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use crate::SmolTransport;
use async_global_executor::{block_on, spawn};
use async_net::{
    unix::{UnixListener, UnixStream},
    TcpListener, TcpStream,
};
use futures_lite::prelude::*;
use std::{env, io::Result, pin::Pin};
use trillium::{log_error, Info};
use trillium_server_common::{
    Binding::{self, *},
    Server, Stopper,
};

#[derive(Debug, Clone)]
pub struct SmolServer(Binding<TcpListener, UnixListener>);
impl From<TcpListener> for SmolServer {
    fn from(value: TcpListener) -> Self {
        Self(Tcp(value))
    }
}
impl From<UnixListener> for SmolServer {
    fn from(value: UnixListener) -> Self {
        Self(Unix(value))
    }
}

#[cfg(unix)]
impl Server for SmolServer {
    type Transport = Binding<SmolTransport<TcpStream>, SmolTransport<UnixStream>>;
    const DESCRIPTION: &'static str = concat!(
        " (",
        env!("CARGO_PKG_NAME"),
        " v",
        env!("CARGO_PKG_VERSION"),
        ")"
    );

    fn handle_signals(stop: Stopper) -> Pin<Box<dyn Future<Output = ()> + Send + 'static>> {
        Box::pin(async move {
            use async_signal::{Signal, Signals};
            let mut signals = Signals::new([Signal::Int, Signal::Term, Signal::Quit]).unwrap();
            while let Some(signal) = signals.next().await {
                if stop.is_stopped() {
                    eprintln!("\nSecond signal ({signal:?}), shutting down harshly");
                    signal_hook::low_level::emulate_default_handler(signal.unwrap() as i32)
                        .unwrap();
                } else {
                    println!("\nShutting down gracefully.\nControl-C again to force.");
                    stop.stop();
                }
            }
        })
    }

    fn accept(&mut self) -> Pin<Box<dyn Future<Output = Result<Self::Transport>> + Send + '_>> {
        Box::pin(async move {
            match &self.0 {
                Tcp(t) => t.accept().await.map(|(t, _)| Tcp(SmolTransport::from(t))),
                Unix(u) => u.accept().await.map(|(u, _)| Unix(SmolTransport::from(u))),
            }
        })
    }

    fn listener_from_tcp(tcp: std::net::TcpListener) -> Self {
        Self(Tcp(tcp.try_into().unwrap()))
    }

    fn listener_from_unix(tcp: std::os::unix::net::UnixListener) -> Self {
        Self(Unix(tcp.try_into().unwrap()))
    }

    fn info(&self) -> Info {
        match &self.0 {
            Tcp(t) => t.local_addr().unwrap().into(),
            Unix(u) => u.local_addr().unwrap().into(),
        }
    }

    fn spawn(fut: impl Future<Output = ()> + Send + 'static) {
        spawn(fut).detach();
    }

    fn block_on(fut: impl Future<Output = ()> + 'static) {
        block_on(fut)
    }

    fn clean_up(self) -> Pin<Box<dyn Future<Output = ()> + Send + 'static>> {
        Box::pin(async move {
            if let Unix(u) = &self.0 {
                if let Ok(local) = u.local_addr() {
                    if let Some(path) = local.as_pathname() {
                        log::info!("deleting {:?}", &path);
                        log_error!(std::fs::remove_file(path));
                    }
                }
            }
        })
    }
}