"""应用版本信息。"""

from functools import lru_cache
from importlib.metadata import PackageNotFoundError, version as package_version
from pathlib import Path
import tomllib


@lru_cache(maxsize=1)
def get_app_version() -> str:
    """从 pyproject.toml 读取应用版本，读取失败时回退到包元数据。"""
    pyproject_path = Path(__file__).resolve().parents[2] / "pyproject.toml"
    if pyproject_path.exists():
        with pyproject_path.open("rb") as file:
            pyproject = tomllib.load(file)
        version = pyproject.get("project", {}).get("version")
        if isinstance(version, str) and version:
            return version

    try:
        return package_version("douyu-login-py")
    except PackageNotFoundError:
        return "0.0.0"