/*
  Copyright 2009, 2010 SINTEF ICT, Applied Mathematics.
  Copyright 2019 SINTEF Digital, Mathematics and Cybernetics.

  This file is part of the Open Porous Media project (OPM).

  OPM 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 3 of the License, or
  (at your option) any later version.

  OPM 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 OPM.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <config.h>

#include <opm/common/ErrorMacros.hpp>
#include <opm/common/TimingMacros.hpp>

#include <opm/simulators/linalg/PreconditionerFactory.hpp>

#include <opm/simulators/linalg/DILU.hpp>
#include <opm/simulators/linalg/ExtraSmoothers.hpp>
#include <opm/simulators/linalg/FlexibleSolver.hpp>
#include <opm/simulators/linalg/FlowLinearSolverParameters.hpp>
#include <opm/simulators/linalg/OwningBlockPreconditioner.hpp>
#include <opm/simulators/linalg/OwningTwoLevelPreconditioner.hpp>
#include <opm/simulators/linalg/ParallelOverlappingILU0.hpp>
#include <opm/simulators/linalg/PressureBhpTransferPolicy.hpp>
#include <opm/simulators/linalg/PressureTransferPolicy.hpp>
#include <opm/simulators/linalg/PropertyTree.hpp>
#include <opm/simulators/linalg/WellOperators.hpp>
#include <opm/simulators/linalg/amgcpr.hh>
#include <opm/simulators/linalg/ilufirstelement.hh>
#include <opm/simulators/linalg/matrixblock.hh>

#include <dune/common/unused.hh>
#include <dune/istl/owneroverlapcopy.hh>
#include <dune/istl/paamg/amg.hh>
#include <dune/istl/paamg/fastamg.hh>
#include <dune/istl/paamg/kamg.hh>
#include <dune/istl/preconditioners.hh>

// Include all cuistl/GPU preconditioners inside of this headerfile
#include <opm/simulators/linalg/PreconditionerFactoryGPUIncludeWrapper.hpp>

#if HAVE_HYPRE
#include <opm/simulators/linalg/HyprePreconditioner.hpp>
#endif

#if HAVE_AMGX
#include <opm/simulators/linalg/AmgxPreconditioner.hpp>
#endif

#include <cassert>

namespace Opm {

template <class Smoother>
struct AMGSmootherArgsHelper
{
    static auto args(const PropertyTree& prm)
    {
        using SmootherArgs = typename Dune::Amg::SmootherTraits<Smoother>::Arguments;
        SmootherArgs smootherArgs;
        smootherArgs.iterations = prm.get<int>("iterations", 1);
        // smootherArgs.overlap=SmootherArgs::vertex;
        // smootherArgs.overlap=SmootherArgs::none;
        // smootherArgs.overlap=SmootherArgs::aggregate;
        smootherArgs.relaxationFactor = prm.get<double>("relaxation", 1.0);
        return smootherArgs;
    }
};

template <class M, class V, class C>
struct AMGSmootherArgsHelper<ParallelOverlappingILU0<M, V, V, C>>
{
    static auto args(const PropertyTree& prm)
    {
        using Smoother = ParallelOverlappingILU0<M, V, V, C>;
        using SmootherArgs = typename Dune::Amg::SmootherTraits<Smoother>::Arguments;
        SmootherArgs smootherArgs;
        smootherArgs.iterations = prm.get<int>("iterations", 1);
        const int iluwitdh = prm.get<int>("iluwidth", 0);
        smootherArgs.setN(iluwitdh);
        const MILU_VARIANT milu = convertString2Milu(prm.get<std::string>("milutype", std::string("ilu")));
        smootherArgs.setMilu(milu);
        // smootherArgs.overlap=SmootherArgs::vertex;
        // smootherArgs.overlap=SmootherArgs::none;
        // smootherArgs.overlap=SmootherArgs::aggregate;
        smootherArgs.relaxationFactor = prm.get<double>("relaxation", 1.0);
        return smootherArgs;
    }
};

// trailing return type with decltype used for detecting existence of setUseFixedOrder member function by overloading the setUseFixedOrder function
template <typename C>
auto setUseFixedOrder(C& criterion, bool booleanValue) -> decltype(criterion.setUseFixedOrder(booleanValue))
{
    return criterion.setUseFixedOrder(booleanValue); // Set flag to ensure that the matrices in the AMG hierarchy are constructed with deterministic indices.
}
template <typename C>
void setUseFixedOrder(C&, ...)
{
    // do nothing, since the function setUseFixedOrder does not exist yet
}

template <class Operator, class Comm, class Matrix, class Vector>
typename AMGHelper<Operator, Comm, Matrix, Vector>::Criterion
AMGHelper<Operator, Comm, Matrix, Vector>::criterion(const PropertyTree& prm)
{
    Criterion criterion(15, prm.get<int>("coarsenTarget", 1200));
    criterion.setDefaultValuesIsotropic(2);
    criterion.setAlpha(prm.get<double>("alpha", 0.33));
    criterion.setBeta(prm.get<double>("beta", 1e-5));
    criterion.setMaxLevel(prm.get<int>("maxlevel", 15));
    criterion.setSkipIsolated(prm.get<bool>("skip_isolated", false));
    criterion.setNoPreSmoothSteps(prm.get<int>("pre_smooth", 1));
    criterion.setNoPostSmoothSteps(prm.get<int>("post_smooth", 1));
    criterion.setDebugLevel(prm.get<int>("verbosity", 0));
    // As the default we request to accumulate data to 1 process always as our matrix
    // graph might be unsymmetric and hence not supported by the PTScotch/ParMetis
    // calls in DUNE. Accumulating to 1 skips PTScotch/ParMetis
    criterion.setAccumulate(static_cast<Dune::Amg::AccumulationMode>(prm.get<int>("accumulate", 1)));
    criterion.setProlongationDampingFactor(prm.get<double>("prolongationdamping", 1.6));
    criterion.setMaxDistance(prm.get<int>("maxdistance", 2));
    criterion.setMaxConnectivity(prm.get<int>("maxconnectivity", 15));
    criterion.setMaxAggregateSize(prm.get<int>("maxaggsize", 6));
    criterion.setMinAggregateSize(prm.get<int>("minaggsize", 4));
    setUseFixedOrder(criterion, true); // If possible, set flag to ensure that the matrices in the AMG hierarchy are constructed with deterministic indices.
    return criterion;
}

