/*
 * 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.
 */
#include <migraphx/onnx/op_parser.hpp>
#include <migraphx/ranges.hpp>
#include <migraphx/instruction.hpp>
#include <migraphx/make_op.hpp>

namespace migraphx {
inline namespace MIGRAPHX_INLINE_NS {
namespace onnx {

struct parse_depthtospace : op_parser<parse_depthtospace>
{
    std::vector<op_desc> operators() const { return {{"DepthToSpace"}}; }

    instruction_ref parse(const op_desc& /*opd*/,
                          const onnx_parser& /*parser*/,
                          const onnx_parser::node_info& info,
                          std::vector<instruction_ref> args) const
    {
        auto s = args[0]->get_shape();
        // mode attribute of DepthToSpace
        auto mode = std::string("DCR");
        if(contains(info.attributes, "mode"))
        {
            mode = info.attributes.at("mode").s(); // DCR or CRD?
        }
        // blocksize attribute of DepthToSpace
        int blocksize = 0;
        if(contains(info.attributes, "blocksize"))
        {
            blocksize = info.attributes.at("blocksize").i();
        }
        if(blocksize < 1)
        {
            MIGRAPHX_THROW("DepthToSpace: blocksize is less than 1");
        }
        // calculate dimensions
        auto lens1            = s.lens();
        auto lens2            = s.lens();
        unsigned long divisor = std::pow(blocksize, 2);
        if((lens2[1] % divisor) == 0)
            lens2[1] = lens2[1] / divisor;
        else
            MIGRAPHX_THROW("DepthToSpace: div by blocksize quotient not int ");
        lens1.push_back(lens1[2]);
        lens1.push_back(lens1[3]);
        lens2[2] = lens2[2] * blocksize;
        lens2[3] = lens2[3] * blocksize;
        lens1[2] = blocksize;
        std::vector<int64_t> perm;
        if(mode == "DCR")
        {
            lens1[3] = lens1[1] / divisor;
            lens1[1] = blocksize;
            perm     = {0, 3, 4, 1, 5, 2};
        }
        else if(mode == "CRD")
        {
            lens1[1] = lens1[1] / divisor;
            lens1[3] = blocksize;
            perm     = {0, 1, 4, 2, 5, 3};
        }
        else
            MIGRAPHX_THROW("DepthToSpace: mode attribute cannot be read.");

        auto temp1 = info.add_instruction(make_op("reshape", {{"dims", lens1}}), args[0]);
        auto temp2 = info.add_instruction(make_op("transpose", {{"permutation", perm}}), temp1);
        return info.add_instruction(make_op("reshape", {{"dims", lens2}}), temp2);
    }
};

} // namespace onnx
} // namespace MIGRAPHX_INLINE_NS
} // namespace migraphx
