//! Logging middleware.

use tower::{Layer, Service};

/// Logging middleware layer.
pub struct LoggingLayer;

impl<S> Layer<S> for LoggingLayer {
    type Service = LoggingService<S>;

    fn layer(&self, inner: S) -> Self::Service {
        LoggingService { inner }
    }
}

/// Logging middleware service.
pub struct LoggingService<S> {
    inner: S,
}

impl<S, B> Service<http::Request<B>> for LoggingService<S>
where
    S: Service<http::Request<B>> + Send + 'static,
    S::Future: Send + 'static,
    S::Response: Send + 'static,
    S::Error: std::fmt::Debug + Send + 'static,
    B: Send + 'static,
{
    type Response = S::Response;
    type Error = S::Error;
    type Future = std::pin::Pin<Box<dyn std::future::Future<Output = Result<Self::Response, Self::Error>> + Send + 'static>>;

    fn poll_ready(&mut self, cx: &mut std::task::Context<'_>) -> std::task::Poll<Result<(), Self::Error>> {
        self.inner.poll_ready(cx)
    }

    fn call(&mut self, req: http::Request<B>) -> Self::Future {
        // In a real implementation, we'd log the request here
        let fut = self.inner.call(req);
        Box::pin(async move {
            fut.await
        })
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_logging_layer_creation() {
        let _ = LoggingLayer;
    }
}
