# Copyright The PyTorch Lightning team.
#
# 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 lightning_lite.strategies.deepspeed import _DEEPSPEED_AVAILABLE
from lightning_lite.strategies.fairscale import _FAIRSCALE_AVAILABLE
from lightning_lite.utilities.imports import (
    _APEX_AVAILABLE,
    _HOROVOD_AVAILABLE,
    _OMEGACONF_AVAILABLE,
    _POPTORCH_AVAILABLE,
)


def test_imports():
    try:
        import apex  # noqa
    except ModuleNotFoundError:
        assert not _APEX_AVAILABLE
    else:
        assert _APEX_AVAILABLE

    try:
        import deepspeed  # noqa
    except ModuleNotFoundError:
        assert not _DEEPSPEED_AVAILABLE
    else:
        assert _DEEPSPEED_AVAILABLE

    try:
        import fairscale.nn  # noqa
    except ModuleNotFoundError:
        assert not _FAIRSCALE_AVAILABLE
    else:
        assert _FAIRSCALE_AVAILABLE

    try:
        import horovod.torch  # noqa
    except ModuleNotFoundError:
        assert not _HOROVOD_AVAILABLE
    else:
        assert _HOROVOD_AVAILABLE

    try:
        import omegaconf  # noqa
    except ModuleNotFoundError:
        assert not _OMEGACONF_AVAILABLE
    else:
        assert _OMEGACONF_AVAILABLE

    try:
        import poptorch  # noqa
    except ModuleNotFoundError:
        assert not _POPTORCH_AVAILABLE
    else:
        assert _POPTORCH_AVAILABLE