template <class Operator, class Comm, class Matrix, class Vector>
template <class Smoother>
typename AMGHelper<Operator, Comm, Matrix, Vector>::PrecPtr
AMGHelper<Operator, Comm, Matrix, Vector>::makeAmgPreconditioner(const Operator& op,
                                                                 const PropertyTree& prm,
                                                                 bool useKamg)
{
    auto crit = criterion(prm);
    auto sargs = AMGSmootherArgsHelper<Smoother>::args(prm);
    if (useKamg) {
        using Type = Dune::DummyUpdatePreconditioner<Dune::Amg::KAMG<Operator, Vector, Smoother>>;
        return std::make_shared<Type>(
            op, crit, sargs, prm.get<std::size_t>("max_krylov", 1), prm.get<double>("min_reduction", 1e-1));
    } else {
        using Type = Dune::Amg::AMGCPR<Operator, Vector, Smoother>;
        return std::make_shared<Type>(op, crit, sargs);
    }
}

template <class Operator, class Comm>
struct StandardPreconditioners {
    static void add()
    {
        using namespace Dune;
        using O = Operator;
        using C = Comm;
        using F = PreconditionerFactory<O, C>;
        using M = typename F::Matrix;
        using V = typename F::Vector;
        using P = PropertyTree;
        F::addCreator("ILU0", [](const O& op, const P& prm, const std::function<V()>&, std::size_t, const C& comm) {
            return createParILU(op, prm, comm, 0);
        });
        F::addCreator("ParOverILU0",
                      [](const O& op, const P& prm, const std::function<V()>&, std::size_t, const C& comm) {
                          return createParILU(op, prm, comm, prm.get<int>("ilulevel", 0));
                      });
        F::addCreator("ILUn", [](const O& op, const P& prm, const std::function<V()>&, std::size_t, const C& comm) {
            return createParILU(op, prm, comm, prm.get<int>("ilulevel", 0));
        });
        F::addCreator("DuneILU", [](const O& op, const P& prm, const std::function<V()>&, std::size_t, const C& comm) {
            const int n = prm.get<int>("ilulevel", 0);
            const double w = prm.get<double>("relaxation", 1.0);
            const bool resort = prm.get<bool>("resort", false);
            return wrapBlockPreconditioner<RebuildOnUpdatePreconditioner<Dune::SeqILU<M, V, V>>>(
                comm, op.getmat(), n, w, resort);
        });
        F::addCreator("DILU", [](const O& op, const P& prm, const std::function<V()>&, std::size_t, const C& comm) {
            DUNE_UNUSED_PARAMETER(prm);
            return wrapBlockPreconditioner<MultithreadDILU<M, V, V>>(comm, op.getmat());
        });
        F::addCreator("Jac", [](const O& op, const P& prm, const std::function<V()>&, std::size_t, const C& comm) {
            const int n = prm.get<int>("repeats", 1);
            const double w = prm.get<double>("relaxation", 1.0);
            return wrapBlockPreconditioner<DummyUpdatePreconditioner<SeqJac<M, V, V>>>(comm, op.getmat(), n, w);
        });
        F::addCreator("GS", [](const O& op, const P& prm, const std::function<V()>&, std::size_t, const C& comm) {
            const int n = prm.get<int>("repeats", 1);
            const double w = prm.get<double>("relaxation", 1.0);
            return wrapBlockPreconditioner<DummyUpdatePreconditioner<SeqGS<M, V, V>>>(comm, op.getmat(), n, w);
        });
        F::addCreator("SOR", [](const O& op, const P& prm, const std::function<V()>&, std::size_t, const C& comm) {
            const int n = prm.get<int>("repeats", 1);
            const double w = prm.get<double>("relaxation", 1.0);
            return wrapBlockPreconditioner<DummyUpdatePreconditioner<SeqSOR<M, V, V>>>(comm, op.getmat(), n, w);
        });
        F::addCreator("SSOR", [](const O& op, const P& prm, const std::function<V()>&, std::size_t, const C& comm) {
            const int n = prm.get<int>("repeats", 1);
            const double w = prm.get<double>("relaxation", 1.0);
            return wrapBlockPreconditioner<DummyUpdatePreconditioner<SeqSSOR<M, V, V>>>(comm, op.getmat(), n, w);
        });

