use crate::protocol::connection::{ControlChannel, ControlChannelStats};
use async_trait::async_trait;
use futures::stream::SplitSink;
use futures::stream::SplitStream;
use futures::stream::StreamExt;
use futures::stream::TryStreamExt;
use futures::SinkExt;
use mumble_protocol::control::ControlPacket;
use mumble_protocol::control::ServerControlCodec;
use mumble_protocol::voice::{Clientbound, Serverbound};
use std::io::Error as IoError;
use std::io::Error;
use std::io::ErrorKind;
use std::sync::atomic::{AtomicU32, Ordering};
use tokio::net::TcpStream;
use tokio::sync::Mutex;
use tokio_rustls::server::TlsStream;
use tokio_util::codec::Decoder;
use tokio_util::codec::Framed;

pub struct TcpControlChannel {
    received: AtomicU32,
    sink: Mutex<
        SplitSink<Framed<TlsStream<TcpStream>, ServerControlCodec>, ControlPacket<Clientbound>>,
    >,
    stream: Mutex<SplitStream<Framed<TlsStream<TcpStream>, ServerControlCodec>>>,
}

impl TcpControlChannel {
    pub fn new(stream: TlsStream<TcpStream>) -> Self {
        let (sink, stream) = ServerControlCodec::new().framed(stream).split();

        TcpControlChannel {
            sink: Mutex::new(sink),
            stream: Mutex::new(stream),
            received: AtomicU32::new(0),
        }
    }
}

#[async_trait]
impl ControlChannel for TcpControlChannel {
    async fn send(&self, message: ControlPacket<Clientbound>) -> Result<(), Error> {
        let mut sink = self.sink.lock().await;
        Ok(sink.send(message).await?)
    }

    async fn receive(&self) -> Result<ControlPacket<Serverbound>, Error> {
        let mut stream = self.stream.lock().await;
        let message = stream.try_next().await?;

        match message {
            Some(msg) => {
                self.received.fetch_add(1, Ordering::Relaxed);
                Ok(msg)
            }
            None => Err(IoError::new(ErrorKind::BrokenPipe, "stream closed")),
        }
    }

    fn get_stats(&self) -> ControlChannelStats {
        ControlChannelStats {
            received: self.received.load(Ordering::Acquire),
        }
    }
}