/*
 * Copyright (c) 2018-2020 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 <complex>

#include "arm_compute/runtime/CL/functions/CLStackLayer.h"

#include "arm_compute/core/CL/ICLTensor.h"
#include "arm_compute/core/Error.h"
#include "arm_compute/core/Helpers.h"
#include "arm_compute/core/TensorInfo.h"
#include "arm_compute/core/Types.h"
#include "arm_compute/core/utils/misc/ShapeCalculator.h"
#include "arm_compute/runtime/CL/CLScheduler.h"
#include "src/core/CL/kernels/CLStackLayerKernel.h"

namespace arm_compute
{
CLStackLayer::CLStackLayer() // NOLINT
    : _input(),
      _stack_kernels(),
      _num_inputs(0)
{
}

CLStackLayer::~CLStackLayer() = default;

void CLStackLayer::configure(const std::vector<ICLTensor *> &input, int axis, ICLTensor *output)
{
    configure(CLKernelLibrary::get().get_compile_context(), input, axis, output);
}

void CLStackLayer::configure(const CLCompileContext &compile_context, const std::vector<ICLTensor *> &input, int axis, ICLTensor *output)
{
    _num_inputs = input.size();
    _stack_kernels.reserve(_num_inputs);

    // Wrap around negative values
    const unsigned int axis_u = wrap_around(axis, static_cast<int>(input[0]->info()->num_dimensions() + 1));

    for(unsigned int i = 0; i < _num_inputs; i++)
    {
        _stack_kernels.emplace_back(std::make_unique<CLStackLayerKernel>());
        _stack_kernels.back()->configure(compile_context, input[i], axis_u, i, _num_inputs, output);
    }
}

Status CLStackLayer::validate(const std::vector<ITensorInfo *> &input, int axis, const ITensorInfo *output)
{
    ARM_COMPUTE_RETURN_ERROR_ON_NULLPTR(output);
    ARM_COMPUTE_RETURN_ERROR_ON(input.empty());

    // Wrap around negative values
    const size_t       rank   = input[0]->num_dimensions();
    const unsigned int axis_u = wrap_around(axis, static_cast<int>(rank + 1));

    const unsigned int num_inputs = input.size();

    for(unsigned int i = 0; i < num_inputs; i++)
    {
        // All the tensors must have the same rank
        ARM_COMPUTE_RETURN_ERROR_ON(input[i]->num_dimensions() != rank);
        // Validate Kernel
        ARM_COMPUTE_RETURN_ON_ERROR(CLStackLayerKernel::validate(input[i], axis_u, i, num_inputs, output));
    }

    return Status{};
}

void CLStackLayer::run()
{
    for(unsigned i = 0; i < _num_inputs; i++)
    {
        CLScheduler::get().enqueue(*_stack_kernels[i], false);
    }
}
} // namespace arm_compute