from typing import Optional
from uuid import UUID
from sqlalchemy.orm import Session
from models.book import Book
from schemas.book import BookCreate

def create_book(db: Session, book_data: BookCreate) -> Book:
    """
    Creates a new book in the database.

    Args:
        db (Session): The database session.
        book_data (BookCreate): The data for the book to create.

    Returns:
        Book: The newly created book object.
    """
    db_book = Book(**book_data.dict())
    db.add(db_book)
    db.commit()
    db.refresh(db_book)
    return db_book

def get_book_by_id(db: Session, book_id: UUID) -> Optional[Book]:
    """
    Retrieves a single book by its ID.

    Args:
        db (Session): The database session.
        book_id (UUID): The ID of the book to retrieve.

    Returns:
        Optional[Book]: The book object if found, otherwise None.
    """
    return db.query(Book).filter(Book.id == book_id).first()