/*******************************************************************************
 *
 * MIT License
 *
 * Copyright (c) 2020 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
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 * furnished to do so, subject to the following conditions:
 *
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 *
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 *******************************************************************************/
#ifndef CK_REDUCTION_FUNCTIONS_BINOP_HPP
#define CK_REDUCTION_FUNCTIONS_BINOP_HPP

#include "data_type.hpp"

#include "reduction_common.hpp"
#include "reduction_operator.hpp"

namespace ck {
namespace detail {

static inline __device__ bool isnan(half_t x) { return ::isnan(static_cast<float>(x)); };

template <NanPropagation_t nanPropaOpt, typename opReduce, typename compType>
struct binop_with_nan_check;

template <typename opReduce, typename compType>
struct binop_with_nan_check<NanPropagation_t::NOT_PROPAGATE_NAN, opReduce, compType>
{
    // cppcheck-suppress constParameter
    __device__ static inline void calculate(compType& accuVal, compType currVal)
    {
        opReduce{}(accuVal, currVal);
    };

    // The method is called when the opReduce is indexable and the user asked for indices
    __device__ static inline void
    // cppcheck-suppress constParameter
    calculate(compType& accuVal, compType currVal, int& accuIndex, int currIndex)
    {
        bool changed = false;

        opReduce{}(accuVal, currVal, changed);

        if(changed)
            accuIndex = currIndex;
    };
};

template <typename opReduce, typename compType>
struct binop_with_nan_check<NanPropagation_t::PROPAGATE_NAN, opReduce, compType>
{
    __device__ static inline void calculate(compType& accuVal, compType currVal)
    {
        if(isnan(currVal))
            accuVal = currVal;
        else
            opReduce{}(accuVal, currVal);
    };

    // The method is called when the opReduce is indexable and the user asked for indices
    __device__ static inline void
    calculate(compType& accuVal, compType currVal, int& accuIndex, int currIndex)
    {
        if(isnan(currVal))
        {
            accuVal   = currVal;
            accuIndex = currIndex;
        }
        else
        {
            bool changed = false;

            opReduce{}(accuVal, currVal, changed);

            if(changed)
                accuIndex = currIndex;
        }
    };
};

}; // namespace detail
}; // end of namespace ck

#endif
