import logging
import time

logger = logging.getLogger(__name__)


class MessageDeduplicator:
    def __init__(self, max_size: int = 10000, ttl_seconds: int = 300):
        self._cache: dict[str, float] = {}
        self._max_size = max_size
        self._ttl_seconds = ttl_seconds

    def is_duplicate(self, message_id: str) -> bool:
        if not message_id:
            return False

        self._evict_expired()

        if message_id in self._cache:
            return True

        self._cache[message_id] = time.monotonic()
        self._trim_if_needed()
        return False

    def _evict_expired(self):
        now = time.monotonic()
        expired = [mid for mid, ts in self._cache.items() if now - ts > self._ttl_seconds]
        for mid in expired:
            del self._cache[mid]

    def _trim_if_needed(self):
        if len(self._cache) > self._max_size:
            sorted_items = sorted(self._cache.items(), key=lambda x: x[1])
            to_remove = len(self._cache) - self._max_size + 500
            for mid, _ in sorted_items[:to_remove]:
                del self._cache[mid]
            logger.warning("ClickUp dedupe cache trimmed: removed %d entries", to_remove)