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    #![cfg_attr(
        feature = "cargo-clippy",
        allow(clippy::redundant_field_names)
    )]

    use std::{cmp, io};

    use bytes::{Bytes, BytesMut};
    use futures::{Async, Poll};
    use http2::server::SendResponse;
    use http2::{Reason, SendStream};
    use modhttp::Response;

    use super::helpers;
    use super::message::Request;
    use super::output::{Output, ResponseInfo, ResponseLength};
    use super::settings::ServiceConfig;
    use super::{Writer, WriterState, MAX_WRITE_BUFFER_SIZE};
    use body::{Binary, Body};
    use header::ContentEncoding;
    use http::header::{
        HeaderValue, CONNECTION, CONTENT_ENCODING, CONTENT_LENGTH, DATE, TRANSFER_ENCODING,
    };
    use http::{HttpTryFrom, Method, Version};
    use httpresponse::HttpResponse;

    const CHUNK_SIZE: usize = 16_384;

    bitflags! {
        struct Flags: u8 {
            const STARTED = 0b0000_0001;
            const DISCONNECTED = 0b0000_0010;
            const EOF = 0b0000_0100;
            const RESERVED = 0b0000_1000;
        }
    }

    pub(crate) struct H2Writer<H: 'static> {
        respond: SendResponse<Bytes>,
        stream: Option<SendStream<Bytes>>,
        flags: Flags,
        written: u64,
        buffer: Output,
        buffer_capacity: usize,
        settings: ServiceConfig<H>,
    }

    impl<H: 'static> H2Writer<H> {
        pub fn new(respond: SendResponse<Bytes>, settings: ServiceConfig<H>) -> H2Writer<H> {
            H2Writer {
                stream: None,
                flags: Flags::empty(),
                written: 0,
                buffer: Output::Buffer(settings.get_bytes()),
                buffer_capacity: 0,
                respond,
                settings,
            }
        }

        pub fn reset(&mut self, reason: Reason) {
            if let Some(mut stream) = self.stream.take() {
                stream.send_reset(reason)
            }
        }
    }

    impl<H: 'static> Drop for H2Writer<H> {
        fn drop(&mut self) {
            self.settings.release_bytes(self.buffer.take());
        }
    }

    impl<H: 'static> Writer for H2Writer<H> {
        fn written(&self) -> u64 {
            self.written
        }

        #[inline]
        fn set_date(&mut self) {
            self.settings.set_date(self.buffer.as_mut(), true)
        }

        #[inline]
        fn buffer(&mut self) -> &mut BytesMut {
            self.buffer.as_mut()
        }

        fn start(
            &mut self, req: &Request, msg: &mut HttpResponse, encoding: ContentEncoding,
        ) -> io::Result<WriterState> {
            // prepare response
            self.flags.insert(Flags::STARTED);
            let mut info = ResponseInfo::new(req.inner.method == Method::HEAD);
            self.buffer.for_server(&mut info, &req.inner, msg, encoding);

            let mut has_date = false;
            let mut resp = Response::new(());
            let mut len_is_set = false;
            *resp.status_mut() = msg.status();
            *resp.version_mut() = Version::HTTP_2;
            for (key, value) in msg.headers().iter() {
                match *key {
                    // http2 specific
                    CONNECTION | TRANSFER_ENCODING => continue,
                    CONTENT_ENCODING => if encoding != ContentEncoding::Identity {
                        continue;
                    },
                    CONTENT_LENGTH => match info.length {
                        ResponseLength::None => (),
                        ResponseLength::Zero => {
                            len_is_set = true;
                        }
                        _ => continue,
                    },
                    DATE => has_date = true,
                    _ => (),
                }
                resp.headers_mut().append(key, value.clone());
            }

            // set date header
            if !has_date {
                let mut bytes = BytesMut::with_capacity(29);
                self.settings.set_date(&mut bytes, false);
                resp.headers_mut()
                    .insert(DATE, HeaderValue::try_from(bytes.freeze()).unwrap());
            }

