from sqlmodel import Session, select

from app.models import Dish, DishShare


def dish_for_barcode(session: Session, barcode: str) -> Dish | None:
    if not barcode.startswith("dish-"):
        return None
    return session.exec(select(Dish).where(Dish.product_barcode == barcode)).first()


def user_can_access_dish(session: Session, dish: Dish, user_id: int) -> bool:
    if dish.user_id == user_id:
        return True
    return (
        session.exec(
            select(DishShare).where(
                DishShare.dish_id == dish.id,
                DishShare.shared_with_user_id == user_id,
            )
        ).first()
        is not None
    )


def product_barcode_accessible(session: Session, barcode: str, user_id: int) -> bool:
    dish = dish_for_barcode(session, barcode)
    if dish is None:
        return True
    return user_can_access_dish(session, dish, user_id)