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//! HTTP/2 protocol.

use std::{
    pin::Pin,
    task::{Context, Poll},
};

use bytes::Bytes;
use futures_core::{ready, Stream};
use h2::RecvStream;

mod dispatcher;
mod service;

pub use self::dispatcher::Dispatcher;
pub use self::service::H2Service;
use crate::error::PayloadError;

/// HTTP/2 peer stream.
pub struct Payload {
    stream: RecvStream,
}

impl Payload {
    pub(crate) fn new(stream: RecvStream) -> Self {
        Self { stream }
    }
}

impl Stream for Payload {
    type Item = Result<Bytes, PayloadError>;

    fn poll_next(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
    ) -> Poll<Option<Self::Item>> {
        let this = self.get_mut();

        match ready!(Pin::new(&mut this.stream).poll_data(cx)) {
            Some(Ok(chunk)) => {
                let len = chunk.len();

                match this.stream.flow_control().release_capacity(len) {
                    Ok(()) => Poll::Ready(Some(Ok(chunk))),
                    Err(err) => Poll::Ready(Some(Err(err.into()))),
                }
            }
            Some(Err(err)) => Poll::Ready(Some(Err(err.into()))),
            None => Poll::Ready(None),
        }
    }
}