        // Only add AMG preconditioners to the factory if the operator
        // is the overlapping schwarz operator. This could be extended
        // later, but at this point no other operators are compatible
        // with the AMG hierarchy construction.
        if constexpr (std::is_same_v<O, Dune::OverlappingSchwarzOperator<M, V, V, C>> ||
                      std::is_same_v<O, Opm::GhostLastMatrixAdapter<M, V, V, C>>) {
            F::addCreator("amg", [](const O& op, const P& prm, const std::function<V()>&, std::size_t, const C& comm) {
                using PrecPtr = std::shared_ptr<Dune::PreconditionerWithUpdate<V, V>>;
                const std::string smoother = prm.get<std::string>("smoother", "ParOverILU0");
                // TODO: merge this with ILUn, and possibly simplify the factory to only work with ILU?
                if (smoother == "ILU0" || smoother == "ParOverILU0") {
                    using Smoother = ParallelOverlappingILU0<M, V, V, C>;
                    auto crit = AMGHelper<O, C, M, V>::criterion(prm);
                    auto sargs = AMGSmootherArgsHelper<Smoother>::args(prm);
                    PrecPtr prec = std::make_shared<Dune::Amg::AMGCPR<O, V, Smoother, C>>(op, crit, sargs, comm);
                    return prec;
                } else if (smoother == "DILU") {
                    using SeqSmoother = Dune::MultithreadDILU<M, V, V>;
                    using Smoother = Dune::BlockPreconditioner<V, V, C, SeqSmoother>;
                    using SmootherArgs = typename Dune::Amg::SmootherTraits<Smoother>::Arguments;
                    SmootherArgs sargs;
                    auto crit = AMGHelper<O, C, M, V>::criterion(prm);
                    PrecPtr prec = std::make_shared<Dune::Amg::AMGCPR<O, V, Smoother, C>>(op, crit, sargs, comm);
                    return prec;
                } else if (smoother == "Jac") {
                    using SeqSmoother = SeqJac<M, V, V>;
                    using Smoother = Dune::BlockPreconditioner<V, V, C, SeqSmoother>;
                    using SmootherArgs = typename Dune::Amg::SmootherTraits<Smoother>::Arguments;
                    SmootherArgs sargs;
                    auto crit = AMGHelper<O, C, M, V>::criterion(prm);
                    PrecPtr prec = std::make_shared<Dune::Amg::AMGCPR<O, V, Smoother, C>>(op, crit, sargs, comm);
                    return prec;
                } else if (smoother == "GS") {
                    using SeqSmoother = SeqGS<M, V, V>;
                    using Smoother = Dune::BlockPreconditioner<V, V, C, SeqSmoother>;
                    using SmootherArgs = typename Dune::Amg::SmootherTraits<Smoother>::Arguments;
                    SmootherArgs sargs;
                    auto crit = AMGHelper<O, C, M, V>::criterion(prm);
                    PrecPtr prec = std::make_shared<Dune::Amg::AMGCPR<O, V, Smoother, C>>(op, crit, sargs, comm);
                    return prec;
                } else if (smoother == "SOR") {
                    using SeqSmoother = SeqSOR<M, V, V>;
                    using Smoother = Dune::BlockPreconditioner<V, V, C, SeqSmoother>;
                    using SmootherArgs = typename Dune::Amg::SmootherTraits<Smoother>::Arguments;
                    SmootherArgs sargs;
                    auto crit = AMGHelper<O, C, M, V>::criterion(prm);
                    PrecPtr prec = std::make_shared<Dune::Amg::AMGCPR<O, V, Smoother, C>>(op, crit, sargs, comm);
                    return prec;
                } else if (smoother == "SSOR") {
                    using SeqSmoother = SeqSSOR<M, V, V>;
                    using Smoother = Dune::BlockPreconditioner<V, V, C, SeqSmoother>;
                    using SmootherArgs = typename Dune::Amg::SmootherTraits<Smoother>::Arguments;
                    SmootherArgs sargs;
                    auto crit = AMGHelper<O, C, M, V>::criterion(prm);
                    PrecPtr prec = std::make_shared<Dune::Amg::AMGCPR<O, V, Smoother, C>>(op, crit, sargs, comm);
                    return prec;
                } else if (smoother == "ILUn") {
                    using SeqSmoother = SeqILU<M, V, V>;
                    using Smoother = Dune::BlockPreconditioner<V, V, C, SeqSmoother>;
                    using SmootherArgs = typename Dune::Amg::SmootherTraits<Smoother>::Arguments;
                    SmootherArgs sargs;
                    auto crit = AMGHelper<O, C, M, V>::criterion(prm);
                    PrecPtr prec = std::make_shared<Dune::Amg::AMGCPR<O, V, Smoother, C>>(op, crit, sargs, comm);
                    return prec;
                } else {
                    OPM_THROW(std::invalid_argument, "Properties: No smoother with name " + smoother + ".");
                }
            });
        }

        F::addCreator("cpr",
                      [](const O& op,
                         const P& prm,
                         const std::function<V()> weightsCalculator,
                         std::size_t pressureIndex,
                         const C& comm) {
                          assert(weightsCalculator);
                          if (pressureIndex == std::numeric_limits<std::size_t>::max()) {
                              OPM_THROW(std::logic_error,
                                        "Pressure index out of bounds. It needs to specified for CPR");
                          }
                          using Scalar = typename V::field_type;
                          using LevelTransferPolicy = PressureTransferPolicy<O, Comm, Scalar, false>;
                          return std::make_shared<OwningTwoLevelPreconditioner<O, V, LevelTransferPolicy, Comm>>(
                              op, prm, weightsCalculator, pressureIndex, comm);
                      });
        F::addCreator("cprt",
                      [](const O& op,
                         const P& prm,
                         const std::function<V()> weightsCalculator,
                         std::size_t pressureIndex,
                         const C& comm) {
                          assert(weightsCalculator);
                          if (pressureIndex == std::numeric_limits<std::size_t>::max()) {
                              OPM_THROW(std::logic_error,
                                        "Pressure index out of bounds. It needs to specified for CPR");
                          }
                          using Scalar = typename V::field_type;
                          using LevelTransferPolicy = PressureTransferPolicy<O, Comm, Scalar, true>;
                          return std::make_shared<OwningTwoLevelPreconditioner<O, V, LevelTransferPolicy, Comm>>(
                              op, prm, weightsCalculator, pressureIndex, comm);
                      });

        if constexpr (std::is_same_v<O, WellModelGhostLastMatrixAdapter<M, V, V, true>>) {
            F::addCreator("cprw",
                          [](const O& op,
                             const P& prm,
                             const std::function<V()> weightsCalculator,
                             std::size_t pressureIndex,
                             const C& comm) {
                              assert(weightsCalculator);
                              if (pressureIndex == std::numeric_limits<std::size_t>::max()) {
                                  OPM_THROW(std::logic_error,
                                            "Pressure index out of bounds. It needs to specified for CPR");
                              }
                              using Scalar = typename V::field_type;
                              using LevelTransferPolicy = PressureBhpTransferPolicy<O, Comm, Scalar, false>;
                              return std::make_shared<OwningTwoLevelPreconditioner<O, V, LevelTransferPolicy, Comm>>(
                                  op, prm, weightsCalculator, pressureIndex, comm);
                          });
        }

