"""
 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.
"""

import logging as log

import numpy as np

from mo.graph.graph import Node, Graph


def find_unsupported_ops(graph: Graph):
    """
    The function returns list of node name those are not supported. Currently nodes that product non FP32 data tensors
    or has undefined 'type' attribute are considered unsupported.
    :param graph: current graph with operations. Data nodes are not yet added.
    :return: the list of node names which are not supported
    """
    unsupported = list()
    for node_name in graph.nodes():
        node = Node(graph, node_name)
        # op node that produce non FP32 data or has no type are considered unsupported
        if node.kind == 'op':
            if node.has_valid('type') or (node.has_valid('op') and node.op == 'Result'):
                for out_data_node in node.out_nodes().values():
                    if out_data_node.has_valid('data_type') and out_data_node.data_type != np.float32:
                        log.info('Node "{}" produces output as non FP32. Consider it unsupported'.format(node_name))
                        unsupported.append(node.id)
            else:
                log.info('Node "{}" does not have type. Consider it unsupported'.format(node_name))
                unsupported.append(node.id)
    return unsupported

