use std::net::TcpListener;
use std::os::unix::net::UnixListener;
use std::thread;
use anyhow::Result;
use super::conn::Connection;

enum ListenerKind {
    Tcp(TcpListener),
    Unix(UnixListener),
}

pub struct IpcServer {
    listener: ListenerKind,
}

impl IpcServer {
    pub fn bind(addr: &str) -> Result<Self> {
        let listener = TcpListener::bind(addr)?;
        Ok(IpcServer { listener: ListenerKind::Tcp(listener) })
    }

    pub fn bind_unix(path: &str) -> Result<Self> {
        let _ = std::fs::remove_file(path);
        let listener = UnixListener::bind(path)?;
        Ok(IpcServer { listener: ListenerKind::Unix(listener) })
    }

    pub fn accept(&self) -> Result<Connection> {
        match &self.listener {
            ListenerKind::Tcp(l) => {
                let (stream, _addr) = l.accept()?;
                stream.set_nodelay(true)?;
                Ok(Connection::Tcp(stream))
            }
            ListenerKind::Unix(l) => {
                let (stream, _addr) = l.accept()?;
                Ok(Connection::Unix(stream))
            }
        }
    }

    pub fn accept_with_handler<F>(self, handler: F) -> thread::JoinHandle<()>
    where
        F: Fn(Connection) -> Result<()> + Send + 'static,
    {
        match self.listener {
            ListenerKind::Tcp(l) => {
                thread::spawn(move || {
                    for stream in l.incoming() {
                        match stream {
                            Ok(s) => {
                                let _ = s.set_nodelay(true);
                                if let Err(e) = handler(Connection::Tcp(s)) {
                                    eprintln!("ipc handler error: {}", e);
                                }
                            }
                            Err(e) => {
                                eprintln!("ipc accept error: {}", e);
                                break;
                            }
                        }
                    }
                })
            }
            ListenerKind::Unix(l) => {
                thread::spawn(move || {
                    for stream in l.incoming() {
                        match stream {
                            Ok(s) => {
                                if let Err(e) = handler(Connection::Unix(s)) {
                                    eprintln!("ipc handler error: {}", e);
                                }
                            }
                            Err(e) => {
                                eprintln!("ipc accept error: {}", e);
                                break;
                            }
                        }
                    }
                })
            }
        }
    }
}