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    extern crate actix;

    use futures::sync::oneshot;
    use futures::sync::oneshot::Sender;
    use futures::{Async, Future, Poll};
    use smallvec::SmallVec;
    use std::marker::PhantomData;

    use self::actix::dev::{
        AsyncContextParts, ContextFut, ContextParts, Envelope, Mailbox, ToEnvelope,
    };
    use self::actix::fut::ActorFuture;
    use self::actix::{
        Actor, ActorContext, ActorState, Addr, AsyncContext, Handler, Message, SpawnHandle,
    };

    use body::{Binary, Body};
    use error::{Error, ErrorInternalServerError};
    use httprequest::HttpRequest;

    pub trait ActorHttpContext: 'static {
        fn disconnected(&mut self);
        fn poll(&mut self) -> Poll<Option<SmallVec<[Frame; 4]>>, Error>;
    }

    #[derive(Debug)]
    pub enum Frame {
        Chunk(Option<Binary>),
        Drain(oneshot::Sender<()>),
    }

    impl Frame {
        pub fn len(&self) -> usize {
            match *self {
                Frame::Chunk(Some(ref bin)) => bin.len(),
                _ => 0,
            }
        }
    }

    /// Execution context for http actors
    pub struct HttpContext<A, S = ()>
    where
        A: Actor<Context = HttpContext<A, S>>,
    {
        inner: ContextParts<A>,
        stream: Option<SmallVec<[Frame; 4]>>,
        request: HttpRequest<S>,
        disconnected: bool,
    }

    impl<A, S> ActorContext for HttpContext<A, S>
    where
        A: Actor<Context = Self>,
    {
        fn stop(&mut self) {
            self.inner.stop();
        }
        fn terminate(&mut self) {
            self.inner.terminate()
        }
        fn state(&self) -> ActorState {
            self.inner.state()
        }
    }

    impl<A, S> AsyncContext<A> for HttpContext<A, S>
    where
        A: Actor<Context = Self>,
    {
        #[inline]
        fn spawn<F>(&mut self, fut: F) -> SpawnHandle
        where
            F: ActorFuture<Item = (), Error = (), Actor = A> + 'static,
        {
            self.inner.spawn(fut)
        }
        #[inline]
        fn wait<F>(&mut self, fut: F)
        where
            F: ActorFuture<Item = (), Error = (), Actor = A> + 'static,
        {
            self.inner.wait(fut)
        }
        #[doc(hidden)]
        #[inline]
        fn waiting(&self) -> bool {
            self.inner.waiting()
                || self.inner.state() == ActorState::Stopping
                || self.inner.state() == ActorState::Stopped
        }
        #[inline]
        fn cancel_future(&mut self, handle: SpawnHandle) -> bool {
            self.inner.cancel_future(handle)
        }
        #[inline]
        fn address(&self) -> Addr<A> {
            self.inner.address()
        }
    }

    impl<A, S: 'static> HttpContext<A, S>
    where
        A: Actor<Context = Self>,
    {
        #[inline]
        /// Create a new HTTP Context from a request and an actor
        pub fn create(req: HttpRequest<S>, actor: A) -> Body {
            let mb = Mailbox::default();
            let ctx = HttpContext {
                inner: ContextParts::new(mb.sender_producer()),
                stream: None,
                request: req,
                disconnected: false,
            };
            Body::Actor(Box::new(HttpContextFut::new(ctx, actor, mb)))
        }

        /// Create a new HTTP Context
        pub fn with_factory<F>(req: HttpRequest<S>, f: F) -> Body
        where
            F: FnOnce(&mut Self) -> A + 'static,
        {
            let mb = Mailbox::default();
            let mut ctx = HttpContext {
                inner: ContextParts::new(mb.sender_producer()),
                stream: None,
                request: req,
                disconnected: false,
            };

            let act = f(&mut ctx);
            Body::Actor(Box::new(HttpContextFut::new(ctx, act, mb)))
        }
    }

    impl<A, S> HttpContext<A, S>
    where
        A: Actor<Context = Self>,
    {
        /// Shared application state
        #[inline]
        pub fn state(&self) -> &S {
            self.request.state()
        }

