/*
 * Copyright (c) 2020-2022 Arm Limited.
 *
 * SPDX-License-Identifier: MIT
 *
 * 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 "src/core/NEON/kernels/NEMaxUnpoolingLayerKernel.h"

#include "arm_compute/core/TensorInfo.h"
#include "arm_compute/core/Validate.h"
#include "arm_compute/core/Window.h"
#include "arm_compute/core/utils/misc/ShapeCalculator.h"
#include "src/core/CPP/Validate.h"
#include "src/core/common/Registrars.h"
#include "src/core/helpers/AutoConfiguration.h"
#include "src/core/helpers/WindowHelpers.h"
#include "src/cpu/kernels/maxunpool/list.h"
#include "support/ToolchainSupport.h"

namespace arm_compute
{
using namespace misc::shape_calculator;

namespace
{
struct MaxUnpoolingSelectorData
{
    DataType dt;
};

using MaxUnpoolingSelctorPtr = std::add_pointer<bool(const MaxUnpoolingSelectorData &data)>::type;
using MaxUnpoolingUKernelPtr = std::add_pointer<void(const ITensor *input, ITensor *output, const ITensor *indices, const Window &window)>::type;

struct MaxUnpoolingKernel
{
    const char                  *name;
    const MaxUnpoolingSelctorPtr is_selected;
    MaxUnpoolingUKernelPtr       ukernel;
};

static const MaxUnpoolingKernel available_kernels[] =
{
    {
        "fp32_neon_maxunpooling",
        [](const MaxUnpoolingSelectorData & data) { return data.dt == DataType::F32; },
        REGISTER_FP32_NEON(arm_compute::cpu::neon_fp32_maxunpooling)
    },
#ifdef __ARM_FEATURE_FP16_VECTOR_ARITHMETIC
    {
        "fp16_neon_maxunpooling",
        [](const MaxUnpoolingSelectorData & data) { return data.dt == DataType::F16; },
        REGISTER_FP16_NEON(arm_compute::cpu::neon_fp16_maxunpooling)
    },
#endif // __ARM_FEATURE_FP16_VECTOR_ARITHMETIC
#if defined(ARM_COMPUTE_ENABLE_NEON)
    {
        "qs8_neon_maxunpooling",
        [](const MaxUnpoolingSelectorData & data) { return data.dt == DataType::QASYMM8; },
        REGISTER_QASYMM8_NEON(arm_compute::cpu::neon_qs8_maxunpooling)
    },
    {
        "qu8_neon_maxunpooling",
        [](const MaxUnpoolingSelectorData & data) { return data.dt == DataType::QASYMM8_SIGNED; },
        REGISTER_QASYMM8_SIGNED_NEON(arm_compute::cpu::neon_qu8_maxunpooling)
    },
#endif //defined(ARM_COMPUTE_ENABLE_NEON)
};

/** Micro-kernel selector
 *
 * @param[in] data Selection data passed to help pick the appropriate micro-kernel
 *
 * @return A matching micro-kernel else nullptr
 */
const MaxUnpoolingKernel *get_implementation(const MaxUnpoolingSelectorData &data)
{
    for(const auto &uk : available_kernels)
    {
        if(uk.is_selected(data))
        {
            return &uk;
        }
    }
    return nullptr;
}

Status validate_arguments(const ITensorInfo *input, const ITensorInfo *output, const PoolingLayerInfo &pool_info, const ITensorInfo *indices)
{
    ARM_COMPUTE_RETURN_ERROR_ON_NULLPTR(input, output, indices);
    ARM_COMPUTE_RETURN_ERROR_ON_CPU_F16_UNSUPPORTED(input);
    ARM_COMPUTE_RETURN_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(input, 1, DataType::QASYMM8, DataType::QASYMM8_SIGNED, DataType::F16, DataType::F32);
    ARM_COMPUTE_RETURN_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(indices, 1, DataType::U32);
    ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_SHAPES(input, indices);

    int                 pool_stride_x   = 0;
    int                 pool_stride_y   = 0;
    PoolingType         pool_type       = pool_info.pool_type;
    const PadStrideInfo pad_stride_info = pool_info.pad_stride_info;
    std::tie(pool_stride_x, pool_stride_y) = pad_stride_info.stride();
    const int    pool_size_x = pool_info.pool_size.width;
    const int    pool_size_y = pool_info.pool_size.height;
    const Size2D pool_size(pool_size_x, pool_size_y);

    ARM_COMPUTE_RETURN_ERROR_ON_MSG(pool_type != PoolingType::MAX, "Pooling indices only supported for MAX pooling method");
    ARM_COMPUTE_RETURN_ERROR_ON_MSG((pool_size != Size2D(2, 2)), "Pooling indices only supported for pool size 2x2");
    if(output->total_size() != 0)
    {
        ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_DATA_TYPES(input, output);
        ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_DATA_LAYOUT(input, output);
    }

    return Status{};
}
} // namespace

NEMaxUnpoolingLayerKernel::NEMaxUnpoolingLayerKernel()
    : _input(nullptr), _output(nullptr), _indices(nullptr)
{
}

void NEMaxUnpoolingLayerKernel::configure(const ITensor *input, const ITensor *indices, ITensor *output, const PoolingLayerInfo &pool_info)
{
    ARM_COMPUTE_ERROR_ON_NULLPTR(input, output);
    ARM_COMPUTE_ERROR_THROW_ON(validate_arguments(input->info(), output->info(), pool_info, indices->info()));

    _input   = input;
    _output  = output;
    _indices = indices;

    const TensorShape output_shape = compute_unpool_shape(*input->info(), pool_info);
    auto_init_if_empty(*output->info(), input->info()->clone()->set_tensor_shape(output_shape));

    auto window = calculate_max_window(*input->info(), Steps());
    INEKernel::configure(window);
}

Status NEMaxUnpoolingLayerKernel::validate(const ITensorInfo *input, const ITensorInfo *indices, const ITensorInfo *output, const PoolingLayerInfo &pool_info)
{
    ARM_COMPUTE_RETURN_ERROR_ON_NULLPTR(input, indices, output);
    ARM_COMPUTE_RETURN_ON_ERROR(validate_arguments(input, output, pool_info, indices));
    return Status{};
}

void NEMaxUnpoolingLayerKernel::run(const Window &window, const ThreadInfo &info)
{
    ARM_COMPUTE_UNUSED(info);
    ARM_COMPUTE_ERROR_ON_UNCONFIGURED_KERNEL(this);
    ARM_COMPUTE_ERROR_ON_INVALID_SUBWINDOW(INEKernel::window(), window);
    const auto *uk = get_implementation(MaxUnpoolingSelectorData{ _input->info()->data_type() });
    ARM_COMPUTE_ERROR_ON(uk == nullptr || uk->ukernel == nullptr);

    uk->ukernel(_input, _output, _indices, window);
}
} // namespace arm_compute