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

    use std::io::{self, Write};

    use bytes::{BufMut, BytesMut};
    use futures::{Async, Poll};
    use tokio_io::AsyncWrite;

    use super::helpers;
    use super::output::{Output, ResponseInfo, ResponseLength};
    use super::settings::ServiceConfig;
    use super::Request;
    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::{Method, Version};
    use httpresponse::HttpResponse;

    const AVERAGE_HEADER_SIZE: usize = 30; // totally scientific

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

    pub(crate) struct H1Writer<T: AsyncWrite, H: 'static> {
        flags: Flags,
        stream: T,
        written: u64,
        headers_size: u32,
        buffer: Output,
        buffer_capacity: usize,
        settings: ServiceConfig<H>,
    }

    impl<T: AsyncWrite, H: 'static> H1Writer<T, H> {
        pub fn new(stream: T, settings: ServiceConfig<H>) -> H1Writer<T, H> {
            H1Writer {
                flags: Flags::KEEPALIVE,
                written: 0,
                headers_size: 0,
                buffer: Output::Buffer(settings.get_bytes()),
                buffer_capacity: 0,
                stream,
                settings,
            }
        }

        pub fn get_mut(&mut self) -> &mut T {
            &mut self.stream
        }

        pub fn reset(&mut self) {
            self.written = 0;
            self.flags = Flags::KEEPALIVE;
        }

        pub fn flushed(&mut self) -> bool {
            self.buffer.is_empty()
        }

        pub fn disconnected(&mut self) {
            self.flags.insert(Flags::DISCONNECTED);
        }

        pub fn upgrade(&self) -> bool {
            self.flags.contains(Flags::UPGRADE)
        }

        pub fn keepalive(&self) -> bool {
            self.flags.contains(Flags::KEEPALIVE) && !self.flags.contains(Flags::UPGRADE)
        }

        fn write_data(stream: &mut T, data: &[u8]) -> io::Result<usize> {
            let mut written = 0;
            while written < data.len() {
                match stream.write(&data[written..]) {
                    Ok(0) => {
                        return Err(io::Error::new(io::ErrorKind::WriteZero, ""));
                    }
                    Ok(n) => {
                        written += n;
                    }
                    Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {
                        return Ok(written)
                    }
                    Err(err) => return Err(err),
                }
            }
            Ok(written)
        }
    }

    impl<T: AsyncWrite, H: 'static> Drop for H1Writer<T, H> {
        fn drop(&mut self) {
            if let Some(bytes) = self.buffer.take_option() {
                self.settings.release_bytes(bytes);
            }
        }
    }

    impl<T: AsyncWrite, H: 'static> Writer for H1Writer<T, H> {
        #[inline]
        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 task
            let mut info = ResponseInfo::new(req.inner.method == Method::HEAD);
            self.buffer.for_server(&mut info, &req.inner, msg, encoding);
            if msg.keep_alive().unwrap_or_else(|| req.keep_alive()) {
                self.flags = Flags::STARTED | Flags::KEEPALIVE;
            } else {
                self.flags = Flags::STARTED;
            }

            // Connection upgrade
            let version = msg.version().unwrap_or_else(|| req.inner.version);
            if msg.upgrade() {
                self.flags.insert(Flags::UPGRADE);
                msg.headers_mut()
                    .insert(CONNECTION, HeaderValue::from_static("upgrade"));
            }
            // keep-alive
            else if self.flags.contains(Flags::KEEPALIVE) {
                if version < Version::HTTP_11 {
                    msg.headers_mut()
                        .insert(CONNECTION, HeaderValue::from_static("keep-alive"));
                }
            } else if version >= Version::HTTP_11 {
                msg.headers_mut()
                    .insert(CONNECTION, HeaderValue::from_static("close"));
            }
            let body = msg.replace_body(Body::Empty);

            // render message
            {
                // output buffer
                let mut buffer = self.buffer.as_mut();

                let reason = msg.reason().as_bytes();
                if let Body::Binary(ref bytes) = body {
                    buffer.reserve(
                        256 + msg.headers().len() * AVERAGE_HEADER_SIZE
                            + bytes.len()
                            + reason.len(),
                    );
                } else {
                    buffer.reserve(
                        256 + msg.headers().len() * AVERAGE_HEADER_SIZE + reason.len(),
                    );
                }

                // status line
                helpers::write_status_line(version, msg.status().as_u16(), &mut buffer);
                buffer.extend_from_slice(reason);

