/**
 * \file
 * \copyright
 * Copyright (c) 2012-2021, OpenGeoSys Community (http://www.opengeosys.org)
 *            Distributed under a Modified BSD License.
 *              See accompanying file LICENSE.txt or
 *              http://www.opengeosys.org/project/license
 *
 */

#pragma once

#include <memory>
#include <vector>

#include "IntegrationPointData.h"
#include "LocalAssemblerInterface.h"
#include "MaterialLib/SolidModels/LinearElasticIsotropic.h"
#include "NumLib/DOF/DOFTableUtil.h"
#include "NumLib/Fem/InitShapeMatrices.h"
#include "NumLib/Fem/ShapeMatrixPolicy.h"
#include "ParameterLib/Parameter.h"
#include "ProcessLib/Deformation/BMatrixPolicy.h"
#include "ProcessLib/Deformation/LinearBMatrix.h"
#include "ProcessLib/LocalAssemblerTraits.h"
#include "ThermoRichardsFlowProcessData.h"

namespace ProcessLib
{
namespace ThermoRichardsFlow
{
namespace MPL = MaterialPropertyLib;

template <typename ShapeFunction, typename IntegrationMethod, int GlobalDim>
class ThermoRichardsFlowLocalAssembler : public LocalAssemblerInterface
{
public:
    // Note: temperature variable uses the same shape functions as that are used
    // by pressure variable.
    using ShapeMatricesType = ShapeMatrixPolicyType<ShapeFunction, GlobalDim>;

    using GlobalDimMatrixType = typename ShapeMatricesType::GlobalDimMatrixType;
    using GlobalDimVectorType = typename ShapeMatricesType::GlobalDimVectorType;

    using IpData = IntegrationPointData<ShapeMatricesType>;

    ThermoRichardsFlowLocalAssembler(ThermoRichardsFlowLocalAssembler const&) =
        delete;
    ThermoRichardsFlowLocalAssembler(ThermoRichardsFlowLocalAssembler&&) =
        delete;

    ThermoRichardsFlowLocalAssembler(
        MeshLib::Element const& e,
        std::size_t const /*local_matrix_size*/,
        bool const is_axially_symmetric,
        unsigned const integration_order,
        ThermoRichardsFlowProcessData& process_data);

    /// \return the number of read integration points.
    std::size_t setIPDataInitialConditions(
        std::string const& name,
        double const* values,
        int const integration_order) override;

    void setInitialConditionsConcrete(std::vector<double> const& local_x,
                                      double const t,
                                      bool const /*use_monolithic_scheme*/,
                                      int const /*process_id*/) override;

    void assembleWithJacobian(double const t, double const dt,
                              std::vector<double> const& local_x,
                              std::vector<double> const& local_xdot,
                              const double /*dxdot_dx*/, const double /*dx_dx*/,
                              std::vector<double>& /*local_M_data*/,
                              std::vector<double>& /*local_K_data*/,
                              std::vector<double>& local_rhs_data,
                              std::vector<double>& local_Jac_data) override;

    void assemble(double const t, double const dt,
                              std::vector<double> const& local_x,
                              std::vector<double> const& local_xdot,
                              std::vector<double>& local_M_data,
                              std::vector<double>& local_K_data,
                              std::vector<double>& local_rhs_data) override;

    void initializeConcrete() override
    {
        unsigned const n_integration_points =
            _integration_method.getNumberOfPoints();

        for (unsigned ip = 0; ip < n_integration_points; ip++)
        {
            auto& ip_data = _ip_data[ip];
            ip_data.pushBackState();
        }
    }

    void postTimestepConcrete(Eigen::VectorXd const& /*local_x*/,
                              double const /*t*/,
                              double const /*dt*/) override
    {
        unsigned const n_integration_points =
            _integration_method.getNumberOfPoints();

        for (unsigned ip = 0; ip < n_integration_points; ip++)
        {
            _ip_data[ip].pushBackState();
        }
    }

    void computeSecondaryVariableConcrete(
        double const t, double const dt, Eigen::VectorXd const& local_x,
        Eigen::VectorXd const& local_x_dot) override;

    Eigen::Map<const Eigen::RowVectorXd> getShapeMatrix(
        const unsigned integration_point) const override
    {
        auto const& N = _ip_data[integration_point].N;

        // assumes N is stored contiguously in memory
        return Eigen::Map<const Eigen::RowVectorXd>(N.data(), N.size());
    }

    std::vector<double> const& getIntPtDarcyVelocity(
        const double t,
        std::vector<GlobalVector*> const& x,
        std::vector<NumLib::LocalToGlobalIndexMap const*> const& dof_table,
        std::vector<double>& cache) const override;

    std::vector<double> getSaturation() const override;
    std::vector<double> const& getIntPtSaturation(
        const double t,
        std::vector<GlobalVector*> const& x,
        std::vector<NumLib::LocalToGlobalIndexMap const*> const& dof_table,
        std::vector<double>& cache) const override;

    std::vector<double> getPorosity() const override;
    std::vector<double> const& getIntPtPorosity(
        const double t,
        std::vector<GlobalVector*> const& x,
        std::vector<NumLib::LocalToGlobalIndexMap const*> const& dof_table,
        std::vector<double>& cache) const override;

    std::vector<double> const& getIntPtDryDensitySolid(
        const double t,
        std::vector<GlobalVector*> const& x,
        std::vector<NumLib::LocalToGlobalIndexMap const*> const& dof_table,
        std::vector<double>& cache) const override;

private:
    unsigned getNumberOfIntegrationPoints() const override;

private:
    ThermoRichardsFlowProcessData& _process_data;

    std::vector<IpData, Eigen::aligned_allocator<IpData>> _ip_data;

    IntegrationMethod _integration_method;
    MeshLib::Element const& _element;
    bool const _is_axially_symmetric;

    static const int temperature_index = 0;
    static const int temperature_size = ShapeFunction::NPOINTS;
    static const int pressure_index = temperature_size;
    static const int pressure_size = ShapeFunction::NPOINTS;
};

}  // namespace ThermoRichardsFlow
}  // namespace ProcessLib

#include "ThermoRichardsFlowFEM-impl.h"