use crate::UErrorBt;
use crossbeam::channel::{self, Receiver, Sender};
use once_cell::sync::OnceCell;

type ChanError = UErrorBt;
static ERR_CHAN: OnceCell<ErrChan> = OnceCell::new();

pub struct ErrChan {
    tx: Sender<ChanError>,
    rx: Receiver<ChanError>,
}

impl ErrChan {
    fn get() -> &'static Self {
        ERR_CHAN.get_or_init(|| {
            let (tx, rx) = channel::bounded(20);
            Self { tx, rx }
        })
    }

    pub fn send(msg: impl Into<UErrorBt>) {
        Self::get().tx.send(msg.into()).unwrap()
    }

    pub fn recv() -> ChanError {
        Self::get().rx.recv().unwrap()
    }
}