from nonebot.typing import NoReturn
from nonebot.typing import Union, Optional
from nonebot.exception import RequestDenied
from nonebot.utils import logger_wrapper

log = logger_wrapper("CQHTTP")


def get_auth_bearer(
        access_token: Optional[str] = None) -> Union[Optional[str], NoReturn]:
    if not access_token:
        return None
    scheme, _, param = access_token.partition(" ")
    if scheme.lower() not in ["bearer", "token"]:
        raise RequestDenied(401, "Not authenticated")
    return param


def escape(s: str, *, escape_comma: bool = True) -> str:
    """
    :说明:

      对字符串进行 CQ 码转义。

    :参数:

      * ``s: str``: 需要转义的字符串
      * ``escape_comma: bool``: 是否转义逗号（``,``）。
    """
    s = s.replace("&", "&") \
        .replace("[", "[") \
        .replace("]", "]")
    if escape_comma:
        s = s.replace(",", ",")
    return s


def unescape(s: str) -> str:
    """
    :说明:

      对字符串进行 CQ 码去转义。

    :参数:

      * ``s: str``: 需要转义的字符串
    """
    return s.replace(",", ",") \
        .replace("[", "[") \
        .replace("]", "]") \
        .replace("&", "&")


def _b2s(b: Optional[bool]) -> Optional[str]:
    """转换布尔值为字符串。"""
    return b if b is None else str(b).lower()