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    use std::rc::Rc;

    use actix_utils::future::{ready, Ready};
    use actix_web::{
        body::{EitherBody, MessageBody},
        dev::{Service, ServiceRequest, ServiceResponse, Transform},
        Error, HttpMessage, Result,
    };
    use futures_util::future::{FutureExt as _, LocalBoxFuture};

    use crate::{identity::IdentityItem, IdentityPolicy};

    /// Request identity middleware
    ///
    /// ```
    /// use actix_web::App;
    /// use actix_identity::{CookieIdentityPolicy, IdentityService};
    ///
    /// // create cookie identity backend
    /// let policy = CookieIdentityPolicy::new(&[0; 32])
    ///            .name("auth-cookie")
    ///            .secure(false);
    ///
    /// let app = App::new()
    ///     // wrap policy into identity middleware
    ///     .wrap(IdentityService::new(policy));
    /// ```
    pub struct IdentityService<T> {
        backend: Rc<T>,
    }

    impl<T> IdentityService<T> {
        /// Create new identity service with specified backend.
        pub fn new(backend: T) -> Self {
            IdentityService {
                backend: Rc::new(backend),
            }
        }
    }

    impl<S, T, B> Transform<S, ServiceRequest> for IdentityService<T>
    where
        S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error> + 'static,
        S::Future: 'static,
        T: IdentityPolicy,
        B: MessageBody + 'static,
    {
        type Response = ServiceResponse<EitherBody<B>>;
        type Error = Error;
        type InitError = ();
        type Transform = IdentityServiceMiddleware<S, T>;
        type Future = Ready<Result<Self::Transform, Self::InitError>>;

        fn new_transform(&self, service: S) -> Self::Future {
            ready(Ok(IdentityServiceMiddleware {
                backend: self.backend.clone(),
                service: Rc::new(service),
            }))
        }
    }

    pub struct IdentityServiceMiddleware<S, T> {
        pub(crate) service: Rc<S>,
        pub(crate) backend: Rc<T>,
    }

    impl<S, T> Clone for IdentityServiceMiddleware<S, T> {
        fn clone(&self) -> Self {
            Self {
                backend: Rc::clone(&self.backend),
                service: Rc::clone(&self.service),
            }
        }
    }

    impl<S, T, B> Service<ServiceRequest> for IdentityServiceMiddleware<S, T>
    where
        S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error> + 'static,
        S::Future: 'static,
        T: IdentityPolicy,
        B: MessageBody + 'static,
    {
        type Response = ServiceResponse<EitherBody<B>>;
        type Error = Error;
        type Future = LocalBoxFuture<'static, Result<Self::Response, Self::Error>>;

        actix_service::forward_ready!(service);

        fn call(&self, mut req: ServiceRequest) -> Self::Future {
            let srv = Rc::clone(&self.service);
            let backend = Rc::clone(&self.backend);
            let fut = self.backend.from_request(&mut req);

            async move {
                match fut.await {
                    Ok(id) => {
                        req.extensions_mut()
                            .insert(IdentityItem { id, changed: false });

                        let mut res = srv.call(req).await?;
                        let id = res.request().extensions_mut().remove::<IdentityItem>();

                        if let Some(id) = id {
                            match backend.to_response(id.id, id.changed, &mut res).await {
                                Ok(_) => Ok(res.map_into_left_body()),
                                Err(err) => Ok(res.error_response(err).map_into_right_body()),
                            }
                        } else {
                            Ok(res.map_into_left_body())
                        }
                    }
                    Err(err) => Ok(req.error_response(err).map_into_right_body()),
                }
            }
            .boxed_local()
        }
    }

    #[cfg(test)]
    mod tests {
        use std::{rc::Rc, time::Duration};

        use actix_service::into_service;
        use actix_web::{dev, error, test, Error, Result};

        use super::*;

        #[actix_web::test]
        async fn test_borrowed_mut_error() {
            use actix_utils::future::{ok, Ready};
            use futures_util::future::lazy;

            struct Ident;
            impl IdentityPolicy for Ident {
                type Future = Ready<Result<Option<String>, Error>>;
                type ResponseFuture = Ready<Result<(), Error>>;

                fn from_request(&self, _: &mut dev::ServiceRequest) -> Self::Future {
                    ok(Some("test".to_string()))
                }

                fn to_response<B>(
                    &self,
                    _: Option<String>,
                    _: bool,
                    _: &mut dev::ServiceResponse<B>,
                ) -> Self::ResponseFuture {
                    ok(())
                }
            }

            let srv = crate::middleware::IdentityServiceMiddleware {
                backend: Rc::new(Ident),
                service: Rc::new(into_service(|_: dev::ServiceRequest| async move {
                    actix_web::rt::time::sleep(Duration::from_secs(100)).await;
                    Err::<dev::ServiceResponse, _>(error::ErrorBadRequest("error"))
                })),
            };

            let srv2 = srv.clone();
            let req = test::TestRequest::default().to_srv_request();

            actix_web::rt::spawn(async move {
                let _ = srv2.call(req).await;
            });

            actix_web::rt::time::sleep(Duration::from_millis(50)).await;

            let _ = lazy(|cx| srv.poll_ready(cx)).await;
        }
    }