import uuid
from typing import Any, Type

from sqlalchemy.orm import Session


def short_id(prefix: str, size: int = 8) -> str:
    return f"{prefix}_{uuid.uuid4().hex[:size]}"


def unique_short_id(prefix: str, db: Session, model_cls: Type[Any], size: int = 8) -> str:
    for _ in range(10):
        candidate = short_id(prefix, size=size)
        exists = db.query(model_cls.id).filter(model_cls.id == candidate).first()
        if not exists:
            return candidate
    raise RuntimeError(f"failed to generate unique id for {model_cls.__name__}")