            // content length
            match info.length {
                ResponseLength::Zero => {
                    if !len_is_set {
                        resp.headers_mut()
                            .insert(CONTENT_LENGTH, HeaderValue::from_static("0"));
                    }
                    self.flags.insert(Flags::EOF);
                }
                ResponseLength::Length(len) => {
                    let mut val = BytesMut::new();
                    helpers::convert_usize(len, &mut val);
                    let l = val.len();
                    resp.headers_mut().insert(
                        CONTENT_LENGTH,
                        HeaderValue::try_from(val.split_to(l - 2).freeze()).unwrap(),
                    );
                }
                ResponseLength::Length64(len) => {
                    let l = format!("{}", len);
                    resp.headers_mut()
                        .insert(CONTENT_LENGTH, HeaderValue::try_from(l.as_str()).unwrap());
                }
                ResponseLength::None => {
                    self.flags.insert(Flags::EOF);
                }
                _ => (),
            }
            if let Some(ce) = info.content_encoding {
                resp.headers_mut()
                    .insert(CONTENT_ENCODING, HeaderValue::try_from(ce).unwrap());
            }

            trace!("Response: {:?}", resp);

            match self
                .respond
                .send_response(resp, self.flags.contains(Flags::EOF))
            {
                Ok(stream) => self.stream = Some(stream),
                Err(_) => return Err(io::Error::new(io::ErrorKind::Other, "err")),
            }

            let body = msg.replace_body(Body::Empty);
            if let Body::Binary(bytes) = body {
                if bytes.is_empty() {
                    Ok(WriterState::Done)
                } else {
                    self.flags.insert(Flags::EOF);
                    self.buffer.write(bytes.as_ref())?;
                    if let Some(ref mut stream) = self.stream {
                        self.flags.insert(Flags::RESERVED);
                        stream.reserve_capacity(cmp::min(self.buffer.len(), CHUNK_SIZE));
                    }
                    Ok(WriterState::Pause)
                }
            } else {
                msg.replace_body(body);
                self.buffer_capacity = msg.write_buffer_capacity();
                Ok(WriterState::Done)
            }
        }

        fn write(&mut self, payload: &Binary) -> io::Result<WriterState> {
            if !self.flags.contains(Flags::DISCONNECTED) {
                if self.flags.contains(Flags::STARTED) {
                    // TODO: add warning, write after EOF
                    self.buffer.write(payload.as_ref())?;
                } else {
                    // might be response for EXCEPT
                    error!("Not supported");
                }
            }

            if self.buffer.len() > self.buffer_capacity {
                Ok(WriterState::Pause)
            } else {
                Ok(WriterState::Done)
            }
        }

        fn write_eof(&mut self) -> io::Result<WriterState> {
            self.flags.insert(Flags::EOF);
            if !self.buffer.write_eof()? {
                Err(io::Error::new(
                    io::ErrorKind::Other,
                    "Last payload item, but eof is not reached",
                ))
            } else if self.buffer.len() > MAX_WRITE_BUFFER_SIZE {
                Ok(WriterState::Pause)
            } else {
                Ok(WriterState::Done)
            }
        }

        fn poll_completed(&mut self, _shutdown: bool) -> Poll<(), io::Error> {
            if !self.flags.contains(Flags::STARTED) {
                return Ok(Async::NotReady);
            }

            if let Some(ref mut stream) = self.stream {
                // reserve capacity
                if !self.flags.contains(Flags::RESERVED) && !self.buffer.is_empty() {
                    self.flags.insert(Flags::RESERVED);
                    stream.reserve_capacity(cmp::min(self.buffer.len(), CHUNK_SIZE));
                }

                loop {
                    match stream.poll_capacity() {
                        Ok(Async::NotReady) => return Ok(Async::NotReady),
                        Ok(Async::Ready(None)) => return Ok(Async::Ready(())),
                        Ok(Async::Ready(Some(cap))) => {
                            let len = self.buffer.len();
                            let bytes = self.buffer.split_to(cmp::min(cap, len));
                            let eof =
                                self.buffer.is_empty() && self.flags.contains(Flags::EOF);
                            self.written += bytes.len() as u64;

                            if let Err(e) = stream.send_data(bytes.freeze(), eof) {
                                return Err(io::Error::new(io::ErrorKind::Other, e));
                            } else if !self.buffer.is_empty() {
                                let cap = cmp::min(self.buffer.len(), CHUNK_SIZE);
                                stream.reserve_capacity(cap);
                            } else {
                                if eof {
                                    stream.reserve_capacity(0);
                                    continue;
                                }
                                self.flags.remove(Flags::RESERVED);
                                return Ok(Async::Ready(()));
                            }
                        }
                        Err(e) => return Err(io::Error::new(io::ErrorKind::Other, e)),
                    }
                }
            }
            Ok(Async::Ready(()))
        }
    }

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