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use crate::{
    context::Context,
    error::Error,
    middleware::{ImplMiddleware, MiddlewareBuilder, Next},
    request::Request,
    response::Response,
    router::{ImplRoute, Route, Router, RouterBuilder},
    tokio_io::TokioIO,
};
use futures::{TryFutureExt,FutureExt};
use http_body_util::Full;
use hyper::body::Bytes;
use hyper::{server::conn::http1, service::Service};
use std::{future::Future, net::SocketAddr, pin::Pin};
use tokio::{net::TcpListener, sync::OnceCell};

#[doc(hidden)]
static SERVER: OnceCell<Server> = OnceCell::const_new();

#[doc(hidden)]
#[inline]
fn write_into_static(server: Server) -> Result<&'static Server, Error> {
    SERVER
        .set(server)
        .map_err(|_| Error::Other(String::from("Server alrealy initialized")))?;
    let server = SERVER.get().expect("Memory has been initialized above.");
    Ok(server)
}

#[doc(hidden)]
pub struct Builder<'a, C, M>
where
    C: 'static + Route + Unpin + Send + Sync,
    M: 'static + Next + Unpin + Send + Sync,
{
    router: RouterBuilder<'a, C>,
    middlewares: MiddlewareBuilder<M>,
}

impl<'a, C, M> Builder<'a, C, M>
where
    C: 'static + Route + Unpin + Send + Sync,
    M: 'static + Next + Unpin + Send + Sync,
{
    #[inline]
    pub fn router<R, F>(self, f: F) -> Builder<'a, R, M>
    where
        R: Route + Send + Sync + Unpin,
        F: FnOnce(RouterBuilder<C>) -> RouterBuilder<R>,
    {
        Builder {
            router: f(self.router),
            middlewares: self.middlewares,
        }
    }

    #[inline]
    pub fn middleware<N, F>(self, f: F) -> Builder<'a, C, N>
    where
        N: Next + Unpin + Send + Sync,
        F: FnOnce(MiddlewareBuilder<M>) -> MiddlewareBuilder<N>,
    {
        Builder {
            router: self.router,
            middlewares: f(self.middlewares),
        }
    }

    #[inline]
    pub fn build(self) -> Server {
        Server {
            router: self.router.build(),
            middlewares: self.middlewares.build(),
        }
    }
}

#[doc(hidden)]
pub struct Server {
    router: Router,
    middlewares: Box<dyn Next>,
}

impl<'a> Server {
    #[inline]
    fn new_stack(&'static self, addr: SocketAddr) -> Stack {
        Stack { server: self, addr }
    }

    #[inline]
    pub fn builder() -> Builder<'a, ImplRoute, ImplMiddleware> {
        Builder {
            router: RouterBuilder::default(),
            middlewares: MiddlewareBuilder::default(),
        }
    }

    #[inline]
    async fn serve(&self, mut req: Request) -> Result<Response, Error> {
        let meta = self.router.resolve_metadata(&mut req);
        let ctx = Context::new(req, self.router.clone(), meta);
        let err_ctx = ctx.clone_with_empty_state();

        let res = self
            .middlewares
            .next(ctx)
            .and_then(|mut ctx| async move {
                let res = ctx
                    .state
                    .take_response()
                    .ok_or_else(|| Error::Other(String::from("Response moved")))?;
                Ok(res)
            })
            .await
            .or_else(|e| {
                let builder = crate::response::Builder::new();
                e.response_builder(builder, &err_ctx)
                    .build()
                    .map_err(|e2| e2)
            });
        res
    }

    #[inline]
    pub async fn listen(self, addr: &str) -> Result<(), Error> {
        let stack = write_into_static(self)?;
        let listener = TcpListener::bind(addr).await?;
        println!("{}{}", "\x1b[31m", addr);

        loop {
            let (stream, addr) = listener.accept().await?;
            tokio::task::spawn(async move {
                if let Err(error) = http1::Builder::new()
                    .serve_connection(TokioIO::new(stream), stack.new_stack(addr))
                    .await
                {
                    eprintln!("Error while serving HTTP connection: {error}");
                }
            });
        }
    }

    #[cfg(feature = "https")]
    #[inline]
    pub async fn listen_tls(self, addr: &str, tls: crate::rustls::TlsConfig) -> Result<(), Error> {
        let stack = write_into_static(self)?;
        let listener = TcpListener::bind(addr).await?;
        println!("{}{}", "\x1b[31m", addr);

        let tls: tokio_rustls::TlsAcceptor = tls.build().map(std::sync::Arc::new)?.into();

        loop {
            let (stream, addr) = listener.accept().await?;
            let tls_stream = tls.accept(stream).await?;
            tokio::task::spawn(async move {
                if let Err(error) = http1::Builder::new()
                    .serve_connection(TokioIO::new(tls_stream), stack.new_stack(addr))
                    .await
                {
                    eprintln!("Error while serving HTTP connection: {error}");
                }
            });
        }
    }
}

#[doc(hidden)]
#[derive(Clone)]
struct Stack {
    server: &'static Server,
    addr: SocketAddr,
}

impl Service<hyper::Request<hyper::body::Incoming>> for Stack {
    type Error = Error;
    type Response = hyper::Response<Full<Bytes>>;
    type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;

    #[inline]
    fn call(&self, req: hyper::Request<hyper::body::Incoming>) -> Self::Future {
        let req = Request::new(req.map(crate::body::IncomingBody::Incoming), self.addr);
        Box::pin(self.server.serve(req).map(|r| r.and_then(|r| r.into_raw()))) as Self::Future
    }
}