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    use bytes::{Bytes, BytesMut};
    use futures::Stream;
    use std::sync::Arc;
    use std::{fmt, mem};

    use context::ActorHttpContext;
    use error::Error;
    use handler::Responder;
    use httprequest::HttpRequest;
    use httpresponse::HttpResponse;

    /// Type represent streaming body
    pub type BodyStream = Box<Stream<Item = Bytes, Error = Error>>;

    /// Represents various types of http message body.
    pub enum Body {
        /// Empty response. `Content-Length` header is set to `0`
        Empty,
        /// Specific response body.
        Binary(Binary),
        /// Unspecified streaming response. Developer is responsible for setting
        /// right `Content-Length` or `Transfer-Encoding` headers.
        Streaming(BodyStream),
        /// Special body type for actor response.
        Actor(Box<ActorHttpContext>),
    }

    /// Represents various types of binary body.
    /// `Content-Length` header is set to length of the body.
    #[derive(Debug, PartialEq)]
    pub enum Binary {
        /// Bytes body
        Bytes(Bytes),
        /// Static slice
        Slice(&'static [u8]),
        /// Shared string body
        #[doc(hidden)]
        SharedString(Arc<String>),
        /// Shared vec body
        SharedVec(Arc<Vec<u8>>),
    }

    impl Body {
        /// Does this body streaming.
        #[inline]
        pub fn is_streaming(&self) -> bool {
            match *self {
                Body::Streaming(_) | Body::Actor(_) => true,
                _ => false,
            }
        }

        /// Is this binary body.
        #[inline]
        pub fn is_binary(&self) -> bool {
            match *self {
                Body::Binary(_) => true,
                _ => false,
            }
        }

        /// Is this binary empy.
        #[inline]
        pub fn is_empty(&self) -> bool {
            match *self {
                Body::Empty => true,
                _ => false,
            }
        }

        /// Create body from slice (copy)
        pub fn from_slice(s: &[u8]) -> Body {
            Body::Binary(Binary::Bytes(Bytes::from(s)))
        }

        /// Is this binary body.
        #[inline]
        pub(crate) fn binary(self) -> Binary {
            match self {
                Body::Binary(b) => b,
                _ => panic!(),
            }
        }
    }

    impl PartialEq for Body {
        fn eq(&self, other: &Body) -> bool {
            match *self {
                Body::Empty => match *other {
                    Body::Empty => true,
                    _ => false,
                },
                Body::Binary(ref b) => match *other {
                    Body::Binary(ref b2) => b == b2,
                    _ => false,
                },
                Body::Streaming(_) | Body::Actor(_) => false,
            }
        }
    }

    impl fmt::Debug for Body {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            match *self {
                Body::Empty => write!(f, "Body::Empty"),
                Body::Binary(ref b) => write!(f, "Body::Binary({:?})", b),
                Body::Streaming(_) => write!(f, "Body::Streaming(_)"),
                Body::Actor(_) => write!(f, "Body::Actor(_)"),
            }
        }
    }

    impl<T> From<T> for Body
    where
        T: Into<Binary>,
    {
        fn from(b: T) -> Body {
            Body::Binary(b.into())
        }
    }

    impl From<Box<ActorHttpContext>> for Body {
        fn from(ctx: Box<ActorHttpContext>) -> Body {
            Body::Actor(ctx)
        }
    }

    impl Binary {
        #[inline]
        /// Returns `true` if body is empty
        pub fn is_empty(&self) -> bool {
            self.len() == 0
        }

        #[inline]
        /// Length of body in bytes
        pub fn len(&self) -> usize {
            match *self {
                Binary::Bytes(ref bytes) => bytes.len(),
                Binary::Slice(slice) => slice.len(),
                Binary::SharedString(ref s) => s.len(),
                Binary::SharedVec(ref s) => s.len(),
            }
        }

        /// Create binary body from slice
        pub fn from_slice(s: &[u8]) -> Binary {
            Binary::Bytes(Bytes::from(s))
        }

        /// Convert Binary to a Bytes instance
        pub fn take(&mut self) -> Bytes {
            mem::replace(self, Binary::Slice(b"")).into()
        }
    }

    impl Clone for Binary {
        fn clone(&self) -> Binary {
            match *self {
                Binary::Bytes(ref bytes) => Binary::Bytes(bytes.clone()),
                Binary::Slice(slice) => Binary::Bytes(Bytes::from(slice)),
                Binary::SharedString(ref s) => Binary::SharedString(s.clone()),
                Binary::SharedVec(ref s) => Binary::SharedVec(s.clone()),
            }
        }
    }

    impl Into<Bytes> for Binary {
        fn into(self) -> Bytes {
            match self {
                Binary::Bytes(bytes) => bytes,
                Binary::Slice(slice) => Bytes::from(slice),
                Binary::SharedString(s) => Bytes::from(s.as_str()),
                Binary::SharedVec(s) => Bytes::from(AsRef::<[u8]>::as_ref(s.as_ref())),
            }
        }
    }

    impl From<&'static str> for Binary {
        fn from(s: &'static str) -> Binary {
            Binary::Slice(s.as_ref())
        }
    }

    impl From<&'static [u8]> for Binary {
        fn from(s: &'static [u8]) -> Binary {
            Binary::Slice(s)
        }
    }

