use std::{
    pin::Pin,
    task::{Context, Poll},
};

use io_uring::opcode::Nop;

use crate::ring_op::RingOp;

pub fn no_op() -> NoOp {
    Default::default()
}

#[derive(Default)]
pub struct NoOp {
    ring_op: RingOp,
}

impl Future for NoOp {
    type Output = ();

    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        match self
            .ring_op
            .submit_and_poll(cx, |user_data| Nop::new().build().user_data(user_data))
        {
            Poll::Ready(complete) => {
                debug_assert_eq!(complete.result, 0);
                Poll::Ready(())
            }
            Poll::Pending => Poll::Pending,
        }
    }
}