// Copyright (C) 2018-2026 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
//

#include "common_op_table.hpp"
#include "openvino/frontend/tensorflow/node_context.hpp"
#include "openvino/frontend/tensorflow/variable.hpp"
#include "openvino/op/subtract.hpp"

using namespace std;
using namespace ov;
using namespace ov::op;
using namespace ov::frontend::tensorflow;

namespace ov {
namespace frontend {
namespace tensorflow {
namespace op {

OutputVector translate_assign_sub_op(const NodeContext& node) {
    default_op_checks(node, 2, {"AssignSub"});
    auto ref = as_type_ptr<Variable>(node.get_input_by_reference(0).get_node_shared_ptr());
    TENSORFLOW_OP_VALIDATION(
        node,
        ref,
        "[TensorFlow Frontend] internal error: AssignSub operation expects variable by the first input");

    // create new variable operation node that will represent the same variable but it will be initialized with value
    auto value_to_subtract = node.get_input(1);
    auto current_value = ref->get_value();
    auto new_value = make_shared<v1::Subtract>(current_value, value_to_subtract);
    auto new_ref = make_shared<Variable>(*ref, new_value);

    // since this operation produces new state of the variable
    // it needs to update variables map
    auto variables_state_map = node.get_variable_state_map();
    TENSORFLOW_OP_VALIDATION(node,
                             variables_state_map,
                             "[TensorFlow Frontend] internal error: variable state map is nullptr");
    variables_state_map->update_variable_state_map_for_node(node.get_name(), new_ref);
    return {new_ref};
}

}  // namespace op
}  // namespace tensorflow
}  // namespace frontend
}  // namespace ov
