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    use std::ops::Deref;
    use std::rc::Rc;

    use futures::Future;
    use http::Method;
    use smallvec::SmallVec;

    use error::Error;
    use handler::{AsyncResult, FromRequest, Handler, Responder};
    use httprequest::HttpRequest;
    use httpresponse::HttpResponse;
    use middleware::Middleware;
    use pred;
    use route::Route;
    use router::ResourceDef;

    #[derive(Copy, Clone)]
    pub(crate) struct RouteId(usize);

    /// *Resource* is an entry in route table which corresponds to requested URL.
    ///
    /// Resource in turn has at least one route.
    /// Route consists of an object that implements `Handler` trait (handler)
    /// and list of predicates (objects that implement `Predicate` trait).
    /// Route uses builder-like pattern for configuration.
    /// During request handling, resource object iterate through all routes
    /// and check all predicates for specific route, if request matches all
    /// predicates route route considered matched and route handler get called.
    ///
    /// ```rust
    /// # extern crate actix_web;
    /// use actix_web::{App, HttpResponse, http};
    ///
    /// fn main() {
    ///     let app = App::new()
    ///         .resource(
    ///             "/", |r| r.method(http::Method::GET).f(|r| HttpResponse::Ok()))
    ///         .finish();
    /// }
    pub struct Resource<S = ()> {
        rdef: ResourceDef,
        routes: SmallVec<[Route<S>; 3]>,
        middlewares: Rc<Vec<Box<Middleware<S>>>>,
    }

    impl<S> Resource<S> {
        /// Create new resource with specified resource definition
        pub fn new(rdef: ResourceDef) -> Self {
            Resource {
                rdef,
                routes: SmallVec::new(),
                middlewares: Rc::new(Vec::new()),
            }
        }

        /// Name of the resource
        pub(crate) fn get_name(&self) -> &str {
            self.rdef.name()
        }

        /// Set resource name
        pub fn name(&mut self, name: &str) {
            self.rdef.set_name(name);
        }

        /// Resource definition
        pub fn rdef(&self) -> &ResourceDef {
            &self.rdef
        }
    }

    impl<S: 'static> Resource<S> {
        /// Register a new route and return mutable reference to *Route* object.
        /// *Route* is used for route configuration, i.e. adding predicates,
        /// setting up handler.
        ///
        /// ```rust
        /// # extern crate actix_web;
        /// use actix_web::*;
        ///
        /// fn main() {
        ///     let app = App::new()
        ///         .resource("/", |r| {
        ///             r.route()
        ///                 .filter(pred::Any(pred::Get()).or(pred::Put()))
        ///                 .filter(pred::Header("Content-Type", "text/plain"))
        ///                 .f(|r| HttpResponse::Ok())
        ///         })
        ///         .finish();
        /// }
        /// ```
        pub fn route(&mut self) -> &mut Route<S> {
            self.routes.push(Route::default());
            self.routes.last_mut().unwrap()
        }

        /// Register a new `GET` route.
        pub fn get(&mut self) -> &mut Route<S> {
            self.routes.push(Route::default());
            self.routes.last_mut().unwrap().filter(pred::Get())
        }

        /// Register a new `POST` route.
        pub fn post(&mut self) -> &mut Route<S> {
            self.routes.push(Route::default());
            self.routes.last_mut().unwrap().filter(pred::Post())
        }

        /// Register a new `PUT` route.
        pub fn put(&mut self) -> &mut Route<S> {
            self.routes.push(Route::default());
            self.routes.last_mut().unwrap().filter(pred::Put())
        }

        /// Register a new `DELETE` route.
        pub fn delete(&mut self) -> &mut Route<S> {
            self.routes.push(Route::default());
            self.routes.last_mut().unwrap().filter(pred::Delete())
        }

        /// Register a new `HEAD` route.
        pub fn head(&mut self) -> &mut Route<S> {
            self.routes.push(Route::default());
            self.routes.last_mut().unwrap().filter(pred::Head())
        }

        /// Register a new route and add method check to route.
        ///
        /// ```rust
        /// # extern crate actix_web;
        /// use actix_web::*;
        /// fn index(req: &HttpRequest) -> HttpResponse { unimplemented!() }
        ///
        /// App::new().resource("/", |r| r.method(http::Method::GET).f(index));
        /// ```
        ///
        /// This is shortcut for:
        ///
        /// ```rust
        /// # extern crate actix_web;
        /// # use actix_web::*;
        /// # fn index(req: &HttpRequest) -> HttpResponse { unimplemented!() }
        /// App::new().resource("/", |r| r.route().filter(pred::Get()).f(index));
        /// ```
        pub fn method(&mut self, method: Method) -> &mut Route<S> {
            self.routes.push(Route::default());
            self.routes.last_mut().unwrap().filter(pred::Method(method))
        }

