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use std::{io::Result, path::Path};

use tokio::{
    io::Result as IoResult,
    net::{UnixListener as TokioUnixListener, UnixStream},
};

use crate::{
    listener::{Acceptor, Listener},
    web::RemoteAddr,
};

/// A Unix domain socket listener.
#[cfg_attr(docsrs, doc(cfg(unix)))]
pub struct UnixListener<T> {
    path: T,
}

impl<T> UnixListener<T> {
    /// Binds to the provided address, and returns a [`UnixListener<T>`].
    pub fn bind(path: T) -> Self {
        Self { path }
    }
}

#[async_trait::async_trait]
impl<T: AsRef<Path> + Send> Listener for UnixListener<T> {
    type Acceptor = UnixAcceptor;

    async fn into_acceptor(self) -> IoResult<Self::Acceptor> {
        let listener = TokioUnixListener::bind(self.path)?;
        Ok(UnixAcceptor { listener })
    }
}

/// A acceptor that accepts connections.
#[cfg_attr(docsrs, doc(cfg(unix)))]
pub struct UnixAcceptor {
    listener: TokioUnixListener,
}

#[async_trait::async_trait]
impl Acceptor for UnixAcceptor {
    type Io = UnixStream;

    #[inline]
    fn local_addr(&self) -> IoResult<Vec<RemoteAddr>> {
        self.listener.local_addr().map(|addr| vec![addr.into()])
    }

    #[inline]
    async fn accept(&mut self) -> Result<(Self::Io, RemoteAddr)> {
        let (stream, addr) = self.listener.accept().await?;
        Ok((stream, addr.into()))
    }
}

#[cfg(test)]
mod tests {
    use tokio::{
        io::{AsyncReadExt, AsyncWriteExt},
        time::Duration,
    };

    use super::*;

    #[tokio::test]
    async fn unix_listener() {
        let listener = UnixListener::bind("test-socket");
        let mut acceptor = listener.into_acceptor().await.unwrap();

        tokio::spawn(async move {
            let mut stream = UnixStream::connect("test-socket").await.unwrap();
            stream.write_i32(10).await.unwrap();
        });

        let (mut stream, _) = acceptor.accept().await.unwrap();
        assert_eq!(stream.read_i32().await.unwrap(), 10);

        tokio::time::sleep(Duration::from_secs(1)).await;
        drop(acceptor);
        std::fs::remove_file("test-socket").unwrap();
    }
}