// Copyright (C) 2018-2020 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
//

#include "ngraph_ops/nms_ie.hpp"

#include <memory>

#include <ngraph/opsets/opset1.hpp>

using namespace std;
using namespace ngraph;

constexpr NodeTypeInfo op::NonMaxSuppressionIE::type_info;

op::NonMaxSuppressionIE::NonMaxSuppressionIE(const Output<Node> &boxes,
                                             const Output<Node> &scores,
                                             const Output<Node> &max_output_boxes_per_class,
                                             const Output<Node> &iou_threshold,
                                             const Output<Node> &score_threshold,
                                             int center_point_box,
                                             bool sort_result_descending)
        : Op({boxes, scores, max_output_boxes_per_class, iou_threshold, score_threshold})
        , m_center_point_box(center_point_box)
        , m_sort_result_descending(sort_result_descending) {
    constructor_validate_and_infer_types();
}


std::shared_ptr<Node> op::NonMaxSuppressionIE::clone_with_new_inputs(const ngraph::OutputVector & new_args) const {
    check_new_args_count(this, new_args);
    return make_shared<NonMaxSuppressionIE>(new_args.at(0), new_args.at(1), new_args.at(2), new_args.at(3),
                                            new_args.at(4), m_center_point_box, m_sort_result_descending);
}

void op::NonMaxSuppressionIE::validate_and_infer_types() {
    auto squeeze_input = [](const Output<Node> & input) -> std::shared_ptr<Node> {
        return std::make_shared<opset1::Squeeze>(input, opset1::Constant::create(element::i64, Shape{1}, {0}));
    };

    // Calculate output shape using opset1::NonMaxSuppression
    auto max_output_boxes_per_class = std::dynamic_pointer_cast<opset1::Constant>(input_value(2).get_node_shared_ptr());
    auto nms = std::make_shared<opset1::NonMaxSuppression>(input_value(0),
            input_value(1),
            /* second input is used for output calculation and only if it's Constant output shape won't be dynamic */
            max_output_boxes_per_class ? opset1::Constant::create(element::i64, Shape{}, max_output_boxes_per_class->cast_vector<int64_t>()) :
            squeeze_input(input_value(2)),
            squeeze_input(input_value(3)),
            squeeze_input(input_value(4)));
    set_output_type(0, nms->output(0).get_element_type(), nms->output(0).get_partial_shape());
}
