/* ************************************************************************
 * Copyright (c) 2018-2021 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * ************************************************************************ */

#ifndef ROCALUTION_SMOOTHED_AMG_HPP_
#define ROCALUTION_SMOOTHED_AMG_HPP_

#include "../solver.hpp"
#include "base_amg.hpp"
#include "export.hpp"

#include <vector>

namespace rocalution
{

    /** \ingroup solver_module
  * \class SAAMG
  * \brief Smoothed Aggregation Algebraic MultiGrid Method
  * \details
  * The Smoothed Aggregation Algebraic MultiGrid method is based on smoothed
  * aggregation based interpolation scheme.
  * \cite vanek
  *
  * \tparam OperatorType - can be LocalMatrix
  * \tparam VectorType - can be LocalVector
  * \tparam ValueType - can be float, double, std::complex<float> or std::complex<double>
  */
    template <class OperatorType, class VectorType, typename ValueType>
    class SAAMG : public BaseAMG<OperatorType, VectorType, ValueType>
    {
    public:
        ROCALUTION_EXPORT
        SAAMG();
        ROCALUTION_EXPORT
        virtual ~SAAMG();

        ROCALUTION_EXPORT
        virtual void Print(void) const;

        /** \brief Set coupling strength */
        ROCALUTION_EXPORT
        void SetCouplingStrength(ValueType eps);
        /** \brief Set the relaxation parameter */
        ROCALUTION_EXPORT
        void SetInterpRelax(ValueType relax);

        ROCALUTION_EXPORT
        virtual void ReBuildNumeric(void);

    protected:
        virtual void Aggregate_(const OperatorType&  op,
                                Operator<ValueType>* pro,
                                Operator<ValueType>* res,
                                OperatorType*        coarse,
                                ParallelManager*     pm,
                                LocalVector<int>*    trans);

        virtual void PrintStart_(void) const;
        virtual void PrintEnd_(void) const;

    private:
        /** \brief Coupling strength */
        ValueType eps_;

        /** \brief Relaxation parameter */
        ValueType relax_;
    };

} // namespace rocalution

#endif // ROCALUTION_SMOOTHED_AMG_HPP_