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use crate::ClassicServiceWrapper;

/// Extension trait for [`tower::Service`] that provides the [ClassicServiceExt::into_classic] method.
///
/// [`tower::Service`]: https://docs.rs/tower/*/tower/trait.Service.html
pub trait ClassicServiceExt<Request>: tower_async_service::Service<Request> {
    /// Turn this [`tower::Service`] into an async [`tower_async_service::Service`].
    ///
    /// [`tower::Service`]: https://docs.rs/tower/*/tower/trait.Service.html
    /// [`tower_async_service::Service`]: https://docs.rs/tower-async-service/*/tower_async_service/trait.Service.html
    fn into_classic(self) -> ClassicServiceWrapper<Self>
    where
        Self: Sized,
    {
        ClassicServiceWrapper::new(self)
    }
}

impl<S, Request> ClassicServiceExt<Request> for S where S: tower_async_service::Service<Request> {}

#[cfg(test)]
mod tests {
    use super::*;
    use std::convert::Infallible;
    use tower::{make::Shared, MakeService, Service, ServiceExt};
    use tower_async::service_fn;

    #[derive(Debug)]
    struct AsyncEchoService;

    impl tower_async_service::Service<String> for AsyncEchoService {
        type Response = String;
        type Error = Infallible;

        async fn call(&self, req: String) -> Result<Self::Response, Self::Error> {
            Ok(req)
        }
    }

    #[tokio::test]
    async fn test_into_classic() {
        let mut service = AsyncEchoService.into_classic();
        let response = service
            .ready()
            .await
            .unwrap()
            .call("hello".to_string())
            .await
            .unwrap();
        assert_eq!(response, "hello");
    }

    #[tokio::test]
    async fn test_into_classic_for_builder() {
        let service = AsyncEchoService;
        let mut service = tower::ServiceBuilder::new()
            .rate_limit(1, std::time::Duration::from_secs(1))
            .service(service.into_classic());

        let response = service
            .ready()
            .await
            .unwrap()
            .call("hello".to_string())
            .await
            .unwrap();
        assert_eq!(response, "hello");
    }

    #[tokio::test]
    async fn test_builder_into_classic() {
        let mut service = tower_async::ServiceBuilder::new()
            .timeout(std::time::Duration::from_secs(1))
            .service(AsyncEchoService)
            .into_classic();

        let response = service
            .ready()
            .await
            .unwrap()
            .call("hello".to_string())
            .await
            .unwrap();
        assert_eq!(response, "hello");
    }

    async fn echo<R>(req: R) -> Result<R, Infallible> {
        Ok(req)
    }

    #[tokio::test]
    async fn as_make_service() {
        let mut service = Shared::new(service_fn(echo::<&'static str>).into_classic());

        let mut svc = service.make_service(()).await.unwrap();

        let res = svc.ready().await.unwrap().call("foo").await.unwrap();

        assert_eq!(res, "foo");
    }
}