# Copyright 2025 HuggingFace Inc. and the LlamaFactory team.
#
# This code is inspired by the HuggingFace's transformers library.
# https://github.com/huggingface/transformers/blob/v4.40.0/src/transformers/utils/import_utils.py
#
# 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 importlib.metadata
import importlib.util
from functools import lru_cache
from typing import TYPE_CHECKING

from packaging import version
from transformers.utils.versions import require_version

from . import logging
from .env import is_env_enabled


logger = logging.get_logger(__name__)


if TYPE_CHECKING:
    from packaging.version import Version


def _is_package_available(name: str) -> bool:
    return importlib.util.find_spec(name) is not None


def _get_package_version(name: str) -> "Version":
    try:
        return version.parse(importlib.metadata.version(name))
    except Exception:
        return version.parse("0.0.0")


@lru_cache
def is_transformers_version_greater_than(content: str):
    return _get_package_version("transformers") >= version.parse(content)


def check_version(requirement: str, mandatory: bool = False) -> None:
    r"""Optionally check the package version."""
    if is_env_enabled("DISABLE_VERSION_CHECK") and not mandatory:
        logger.warning_rank0_once("Version checking has been disabled, may lead to unexpected behaviors.")
        return

    if "gptqmodel" in requirement or "autoawq" in requirement:
        pip_command = f"pip install {requirement} --no-build-isolation"
    else:
        pip_command = f"pip install {requirement}"

    if mandatory:
        hint = f"To fix: run `{pip_command}`."
    else:
        hint = f"To fix: run `{pip_command}` or set `DISABLE_VERSION_CHECK=1` to skip this check."

    require_version(requirement, hint)