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    use std::fmt;

    use bytes::{BufMut, Bytes};

    use crate::frame::{self, Error, Head, Kind, Reason, StreamId};

    #[derive(Clone, Eq, PartialEq)]
    pub struct GoAway {
        last_stream_id: StreamId,
        error_code: Reason,
        #[allow(unused)]
        debug_data: Bytes,
    }

    impl GoAway {
        pub fn new(last_stream_id: StreamId, reason: Reason) -> Self {
            GoAway {
                last_stream_id,
                error_code: reason,
                debug_data: Bytes::new(),
            }
        }

        pub fn last_stream_id(&self) -> StreamId {
            self.last_stream_id
        }

        pub fn reason(&self) -> Reason {
            self.error_code
        }

        #[cfg(feature = "unstable")]
        pub fn debug_data(&self) -> &[u8] {
            &self.debug_data
        }

        pub fn load(payload: &[u8]) -> Result<GoAway, Error> {
            if payload.len() < 8 {
                return Err(Error::BadFrameSize);
            }

            let (last_stream_id, _) = StreamId::parse(&payload[..4]);
            let error_code = unpack_octets_4!(payload, 4, u32);
            let debug_data = Bytes::copy_from_slice(&payload[8..]);

            Ok(GoAway {
                last_stream_id,
                error_code: error_code.into(),
                debug_data,
            })
        }

        pub fn encode<B: BufMut>(&self, dst: &mut B) {
            tracing::trace!("encoding GO_AWAY; code={:?}", self.error_code);
            let head = Head::new(Kind::GoAway, 0, StreamId::zero());
            head.encode(8, dst);
            dst.put_u32(self.last_stream_id.into());
            dst.put_u32(self.error_code.into());
        }
    }

    impl<B> From<GoAway> for frame::Frame<B> {
        fn from(src: GoAway) -> Self {
            frame::Frame::GoAway(src)
        }
    }

    impl fmt::Debug for GoAway {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            let mut builder = f.debug_struct("GoAway");
            builder.field("error_code", &self.error_code);
            builder.field("last_stream_id", &self.last_stream_id);

            if !self.debug_data.is_empty() {
                builder.field("debug_data", &self.debug_data);
            }

            builder.finish()
        }
    }