import logging
import re

logger = logging.getLogger(__name__)

_MENTION_PATTERN = re.compile(r"@(\w+)")


def extract_mentions_from_text(text: str) -> list[str]:
    return [m.group(1) for m in _MENTION_PATTERN.finditer(text)]


def build_mention_text(user_name: str, user_id: str | None = None) -> str:
    return f"@{user_name}"