                // content length
                let mut len_is_set = true;
                match info.length {
                    ResponseLength::Chunked => {
                        buffer.extend_from_slice(b"\r\ntransfer-encoding: chunked\r\n")
                    }
                    ResponseLength::Length(len) => {
                        helpers::write_content_length(len, &mut buffer)
                    }
                    ResponseLength::Length64(len) => {
                        buffer.extend_from_slice(b"\r\ncontent-length: ");
                        write!(buffer.writer(), "{}", len)?;
                        buffer.extend_from_slice(b"\r\n");
                    }
                    ResponseLength::Zero => {
                        len_is_set = false;
                        buffer.extend_from_slice(b"\r\n");
                    }
                    ResponseLength::None => buffer.extend_from_slice(b"\r\n"),
                }
                if let Some(ce) = info.content_encoding {
                    buffer.extend_from_slice(b"content-encoding: ");
                    buffer.extend_from_slice(ce.as_ref());
                    buffer.extend_from_slice(b"\r\n");
                }

                // write headers
                let mut pos = 0;
                let mut has_date = false;
                let mut remaining = buffer.remaining_mut();
                let mut buf = unsafe { &mut *(buffer.bytes_mut() as *mut [u8]) };
                for (key, value) in msg.headers() {
                    match *key {
                        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;
                        }
                        _ => (),
                    }

                    let v = value.as_ref();
                    let k = key.as_str().as_bytes();
                    let len = k.len() + v.len() + 4;
                    if len > remaining {
                        unsafe {
                            buffer.advance_mut(pos);
                        }
                        pos = 0;
                        buffer.reserve(len);
                        remaining = buffer.remaining_mut();
                        unsafe {
                            buf = &mut *(buffer.bytes_mut() as *mut _);
                        }
                    }

                    buf[pos..pos + k.len()].copy_from_slice(k);
                    pos += k.len();
                    buf[pos..pos + 2].copy_from_slice(b": ");
                    pos += 2;
                    buf[pos..pos + v.len()].copy_from_slice(v);
                    pos += v.len();
                    buf[pos..pos + 2].copy_from_slice(b"\r\n");
                    pos += 2;
                    remaining -= len;
                }
                unsafe {
                    buffer.advance_mut(pos);
                }
                if !len_is_set {
                    buffer.extend_from_slice(b"content-length: 0\r\n")
                }

                // optimized date header, set_date writes \r\n
                if !has_date {
                    self.settings.set_date(&mut buffer, true);
                } else {
                    // msg eof
                    buffer.extend_from_slice(b"\r\n");
                }
                self.headers_size = buffer.len() as u32;
            }

            if let Body::Binary(bytes) = body {
                self.written = bytes.len() as u64;
                self.buffer.write(bytes.as_ref())?;
            } else {
                // capacity, makes sense only for streaming or actor
                self.buffer_capacity = msg.write_buffer_capacity();

                msg.replace_body(body);
            }
            Ok(WriterState::Done)
        }

        fn write(&mut self, payload: &Binary) -> io::Result<WriterState> {
            self.written += payload.len() as u64;
            if !self.flags.contains(Flags::DISCONNECTED) {
                if self.flags.contains(Flags::STARTED) {
                    // shortcut for upgraded connection
                    if self.flags.contains(Flags::UPGRADE) {
                        if self.buffer.is_empty() {
                            let pl: &[u8] = payload.as_ref();
                            let n = match Self::write_data(&mut self.stream, pl) {
                                Err(err) => {
                                    self.disconnected();
                                    return Err(err);
                                }
                                Ok(val) => val,
                            };
                            if n < pl.len() {
                                self.buffer.write(&pl[n..])?;
                                return Ok(WriterState::Done);
                            }
                        } else {
                            self.buffer.write(payload.as_ref())?;
                        }
                    } else {
                        // TODO: add warning, write after EOF
                        self.buffer.write(payload.as_ref())?;
                    }
                } else {
                    // could be response to EXCEPT header
                    self.buffer.write(payload.as_ref())?;
                }
            }

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

        fn write_eof(&mut self) -> io::Result<WriterState> {
            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)
            }
        }

        #[inline]
        fn poll_completed(&mut self, shutdown: bool) -> Poll<(), io::Error> {
            if self.flags.contains(Flags::DISCONNECTED) {
                return Err(io::Error::new(io::ErrorKind::Other, "disconnected"));
            }

            if !self.buffer.is_empty() {
                let written = {
                    match Self::write_data(&mut self.stream, self.buffer.as_ref().as_ref()) {
                        Err(err) => {
                            self.disconnected();
                            return Err(err);
                        }
                        Ok(val) => val,
                    }
                };
                let _ = self.buffer.split_to(written);
                if shutdown && !self.buffer.is_empty()
                    || (self.buffer.len() > self.buffer_capacity)
                {
                    return Ok(Async::NotReady);
                }
            }
            if shutdown {
                self.stream.poll_flush()?;
                self.stream.shutdown()
            } else {
                Ok(self.stream.poll_flush()?)
            }
        }
    }

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