/*
 * 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_SQUEEZE_HPP
#define MIGRAPHX_GUARD_OPERATORS_SQUEEZE_HPP

#include <migraphx/check_shapes.hpp>
#include <migraphx/argument.hpp>
#include <migraphx/config.hpp>
#include <migraphx/value.hpp>
#include <migraphx/op/normalize_attribute.hpp>
#include <migraphx/dyn_output.hpp>

namespace migraphx {
inline namespace MIGRAPHX_INLINE_NS {
namespace op {

struct squeeze
{
    std::vector<int64_t> axes;

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

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

    std::string name() const { return "squeeze"; }
    shape normalize_compute_shape(std::vector<shape> inputs) const
    {
        check_shapes{inputs, *this, true}.has(1);
        auto input_shape = inputs[0];
        if(input_shape.dynamic())
        {
            std::vector<shape::dynamic_dimension> one_dyn_dims{{1, 1, 0}, {1, 1, 1}};
            if(std::any_of(axes.begin(), axes.end(), [&](auto axis) {
                   return not contains(one_dyn_dims, input_shape.dyn_dims()[axis]);
               }))
            {
                MIGRAPHX_THROW(
                    "SQUEEZE: dynamic axis dimension should be equal to {1, 1, 0} or {1, 1, 1}");
            }
            std::vector<shape::dynamic_dimension> dyn_dims = {};
            if(axes.empty())
            {
                for(auto i : range(input_shape.ndim()))
                {
                    auto dd = input_shape.dyn_dims()[i];
                    if(not contains(one_dyn_dims, dd))
                    {
                        dyn_dims.push_back(dd);
                    }
                }
            }
            else
            {
                for(auto i : range(input_shape.ndim()))
                {
                    if(std::find(axes.begin(), axes.end(), i) == axes.end())
                    {
                        dyn_dims.push_back(input_shape.dyn_dims()[i]);
                    }
                }
            }
            return {input_shape.type(), dyn_dims};
        }
        else
        {
            auto type        = input_shape.type();
            auto old_lens    = input_shape.lens();
            auto old_strides = input_shape.strides();
            if(std::any_of(
                   axes.begin(), axes.end(), [&](auto axis) { return old_lens[axis] != 1; }))
            {
                MIGRAPHX_THROW("SQUEEZE: static axis dimension should be equal to 1");
            }
            std::vector<std::size_t> new_lens;
            std::vector<std::size_t> new_strides;
            if(axes.empty())
            {
                for(auto i : range(old_lens.size()))
                {
                    if(old_lens[i] != 1)
                    {
                        new_lens.push_back(old_lens[i]);
                        new_strides.push_back(old_strides[i]);
                    }
                }
            }
            else
            {
                for(auto i : range(old_lens.size()))
                {
                    if(std::find(axes.begin(), axes.end(), i) == axes.end())
                    {
                        new_lens.push_back(old_lens[i]);
                        new_strides.push_back(old_strides[i]);
                    }
                }
            }
            if(new_lens.empty())
            {
                return shape{type};
            }
            else
            {
                return shape{type, new_lens, new_strides};
            }
        }
    }

    argument compute(const dyn_output& dyn_out, std::vector<argument> args) const
    {
        return args[0].reshape(dyn_out.computed_shape);
    }
    std::ptrdiff_t output_alias(const std::vector<shape>&) const { return 0; }
};

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

#endif
