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use std::fmt;

use futures::{Future, TryFutureExt};

use crate::Service;
/// Service returned by the [`map_response`] combinator.
///
/// [`map_response`]: crate::service::ServiceExt::map_response
#[derive(Clone)]
pub struct MapResponse<S, F> {
    pub(crate) inner: S,
    pub(crate) f: F,
}

impl<S, F, Cx, Req, Response> Service<Cx, Req> for MapResponse<S, F>
where
    S: Service<Cx, Req>,
    F: FnOnce(S::Response) -> Response + Clone + Send,
{
    type Response = Response;
    type Error = S::Error;
    type Future<'cx> = impl Future<Output = Result<Self::Response, Self::Error>> + 'cx
    where
        Cx: 'cx,
        Self: 'cx;

    fn call<'cx, 's>(&'s self, cx: &'cx mut Cx, req: Req) -> Self::Future<'cx>
    where
        's: 'cx,
    {
        self.inner.call(cx, req).map_ok(self.f.clone())
    }
}

impl<S, F> fmt::Debug for MapResponse<S, F>
where
    S: fmt::Debug,
{
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("MapResponse")
            .field("inner", &self.inner)
            .field("f", &format_args!("{}", std::any::type_name::<F>()))
            .finish()
    }
}