#if HAVE_CUDA
        F::addCreator("GPUILU0", [](const O& op, const P& prm, const std::function<V()>&, std::size_t, const C& comm) {
            const double w = prm.get<double>("relaxation", 1.0);
            using field_type = typename V::field_type;
            using GpuILU0 = typename gpuistl::
                GpuSeqILU0<M, gpuistl::GpuVector<field_type>, gpuistl::GpuVector<field_type>>;
            auto gpuILU0 = std::make_shared<GpuILU0>(op.getmat(), w);

            auto adapted = std::make_shared<gpuistl::PreconditionerAdapter<V, V, GpuILU0>>(gpuILU0);
            auto wrapped = std::make_shared<gpuistl::GpuBlockPreconditioner<V, V, Comm>>(adapted, comm);
            return wrapped;
        });

        F::addCreator("GPUJAC", [](const O& op, const P& prm, const std::function<V()>&, std::size_t, const C& comm) {
            const double w = prm.get<double>("relaxation", 1.0);
            using field_type = typename V::field_type;
            using GpuJac =
                typename gpuistl::GpuJac<M, gpuistl::GpuVector<field_type>, gpuistl::GpuVector<field_type>>;
            auto gpuJac = std::make_shared<GpuJac>(op.getmat(), w);

            auto adapted = std::make_shared<gpuistl::PreconditionerAdapter<V, V, GpuJac>>(gpuJac);
            auto wrapped = std::make_shared<gpuistl::GpuBlockPreconditioner<V, V, Comm>>(adapted, comm);
            return wrapped;
        });

        F::addCreator("GPUDILU", [](const O& op, [[maybe_unused]] const P& prm, const std::function<V()>&, std::size_t, const C& comm) {
            const bool split_matrix = prm.get<bool>("split_matrix", true);
            const bool tune_gpu_kernels = prm.get<bool>("tune_gpu_kernels", true);
            const int mixed_precision_scheme = prm.get<int>("mixed_precision_scheme", 0);
            using field_type = typename V::field_type;
            using GpuDILU = typename gpuistl::GpuDILU<M, gpuistl::GpuVector<field_type>, gpuistl::GpuVector<field_type>>;
            auto gpuDILU = std::make_shared<GpuDILU>(op.getmat(), split_matrix, tune_gpu_kernels, mixed_precision_scheme);

            auto adapted = std::make_shared<gpuistl::PreconditionerAdapter<V, V, GpuDILU>>(gpuDILU);
            auto wrapped = std::make_shared<gpuistl::GpuBlockPreconditioner<V, V, Comm>>(adapted, comm);
            return wrapped;
        });

        F::addCreator("OPMGPUILU0", [](const O& op, [[maybe_unused]] const P& prm, const std::function<V()>&, std::size_t, const C& comm) {
            const bool split_matrix = prm.get<bool>("split_matrix", true);
            const bool tune_gpu_kernels = prm.get<bool>("tune_gpu_kernels", true);
            const int mixed_precision_scheme = prm.get<int>("mixed_precision_scheme", 0);
            using field_type = typename V::field_type;
            using OpmGpuILU0 = typename gpuistl::OpmGpuILU0<M, gpuistl::GpuVector<field_type>, gpuistl::GpuVector<field_type>>;
            auto gpuilu0 = std::make_shared<OpmGpuILU0>(op.getmat(), split_matrix, tune_gpu_kernels, mixed_precision_scheme);

            auto adapted = std::make_shared<gpuistl::PreconditionerAdapter<V, V, OpmGpuILU0>>(gpuilu0);
            auto wrapped = std::make_shared<gpuistl::GpuBlockPreconditioner<V, V, Comm>>(adapted, comm);
            return wrapped;
        });
#endif
    }


    static typename PreconditionerFactory<Operator, Comm>::PrecPtr
    createParILU(const Operator& op, const PropertyTree& prm, const Comm& comm, const int ilulevel)
    {
        using F = PreconditionerFactory<Operator, Comm>;
        using M = typename F::Matrix;
        using V = typename F::Vector;

        const double w = prm.get<double>("relaxation", 1.0);
        const bool redblack = prm.get<bool>("redblack", false);
        const bool reorder_spheres = prm.get<bool>("reorder_spheres", false);
        // Already a parallel preconditioner. Need to pass comm, but no need to wrap it in a BlockPreconditioner.
        if (ilulevel == 0) {
            const std::size_t num_interior = interiorIfGhostLast(comm);
            assert(num_interior <= op.getmat().N());
            return std::make_shared<ParallelOverlappingILU0<M, V, V, Comm>>(
                op.getmat(), comm, w, MILU_VARIANT::ILU, num_interior, redblack, reorder_spheres);
        } else {
            return std::make_shared<ParallelOverlappingILU0<M, V, V, Comm>>(
                op.getmat(), comm, ilulevel, w, MILU_VARIANT::ILU, redblack, reorder_spheres);
        }
    }

    /// Helper method to determine if the local partitioning has the
    /// K interior cells from [0, K-1] and ghost cells from [K, N-1].
    /// Returns K if true, otherwise returns N. This is motivated by
    /// usage in the ParallelOverlappingILU0 preconditioner.
    static std::size_t interiorIfGhostLast(const Comm& comm)
    {
        std::size_t interior_count = 0;
        std::size_t highest_interior_index = 0;
        const auto& is = comm.indexSet();
        for (const auto& ind : is) {
            if (Comm::OwnerSet::contains(ind.local().attribute())) {
                ++interior_count;
                highest_interior_index = std::max(highest_interior_index, ind.local().local());
            }
        }
        if (highest_interior_index + 1 == interior_count) {
            return interior_count;
        } else {
            return is.size();
        }
    }
};

