use crossbeam_channel::{Receiver, bounded};

#[derive(Debug)]
pub struct AsyncJob<T> {
    receiver: Receiver<T>,
}

impl<T> AsyncJob<T> {
    pub fn wait(self) -> T {
        self.receiver
            .recv()
            .expect("AsyncJob worker thread panicked or disconnected")
    }

    pub fn is_ready(&self) -> bool {
        !self.receiver.is_empty()
    }
}

pub fn run_async<F, T>(func: F) -> AsyncJob<T>
where
    F: FnOnce() -> T + Send + 'static,
    T: Send + 'static,
{
    let (tx, rx) = bounded(1);

    rayon::spawn(move || {
        let result = func();
        let _ = tx.send(result);
    });

    AsyncJob { receiver: rx }
}