/*
 * 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_OPERATORS_REVERSE_HPP
#define MIGRAPHX_GUARD_OPERATORS_REVERSE_HPP

#include <algorithm>
#include <vector>
#include <cmath>
#include <utility>
#include <migraphx/check_shapes.hpp>
#include <migraphx/config.hpp>
#include <migraphx/argument.hpp>
#include <migraphx/op/normalize_attribute.hpp>
#include <migraphx/shape_for_each.hpp>
#include <migraphx/value.hpp>

namespace migraphx {
inline namespace MIGRAPHX_INLINE_NS {
namespace op {

struct reverse
{

    std::vector<int64_t> axes;

    template <class Self, class F>
    static auto reflect(Self& self, F f)
    {
        return pack(f(self.axes, "axes"));
    }

    std::string name() const { return "reverse"; }

    value attributes() const
    {
        value normalize;
        normalize["axes"] = value::array{normalize_attribute::include_min};
        return {{"normalize_axes", normalize}};
    }

    shape normalize_compute_shape(std::vector<shape> inputs) const
    {
        check_shapes{inputs, *this}.has(1);
        return inputs[0].with_lens(inputs[0].lens());
    }

    argument compute(const shape& s, std::vector<argument> args) const
    {
        argument result{s};
        auto lens = s.lens();
        visit_all(result, args.front())([&](auto output, auto input) {
            shape_for_each(s, [&](const auto& out_idx) {
                auto in_idx = out_idx;
                for(const auto& axis : axes)
                {
                    in_idx[axis] = lens[axis] - 1 - out_idx[axis];
                }
                output[s.index(out_idx)] = input[s.index(in_idx)];
            });
        });

        return result;
    }
};

} // namespace op
} // namespace MIGRAPHX_INLINE_NS
} // namespace migraphx

#endif