        /// Register a new route and add handler object.
        ///
        /// ```rust
        /// # extern crate actix_web;
        /// use actix_web::*;
        /// fn handler(req: &HttpRequest) -> HttpResponse { unimplemented!() }
        ///
        /// App::new().resource("/", |r| r.h(handler));
        /// ```
        ///
        /// This is shortcut for:
        ///
        /// ```rust
        /// # extern crate actix_web;
        /// # use actix_web::*;
        /// # fn handler(req: &HttpRequest) -> HttpResponse { unimplemented!() }
        /// App::new().resource("/", |r| r.route().h(handler));
        /// ```
        pub fn h<H: Handler<S>>(&mut self, handler: H) {
            self.routes.push(Route::default());
            self.routes.last_mut().unwrap().h(handler)
        }

        /// Register a new route and add handler function.
        ///
        /// ```rust
        /// # extern crate actix_web;
        /// use actix_web::*;
        /// fn index(req: &HttpRequest) -> HttpResponse { unimplemented!() }
        ///
        /// App::new().resource("/", |r| r.f(index));
        /// ```
        ///
        /// This is shortcut for:
        ///
        /// ```rust
        /// # extern crate actix_web;
        /// # use actix_web::*;
        /// # fn index(req: &HttpRequest) -> HttpResponse { unimplemented!() }
        /// App::new().resource("/", |r| r.route().f(index));
        /// ```
        pub fn f<F, R>(&mut self, handler: F)
        where
            F: Fn(&HttpRequest<S>) -> R + 'static,
            R: Responder + 'static,
        {
            self.routes.push(Route::default());
            self.routes.last_mut().unwrap().f(handler)
        }

        /// Register a new route and add handler.
        ///
        /// ```rust
        /// # extern crate actix_web;
        /// use actix_web::*;
        /// fn index(req: HttpRequest) -> HttpResponse { unimplemented!() }
        ///
        /// App::new().resource("/", |r| r.with(index));
        /// ```
        ///
        /// This is shortcut for:
        ///
        /// ```rust
        /// # extern crate actix_web;
        /// # use actix_web::*;
        /// # fn index(req: HttpRequest) -> HttpResponse { unimplemented!() }
        /// App::new().resource("/", |r| r.route().with(index));
        /// ```
        pub fn with<T, F, R>(&mut self, handler: F)
        where
            F: Fn(T) -> R + 'static,
            R: Responder + 'static,
            T: FromRequest<S> + 'static,
        {
            self.routes.push(Route::default());
            self.routes.last_mut().unwrap().with(handler);
        }

        /// Register a new route and add async handler.
        ///
        /// ```rust
        /// # extern crate actix_web;
        /// # extern crate futures;
        /// use actix_web::*;
        /// use futures::future::Future;
        ///
        /// fn index(req: HttpRequest) -> Box<Future<Item=HttpResponse, Error=Error>> {
        ///     unimplemented!()
        /// }
        ///
        /// App::new().resource("/", |r| r.with_async(index));
        /// ```
        ///
        /// This is shortcut for:
        ///
        /// ```rust
        /// # extern crate actix_web;
        /// # extern crate futures;
        /// # use actix_web::*;
        /// # use futures::future::Future;
        /// # fn index(req: HttpRequest) -> Box<Future<Item=HttpResponse, Error=Error>> {
        /// #     unimplemented!()
        /// # }
        /// App::new().resource("/", |r| r.route().with_async(index));
        /// ```
        pub fn with_async<T, F, R, I, E>(&mut self, handler: F)
        where
            F: Fn(T) -> R + 'static,
            R: Future<Item = I, Error = E> + 'static,
            I: Responder + 'static,
            E: Into<Error> + 'static,
            T: FromRequest<S> + 'static,
        {
            self.routes.push(Route::default());
            self.routes.last_mut().unwrap().with_async(handler);
        }

        /// Register a resource middleware
        ///
        /// This is similar to `App's` middlewares, but
        /// middlewares get invoked on resource level.
        ///
        /// *Note* `Middleware::finish()` fires right after response get
        /// prepared. It does not wait until body get sent to peer.
        pub fn middleware<M: Middleware<S>>(&mut self, mw: M) {
            Rc::get_mut(&mut self.middlewares)
                .unwrap()
                .push(Box::new(mw));
        }

        #[inline]
        pub(crate) fn get_route_id(&self, req: &HttpRequest<S>) -> Option<RouteId> {
            for idx in 0..self.routes.len() {
                if (&self.routes[idx]).check(req) {
                    return Some(RouteId(idx));
                }
            }
            None
        }

        #[inline]
        pub(crate) fn handle(
            &self, id: RouteId, req: &HttpRequest<S>,
        ) -> AsyncResult<HttpResponse> {
            if self.middlewares.is_empty() {
                (&self.routes[id.0]).handle(req)
            } else {
                (&self.routes[id.0]).compose(req.clone(), Rc::clone(&self.middlewares))
            }
        }
    }

    /// Default resource
    pub struct DefaultResource<S>(Rc<Resource<S>>);

    impl<S> Deref for DefaultResource<S> {
        type Target = Resource<S>;

        fn deref(&self) -> &Resource<S> {
            self.0.as_ref()
        }
    }

    impl<S> Clone for DefaultResource<S> {
        fn clone(&self) -> Self {
            DefaultResource(self.0.clone())
        }
    }

    impl<S> From<Resource<S>> for DefaultResource<S> {
        fn from(res: Resource<S>) -> Self {
            DefaultResource(Rc::new(res))
        }
    }

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