        /// Incoming request
        #[inline]
        pub fn request(&mut self) -> &mut HttpRequest<S> {
            &mut self.request
        }

        /// Write payload
        #[inline]
        pub fn write<B: Into<Binary>>(&mut self, data: B) {
            if !self.disconnected {
                self.add_frame(Frame::Chunk(Some(data.into())));
            } else {
                warn!("Trying to write to disconnected response");
            }
        }

        /// Indicate end of streaming payload. Also this method calls `Self::close`.
        #[inline]
        pub fn write_eof(&mut self) {
            self.add_frame(Frame::Chunk(None));
        }

        /// Returns drain future
        pub fn drain(&mut self) -> Drain<A> {
            let (tx, rx) = oneshot::channel();
            self.add_frame(Frame::Drain(tx));
            Drain::new(rx)
        }

        /// Check if connection still open
        #[inline]
        pub fn connected(&self) -> bool {
            !self.disconnected
        }

        #[inline]
        fn add_frame(&mut self, frame: Frame) {
            if self.stream.is_none() {
                self.stream = Some(SmallVec::new());
            }
            if let Some(s) = self.stream.as_mut() {
                s.push(frame)
            }
        }

        /// Handle of the running future
        ///
        /// SpawnHandle is the handle returned by `AsyncContext::spawn()` method.
        pub fn handle(&self) -> SpawnHandle {
            self.inner.curr_handle()
        }
    }

    impl<A, S> AsyncContextParts<A> for HttpContext<A, S>
    where
        A: Actor<Context = Self>,
    {
        fn parts(&mut self) -> &mut ContextParts<A> {
            &mut self.inner
        }
    }

    struct HttpContextFut<A, S>
    where
        A: Actor<Context = HttpContext<A, S>>,
    {
        fut: ContextFut<A, HttpContext<A, S>>,
    }

    impl<A, S> HttpContextFut<A, S>
    where
        A: Actor<Context = HttpContext<A, S>>,
    {
        fn new(ctx: HttpContext<A, S>, act: A, mailbox: Mailbox<A>) -> Self {
            let fut = ContextFut::new(ctx, act, mailbox);
            HttpContextFut { fut }
        }
    }

    impl<A, S> ActorHttpContext for HttpContextFut<A, S>
    where
        A: Actor<Context = HttpContext<A, S>>,
        S: 'static,
    {
        #[inline]
        fn disconnected(&mut self) {
            self.fut.ctx().disconnected = true;
            self.fut.ctx().stop();
        }

        fn poll(&mut self) -> Poll<Option<SmallVec<[Frame; 4]>>, Error> {
            if self.fut.alive() {
                match self.fut.poll() {
                    Ok(Async::NotReady) | Ok(Async::Ready(())) => (),
                    Err(_) => return Err(ErrorInternalServerError("error")),
                }
            }

            // frames
            if let Some(data) = self.fut.ctx().stream.take() {
                Ok(Async::Ready(Some(data)))
            } else if self.fut.alive() {
                Ok(Async::NotReady)
            } else {
                Ok(Async::Ready(None))
            }
        }
    }

    impl<A, M, S> ToEnvelope<A, M> for HttpContext<A, S>
    where
        A: Actor<Context = HttpContext<A, S>> + Handler<M>,
        M: Message + Send + 'static,
        M::Result: Send,
    {
        fn pack(msg: M, tx: Option<Sender<M::Result>>) -> Envelope<A> {
            Envelope::new(msg, tx)
        }
    }

    /// Consume a future
    pub struct Drain<A> {
        fut: oneshot::Receiver<()>,
        _a: PhantomData<A>,
    }

    impl<A> Drain<A> {
        /// Create a drain from a future
        pub fn new(fut: oneshot::Receiver<()>) -> Self {
            Drain {
                fut,
                _a: PhantomData,
            }
        }
    }

    impl<A: Actor> ActorFuture for Drain<A> {
        type Item = ();
        type Error = ();
        type Actor = A;

        #[inline]
        fn poll(
            &mut self, _: &mut A, _: &mut <Self::Actor as Actor>::Context,
        ) -> Poll<Self::Item, Self::Error> {
            self.fut.poll().map_err(|_| ())
        }
    }

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