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mod hyper_service;
mod serve;

use crate::conn::SilentConnection;
use crate::route::{Route, Routes};
use crate::service::serve::Serve;
#[cfg(feature = "session")]
use crate::session::SessionMiddleware;
#[cfg(feature = "session")]
use async_session::SessionStore;
use std::net::SocketAddr;
use std::sync::Arc;
use tokio::net::TcpListener;
use tokio::runtime::Runtime;
use tokio::signal;
use tokio::sync::RwLock;

pub struct Server {
    pub routes: Arc<RwLock<Routes>>,
    addr: SocketAddr,
    conn: Arc<SilentConnection>,
    rt: Runtime,
    shutdown_callback: Option<Box<dyn Fn() + Send + Sync>>,
    #[cfg(feature = "session")]
    session_set: bool,
}

impl Default for Server {
    fn default() -> Self {
        Self::new()
    }
}

impl Server {
    pub fn new() -> Self {
        Self {
            routes: Arc::new(RwLock::new(Routes::new())),
            addr: ([127, 0, 0, 1], 8000).into(),
            conn: Arc::new(SilentConnection::default()),
            rt: tokio::runtime::Builder::new_multi_thread()
                .enable_all()
                .build()
                .unwrap(),
            shutdown_callback: None,
            #[cfg(feature = "session")]
            session_set: false,
        }
    }

    pub fn bind(&mut self, addr: SocketAddr) -> &mut Self {
        self.addr = addr;
        self
    }

    #[cfg(feature = "session")]
    pub fn set_session_store<S: SessionStore>(&mut self, session: S) -> &mut Self {
        self.rt
            .block_on(self.routes.write())
            .hook(SessionMiddleware::new(session));
        self.session_set = true;
        self
    }

    pub fn set_shutdown_callback<F>(&mut self, callback: F) -> &mut Self
    where
        F: Fn() + Send + Sync + 'static,
    {
        self.shutdown_callback = Some(Box::new(callback));
        self
    }

    pub fn bind_route(&mut self, route: Route) -> &mut Self {
        self.rt.block_on(self.routes.write()).add(route);
        self
    }

    pub async fn serve(&self) {
        #[cfg(feature = "session")]
        let session_set = self.session_set;
        let Self { conn, routes, .. } = self;
        #[cfg(feature = "session")]
        if !session_set {
            let session_store = Arc::new(SessionMiddleware::default());
            routes
                .write()
                .await
                .children
                .iter_mut()
                .for_each(|r| r.middleware_hook_first(session_store.clone()));
        }
        tracing::info!("Listening on {}", self.addr);
        let listener = TcpListener::bind(self.addr).await.unwrap();

        loop {
            #[cfg(unix)]
            let terminate = async {
                signal::unix::signal(signal::unix::SignalKind::terminate())
                    .expect("failed to install signal handler")
                    .recv()
                    .await;
            };

            #[cfg(not(unix))]
            let terminate = async {
                let _ = std::future::pending::<()>();
            };
            tokio::select! {
                _ = signal::ctrl_c() => {
                    if let Some(ref callback) = self.shutdown_callback { callback() };
                    break;
                }
                _ = terminate => {
                    if let Some(ref callback) = self.shutdown_callback { callback() };
                    break;
                }
                s = listener.accept() =>{
                    match s{
                        Ok((stream, peer_addr)) => {
                            tracing::info!("Accepting from: {}", stream.peer_addr().unwrap());
                            let routes = routes.read().await.clone();
                            let conn = conn.clone();
                            self.rt.spawn(async move {
                                if let Err(err) = Serve::new(routes, conn).call(stream,peer_addr).await {
                                    tracing::error!("Failed to serve connection: {:?}", err);
                                }
                            });
                        }
                        Err(e) => {
                            tracing::error!(error = ?e, "accept connection failed");
                        }
                    }
                }
            }
        }
    }

    pub fn runtime(&self) -> &Runtime {
        &self.rt
    }

    pub fn set_runtime(mut self, rt: Runtime) -> Self {
        self.rt = rt;
        self
    }

    pub fn run(&self) {
        self.rt.block_on(self.serve());
    }
}