sources
     */
    template<class MatrixBlock>
    void addSourceDerivatives(MatrixBlock& block,
                              const Element& element,
                              const FVElementGeometry& fvGeometry,
                              const VolumeVariables& volVars,
                              const SubControlVolume& scv) const {}

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    /*!
     * \brief Adds contribution of point sources for a specific sub control volume
     *        to the values.
     *        Caution: Only overload this method in the implementation if you know
     *                 what you are doing.
     */
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    NumEqVector scvPointSources(const Element &element,
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                                const FVElementGeometry& fvGeometry,
                                const ElementVolumeVariables& elemVolVars,
                                const SubControlVolume &scv) const
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    {
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        NumEqVector source(0);
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        auto scvIdx = scv.indexInElement();
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        auto key = std::make_pair(fvGridGeometry_->elementMapper().index(element), scvIdx);
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        if (pointSourceMap_.count(key))
        {
            // call the solDependent function. Herein the user might fill/add values to the point sources
            // we make a copy of the local point sources here
            auto pointSources = pointSourceMap_.at(key);

            // Add the contributions to the dof source values
            // We divide by the volume. In the local residual this will be multiplied with the same
            // factor again. That's because the user specifies absolute values in kg/s.
            const Scalar volume = scv.volume()*elemVolVars[scv].extrusionFactor();

            for (auto&& pointSource : pointSources)
            {
                // Note: two concepts are implemented here. The PointSource property can be set to a
                // customized point source function achieving variable point sources,
                // see TimeDependentPointSource for an example. The second imitated the standard
                // dumux source interface with solDependentPointSource / pointSourceAtPos, methods
                // that can be overloaded in the actual problem class also achieving variable point sources.
                // The first one is more convenient for simple function like a time dependent source.
                // The second one might be more convenient for e.g. a solution dependent point source.

                // we do an update e.g. used for TimeDependentPointSource
                pointSource.update(asImp_(), element, fvGeometry, elemVolVars, scv);
                // call convienience problem interface function
                asImp_().pointSource(pointSource, element, fvGeometry, elemVolVars, scv);
                // at last take care about multiplying with the correct volume
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                pointSource /= volume*pointSource.embeddings();
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                // add the point source values to the local residual
                source += pointSource.values();
            }
        }

        return source;
    }

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    /*!
     * \brief Compute the point source map, i.e. which scvs have point source contributions
     * \note Call this on the problem before assembly if you want to enable point sources set
     *       via the addPointSources member function.
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     */
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    void computePointSourceMap()
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    {
        // clear the given point source maps in case it's not empty
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        pointSourceMap_.clear();
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        // get and apply point sources if any given in the problem
        std::vector<PointSource> sources;
        asImp_().addPointSources(sources);

        // if there are point sources compute the DOF to point source map
        if (!sources.empty())
        {
            // calculate point source locations and save them in a map
            PointSourceHelper::computePointSourceMap(*fvGridGeometry_,
                                                     sources,
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                                                     pointSourceMap_);
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        }
    }

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    /*!
     * \brief Get the point source map. It stores the point sources per scv
     */
    const PointSourceMap& pointSourceMap() const
    { return pointSourceMap_; }

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    /*!
     * \brief Applies the initial solution for all degrees of freedom of the grid.
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     * \param sol the initial solution vector
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     */
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    void applyInitialSolution(SolutionVector& sol) const
    {
        // set the initial values by forwarding to a specialized method
        applyInitialSolutionImpl_(sol, std::integral_constant<bool, isBox>());
    }

    /*!
     * \brief Evaluate the initial value for
     * an element (for cell-centered models)
     * or vertex (for box / vertex-centered models)
     *
     * \param entity The dof entity (element or vertex)
     */
    template<class Entity>
    PrimaryVariables initial(const Entity& entity) const
    {
        static_assert(int(Entity::codimension) == 0 || int(Entity::codimension) == dim, "Entity must be element or vertex");
        return asImp_().initialAtPos(entity.geometry().center());
    }

    /*!
     * \brief Evaluate the initial value for a control volume.
     *
     * \param globalPos The global position
     */
    PrimaryVariables initialAtPos(const GlobalPosition &globalPos) const
    {
        // Throw an exception (there is no reasonable default value
        // for initial values)
        DUNE_THROW(Dune::InvalidStateException,
                   "The problem does not provide "
                   "an initial() or an initialAtPos() method.");
    }

    /*!
     * \brief Return how much the domain is extruded at a given sub-control volume.
     *
     * This means the factor by which a lower-dimensional (1D or 2D)
     * entity needs to be expanded to get a full dimensional cell. The
     * default is 1.0 which means that 1D problems are actually
     * thought as pipes with a cross section of 1 m^2 and 2D problems
     * are assumed to extend 1 m to the back.
     */
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    template<class ElementSolution>
    Scalar extrusionFactor(const Element& element,
                           const SubControlVolume& scv,
                           const ElementSolution& elemSol) const
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    {
        // forward to generic interface
        return asImp_().extrusionFactorAtPos(scv.center());
    }

    /*!
     * \brief Return how much the domain is extruded at a given position.
     *
     * This means the factor by which a lower-dimensional (1D or 2D)
     * entity needs to be expanded to get a full dimensional cell. The
     * default is 1.0 which means that 1D problems are actually
     * thought as pipes with a cross section of 1 m^2 and 2D problems
     * are assumed to extend 1 m to the back.
     */
    Scalar extrusionFactorAtPos(const GlobalPosition &globalPos) const
    {
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        // As a default, i.e. if the user's problem does not overload
        // any extrusion factor method, return 1.0
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        return 1.0;
    }

    // \}

    //! The finite volume grid geometry
    const FVGridGeometry& fvGridGeometry() const
    { return *fvGridGeometry_; }

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    //! The parameter group in which to retrieve runtime parameters
    const std::string& paramGroup() const
    { return paramGroup_; }

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protected:
    //! Returns the implementation of the problem (i.e. static polymorphism)
    Implementation &asImp_()
    { return *static_cast<Implementation *>(this); }

    //! \copydoc asImp_()
    const Implementation &asImp_() const
    { return *static_cast<const Implementation *>(this); }

private:
    /*!
     * \brief Applies the initial solution for the box method
     */
    void applyInitialSolutionImpl_(SolutionVector& sol, /*isBox=*/std::true_type) const
    {
        for (const auto& vertex : vertices(fvGridGeometry_->gridView()))
        {
            const auto dofIdxGlobal = fvGridGeometry_->vertexMapper().index(vertex);
            sol[dofIdxGlobal] = asImp_().initial(vertex);
        }
    }

    /*!
     * \brief Applies the initial solution for cell-centered methods
     */
    void applyInitialSolutionImpl_(SolutionVector& sol, /*isBox=*/std::false_type) const
    {
        for (const auto& element : elements(fvGridGeometry_->gridView()))
        {
            const auto dofIdxGlobal = fvGridGeometry_->elementMapper().index(element);
            sol[dofIdxGlobal] = asImp_().initial(element);
        }
    }

    //! The finite volume grid geometry
    std::shared_ptr<const FVGridGeometry> fvGridGeometry_;

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    //! The parameter group in which to retrieve runtime parameters
    std::string paramGroup_;

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    //! The name of the problem
    std::string problemName_;

    //! A map from an scv to a vector of point sources
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    PointSourceMap pointSourceMap_;
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};

} // end namespace Dumux

#endif