#   Copyright (c) 2019  PaddlePaddle Authors. All Rights Reserved.
#
# 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 __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from paddle.fluid.framework import Variable
from paddle_hub.utils import to_list


class Signature:
    def __init__(self, name, inputs, outputs):
        self.name = name
        inputs = to_list(inputs)
        outputs = to_list(outputs)

        for item in inputs:
            assert isinstance(
                item,
                Variable), "the item of inputs list shoule be paddle Variable"

        for item in outputs:
            assert isinstance(
                item,
                Variable), "the item of outputs list shoule be paddle Variable"

        self.inputs = inputs
        self.outputs = outputs

    def get_name(self):
        return self.name

    def get_inputs(self):
        return self.inputs

    def get_outputs(self):
        return self.outputs


def create_signature(name="default", inputs=[], outputs=[]):

    return Signature(name=name, inputs=inputs, outputs=outputs)