# Copyright (c) 2021, NVIDIA CORPORATION.  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.

import os
import shutil
import tempfile

import pytest
import wget
from omegaconf import OmegaConf

from nemo.collections.nlp.models import EntityLinkingModel


def get_cfg():

    language_model = OmegaConf.create(
        {"pretrained_model_name": "bert-base-uncased", "config_file": None, "config": None, "lm_checkpoint": None}
    )

    tokenizer = OmegaConf.create(
        {"tokenizer_name": "bert-base-uncased", "vocab_file": None, "tokenizer_model": None, "do_lower_case": True}
    )

    model = OmegaConf.create(
        {
            "nemo_path": "sap_entity_linking.nemo",
            "max_seq_length": 128,
            "language_model": language_model,
            "tokenizer": tokenizer,
            "train_ds": None,
            "validation_ds": None,
        }
    )

    cfg = OmegaConf.create({"model": model})

    return cfg


class TestEntityLinkingModel:
    @pytest.mark.with_downloads()
    @pytest.mark.unit
    def test_creation_saving_restoring(self):
        # Create a new temporary directory
        with tempfile.TemporaryDirectory() as restore_dir:
            with tempfile.TemporaryDirectory() as save_dir:
                model = EntityLinkingModel(cfg=get_cfg().model)
                assert isinstance(model, EntityLinkingModel)

                save_dir_path = save_dir

                # Where model will be saved
                model_save_path = os.path.join(save_dir, f"{model.__class__.__name__}.nemo")
                model.save_to(save_path=model_save_path)

                # Where model will be restored from
                model_restore_path = os.path.join(restore_dir, f"{model.__class__.__name__}.nemo")
                shutil.copy(model_save_path, model_restore_path)

            # at this point save_dir should not exist
            assert save_dir_path is not None and not os.path.exists(save_dir_path)
            assert not os.path.exists(model_save_path)
            assert os.path.exists(model_restore_path)

            # attempt to restore
            model_copy = model.__class__.restore_from(restore_path=model_restore_path)
            assert model.num_weights == model_copy.num_weights


if __name__ == "__main__":
    t = TestEntityLinkingModel()
    t.test_creation_saving_restoring()