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use super::bytesio_errors::{BytesIOError, BytesIOErrorValue};

use bytes::BufMut;
use bytes::Bytes;
use bytes::BytesMut;
use futures::StreamExt;

use std::time::Duration;

use tokio::net::TcpStream;
use tokio::time::sleep;

use futures::SinkExt;
use std::time::{SystemTime, UNIX_EPOCH};
use tokio_util::codec::BytesCodec;
use tokio_util::codec::Framed;

use async_trait::async_trait;
use std::net::SocketAddr;
use tokio::net::UdpSocket;

pub enum NetType {
    TCP,
    UDP,
}

#[async_trait]
pub trait TNetIO: Send + Sync {
    async fn write(&mut self, bytes: Bytes) -> Result<(), BytesIOError>;
    async fn read(&mut self) -> Result<BytesMut, BytesIOError>;
    async fn read_timeout(&mut self, duration: Duration) -> Result<BytesMut, BytesIOError>;
    fn get_net_type(&self) -> NetType;
}

pub struct UdpIO {
    socket: UdpSocket,
}

impl UdpIO {
    pub async fn new(remote_domain: String, remote_port: u16, local_port: u16) -> Option<Self> {
        let remote_address = format!("{remote_domain}:{remote_port}");
        log::info!("remote address: {}", remote_address);
        let local_address = format!("0.0.0.0:{local_port}");
        if let Ok(local_socket) = UdpSocket::bind(local_address).await {
            if let Ok(remote_socket_addr) = remote_address.parse::<SocketAddr>() {
                if let Err(err) = local_socket.connect(remote_socket_addr).await {
                    log::info!("connect to remote udp socket error: {}", err);
                }
            }
            return Some(Self {
                socket: local_socket,
            });
        }

        None
    }
    pub fn get_local_port(&self) -> Option<u16> {
        if let Ok(local_addr) = self.socket.local_addr() {
            log::info!("local address: {}", local_addr);
            return Some(local_addr.port());
        }

        None
    }
}

#[async_trait]
impl TNetIO for UdpIO {
    fn get_net_type(&self) -> NetType {
        NetType::UDP
    }

    async fn write(&mut self, bytes: Bytes) -> Result<(), BytesIOError> {
        self.socket.send(bytes.as_ref()).await?;
        Ok(())
    }

    async fn read_timeout(&mut self, duration: Duration) -> Result<BytesMut, BytesIOError> {
        let begin_millseconds = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();

        loop {
            match self.read().await {
                Ok(data) => {
                    return Ok(data);
                }
                Err(_) => {
                    sleep(Duration::from_millis(50)).await;
                    let current_millseconds = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();

                    if current_millseconds - begin_millseconds > duration {
                        return Err(BytesIOError {
                            value: BytesIOErrorValue::TimeoutError,
                        });
                    }
                }
            }
        }
    }

    async fn read(&mut self) -> Result<BytesMut, BytesIOError> {
        let mut buf = vec![0; 4096];
        let len = self.socket.recv(&mut buf).await?;
        let mut rv = BytesMut::new();
        rv.put(&buf[..len]);

        Ok(rv)
    }
}

pub struct TcpIO {
    stream: Framed<TcpStream, BytesCodec>,
    //timeout: Duration,
}

impl TcpIO {
    pub fn new(stream: TcpStream) -> Self {
        Self {
            stream: Framed::new(stream, BytesCodec::new()),
            // timeout: ms,
        }
    }
}

#[async_trait]
impl TNetIO for TcpIO {
    fn get_net_type(&self) -> NetType {
        NetType::TCP
    }

    async fn write(&mut self, bytes: Bytes) -> Result<(), BytesIOError> {
        self.stream.send(bytes).await?;

        Ok(())
    }

    async fn read_timeout(&mut self, duration: Duration) -> Result<BytesMut, BytesIOError> {
        let begin_millseconds = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();

        loop {
            match self.read().await {
                Ok(data) => {
                    return Ok(data);
                }
                Err(_) => {
                    sleep(Duration::from_millis(50)).await;
                    let current_millseconds = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();

                    if current_millseconds - begin_millseconds > duration {
                        return Err(BytesIOError {
                            value: BytesIOErrorValue::TimeoutError,
                        });
                    }
                }
            }
        }
    }

    async fn read(&mut self) -> Result<BytesMut, BytesIOError> {
        let message = self.stream.next().await;

        match message {
            Some(data) => match data {
                Ok(bytes) => Ok(bytes),
                Err(err) => Err(BytesIOError {
                    value: BytesIOErrorValue::IOError(err),
                }),
            },
            None => Err(BytesIOError {
                value: BytesIOErrorValue::NoneReturn,
            }),
        }
    }
}