import logging

from yuxi.channel.extensions.wechat_kf.types import KFAccount

logger = logging.getLogger(__name__)


class WeChatKFSecurity:
    VALID_POLICIES = {"open", "pairing", "allowlist", "disabled"}

    def __init__(self, account: KFAccount | None = None):
        self._account = account
        if account and account.dm_policy in self.VALID_POLICIES:
            self._policy = account.dm_policy
        else:
            self._policy = "open"
        self._allowlist: set[str] = set(account.allow_from) if account else set()

    def resolve_dm_policy(self) -> str:
        return self._policy

    def check_allowlist(self, external_user_id: str, channel_type: str = "wechat-kf") -> bool:
        if self._policy == "open":
            return True
        if self._policy == "disabled":
            return False
        if not self._allowlist:
            logger.warning("allowlist is empty with policy=%s", self._policy)
            return False
        return external_user_id in self._allowlist

    def add_to_allowlist(self, external_user_id: str):
        self._allowlist.add(external_user_id)

    def remove_from_allowlist(self, external_user_id: str):
        self._allowlist.discard(external_user_id)

    def is_policy(self, policy: str) -> bool:
        return self._policy == policy