template <class Operator>
struct StandardPreconditioners<Operator, Dune::Amg::SequentialInformation> {
    static void add()
    {
        using namespace Dune;
        using O = Operator;
        using C = Dune::Amg::SequentialInformation;
        using F = PreconditionerFactory<O, C>;
        using M = typename F::Matrix;
        using V = typename F::Vector;
        using P = PropertyTree;
        F::addCreator("ILU0", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
            const double w = prm.get<double>("relaxation", 1.0);
            return std::make_shared<ParallelOverlappingILU0<M, V, V, C>>(
                op.getmat(), 0, w, MILU_VARIANT::ILU);
        });
        F::addCreator("DuneILU", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
            const double w = prm.get<double>("relaxation", 1.0);
            const int n = prm.get<int>("ilulevel", 0);
            const bool resort = prm.get<bool>("resort", false);
            return getRebuildOnUpdateWrapper<Dune::SeqILU<M, V, V>>(op.getmat(), n, w, resort);
        });
        F::addCreator("ParOverILU0", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
            const double w = prm.get<double>("relaxation", 1.0);
            const int n = prm.get<int>("ilulevel", 0);
            return std::make_shared<ParallelOverlappingILU0<M, V, V, C>>(
                op.getmat(), n, w, MILU_VARIANT::ILU);
        });
        F::addCreator("ILUn", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
            const int n = prm.get<int>("ilulevel", 0);
            const double w = prm.get<double>("relaxation", 1.0);
            return std::make_shared<ParallelOverlappingILU0<M, V, V, C>>(
                op.getmat(), n, w, MILU_VARIANT::ILU);
        });
        F::addCreator("DILU", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
            DUNE_UNUSED_PARAMETER(prm);
            return std::make_shared<MultithreadDILU<M, V, V>>(op.getmat());
        });
        F::addCreator("Jac", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
            const int n = prm.get<int>("repeats", 1);
            const double w = prm.get<double>("relaxation", 1.0);
            return getDummyUpdateWrapper<SeqJac<M, V, V>>(op.getmat(), n, w);
        });
        F::addCreator("GS", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
            const int n = prm.get<int>("repeats", 1);
            const double w = prm.get<double>("relaxation", 1.0);
            return getDummyUpdateWrapper<SeqGS<M, V, V>>(op.getmat(), n, w);
        });
        F::addCreator("SOR", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
            const int n = prm.get<int>("repeats", 1);
            const double w = prm.get<double>("relaxation", 1.0);
            return getDummyUpdateWrapper<SeqSOR<M, V, V>>(op.getmat(), n, w);
        });
        F::addCreator("SSOR", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
            const int n = prm.get<int>("repeats", 1);
            const double w = prm.get<double>("relaxation", 1.0);
            return getDummyUpdateWrapper<SeqSSOR<M, V, V>>(op.getmat(), n, w);
        });

        // Only add AMG preconditioners to the factory if the operator
        // is an actual matrix operator.
        if constexpr (std::is_same_v<O, Dune::MatrixAdapter<M, V, V>>) {
            F::addCreator("amg", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
                const std::string smoother = prm.get<std::string>("smoother", "ParOverILU0");
                if (smoother == "ILU0" || smoother == "ParOverILU0") {
                    using Smoother = SeqILU<M, V, V>;
                    return AMGHelper<O, C, M, V>::template makeAmgPreconditioner<Smoother>(op, prm);
                } else if (smoother == "Jac") {
                    using Smoother = SeqJac<M, V, V>;
                    return AMGHelper<O, C, M, V>::template makeAmgPreconditioner<Smoother>(op, prm);
                } else if (smoother == "GS") {
                    using Smoother = SeqGS<M, V, V>;
                    return AMGHelper<O, C, M, V>::template makeAmgPreconditioner<Smoother>(op, prm);
                } else if (smoother == "DILU") {
                    using Smoother = MultithreadDILU<M, V, V>;
                    return AMGHelper<O, C, M, V>::template makeAmgPreconditioner<Smoother>(op, prm);
                } else if (smoother == "SOR") {
                    using Smoother = SeqSOR<M, V, V>;
                    return AMGHelper<O, C, M, V>::template makeAmgPreconditioner<Smoother>(op, prm);
                } else if (smoother == "SSOR") {
                    using Smoother = SeqSSOR<M, V, V>;
                    return AMGHelper<O, C, M, V>::template makeAmgPreconditioner<Smoother>(op, prm);
                } else if (smoother == "ILUn") {
                    using Smoother = SeqILU<M, V, V>;
                    return AMGHelper<O, C, M, V>::template makeAmgPreconditioner<Smoother>(op, prm);
                } else {
                    OPM_THROW(std::invalid_argument, "Properties: No smoother with name " + smoother + ".");
                }
            });
            F::addCreator("kamg", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
                const std::string smoother = prm.get<std::string>("smoother", "ParOverILU0");
                if (smoother == "ILU0" || smoother == "ParOverILU0") {
                    using Smoother = SeqILU<M, V, V>;
                    return AMGHelper<O, C, M, V>::template makeAmgPreconditioner<Smoother>(op, prm, true);
                } else if (smoother == "Jac") {
                    using Smoother = SeqJac<M, V, V>;
                    return AMGHelper<O, C, M, V>::template makeAmgPreconditioner<Smoother>(op, prm, true);
                } else if (smoother == "SOR") {
                    using Smoother = SeqSOR<M, V, V>;
                    return AMGHelper<O, C, M, V>::template makeAmgPreconditioner<Smoother>(op, prm, true);
                } else if (smoother == "GS") {
                    using Smoother = SeqGS<M, V, V>;
                    return AMGHelper<O, C, M, V>::template makeAmgPreconditioner<Smoother>(op, prm, true);
                } else if (smoother == "SSOR") {
                    using Smoother = SeqSSOR<M, V, V>;
                    return AMGHelper<O, C, M, V>::template makeAmgPreconditioner<Smoother>(op, prm, true);
                } else if (smoother == "ILUn") {
                    using Smoother = SeqILU<M, V, V>;
                    return AMGHelper<O, C, M, V>::template makeAmgPreconditioner<Smoother>(op, prm, true);
                } else {
                    OPM_THROW(std::invalid_argument, "Properties: No smoother with name " + smoother + ".");
                }
            });
            F::addCreator("famg", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
                if  constexpr (std::is_same_v<typename V::field_type, float>) {
                    OPM_THROW(std::logic_error, "famg requires UMFPack which is not available for floats");
                    return nullptr;
                } else {
                    auto crit = AMGHelper<O, C, M, V>::criterion(prm);
                    Dune::Amg::Parameters parms;
                    parms.setNoPreSmoothSteps(1);
                    parms.setNoPostSmoothSteps(1);
                    return getRebuildOnUpdateWrapper<Dune::Amg::FastAMG<O, V>>(op, crit, parms);
                }
            });

