# Copyright The Lightning AI 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 typing import List, Union

from lightning.pytorch import Trainer
from lightning.pytorch.callbacks import ModelSummary
from lightning.pytorch.demos.boring_classes import BoringModel


def test_model_summary_callback_present_trainer():
    trainer = Trainer()
    assert any(isinstance(cb, ModelSummary) for cb in trainer.callbacks)

    trainer = Trainer(callbacks=ModelSummary())
    assert any(isinstance(cb, ModelSummary) for cb in trainer.callbacks)


def test_model_summary_callback_with_enable_model_summary_false():
    trainer = Trainer(enable_model_summary=False)
    assert not any(isinstance(cb, ModelSummary) for cb in trainer.callbacks)


def test_model_summary_callback_with_enable_model_summary_true():
    trainer = Trainer(enable_model_summary=True)
    assert any(isinstance(cb, ModelSummary) for cb in trainer.callbacks)

    # Default value of max_depth is set as 1, when enable_model_summary is True
    # and ModelSummary is not passed in callbacks list
    model_summary_callback = list(filter(lambda cb: isinstance(cb, ModelSummary), trainer.callbacks))[0]
    assert model_summary_callback._max_depth == 1


def test_custom_model_summary_callback_summarize(tmpdir):
    class CustomModelSummary(ModelSummary):
        @staticmethod
        def summarize(
            summary_data: List[List[Union[str, List[str]]]],
            total_parameters: int,
            trainable_parameters: int,
            model_size: float,
        ) -> None:
            assert summary_data[1][0] == "Name"
            assert summary_data[1][1][0] == "layer"

            assert summary_data[2][0] == "Type"
            assert summary_data[2][1][0] == "Linear"

            assert summary_data[3][0] == "Params"
            assert total_parameters == 66
            assert trainable_parameters == 66

    model = BoringModel()
    trainer = Trainer(default_root_dir=tmpdir, callbacks=CustomModelSummary(), max_steps=1)

    trainer.fit(model)