# 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.
import os
import warnings
from functools import partial, wraps
from typing import Any, Callable

from torchmetrics import _logger as log


def rank_zero_only(fn: Callable) -> Callable:
    @wraps(fn)
    def wrapped_fn(*args: Any, **kwargs: Any) -> Any:
        if rank_zero_only.rank == 0:  # type: ignore
            return fn(*args, **kwargs)

    return wrapped_fn


# add the attribute to the function but don't overwrite in case Trainer has already set it
rank_zero_only.rank = getattr(rank_zero_only, "rank", int(os.environ.get("LOCAL_RANK", 0)))  # type: ignore


def _warn(*args: Any, **kwargs: Any) -> None:
    warnings.warn(*args, **kwargs)


def _info(*args: Any, **kwargs: Any) -> None:
    log.info(*args, **kwargs)


def _debug(*args: Any, **kwargs: Any) -> None:
    log.debug(*args, **kwargs)


rank_zero_debug = rank_zero_only(_debug)
rank_zero_info = rank_zero_only(_info)
rank_zero_warn = rank_zero_only(_warn)
_future_warning = partial(warnings.warn, category=FutureWarning)