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use futures::{Async, Poll, Stream};
use lapin::Consumer as ConsumerInner;
use log::trace;

use crate::{confirmation::Watcher, message::Delivery, Error};

#[derive(Clone, Debug)]
pub struct Consumer(pub(crate) ConsumerInner);

impl Stream for Consumer {
    type Item = Delivery;
    type Error = Error;

    fn poll(&mut self) -> Poll<Option<Delivery>, Error> {
        trace!("consumer poll; polling transport");
        let mut inner = self.0.inner();
        trace!(
            "consumer poll; acquired inner lock, consumer_tag={}",
            inner.tag()
        );
        if !inner.has_task() {
            inner.set_task(Box::new(Watcher::default()));
        }
        if let Some(delivery) = inner.next_delivery() {
            trace!(
                "delivery; consumer_tag={}, delivery_tag={:?}",
                inner.tag(),
                delivery.delivery_tag
            );
            Ok(Async::Ready(Some(delivery)))
        } else if inner.canceled() {
            trace!("consumer canceled; consumer_tag={}", inner.tag());
            if let Some(error) = inner.error() {
                Err(error)
            } else {
                Ok(Async::Ready(None))
            }
        } else {
            trace!("delivery; status=NotReady, consumer_tag={}", inner.tag());
            Ok(Async::NotReady)
        }
    }
}