import logging
import time
from collections import defaultdict

logger = logging.getLogger(__name__)

DEFAULT_RATE_LIMIT_WINDOW = 10
DEFAULT_RATE_LIMIT_MAX = 5

_sender_timestamps: dict[str, list[float]] = defaultdict(list)


def check_mc_allowlist(sender_name: str, allow_from: list[str]) -> bool:
    if not allow_from:
        return True
    return sender_name.lower() in [name.lower() for name in allow_from]


def is_mc_mentioned(content: str, bot_username: str) -> bool:
    return bot_username.lower() in content.lower()


def check_rate_limit(
    sender_id: str,
    window: float = DEFAULT_RATE_LIMIT_WINDOW,
    max_msgs: int = DEFAULT_RATE_LIMIT_MAX,
) -> bool:
    now = time.monotonic()
    timestamps = _sender_timestamps[sender_id]

    cutoff = now - window
    while timestamps and timestamps[0] < cutoff:
        timestamps.pop(0)

    if len(timestamps) >= max_msgs:
        return False

    timestamps.append(now)

    if len(_sender_timestamps) > 500:
        stale = [k for k, v in _sender_timestamps.items() if not v]
        for k in stale:
            del _sender_timestamps[k]

    return True


def resolve_mc_group_policy(account) -> str:
    return getattr(account, "group_policy", "mention") or "mention"


def collect_mc_security_warnings(account) -> list[str]:
    warnings = []
    if account.auth_mode == "offline":
        warnings.append(
            "Minecraft is in offline mode — player UUIDs are not cryptographically verified. "
            "allow_from only matches by username."
        )
    if account.group_policy == "always":
        warnings.append("Minecraft group policy is 'always' — bot will respond to all public chat messages")
    return warnings