/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2015-2022 Advanced Micro Devices, Inc. All rights reserved.
 *
 * 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 MIGRAPHX_GUARD_KERNELS_INDEX_HPP
#define MIGRAPHX_GUARD_KERNELS_INDEX_HPP

#include <migraphx/kernels/hip.hpp>
#include <migraphx/kernels/types.hpp>
#include <migraphx/kernels/integral_constant.hpp>

namespace migraphx {

struct index
{
    index_int global = 0;
    index_int local  = 0;
    index_int group  = 0;

#ifdef MIGRAPHX_NGLOBAL
    constexpr index_constant<MIGRAPHX_NGLOBAL> nglobal() const { return {}; }
#else
    __device__ index_int nglobal() const
    {
        return blockDim.x * gridDim.x; // NOLINT
    }
#endif

#ifdef MIGRAPHX_NLOCAL
    constexpr index_constant<MIGRAPHX_NLOCAL> nlocal() const { return {}; }
#else
    __device__ index_int nlocal() const
    {
        return blockDim.x; // NOLINT
    }
#endif
    template <class N>
    constexpr auto max_global_stride_iterations(N n) const
    {
        return _c<1> + n / nglobal();
    }

    template <class N>
    constexpr auto max_local_stride_iterations(N n) const
    {
        return _c<1> + n / nlocal();
    }

    template <class F>
    __device__ void global_stride(index_int n, F f) const
    {
        const auto stride = nglobal();
        for(index_int i = global; i < n; i += stride)
        {
            f(i);
        }
    }

    template <class F>
    __device__ void local_stride(index_int n, F f) const
    {
        const auto stride = nlocal();
        for(index_int i = local; i < n; i += stride)
        {
            f(i);
        }
    }
};

inline __device__ index make_index()
{
    return index{blockIdx.x * blockDim.x + threadIdx.x, threadIdx.x, blockIdx.x}; // NOLINT
}

} // namespace migraphx
#endif // MIGRAPHX_GUARD_KERNELS_INDEX_HPP
