from __future__ import annotations

import logging

logger = logging.getLogger(__name__)


class GoogleChatApprovalAuth:
    channel_label = "Google Chat"

    def resolve_approvers(self, cfg: dict, account_id: str) -> list[str]:
        gc_config = cfg.get("channels", {}).get("googlechat", {}) if cfg else {}
        allow_from = gc_config.get("dm", {}).get("allowFrom", [])

        if not allow_from:
            account_cfg = gc_config.get("accounts", {}).get(account_id, {})
            allow_from = account_cfg.get("dm", {}).get("allowFrom", [])
        else:
            account_cfg = gc_config.get("accounts", {}).get(account_id, {})
            account_allow_from = account_cfg.get("dm", {}).get("allowFrom", [])
            if account_allow_from:
                allow_from = account_allow_from

        return [a for a in (self._normalize_approver_id(entry) for entry in allow_from) if a]

    def _normalize_approver_id(self, value) -> str | None:
        if not value:
            return None
        for prefix in ("googlechat:",):
            if value.startswith(prefix):
                value = value[len(prefix):]
        if value.startswith("users/") and "@" in value:
            return None
        if value.startswith("users/"):
            return value.lower()
        return f"users/{value.lower()}"