from typing import Optional

from beanie import PydanticObjectId
from fastapi import HTTPException


def parse_object_id(value: str) -> PydanticObjectId:
    """Parse a string to PydanticObjectId, raising 400 on invalid format."""
    try:
        return PydanticObjectId(value)
    except Exception:
        raise HTTPException(status_code=400, detail="无效的ID格式")


def mask_name(name: Optional[str]) -> str:
    """隐私脱敏：姓名"""
    if not name or len(name) < 2:
        return name or ""
    return name[0] + "*" * (len(name) - 1)