# coding=utf-8
# Copyright 2020 Optuna, Hugging Face
#
# 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.
"""Logging utilities."""

import logging
import os
from logging import (
    CRITICAL,  # NOQA
    DEBUG,  # NOQA
    ERROR,  # NOQA
    FATAL,  # NOQA
    INFO,  # NOQA
    NOTSET,  # NOQA
    WARN,  # NOQA
    WARNING,  # NOQA
)
from typing import Optional

from .. import constants


log_levels = {
    "debug": logging.DEBUG,
    "info": logging.INFO,
    "warning": logging.WARNING,
    "error": logging.ERROR,
    "critical": logging.CRITICAL,
}

_default_log_level = logging.WARNING


def _get_library_name() -> str:
    return __name__.split(".")[0]


def _get_library_root_logger() -> logging.Logger:
    return logging.getLogger(_get_library_name())


def _get_default_logging_level():
    """
    If `HF_HUB_VERBOSITY` env var is set to one of the valid choices return that as the new default level. If it is not
    - fall back to `_default_log_level`
    """
    env_level_str = os.getenv("HF_HUB_VERBOSITY", None)
    if env_level_str:
        if env_level_str in log_levels:
            return log_levels[env_level_str]
        else:
            logging.getLogger().warning(
                f"Unknown option HF_HUB_VERBOSITY={env_level_str}, has to be one of: {', '.join(log_levels.keys())}"
            )
    return _default_log_level


def _configure_library_root_logger() -> None:
    library_root_logger = _get_library_root_logger()
    library_root_logger.addHandler(logging.StreamHandler())
    library_root_logger.setLevel(_get_default_logging_level())


def _reset_library_root_logger() -> None:
    library_root_logger = _get_library_root_logger()
    library_root_logger.setLevel(logging.NOTSET)


def get_logger(name: Optional[str] = None) -> logging.Logger:
    """
        Returns a logger with the specified name. This function is not supposed
        to be directly accessed by library users.

        Args:
            name (`str`, *optional*):
                The name of the logger to get, usually the filename

        Example:

    ```python
    >>> from huggingface_hub import get_logger

    >>> logger = get_logger(__file__)
    >>> logger.set_verbosity_info()
    ```
    """

    if name is None:
        name = _get_library_name()

    return logging.getLogger(name)


def get_verbosity() -> int:
    """Return the current level for the HuggingFace Hub's root logger.

    Returns:
        Logging level, e.g., `huggingface_hub.logging.DEBUG` and
        `huggingface_hub.logging.INFO`.

    <Tip>

    HuggingFace Hub has following logging levels:

    - `huggingface_hub.logging.CRITICAL`, `huggingface_hub.logging.FATAL`
    - `huggingface_hub.logging.ERROR`
    - `huggingface_hub.logging.WARNING`, `huggingface_hub.logging.WARN`
    - `huggingface_hub.logging.INFO`
    - `huggingface_hub.logging.DEBUG`

    </Tip>
    """
    return _get_library_root_logger().getEffectiveLevel()


def set_verbosity(verbosity: int) -> None:
    """
    Sets the level for the HuggingFace Hub's root logger.

    Args:
        verbosity (`int`):
            Logging level, e.g., `huggingface_hub.logging.DEBUG` and
            `huggingface_hub.logging.INFO`.
    """
    _get_library_root_logger().setLevel(verbosity)


def set_verbosity_info():
    """
    Sets the verbosity to `logging.INFO`.
    """
    return set_verbosity(INFO)


def set_verbosity_warning():
    """
    Sets the verbosity to `logging.WARNING`.
    """
    return set_verbosity(WARNING)


def set_verbosity_debug():
    """
    Sets the verbosity to `logging.DEBUG`.
    """
    return set_verbosity(DEBUG)


def set_verbosity_error():
    """
    Sets the verbosity to `logging.ERROR`.
    """
    return set_verbosity(ERROR)


def disable_propagation() -> None:
    """
    Disable propagation of the library log outputs. Note that log propagation is
    disabled by default.
    """
    _get_library_root_logger().propagate = False


def enable_propagation() -> None:
    """
    Enable propagation of the library log outputs. Please disable the
    HuggingFace Hub's default handler to prevent double logging if the root
    logger has been configured.
    """
    _get_library_root_logger().propagate = True


_configure_library_root_logger()

if constants.HF_DEBUG:
    # If `HF_DEBUG` environment variable is set, set the verbosity of `huggingface_hub` logger to `DEBUG`.
    set_verbosity_debug()