# Entity: Book

@router.post("/books", status_code=status.HTTP_201_CREATED)
async def create_book(book: BookCreate, author_filter: str = None, title_filter: str = None, db: Session = Depends(get_db)):
    if author_filter:
        author = db.query(Author).filter(Author.name.ilike(f"%{author_filter}%")).first()
        if not author:
            raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Author not found")
        book.author_id = author.id

    if title_filter:
        existing_book = db.query(Book).filter(Book.title.ilike(f"%{title_filter}%")).first()
        if existing_book:
            raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="Book with similar title already exists")

    new_book = Book(**book.dict())
    db.add(new_book)
    db.commit()
    db.refresh(new_book)

    return new_book