use futures::{AsyncRead, AsyncWrite};
use libp2p_core::muxing::SubstreamBox;
use libp2p_core::Negotiated;
use std::io::{IoSlice, IoSliceMut};
use std::pin::Pin;
use std::task::{Context, Poll};

#[derive(Debug)]
pub struct Stream(Negotiated<SubstreamBox>);

impl Stream {
    pub(crate) fn new(stream: Negotiated<SubstreamBox>) -> Self {
        Self(stream)
    }
}

impl AsyncRead for Stream {
    fn poll_read(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &mut [u8],
    ) -> Poll<std::io::Result<usize>> {
        Pin::new(&mut self.get_mut().0).poll_read(cx, buf)
    }

    fn poll_read_vectored(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        bufs: &mut [IoSliceMut<'_>],
    ) -> Poll<std::io::Result<usize>> {
        Pin::new(&mut self.get_mut().0).poll_read_vectored(cx, bufs)
    }
}

impl AsyncWrite for Stream {
    fn poll_write(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &[u8],
    ) -> Poll<std::io::Result<usize>> {
        Pin::new(&mut self.get_mut().0).poll_write(cx, buf)
    }

    fn poll_write_vectored(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        bufs: &[IoSlice<'_>],
    ) -> Poll<std::io::Result<usize>> {
        Pin::new(&mut self.get_mut().0).poll_write_vectored(cx, bufs)
    }

    fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<std::io::Result<()>> {
        Pin::new(&mut self.get_mut().0).poll_flush(cx)
    }

    fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<std::io::Result<()>> {
        Pin::new(&mut self.get_mut().0).poll_close(cx)
    }
}