/*
 * Copyright (c) 2018 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.
 */
#ifndef __ARM_COMPUTE_GRAPH2_BACKENDS_DETAIL_VALIDATE_HELPERS_H__
#define __ARM_COMPUTE_GRAPH2_BACKENDS_DETAIL_VALIDATE_HELPERS_H__

#include "arm_compute/graph2/Logger.h"
#include "arm_compute/graph2/Tensor.h"
#include "arm_compute/graph2/Types.h"
#include "arm_compute/graph2/nodes/Nodes.h"

#include "arm_compute/core/Error.h"
#include "arm_compute/core/ITensorInfo.h"

namespace arm_compute
{
namespace graph2
{
namespace backends
{
namespace detail
{
/** Returns backing tensor info of a given tensor
 *
 * @param[in] tensor Tensor to extract the backing tensor from
 *
 * @return Backing tensor tensor info if present else nullptr
 */
inline arm_compute::ITensorInfo *get_backing_tensor_info(arm_compute::graph2::Tensor *tensor)
{
    return ((tensor == nullptr) || (tensor->handle() == nullptr)) ? nullptr : tensor->handle()->tensor().info();
}

/** Validates a Convolution layer node
 *
 * @tparam ConvolutionLayer          Default Convolution layer function type
 * @tparam DirectConvolutionLayer    Direct Convolution layer function type
 * @tparam GEMMConvolutionLayer      GEMM Convolution layer function type
 * @tparam WinogradConvolutionLayer  Winograd Convolution layer function type
 *
 * @param[in] node Node to validate
 *
 * @return Status
 */
template <typename ConvolutionLayer, typename DirectConvolutionLayer, typename GEMMConvolutionLayer, typename WinogradConvolutionLayer>
Status validate_convolution_layer(ConvolutionLayerNode &node)
{
    ARM_COMPUTE_LOG_GRAPH_VERBOSE("Validating ConvolutionLayer node with ID : " << node.id() << " and Name: " << node.name() << std::endl);
    ARM_COMPUTE_RETURN_ERROR_ON(node.num_inputs() != 3);
    ARM_COMPUTE_RETURN_ERROR_ON(node.num_outputs() != 1);

    // Extract IO and info
    arm_compute::ITensorInfo *input          = get_backing_tensor_info(node.input(0));
    arm_compute::ITensorInfo *weights        = get_backing_tensor_info(node.input(1));
    arm_compute::ITensorInfo *biases         = get_backing_tensor_info(node.input(2));
    arm_compute::ITensorInfo *output         = get_backing_tensor_info(node.output(0));
    const PadStrideInfo       conv_info      = node.convolution_info();
    const ConvolutionMethod   conv_algorithm = node.convolution_method();

    // Validate function
    Status status{};
    switch(conv_algorithm)
    {
        case ConvolutionMethod::DIRECT:
            status = DirectConvolutionLayer::validate(input, weights, biases, output, conv_info);
            break;
        case ConvolutionMethod::GEMM:
            status = GEMMConvolutionLayer::validate(input, weights, biases, output, conv_info);
            break;
        case ConvolutionMethod::WINOGRAD:
            status = WinogradConvolutionLayer::validate(input, weights, biases, output, conv_info);
            break;
        default:
            break;
    }

    // If validation fails try the Default approach
    if(!bool(status) || (conv_algorithm == ConvolutionMethod::DEFAULT))
    {
        status = ConvolutionLayer::validate(input, weights, biases, output, conv_info);
        if(bool(status))
        {
            ARM_COMPUTE_LOG_GRAPH_INFO("Switched ConvolutionLayer method of node with ID : "
                                       << node.id() << " and Name: " << node.name() << std::endl);
            node.set_convolution_method(ConvolutionMethod::DEFAULT);
        }
    }

    return status;
}

/** Validates a Depthwise Convolution layer node
 *
 * @tparam DepthwiseConvolutionLayer    Default Depthwise Convolution layer type
 * @tparam DepthwiseConvolutionLayer3x3 Optimized 3x3 Depthwise Convolution layer type
 *
 * @param[in] node Node to validate
 *
 * @return Status
 */
template <typename DepthwiseConvolutionLayer, typename DepthwiseConvolutionLayer3x3>
Status validate_depthwise_convolution_layer(DepthwiseConvolutionLayerNode &node)
{
    ARM_COMPUTE_LOG_GRAPH_VERBOSE("Validating DepthwiseConvolutionLayer node with ID : " << node.id() << " and Name: " << node.name() << std::endl);
    ARM_COMPUTE_RETURN_ERROR_ON(node.num_inputs() != 3);
    ARM_COMPUTE_RETURN_ERROR_ON(node.num_outputs() != 1);

    // Extract IO and info
    arm_compute::ITensorInfo        *weights       = detail::get_backing_tensor_info(node.input(1));
    const DepthwiseConvolutionMethod dwc_algorithm = node.depthwise_convolution_method();
    ARM_COMPUTE_ERROR_ON(weights == nullptr);

    // TODO (geopin01) : Switch when validation is implemented
    // Validate function
    if((dwc_algorithm == DepthwiseConvolutionMethod::OPTIMIZED_3x3) && (weights->tensor_shape().x() != 3))
    {
        ARM_COMPUTE_LOG_GRAPH_INFO("Switched DepthwiseConvolutionLayer method of node with ID : "
                                   << node.id() << " and Name: " << node.name() << std::endl);
        node.set_depthwise_convolution_method(DepthwiseConvolutionMethod::DEFAULT);
    }

    return Status{};
}
} // namespace detail
} // namespace backends
} // namespace graph2
} // namespace arm_compute

#endif /* __ARM_COMPUTE_GRAPH2_BACKENDS_DETAIL_VALIDATE_HELPERS_H__ */