from __future__ import annotations


class EmailSmtpSecurityAdapter:
    def resolve_dm_policy(self, config: dict | None = None) -> dict:
        return {"mode": "open", "allow_from": []}

    def check_allowlist(self, sender_email: str) -> bool:
        config = self._load_config()
        policy = config.get("dm_policy", "open")
        if policy == "open":
            return True
        if policy == "disabled":
            return False
        if policy == "allowlist":
            allowlist = config.get("allowlist", [])
            return sender_email.lower() in [a.lower() for a in allowlist]
        if policy == "pairing":
            return True
        return False

    def collect_warnings(self, config: dict, account_id: str | None = None, account: dict | None = None) -> list[str]:
        return []

    @staticmethod
    def _load_config() -> dict:
        try:
            from yuxi.config import get_channel_config
            return get_channel_config("email-smtp") or {}
        except ImportError:
            return {}