"""
 Copyright (c) 2018 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.
"""

import numpy as np

from mo.front.caffe.extractors.utils import embed_input
from mo.front.common.partial_infer.elemental import copy_shape_infer
from mo.front.extractor import FrontExtractorOp
from mo.front.kaldi.loader.utils import read_binary_integer32_token, read_blob
from mo.ops.permute import Permute


class CopyFrontExtractor(FrontExtractorOp):
    op = 'copy'
    enabled = True

    @staticmethod
    def extract(node):
        pb = node.parameters
        weights_size = read_binary_integer32_token(pb)
        weights = read_blob(pb, weights_size, dtype=np.int32) - 1
        attrs = {
            'infer': copy_shape_infer
        }
        embed_input(attrs, 1, 'indexes', weights)
        Permute.update_node_stat(node, attrs)
        return __class__.enabled
