"""
 Copyright (C) 2018-2020 Intel Corporation

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
"""

from extensions.ops.unique import Unique
from mo.front.extractor import FrontExtractorOp


class UniqueFrontExtractor(FrontExtractorOp):
    op = 'Unique'
    enabled = True

    @classmethod
    def extract(cls, node):
        # TensorFlow Unique operation always returns two outputs: unique elements and indices
        # The unique elements in the output are not sorted
        attrs = {
            'sorted': 'false',
            'return_inverse': 'true',
            'return_counts': 'false'
        }

        Unique.update_node_stat(node, attrs)

        return cls.enabled