#if HAVE_AMGX
            // Only add AMGX for scalar matrices
            if constexpr (M::block_type::rows == 1 && M::block_type::cols == 1) {
                F::addCreator("amgx", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
                    auto prm_copy = prm;
                    prm_copy.put("setup_frequency", Opm::Parameters::Get<Opm::Parameters::CprReuseInterval>());
                    return std::make_shared<Amgx::AmgxPreconditioner<M, V, V>>(op.getmat(), prm_copy);
                });
            }
#endif

#if HAVE_HYPRE
            // Only add Hypre for scalar matrices
            if constexpr (M::block_type::rows == 1 && M::block_type::cols == 1 &&
                          std::is_same_v<HYPRE_Real, typename V::field_type>) {
                F::addCreator("hypre", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
                    return std::make_shared<Hypre::HyprePreconditioner<M, V, V>>(op.getmat(), prm);
                });
            }
#endif
        }
        if constexpr (std::is_same_v<O, WellModelMatrixAdapter<M, V, V>>) {
            F::addCreator(
                "cprw",
                [](const O& op, const P& prm, const std::function<V()>& weightsCalculator, std::size_t pressureIndex) {
                    if (pressureIndex == std::numeric_limits<std::size_t>::max()) {
                        OPM_THROW(std::logic_error, "Pressure index out of bounds. It needs to specified for CPR");
                    }
                    using Scalar = typename V::field_type;
                    using LevelTransferPolicy
                        = PressureBhpTransferPolicy<O, Dune::Amg::SequentialInformation, Scalar, false>;
                    return std::make_shared<OwningTwoLevelPreconditioner<O, V, LevelTransferPolicy>>(
                        op, prm, weightsCalculator, pressureIndex);
                });
        }

        F::addCreator(
            "cpr",
            [](const O& op, const P& prm, const std::function<V()>& weightsCalculator, std::size_t pressureIndex) {
                if (pressureIndex == std::numeric_limits<std::size_t>::max()) {
                    OPM_THROW(std::logic_error, "Pressure index out of bounds. It needs to specified for CPR");
                }
                using Scalar = typename V::field_type;
                using LevelTransferPolicy = PressureTransferPolicy<O, Dune::Amg::SequentialInformation, Scalar, false>;
                return std::make_shared<OwningTwoLevelPreconditioner<O, V, LevelTransferPolicy>>(
                    op, prm, weightsCalculator, pressureIndex);
            });
        F::addCreator(
            "cprt",
            [](const O& op, const P& prm, const std::function<V()>& weightsCalculator, std::size_t pressureIndex) {
                if (pressureIndex == std::numeric_limits<std::size_t>::max()) {
                    OPM_THROW(std::logic_error, "Pressure index out of bounds. It needs to specified for CPR");
                }
                using Scalar = typename V::field_type;
                using LevelTransferPolicy = PressureTransferPolicy<O, Dune::Amg::SequentialInformation, Scalar, true>;
                return std::make_shared<OwningTwoLevelPreconditioner<O, V, LevelTransferPolicy>>(
                    op, prm, weightsCalculator, pressureIndex);
            });

#if HAVE_CUDA
        F::addCreator("GPUILU0", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
            const double w = prm.get<double>("relaxation", 1.0);
            using field_type = typename V::field_type;
            using GpuILU0 = typename gpuistl::
                GpuSeqILU0<M, gpuistl::GpuVector<field_type>, gpuistl::GpuVector<field_type>>;
            return std::make_shared<gpuistl::PreconditionerAdapter<V, V, GpuILU0>>(
                std::make_shared<GpuILU0>(op.getmat(), w));
        });

        F::addCreator("GPUILU0Float", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
            const double w = prm.get<double>("relaxation", 1.0);
            using block_type = typename V::block_type;
            using VTo = Dune::BlockVector<Dune::FieldVector<float, block_type::dimension>>;
            using matrix_type_to =
                typename Dune::BCRSMatrix<Dune::FieldMatrix<float, block_type::dimension, block_type::dimension>>;
            using GpuILU0 = typename gpuistl::
                GpuSeqILU0<matrix_type_to, gpuistl::GpuVector<float>, gpuistl::GpuVector<float>>;
            using Adapter = typename gpuistl::PreconditionerAdapter<VTo, VTo, GpuILU0>;
            using Converter = typename gpuistl::PreconditionerConvertFieldTypeAdapter<Adapter, M, V, V>;
            auto converted = std::make_shared<Converter>(op.getmat());
            auto adapted = std::make_shared<Adapter>(std::make_shared<GpuILU0>(converted->getConvertedMatrix(), w));
            converted->setUnderlyingPreconditioner(adapted);
            return converted;
        });

        F::addCreator("GPUJAC", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
            const double w = prm.get<double>("relaxation", 1.0);
            using field_type = typename V::field_type;
            using GPUJac =
                typename gpuistl::GpuJac<M, gpuistl::GpuVector<field_type>, gpuistl::GpuVector<field_type>>;
            return std::make_shared<gpuistl::PreconditionerAdapter<V, V, GPUJac>>(
                std::make_shared<GPUJac>(op.getmat(), w));
        });

