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use log::*;
use std::error::Error;
use std::future::Future;
use std::net::SocketAddr;
use std::sync::{Arc};
use tokio::net::{TcpListener, ToSocketAddrs};
use crate::peer::TCPPeer;
use std::marker::PhantomData;
use tokio::net::tcp::OwnedReadHalf;
use aqueue::{Actor, AError, AResult};
use crate::IPeer;
use std::io;
use tokio::task::JoinHandle;
use tokio::sync::mpsc::{Sender, Receiver,channel};
use tokio::io::AsyncWriteExt;


pub type ConnectEventType = fn(SocketAddr) -> bool;

pub struct TCPServer<I, R,T> {
    listener: Option<TcpListener>,
    connect_event: Option<ConnectEventType>,
    input_event: Arc<I>,
    _phantom:PhantomData<R>,
    __phantom:PhantomData<T>
}

unsafe impl <I,R,T> Send for TCPServer<I, R,T>{}
unsafe impl <I,R,T> Sync for TCPServer<I, R,T>{}

impl<I, R,T> TCPServer<I, R,T>
    where
        I: Fn(OwnedReadHalf,Arc<Actor<TCPPeer>>,T) -> R + Send + Sync + 'static,
        R: Future<Output = ()> + Send+'static,
        T:Clone+Send+'static
{
    /// 创建一个新的TCP服务
    pub(crate) async fn new<A: ToSocketAddrs>(
        addr: A,
        input: I,
        connect_event:Option<ConnectEventType>
    ) -> Result<Arc<Actor<TCPServer<I, R,T>>>, Box<dyn Error>> {
        let listener = TcpListener::bind(addr).await?;
        Ok(Arc::new(Actor::new(TCPServer {
            listener:Some(listener),
            connect_event,
            input_event: Arc::new(input),
            _phantom:PhantomData::default(),
            __phantom:PhantomData::default()
        })))
    }

    /// 启动TCP服务
    pub async fn start(&mut self,token:T) -> AResult<JoinHandle<io::Result<()>>> {
        if let Some(listener) = self.listener.take() {
            let connect_event = self.connect_event.take();
            let input_event = self.input_event.clone();
            let join: JoinHandle<io::Result<()>> = tokio::spawn(async move {
                loop {
                    let (socket, addr) = listener.accept().await?;
                    if let Some(ref connect_event) = connect_event {
                        if !connect_event(addr) {
                            warn!("addr:{} not connect", addr);
                            continue;
                        }
                    }
                    trace!("start read:{}", addr);
                    let (reader, mut sender) = socket.into_split();
                    let (tx, mut rx):(Sender<Vec<u8>>,Receiver<Vec<u8>>)=channel(1024);

                    tokio::spawn(async move{
                        while let Some(buff) = rx.recv().await {
                            if buff.is_empty() {
                                if let Err(er) =  sender.shutdown().await {
                                    trace!("{} disconnect error:{}", addr, er);
                                }
                                break;
                            } else if let Err(er) = sender.write(&buff).await {
                                error!("{} send buffer error:{}", addr, er);
                            }
                        }
                    });


                    let peer = TCPPeer::new(addr, tx);
                    let input = input_event.clone();
                    let peer_token=token.clone();
                    tokio::spawn(async move {
                        (*input)(reader, peer.clone(),peer_token).await;
                        if let Err(er) = peer.disconnect().await {
                            error!("disconnect client:{:?} err:{}", peer.addr(), er);
                        }
                        else{
                            debug!("{} disconnect", peer.addr())
                        }
                    });
                }

            });

            return Ok(join)
        }

        Err(AError::StrErr("not listener or repeat start".into()))
    }
}

#[aqueue::aqueue_trait]
pub trait ITCPServer<T>{
    async fn start(&self,token:T)->AResult<JoinHandle<io::Result<()>>>;
    async fn start_block(&self,token:T)->Result<(),Box<dyn Error>>;
}

#[aqueue::aqueue_trait]
impl <I, R,T> ITCPServer<T>  for Actor<TCPServer<I, R,T>>
    where
        I: Fn(OwnedReadHalf,Arc<Actor<TCPPeer>>,T) -> R + Send + Sync + 'static,
        R: Future<Output = ()> + Send+'static,
        T: Clone+Send+Sync+'static{

   async fn start(&self,token:T)->AResult<JoinHandle<io::Result<()>>> {
        self.inner_call(async move |inner| {
            inner.get_mut().start(token).await
        }).await
    }

    async fn start_block(&self,token:T) -> Result<(), Box<dyn Error>> {
        Self::start(self,token).await?.await??;
        Ok(())
    }
}