use std::{
    future::{ready, Ready},
    rc::Rc,
};

use actix_identity::IdentityExt;
use actix_web::{
    dev::{forward_ready, Service, ServiceRequest, ServiceResponse, Transform},
    web, Error, HttpMessage,
};
use futures_util::{future::LocalBoxFuture, FutureExt};
use sqlx::PgPool;

use crate::models::User;

pub struct LoadCurrentUser;

impl<S, B> Transform<S, ServiceRequest> for LoadCurrentUser
where
    S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error> + 'static,
{
    type Response = ServiceResponse<B>;
    type Error = Error;
    type InitError = ();
    type Transform = LoadCurrentUserMiddleware<S>;
    type Future = Ready<Result<Self::Transform, Self::InitError>>;

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

pub struct LoadCurrentUserMiddleware<S> {
    service: Rc<S>,
}

impl<S, B> Service<ServiceRequest> for LoadCurrentUserMiddleware<S>
where
    S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error> + 'static,
{
    type Response = ServiceResponse<B>;
    type Error = Error;
    type Future = LocalBoxFuture<'static, Result<Self::Response, Self::Error>>;

    forward_ready!(service);

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

        async move {
            if let Ok(identity) = req.get_identity() {
                if let Ok(id) = identity.id() {
                    let pool = req.app_data::<web::Data<PgPool>>().unwrap();

                    let user = User::read_by_id(pool.get_ref(), id.parse().unwrap())
                        .await
                        .unwrap()
                        .unwrap();

                    req.extensions_mut().insert::<User>(user);
                }
            }

            let res = srv.call(req).await?;

            Ok(res)
        }
        .boxed_local()
    }
}