const listener = new EventSource("/app/listen");

listener.onmessage = (e) => {
    let data = JSON.parse(e.data);
    console.log(data);
    
    switch (data.type) {
        case "pong":
            console.log("pong!");
            break;
        case "add_book":
            viewAddBook(data.book);
            break;
        case "update_book":
            viewUpdateBook(data.book);
            break;
        case "delete_book":
            viewDeleteBook(data.book);
            break;
        default:
            console.log("Unexpected response from SSE:", data);
    }
};