        F::addCreator("OPMGPUILU0", [](const O& op, [[maybe_unused]] const P& prm, const std::function<V()>&, std::size_t) {
            const bool split_matrix = prm.get<bool>("split_matrix", true);
            const bool tune_gpu_kernels = prm.get<bool>("tune_gpu_kernels", true);
            const int mixed_precision_scheme = prm.get<int>("mixed_precision_scheme", 0);

            using field_type = typename V::field_type;
            using GPUILU0 = typename gpuistl::OpmGpuILU0<M, gpuistl::GpuVector<field_type>, gpuistl::GpuVector<field_type>>;

            return std::make_shared<gpuistl::PreconditionerAdapter<V, V, GPUILU0>>(std::make_shared<GPUILU0>(op.getmat(), split_matrix, tune_gpu_kernels, mixed_precision_scheme));
        });

        F::addCreator("GPUDILU", [](const O& op, [[maybe_unused]] const P& prm, const std::function<V()>&, std::size_t) {
            const bool split_matrix = prm.get<bool>("split_matrix", true);
            const bool tune_gpu_kernels = prm.get<bool>("tune_gpu_kernels", true);
            const int mixed_precision_scheme = prm.get<int>("mixed_precision_scheme", 0);
            using field_type = typename V::field_type;
            using GPUDILU = typename gpuistl::GpuDILU<M, gpuistl::GpuVector<field_type>, gpuistl::GpuVector<field_type>>;
            return std::make_shared<gpuistl::PreconditionerAdapter<V, V, GPUDILU>>(std::make_shared<GPUDILU>(op.getmat(), split_matrix, tune_gpu_kernels, mixed_precision_scheme));
        });

        F::addCreator("GPUDILUFloat", [](const O& op, [[maybe_unused]] const P& prm, const std::function<V()>&, std::size_t) {
            const bool split_matrix = prm.get<bool>("split_matrix", true);
            const bool tune_gpu_kernels = prm.get<bool>("tune_gpu_kernels", true);
            const int mixed_precision_scheme = prm.get<int>("mixed_precision_scheme", 0);

            using block_type = typename V::block_type;
            using VTo = Dune::BlockVector<Dune::FieldVector<float, block_type::dimension>>;
            using matrix_type_to = typename Dune::BCRSMatrix<Dune::FieldMatrix<float, block_type::dimension, block_type::dimension>>;
            using GpuDILU = typename gpuistl::GpuDILU<matrix_type_to, gpuistl::GpuVector<float>, gpuistl::GpuVector<float>>;
            using Adapter = typename gpuistl::PreconditionerAdapter<VTo, VTo, GpuDILU>;
            using Converter = typename gpuistl::PreconditionerConvertFieldTypeAdapter<Adapter, M, V, V>;
            auto converted = std::make_shared<Converter>(op.getmat());
            auto adapted = std::make_shared<Adapter>(std::make_shared<GpuDILU>(converted->getConvertedMatrix(), split_matrix, tune_gpu_kernels, mixed_precision_scheme));
            converted->setUnderlyingPreconditioner(adapted);
            return converted;
        });
#endif
    }
};

template <class Operator, class Comm>
PreconditionerFactory<Operator, Comm>::PreconditionerFactory()
{
}


template <class Operator, class Comm>
PreconditionerFactory<Operator, Comm>&
PreconditionerFactory<Operator, Comm>::instance()
{
    static PreconditionerFactory singleton;
    return singleton;
}

template <class Operator, class Comm>
typename PreconditionerFactory<Operator, Comm>::PrecPtr
PreconditionerFactory<Operator, Comm>::doCreate(const Operator& op,
                                                const PropertyTree& prm,
                                                const std::function<Vector()> weightsCalculator,
                                                std::size_t pressureIndex)
{
    if (!defAdded_) {
        StandardPreconditioners<Operator, Comm>::add();
        defAdded_ = true;
    }
    const std::string& type = prm.get<std::string>("type", "ParOverILU0");
    auto it = creators_.find(type);
    if (it == creators_.end()) {
        std::ostringstream msg;
        msg << "Preconditioner type " << type << " is not registered in the factory. Available types are: ";
        for (const auto& prec : creators_) {
            msg << prec.first << ' ';
        }
        msg << std::endl;
        OPM_THROW(std::invalid_argument, msg.str());
    }
    return it->second(op, prm, weightsCalculator, pressureIndex);
}

template <class Operator, class Comm>
typename PreconditionerFactory<Operator, Comm>::PrecPtr
PreconditionerFactory<Operator, Comm>::doCreate(const Operator& op,
                                                const PropertyTree& prm,
                                                const std::function<Vector()> weightsCalculator,
                                                std::size_t pressureIndex,
                                                const Comm& comm)
{
    if (!defAdded_) {
        StandardPreconditioners<Operator, Comm>::add();
        defAdded_ = true;
    }
    const std::string& type = prm.get<std::string>("type", "ParOverILU0");
    auto it = parallel_creators_.find(type);
    if (it == parallel_creators_.end()) {
        std::ostringstream msg;
        msg << "Parallel preconditioner type " << type << " is not registered in the factory. Available types are: ";
        for (const auto& prec : parallel_creators_) {
            msg << prec.first << ' ';
        }
        msg << std::endl;
        OPM_THROW(std::invalid_argument, msg.str());
    }
    return it->second(op, prm, weightsCalculator, pressureIndex, comm);
}

template <class Operator, class Comm>
void
PreconditionerFactory<Operator, Comm>::doAddCreator(const std::string& type, Creator c)
{
    creators_[type] = c;
}

template <class Operator, class Comm>
void
PreconditionerFactory<Operator, Comm>::doAddCreator(const std::string& type, ParCreator c)
{
    parallel_creators_[type] = c;
}

template <class Operator, class Comm>
typename PreconditionerFactory<Operator, Comm>::PrecPtr
PreconditionerFactory<Operator, Comm>::create(const Operator& op,
                                              const PropertyTree& prm,
                                              const std::function<Vector()>& weightsCalculator,
                                              std::size_t pressureIndex)
{
    return instance().doCreate(op, prm, weightsCalculator, pressureIndex);
}

