import logging

logger = logging.getLogger(__name__)

POLICY_OPEN = "open"
POLICY_PAIRING = "pairing"
POLICY_ALLOWLIST = "allowlist"
POLICY_DISABLED = "disabled"

VALID_POLICIES = {POLICY_OPEN, POLICY_PAIRING, POLICY_ALLOWLIST, POLICY_DISABLED}


class MessengerSecurity:
    @staticmethod
    def resolve_dm_policy(account: dict) -> str:
        policy = account.get("dm_policy", POLICY_PAIRING)
        if policy not in VALID_POLICIES:
            logger.warning(f"messenger invalid dm_policy '{policy}', defaulting to {POLICY_PAIRING}")
            return POLICY_PAIRING
        return policy

    @staticmethod
    def check_allowlist(peer_id: str, account: dict) -> bool:
        allow_from: list[str] = account.get("allow_from", [])
        if not allow_from:
            return True
        return peer_id in allow_from