from fastapi import APIRouter, HTTPException
import uuid

books = []  # In-memory storage

router = APIRouter()

@router.post("/books")
async def add_book(
    title: str = "Sample Book",
    author: str = "John Doe",
    isbn: str = "1234567890"
):
    """Add book endpoint"""
    if any(b["isbn"] == isbn for b in books):
        raise HTTPException(status_code=400, detail="Book already exists")

    book_id = str(uuid.uuid4())
    books.append({
        "id": book_id,
        "title": title,
        "author": author,
        "isbn": isbn,
        "disabled": False
    })

    return {
        "message": "Book added successfully",
        "book_id": book_id,
        "title": title,
        "next_steps": [
            "Add to catalog",
            "Update inventory"
        ]
    }