template <class Operator, class Comm>
typename PreconditionerFactory<Operator, Comm>::PrecPtr
PreconditionerFactory<Operator, Comm>::create(const Operator& op,
                                              const PropertyTree& prm,
                                              const std::function<Vector()>& weightsCalculator,
                                              const Comm& comm,
                                              std::size_t pressureIndex)
{
    return instance().doCreate(op, prm, weightsCalculator, pressureIndex, comm);
}


template <class Operator, class Comm>
typename PreconditionerFactory<Operator, Comm>::PrecPtr
PreconditionerFactory<Operator, Comm>::create(const Operator& op,
                                              const PropertyTree& prm,
                                              const Comm& comm,
                                              std::size_t pressureIndex)
{
    return instance().doCreate(op, prm, std::function<Vector()>(), pressureIndex, comm);
}

template <class Operator, class Comm>
void
PreconditionerFactory<Operator, Comm>::addCreator(const std::string& type, Creator creator)
{
    instance().doAddCreator(type, creator);
}

template <class Operator, class Comm>
void
PreconditionerFactory<Operator, Comm>::addCreator(const std::string& type, ParCreator creator)
{
    instance().doAddCreator(type, creator);
}

using CommSeq = Dune::Amg::SequentialInformation;

template<class Scalar, int Dim>
using OpFSeq = Dune::MatrixAdapter<Dune::BCRSMatrix<Dune::FieldMatrix<Scalar, Dim, Dim>>,
                                   Dune::BlockVector<Dune::FieldVector<Scalar, Dim>>,
                                   Dune::BlockVector<Dune::FieldVector<Scalar, Dim>>>;
template<class Scalar, int Dim>
using OpBSeq = Dune::MatrixAdapter<Dune::BCRSMatrix<MatrixBlock<Scalar, Dim, Dim>>,
                                   Dune::BlockVector<Dune::FieldVector<Scalar, Dim>>,
                                   Dune::BlockVector<Dune::FieldVector<Scalar, Dim>>>;

template<class Scalar, int Dim, bool overlap>
using OpW = WellModelMatrixAdapter<Dune::BCRSMatrix<MatrixBlock<Scalar, Dim, Dim>>,
                                   Dune::BlockVector<Dune::FieldVector<Scalar, Dim>>,
                                   Dune::BlockVector<Dune::FieldVector<Scalar, Dim>>>;

template<class Scalar, int Dim, bool overlap>
using OpWG = WellModelGhostLastMatrixAdapter<Dune::BCRSMatrix<MatrixBlock<Scalar, Dim, Dim>>,
                                             Dune::BlockVector<Dune::FieldVector<Scalar, Dim>>,
                                             Dune::BlockVector<Dune::FieldVector<Scalar, Dim>>,
                                             overlap>;

#if HAVE_MPI
using CommPar = Dune::OwnerOverlapCopyCommunication<int, int>;

template<class Scalar, int Dim>
using OpFPar = Dune::OverlappingSchwarzOperator<Dune::BCRSMatrix<Dune::FieldMatrix<Scalar, Dim, Dim>>,
                                                Dune::BlockVector<Dune::FieldVector<Scalar, Dim>>,
                                                Dune::BlockVector<Dune::FieldVector<Scalar, Dim>>,
                                                CommPar>;

template<class Scalar, int Dim>
using OpBPar = Dune::OverlappingSchwarzOperator<Dune::BCRSMatrix<MatrixBlock<Scalar, Dim, Dim>>,
                                                Dune::BlockVector<Dune::FieldVector<Scalar, Dim>>,
                                                Dune::BlockVector<Dune::FieldVector<Scalar, Dim>>,
                                                CommPar>;
template<class Scalar, int Dim>
using OpGLFPar = Opm::GhostLastMatrixAdapter<Dune::BCRSMatrix<Dune::FieldMatrix<Scalar,Dim,Dim>>,
                                             Dune::BlockVector<Dune::FieldVector<Scalar,Dim>>,
                                             Dune::BlockVector<Dune::FieldVector<Scalar,Dim>>,
                                             CommPar>;

template<class Scalar, int Dim>
using OpGLBPar = Opm::GhostLastMatrixAdapter<Dune::BCRSMatrix<MatrixBlock<Scalar,Dim,Dim>>,
                                             Dune::BlockVector<Dune::FieldVector<Scalar,Dim>>,
                                             Dune::BlockVector<Dune::FieldVector<Scalar,Dim>>,
                                             CommPar>;

#define INSTANTIATE_PF_PAR(T,Dim)                                     \
    template class PreconditionerFactory<OpBSeq<T,Dim>, CommPar>;     \
    template class PreconditionerFactory<OpFPar<T,Dim>, CommPar>;     \
    template class PreconditionerFactory<OpBPar<T,Dim>, CommPar>;     \
    template class PreconditionerFactory<OpGLFPar<T,Dim>, CommPar>;   \
    template class PreconditionerFactory<OpGLBPar<T,Dim>, CommPar>;   \
    template class PreconditionerFactory<OpW<T,Dim, false>, CommPar>; \
    template class PreconditionerFactory<OpWG<T,Dim, true>, CommPar>; \
    template class PreconditionerFactory<OpBPar<T,Dim>, CommSeq>;     \
    template class PreconditionerFactory<OpGLBPar<T,Dim>, CommSeq>;
#endif

#define INSTANTIATE_PF_SEQ(T,Dim)                                     \
    template class PreconditionerFactory<OpFSeq<T,Dim>, CommSeq>;     \
    template class PreconditionerFactory<OpBSeq<T,Dim>, CommSeq>;     \
    template class PreconditionerFactory<OpW<T,Dim, false>, CommSeq>; \
    template class PreconditionerFactory<OpWG<T,Dim, true>, CommSeq>;

#if HAVE_MPI
#define INSTANTIATE_PF(T,Dim) \
    INSTANTIATE_PF_PAR(T,Dim) \
    INSTANTIATE_PF_SEQ(T,Dim)
#else
#define INSTANTIATE_PF(T,Dim) INSTANTIATE_PF_SEQ(T,Dim)
#endif

} // namespace Opm
