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use std::io;

use socket2::{Domain, Protocol, Socket, Type};
#[cfg(target_family = "unix")]
use tokio::net::UnixStream;
use tokio::{
    io::{AsyncRead, AsyncWrite},
    net::TcpSocket,
    time::{timeout, Duration},
};

use super::{
    conn::{Conn, OwnedReadHalf, OwnedWriteHalf},
    Address,
};

/// [`MakeTransport`] creates an [`AsyncRead`] and an [`AsyncWrite`] for the given [`Address`].
#[async_trait::async_trait]
pub trait MakeTransport: Clone + Send + Sync + 'static {
    type ReadHalf: AsyncRead + Send + Sync + Unpin + 'static;
    type WriteHalf: AsyncWrite + Send + Sync + Unpin + 'static;

    async fn make_transport(&self, addr: Address) -> io::Result<(Self::ReadHalf, Self::WriteHalf)>;
    fn set_connect_timeout(&mut self, timeout: Option<Duration>);
    fn set_read_timeout(&mut self, timeout: Option<Duration>);
    fn set_write_timeout(&mut self, timeout: Option<Duration>);
}

#[derive(Default, Debug, Clone, Copy)]
pub struct DefaultMakeTransport {
    cfg: Config,
}

#[derive(Default, Debug, Clone, Copy)]
pub struct Config {
    pub connect_timeout: Option<Duration>,
    pub read_timeout: Option<Duration>,
    pub write_timeout: Option<Duration>,
}

impl Config {
    pub fn new(
        connect_timeout: Option<Duration>,
        read_timeout: Option<Duration>,
        write_timeout: Option<Duration>,
    ) -> Self {
        Self {
            connect_timeout,
            read_timeout,
            write_timeout,
        }
    }

    pub fn with_connect_timeout(mut self, timeout: Option<Duration>) -> Self {
        self.connect_timeout = timeout;
        self
    }

    pub fn with_read_timeout(mut self, timeout: Option<Duration>) -> Self {
        self.read_timeout = timeout;
        self
    }

    pub fn with_write_timeout(mut self, timeout: Option<Duration>) -> Self {
        self.write_timeout = timeout;
        self
    }
}

impl DefaultMakeTransport {
    pub fn new() -> Self {
        Self::default()
    }
}

#[async_trait::async_trait]
impl MakeTransport for DefaultMakeTransport {
    type ReadHalf = OwnedReadHalf;

    type WriteHalf = OwnedWriteHalf;

    async fn make_transport(&self, addr: Address) -> io::Result<(Self::ReadHalf, Self::WriteHalf)> {
        let conn = self.make_connection(addr).await?;
        let (read, write) = conn.stream.into_split();
        Ok((read, write))
    }

    fn set_connect_timeout(&mut self, timeout: Option<Duration>) {
        self.cfg = self.cfg.with_connect_timeout(timeout);
    }

    fn set_read_timeout(&mut self, timeout: Option<Duration>) {
        self.cfg = self.cfg.with_read_timeout(timeout);
    }

    fn set_write_timeout(&mut self, timeout: Option<Duration>) {
        self.cfg = self.cfg.with_write_timeout(timeout);
    }
}

impl DefaultMakeTransport {
    pub async fn make_connection(&self, addr: Address) -> Result<Conn, io::Error> {
        match addr {
            Address::Ip(addr) => {
                let stream = {
                    let domain = Domain::for_address(addr);
                    let socket = Socket::new(domain, Type::STREAM, Some(Protocol::TCP))?;
                    socket.set_nonblocking(true)?;
                    socket.set_read_timeout(self.cfg.read_timeout)?;
                    socket.set_write_timeout(self.cfg.write_timeout)?;

                    #[cfg(unix)]
                    let socket = unsafe {
                        use std::os::unix::io::{FromRawFd, IntoRawFd};
                        TcpSocket::from_raw_fd(socket.into_raw_fd())
                    };
                    #[cfg(windows)]
                    let socket = unsafe {
                        use std::os::windows::io::{FromRawSocket, IntoRawSocket};
                        TcpSocket::from_raw_socket(socket.into_raw_socket())
                    };

                    let connect = socket.connect(addr);

                    if let Some(conn_timeout) = self.cfg.connect_timeout {
                        timeout(conn_timeout, connect).await??
                    } else {
                        connect.await?
                    }
                };
                stream.set_nodelay(true)?;
                Ok(Conn::from(stream))
            }
            #[cfg(target_family = "unix")]
            Address::Unix(addr) => UnixStream::connect(addr).await.map(Conn::from),
        }
    }
}