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 * Copyright (c) 2018-2021 Advanced Micro Devices, Inc.
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 * 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.
 *
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 * 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
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#ifndef ROCALUTION_GLOBAL_VECTOR_HPP_
#define ROCALUTION_GLOBAL_VECTOR_HPP_

#include "../utils/types.hpp"
#include "parallel_manager.hpp"
#include "vector.hpp"

namespace rocalution
{

    template <typename ValueType>
    class LocalVector;
    template <typename ValueType>
    class LocalMatrix;
    template <typename ValueType>
    class GlobalMatrix;
    struct MRequest;

    /** \ingroup op_vec_module
  * \class GlobalVector
  * \brief GlobalVector class
  * \details
  * A GlobalVector is called global, because it can stay on a single or on multiple nodes
  * in a network. For this type of communication, MPI is used.
  *
  * \tparam ValueType - can be int, float, double, std::complex<float> and
  *                     std::complex<double>
  */
    template <typename ValueType>
    class GlobalVector : public Vector<ValueType>
    {
    public:
        GlobalVector();
        /** \brief Initialize a global vector with a parallel manager */
        explicit GlobalVector(const ParallelManager& pm);
        virtual ~GlobalVector();

        virtual void MoveToAccelerator(void);
        virtual void MoveToHost(void);

        virtual void Info(void) const;
        virtual bool Check(void) const;

        virtual IndexType2 GetSize(void) const;
        virtual int        GetLocalSize(void) const;
        virtual int        GetGhostSize(void) const;

        /** \private */
        const LocalVector<ValueType>& GetInterior() const;
        /** \private */
        LocalVector<ValueType>& GetInterior();
        /** \private */
        const LocalVector<ValueType>& GetGhost() const;

        /** \brief Allocate a global vector with name and size */
        virtual void Allocate(std::string name, IndexType2 size);
        virtual void Clear(void);

        /** \brief Set the parallel manager of a global vector */
        void SetParallelManager(const ParallelManager& pm);

        virtual void Zeros(void);
        virtual void Ones(void);
        virtual void SetValues(ValueType val);
        virtual void SetRandomUniform(unsigned long long seed,
                                      ValueType          a = static_cast<ValueType>(-1),
                                      ValueType          b = static_cast<ValueType>(1));
        virtual void SetRandomNormal(unsigned long long seed,
                                     ValueType          mean = static_cast<ValueType>(0),
                                     ValueType          var  = static_cast<ValueType>(1));
        void         CloneFrom(const GlobalVector<ValueType>& src);

        /** \brief Access operator (only for host data) */
        ValueType& operator[](int i);
        /** \brief Access operator (only for host data) */
        const ValueType& operator[](int i) const;

        /** \brief Initialize the local part of a global vector with externally allocated
      * data
      */
        void SetDataPtr(ValueType** ptr, std::string name, IndexType2 size);
        /** \brief Get a pointer to the data from the local part of a global vector and free
      * the global vector object
      */
        void LeaveDataPtr(ValueType** ptr);

        virtual void CopyFrom(const GlobalVector<ValueType>& src);
        virtual void ReadFileASCII(const std::string& filename);
        virtual void WriteFileASCII(const std::string& filename) const;
        virtual void ReadFileBinary(const std::string& filename);
        virtual void WriteFileBinary(const std::string& filename) const;

        virtual void AddScale(const GlobalVector<ValueType>& x, ValueType alpha);
        virtual void ScaleAdd(ValueType alpha, const GlobalVector<ValueType>& x);
        virtual void ScaleAdd2(ValueType                      alpha,
                               const GlobalVector<ValueType>& x,
                               ValueType                      beta,
                               const GlobalVector<ValueType>& y,
                               ValueType                      gamma);
        virtual void
            ScaleAddScale(ValueType alpha, const GlobalVector<ValueType>& x, ValueType beta);
        virtual void      Scale(ValueType alpha);
        virtual ValueType Dot(const GlobalVector<ValueType>& x) const;
        virtual ValueType DotNonConj(const GlobalVector<ValueType>& x) const;
        virtual ValueType Norm(void) const;
        virtual ValueType Reduce(void) const;
        virtual ValueType Asum(void) const;
        virtual int       Amax(ValueType& value) const;
        virtual void      PointWiseMult(const GlobalVector<ValueType>& x);
        virtual void      PointWiseMult(const GlobalVector<ValueType>& x,
                                        const GlobalVector<ValueType>& y);

        virtual void Power(double power);

        /** \brief Restriction operator based on restriction mapping vector */
        void Restriction(const GlobalVector<ValueType>& vec_fine, const LocalVector<int>& map);

        /** \brief Prolongation operator based on restriction mapping vector */
        void Prolongation(const GlobalVector<ValueType>& vec_coarse, const LocalVector<int>& map);

    protected:
        virtual bool is_host_(void) const;
        virtual bool is_accel_(void) const;

        /** \brief Update ghost values asynchronously */
        void UpdateGhostValuesAsync_(const GlobalVector<ValueType>& in);
        /** \brief Update ghost values synchronously */
        void UpdateGhostValuesSync_(void);

    private:
        MRequest* recv_event_;
        MRequest* send_event_;

        ValueType* recv_boundary_;
        ValueType* send_boundary_;

        LocalVector<ValueType> vector_interior_;
        LocalVector<ValueType> vector_ghost_;

        friend class LocalMatrix<ValueType>;
        friend class GlobalMatrix<ValueType>;

        friend class BaseRocalution<ValueType>;
    };

} // namespace rocalution

#endif // ROCALUTION_GLOBAL_VECTOR_HPP_