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#[cfg(feature = "client")]
pub mod client;

use crate::vertx::{cm::ClusterManager, EventBus};
use hashbrown::HashMap;
use hyper::http::Error;
use hyper::server::conn::AddrStream;
use hyper::server::Server;
use hyper::service::{make_service_fn, service_fn};
use hyper::{Body, Method, Request, Response, StatusCode};
use log::info;
use std::convert::Infallible;
use std::net::SocketAddr;
use std::sync::Arc;
use tokio::runtime::{Builder, Runtime};

pub struct HttpServer<CM: 'static + ClusterManager + Send + Sync> {
    pub port: u16,
    event_bus: Option<Arc<EventBus<CM>>>,
    callers: Arc<
        HashMap<
            (String, Method),
            Arc<
                dyn FnMut(Request<Body>, Arc<EventBus<CM>>) -> Result<Response<Body>, Error>
                    + 'static
                    + Send
                    + Sync,
            >,
        >,
    >,
    rt: Runtime,
}

impl<CM: 'static + ClusterManager + Send + Sync> HttpServer<CM> {
    pub(crate) fn new(event_bus: Option<Arc<EventBus<CM>>>) -> HttpServer<CM> {
        HttpServer {
            port: 0,
            event_bus,
            callers: Arc::new(HashMap::new()),
            rt: Builder::new_multi_thread()
                .worker_threads(12)
                .enable_all()
                .build()
                .unwrap(),
        }
    }

    pub fn get<OP>(&mut self, path: &str, op: OP) -> &mut Self
    where
        OP: FnMut(Request<Body>, Arc<EventBus<CM>>) -> Result<Response<Body>, Error>
            + 'static
            + Send
            + Sync,
    {
        self.add_op(path, Method::GET, op)
    }

    pub fn post<OP>(&mut self, path: &str, op: OP) -> &mut Self
    where
        OP: FnMut(Request<Body>, Arc<EventBus<CM>>) -> Result<Response<Body>, Error>
            + 'static
            + Send
            + Sync,
    {
        self.add_op(path, Method::POST, op)
    }

    pub fn put<OP>(&mut self, path: &str, op: OP) -> &mut Self
    where
        OP: FnMut(Request<Body>, Arc<EventBus<CM>>) -> Result<Response<Body>, Error>
            + 'static
            + Send
            + Sync,
    {
        self.add_op(path, Method::PUT, op)
    }

    pub fn delete<OP>(&mut self, path: &str, op: OP) -> &mut Self
    where
        OP: FnMut(Request<Body>, Arc<EventBus<CM>>) -> Result<Response<Body>, Error>
            + 'static
            + Send
            + Sync,
    {
        self.add_op(path, Method::DELETE, op)
    }

    pub fn head<OP>(&mut self, path: &str, op: OP) -> &mut Self
    where
        OP: FnMut(Request<Body>, Arc<EventBus<CM>>) -> Result<Response<Body>, Error>
            + 'static
            + Send
            + Sync,
    {
        self.add_op(path, Method::HEAD, op)
    }

    pub fn patch<OP>(&mut self, path: &str, op: OP) -> &mut Self
    where
        OP: FnMut(Request<Body>, Arc<EventBus<CM>>) -> Result<Response<Body>, Error>
            + 'static
            + Send
            + Sync,
    {
        self.add_op(path, Method::PATCH, op)
    }

    pub fn options<OP>(&mut self, path: &str, op: OP) -> &mut Self
    where
        OP: FnMut(Request<Body>, Arc<EventBus<CM>>) -> Result<Response<Body>, Error>
            + 'static
            + Send
            + Sync,
    {
        self.add_op(path, Method::OPTIONS, op)
    }

    pub fn connect<OP>(&mut self, path: &str, op: OP) -> &mut Self
    where
        OP: FnMut(Request<Body>, Arc<EventBus<CM>>) -> Result<Response<Body>, Error>
            + 'static
            + Send
            + Sync,
    {
        self.add_op(path, Method::CONNECT, op)
    }

