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#[cfg(unix)]
use std::fs;

#[cfg(unix)]
use std::os::unix::fs::FileTypeExt;

#[cfg(unix)]
use std::path::Path;

use tokio::net::{TcpListener, TcpStream};

#[cfg(unix)]
use tokio::net::{UnixListener, UnixStream};

#[cfg(unix)]
use tokio_util::either::Either;

#[cfg(unix)]
pub type Stream = Either<TcpStream, UnixStream>;

#[cfg(windows)]
pub type Stream = TcpStream;

use crate::ProtAddr;

pub async fn connect(pa: &ProtAddr) -> Result<Stream, std::io::Error> {
  let strm = match pa {
    ProtAddr::Tcp(sa) => connect_tcp(sa).await?,

    #[cfg(unix)]
    ProtAddr::Uds(sa) => connect_uds(sa).await?
  };

  Ok(strm)
}

/// Attempt to establish a TCP/IP socket connection.
async fn connect_tcp(addr: &str) -> Result<Stream, std::io::Error> {
  let stream = TcpStream::connect(addr).await?;

  #[cfg(unix)]
  return Ok(Either::Left(stream));

  #[cfg(windows)]
  return Ok(stream);
}

/// Attempt to establish a unix domain socket connection.
/// Currently only available on unix-like platforms.
#[cfg(unix)]
async fn connect_uds(addr: &Path) -> Result<Stream, std::io::Error> {
  let addr = match addr.to_str() {
    Some(a) => a.to_string(),
    None => unreachable!()
  };
  let stream = UnixStream::connect(addr).await?;
  Ok(Either::Right(stream))
}

pub enum Listener {
  #[cfg(unix)]
  Unix(UnixListener),
  Tcp(TcpListener)
}

#[derive(Debug)]
pub enum SockAddr {
  Std(std::net::SocketAddr),

  #[cfg(unix)]
  TokioUnix(tokio::net::unix::SocketAddr)
}

impl Listener {
  pub async fn accept(&self) -> Result<(Stream, SockAddr), tokio::io::Error> {
    match self {
      #[cfg(unix)]
      Listener::Unix(u) => {
        let (stream, sa) = u.accept().await?;

        let sa = SockAddr::TokioUnix(sa);

        return Ok((Either::Right(stream), sa));
      }
      Listener::Tcp(t) => {
        let (stream, sa) = t.accept().await?;

        let sa = SockAddr::Std(sa);

        #[cfg(unix)]
        return Ok((Either::Left(stream), sa));

        #[cfg(windows)]
        return Ok((stream, sa));
      }
    }
  }
}

pub async fn bind(pa: &ProtAddr) -> Result<Listener, std::io::Error> {
  let listener = match pa {
    ProtAddr::Tcp(sa) => Listener::Tcp(TcpListener::bind(sa).await?),

    #[cfg(unix)]
    ProtAddr::Uds(sa) => Listener::Unix(UnixListener::bind(Path::new(sa))?)
  };

  Ok(listener)
}

pub async fn force_bind(pa: &ProtAddr) -> Result<Listener, std::io::Error> {
  let listener = match pa {
    ProtAddr::Tcp(_) => bind(pa).await?,

    #[cfg(unix)]
    ProtAddr::Uds(sa) => {
      if sa.exists() {
        let md = fs::metadata(sa)?;
        let ft = md.file_type();
        if !ft.is_socket() {
          return Err(std::io::Error::new(
            std::io::ErrorKind::Other,
            "Not a socket"
          ));
        }
        fs::remove_file(sa)?;
      }
      Listener::Unix(UnixListener::bind(Path::new(sa))?)
    }
  };

  Ok(listener)
}

// vim: set ft=rust et sw=2 ts=2 sts=2 cinoptions=2 tw=79 :