/*
  Copyright 2010, 2011, 2012 SINTEF ICT, Applied Mathematics.

  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/>.
*/

#ifndef OPM_SATURATIONPROPSFROMDECK_HEADER_INCLUDED
#define OPM_SATURATIONPROPSFROMDECK_HEADER_INCLUDED

#include <opm/core/props/satfunc/SaturationPropsInterface.hpp>
#include <opm/core/utility/parameters/ParameterGroup.hpp>
#include <opm/core/io/eclipse/EclipseGridParser.hpp>
#include <opm/core/props/BlackoilPhases.hpp>
#include <opm/core/props/satfunc/SatFuncStone2.hpp>
#include <opm/core/props/satfunc/SatFuncSimple.hpp>
#include <opm/core/props/satfunc/SatFuncGwseg.hpp>
#include <vector>

struct UnstructuredGrid;

namespace Opm
{



    /// Interface to saturation functions from deck.
    /// Possible values for template argument (for now):
    ///   SatFuncSetStone2Nonuniform,
    ///   SatFuncSetStone2Uniform.
    ///   SatFuncSetSimpleNonuniform,
    ///   SatFuncSetSimpleUniform.
    template <class SatFuncSet>
    class SaturationPropsFromDeck : public SaturationPropsInterface
    {
    public:
        /// Default constructor.
        SaturationPropsFromDeck();

        /// Initialize from deck and grid.
        /// \param[in]  deck     Deck input parser
        /// \param[in]  grid     Grid to which property object applies, needed for the
        ///                      mapping from cell indices (typically from a processed grid)
        ///                      to logical cartesian indices consistent with the deck.
        /// \param[in]  samples  Number of uniform sample points for saturation tables.
        /// NOTE: samples will only be used with the SatFuncSetUniform template argument.
        void init(const EclipseGridParser& deck,
                  const UnstructuredGrid& grid,
                  const int samples);

        /// Initialize from deck and grid.
        /// \param[in]  deck            Deck input parser
        /// \param[in]  number_of_cells The number of cells of the grid to which property
        ///                             object applies, needed for the
        ///                             mapping from cell indices (typically from a processed
        ///                             grid) to logical cartesian indices consistent with the
        ///                             deck.
        /// \param[in]  global_cell     The mapping from local cell indices of the grid to
        ///                             global cell indices used in the deck.
        /// \param[in]  begin_cell_centroids Pointer to the first cell_centroid of the grid.
        /// \param[in]  dimensions      The dimensions of the grid. 
        /// \param[in]  samples         Number of uniform sample points for saturation tables.
        /// \tparam     T               The iterator Type for the cell centroids.
        /// NOTE: samples will only be used with the SatFuncSetUniform template argument.
        template<class T>
        void init(const EclipseGridParser& deck,
                  int number_of_cells,
                  const int* global_cell,
                  const T& begin_cell_centroids,
                  int dimensions,
                  const int samples);
        
        /// \return   P, the number of phases.
        int numPhases() const;

        /// Relative permeability.
        /// \param[in]  n      Number of data points.
        /// \param[in]  s      Array of nP saturation values.
        /// \param[out] kr     Array of nP relperm values, array must be valid before calling.
        /// \param[out] dkrds  If non-null: array of nP^2 relperm derivative values,
        ///                    array must be valid before calling.
        ///                    The P^2 derivative matrix is
        ///                           m_{ij} = \frac{dkr_i}{ds^j},
        ///                    and is output in Fortran order (m_00 m_10 m_20 m01 ...)
        void relperm(const int n,
                     const double* s,
                     const int* cells,
                     double* kr,
                     double* dkrds) const;

        /// Capillary pressure.
        /// \param[in]  n      Number of data points.
        /// \param[in]  s      Array of nP saturation values.
        /// \param[out] pc     Array of nP capillary pressure values, array must be valid before calling.
        /// \param[out] dpcds  If non-null: array of nP^2 derivative values,
        ///                    array must be valid before calling.
        ///                    The P^2 derivative matrix is
        ///                           m_{ij} = \frac{dpc_i}{ds^j},
        ///                    and is output in Fortran order (m_00 m_10 m_20 m01 ...)
        void capPress(const int n,
                      const double* s,
                      const int* cells,
                      double* pc,
                      double* dpcds) const;

        /// Obtain the range of allowable saturation values.
        /// \param[in]  n      Number of data points.
        /// \param[out] smin   Array of nP minimum s values, array must be valid before calling.
        /// \param[out] smax   Array of nP maximum s values, array must be valid before calling.
        void satRange(const int n,
                      const int* cells,
                      double* smin,
                      double* smax) const;

    private:
        PhaseUsage phase_usage_;
        std::vector<SatFuncSet> satfuncset_;
        std::vector<int> cell_to_func_; // = SATNUM - 1

        struct { // End point scaling parameters
            std::vector<double> swl_;
            std::vector<double> swcr_;
            std::vector<double> swu_;
            std::vector<double> sowcr_;
            std::vector<double> krw_;
            std::vector<double> krwr_;
            std::vector<double> kro_;
            std::vector<double> krorw_;
        } eps_;
        bool do_eps_;  // ENDSCALE is active
        bool do_3pt_;  // SCALECRS: YES~true  NO~false

        typedef SatFuncSet Funcs;

        const Funcs& funcForCell(const int cell) const;
        template<class T>
        void initEPS(const EclipseGridParser& deck,
                     int number_of_cells,
                     const int* global_cell,
                     const T& begin_cell_centroids,
                     int dimensions,
                     const std::string& keyword,
                     std::vector<double>& scaleparam);
        void relpermEPS(const double *s, const int cell, double *kr, double *dkrds= 0) const;
    };



} // namespace Opm


#include <opm/core/props/satfunc/SaturationPropsFromDeck_impl.hpp>


#endif // OPM_SATURATIONPROPSFROMDECK_HEADER_INCLUDED