/*
// Copyright (c) 2019 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
*/

#include "gather_inst.h"
#include "primitive_gpu_base.h"
#include "implementation_map.h"
#include "kernel_selector_helper.h"
#include "gather/gather_kernel_selector.h"
#include "gather/gather_kernel_ref.h"
#include "error_handler.h"

using namespace cldnn;

namespace cldnn
{
namespace gpu
{
    kernel_selector::gather_axis convert_axis(gather::gather_axis axis)
    {
        switch (axis)
        {
            case gather::along_x: return kernel_selector::gather_axis::X;
            case gather::along_y: return kernel_selector::gather_axis::Y;
            case gather::along_f: return kernel_selector::gather_axis::FEATURE;
            case gather::along_b: return kernel_selector::gather_axis::BATCH;
            default:
                return kernel_selector::gather_axis::X;
        }
    }

    struct gather_gpu : typed_primitive_gpu_impl<gather>
    {
        using parent = typed_primitive_gpu_impl<gather>;
        using parent::parent;

    public:

        static primitive_impl* create(const gather_node& arg)
        {
            auto gather_params = get_default_params<kernel_selector::gather_params>(arg);
            auto gather_optional_params = get_default_optional_params<kernel_selector::gather_optional_params>(arg.get_program());

            gather_params.axis = convert_axis(arg.get_primitive()->axis);

            gather_params.inputs.push_back(convert_data_tensor(arg.input(1).get_output_layout()));

            auto& kernel_selector = kernel_selector::gather_kernel_selector::Instance();
            auto best_kernels = kernel_selector.GetBestKernels(gather_params, gather_optional_params);

            CLDNN_ERROR_BOOL(arg.id(), "Best_kernel.empty()", best_kernels.empty(), "Cannot find a proper kernel with this arguments");

            auto gather = new gather_gpu(arg, best_kernels[0]);

            return gather;
        }
    };

    namespace
    {
        struct attach
        {
            attach()
            {
                auto val_fw = gather_gpu::create;
                implementation_map<gather>::add(std::make_tuple(engine_types::ocl, data_types::f32, format::bfyx), val_fw);
                implementation_map<gather>::add(std::make_tuple(engine_types::ocl, data_types::f16, format::bfyx), val_fw);
            }
            ~attach() = default;
        };
        attach attach_impl;
    }
} //namespace cldnn
} //namespace gpu