    impl From<Vec<u8>> for Binary {
        fn from(vec: Vec<u8>) -> Binary {
            Binary::Bytes(Bytes::from(vec))
        }
    }

    impl From<String> for Binary {
        fn from(s: String) -> Binary {
            Binary::Bytes(Bytes::from(s))
        }
    }

    impl<'a> From<&'a String> for Binary {
        fn from(s: &'a String) -> Binary {
            Binary::Bytes(Bytes::from(AsRef::<[u8]>::as_ref(&s)))
        }
    }

    impl From<Bytes> for Binary {
        fn from(s: Bytes) -> Binary {
            Binary::Bytes(s)
        }
    }

    impl From<BytesMut> for Binary {
        fn from(s: BytesMut) -> Binary {
            Binary::Bytes(s.freeze())
        }
    }

    impl From<Arc<String>> for Binary {
        fn from(body: Arc<String>) -> Binary {
            Binary::SharedString(body)
        }
    }

    impl<'a> From<&'a Arc<String>> for Binary {
        fn from(body: &'a Arc<String>) -> Binary {
            Binary::SharedString(Arc::clone(body))
        }
    }

    impl From<Arc<Vec<u8>>> for Binary {
        fn from(body: Arc<Vec<u8>>) -> Binary {
            Binary::SharedVec(body)
        }
    }

    impl<'a> From<&'a Arc<Vec<u8>>> for Binary {
        fn from(body: &'a Arc<Vec<u8>>) -> Binary {
            Binary::SharedVec(Arc::clone(body))
        }
    }

    impl AsRef<[u8]> for Binary {
        #[inline]
        fn as_ref(&self) -> &[u8] {
            match *self {
                Binary::Bytes(ref bytes) => bytes.as_ref(),
                Binary::Slice(slice) => slice,
                Binary::SharedString(ref s) => s.as_bytes(),
                Binary::SharedVec(ref s) => s.as_ref().as_ref(),
            }
        }
    }

    impl Responder for Binary {
        type Item = HttpResponse;
        type Error = Error;

        fn respond_to<S>(self, req: &HttpRequest<S>) -> Result<HttpResponse, Error> {
            Ok(HttpResponse::build_from(req)
                .content_type("application/octet-stream")
                .body(self))
        }
    }

    #[cfg(test)]
    mod tests {
        use super::*;

        #[test]
        fn test_body_is_streaming() {
            assert_eq!(Body::Empty.is_streaming(), false);
            assert_eq!(Body::Binary(Binary::from("")).is_streaming(), false);
        }

        #[test]
        fn test_is_empty() {
            assert_eq!(Binary::from("").is_empty(), true);
            assert_eq!(Binary::from("test").is_empty(), false);
        }

        #[test]
        fn test_static_str() {
            assert_eq!(Binary::from("test").len(), 4);
            assert_eq!(Binary::from("test").as_ref(), b"test");
        }

        #[test]
        fn test_static_bytes() {
            assert_eq!(Binary::from(b"test".as_ref()).len(), 4);
            assert_eq!(Binary::from(b"test".as_ref()).as_ref(), b"test");
            assert_eq!(Binary::from_slice(b"test".as_ref()).len(), 4);
            assert_eq!(Binary::from_slice(b"test".as_ref()).as_ref(), b"test");
        }

        #[test]
        fn test_vec() {
            assert_eq!(Binary::from(Vec::from("test")).len(), 4);
            assert_eq!(Binary::from(Vec::from("test")).as_ref(), b"test");
        }

        #[test]
        fn test_bytes() {
            assert_eq!(Binary::from(Bytes::from("test")).len(), 4);
            assert_eq!(Binary::from(Bytes::from("test")).as_ref(), b"test");
        }

        #[test]
        fn test_arc_string() {
            let b = Arc::new("test".to_owned());
            assert_eq!(Binary::from(b.clone()).len(), 4);
            assert_eq!(Binary::from(b.clone()).as_ref(), b"test");
            assert_eq!(Binary::from(&b).len(), 4);
            assert_eq!(Binary::from(&b).as_ref(), b"test");
        }

        #[test]
        fn test_string() {
            let b = "test".to_owned();
            assert_eq!(Binary::from(b.clone()).len(), 4);
            assert_eq!(Binary::from(b.clone()).as_ref(), b"test");
            assert_eq!(Binary::from(&b).len(), 4);
            assert_eq!(Binary::from(&b).as_ref(), b"test");
        }

        #[test]
        fn test_shared_vec() {
            let b = Arc::new(Vec::from(&b"test"[..]));
            assert_eq!(Binary::from(b.clone()).len(), 4);
            assert_eq!(Binary::from(b.clone()).as_ref(), &b"test"[..]);
            assert_eq!(Binary::from(&b).len(), 4);
            assert_eq!(Binary::from(&b).as_ref(), &b"test"[..]);
        }

        #[test]
        fn test_bytes_mut() {
            let b = BytesMut::from("test");
            assert_eq!(Binary::from(b.clone()).len(), 4);
            assert_eq!(Binary::from(b).as_ref(), b"test");
        }

        #[test]
        fn test_binary_into() {
            let bytes = Bytes::from_static(b"test");
            let b: Bytes = Binary::from("test").into();
            assert_eq!(b, bytes);
            let b: Bytes = Binary::from(bytes.clone()).into();
            assert_eq!(b, bytes);
        }
    }

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