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use futures::{Async, Poll};

use actor::Actor;
use fut::{ActorFuture, ActorStream};

/// A combinator used to convert stream into a future, future resolves
/// when stream completes.
///
/// This structure is produced by the `ActorStream::finish` method.
#[derive(Debug)]
#[must_use = "streams do nothing unless polled"]
pub struct StreamFinish<S> (S);

pub fn new<S>(s: S) -> StreamFinish<S> where S: ActorStream {
    StreamFinish(s)
}

impl<S> ActorFuture for StreamFinish<S> where S: ActorStream
{
    type Item = ();
    type Error = S::Error;
    type Actor = S::Actor;

    fn poll(&mut self,
            act: &mut S::Actor,
            ctx: &mut <S::Actor as Actor>::Context) -> Poll<(), S::Error>
    {
        loop {
            match self.0.poll(act, ctx) {
                Ok(Async::NotReady) => return Ok(Async::NotReady),
                Ok(Async::Ready(None)) => return Ok(Async::Ready(())),
                Ok(Async::Ready(Some(_))) => (),
                Err(err) => return Err(err),
            };
        }
    }
}