    pub fn trace<OP>(&mut self, path: &str, op: OP) -> &mut Self
    where
        OP: FnMut(Request<Body>, Arc<EventBus<CM>>) -> Result<Response<Body>, Error>
            + 'static
            + Send
            + Sync,
    {
        self.add_op(path, Method::TRACE, op)
    }

    fn add_op<OP>(&mut self, path: &str, method: Method, op: OP) -> &mut Self
    where
        OP: FnMut(Request<Body>, Arc<EventBus<CM>>) -> Result<Response<Body>, Error>
            + 'static
            + Send
            + Sync,
    {
        let callers = Arc::get_mut(&mut self.callers).unwrap();
        callers.insert((path.to_owned(), method), Arc::new(op));

        return self;
    }

    pub fn listen_with_default<OP>(&mut self, port: u16, default: OP)
    where
        OP: FnMut(Request<Body>, Arc<EventBus<CM>>) -> Result<Response<Body>, Error>
            + 'static
            + Send
            + Sync
            + Copy,
    {
        let ev = self.event_bus.as_ref().unwrap().clone();

        let mut default = default;

        let callers = self.callers.clone();
        let addr = SocketAddr::from(([0, 0, 0, 0], port));
        let new_service = make_service_fn(move |_conn: &AddrStream| {
            let ev = ev.clone();
            let callers = callers.clone();
            async move {
                let x = Ok::<_, Infallible>(service_fn(move |req: Request<Body>| {
                    let ev = ev.clone();
                    let callers = callers.clone();
                    async move {
                        let ev = ev.to_owned();
                        let callers = callers.to_owned();
                        let op = callers.get(&(req.uri().path().to_owned(), req.method().clone()));
                        match op {
                            Some(op) => {
                                let mut op = op.clone();
                                unsafe {
                                    let op = Arc::get_mut_unchecked(&mut op);
                                    op(req, ev)
                                }
                            }
                            None => default(req, ev),
                        }
                    }
                }));

                x
            }
        });

        self.rt.spawn(async move {
            let server = Server::bind(&addr).serve(new_service);
            info!("start http_server on http://{}", addr);
            let _ = server.await;
        });
    }

    pub fn listen(&mut self, port: u16) {
        let ev = self.event_bus.as_ref().unwrap().clone();

        let callers = self.callers.clone();
        let addr = SocketAddr::from(([0, 0, 0, 0], port));
        let new_service = make_service_fn(move |_conn: &AddrStream| {
            let ev = ev.clone();
            let callers = callers.clone();
            async move {
                let x = Ok::<_, Infallible>(service_fn(move |req: Request<Body>| {
                    let ev = ev.clone();
                    let callers = callers.clone();
                    async move {
                        let ev = ev.to_owned();
                        let callers = callers.to_owned();
                        let op = callers.get(&(req.uri().path().to_owned(), req.method().clone()));
                        <HttpServer<CM>>::invoke_function(req, ev, op)
                    }
                }));

                x
            }
        });

        self.rt.spawn(async move {
            let server = Server::bind(&addr).serve(new_service);
            info!("start http_server on http://{}", addr);
            let _ = server.await;
        });
    }

    #[inline]
    fn invoke_function(
        req: Request<Body>,
        ev: Arc<EventBus<CM>>,
        op: Option<
            &Arc<
                dyn FnMut(Request<Body>, Arc<EventBus<CM>>) -> Result<Response<Body>, Error>
                    + Send
                    + Sync,
            >,
        >,
    ) -> Result<Response<Body>, Error> {
        match op {
            Some(op) => {
                let mut op = op.clone();
                unsafe {
                    let op = Arc::get_mut_unchecked(&mut op);
                    op(req, ev)
                }
            }
            None => Ok(Response::builder()
                .status(StatusCode::NOT_FOUND)
                .body(b"NOTFOUND".to_vec().into())
                .unwrap()),
        }
    }
}