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use crate::{Http, HttpConnect};
use alloy_json_rpc::{RequestPacket, ResponsePacket};
use alloy_transport::{
    utils::guess_local_url, TransportConnect, TransportError, TransportErrorKind, TransportFut,
    TransportResult,
};
use std::task;
use tower::Service;
use tracing::{debug, debug_span, trace, Instrument};
use url::Url;

/// Rexported from [`reqwest`].
pub use reqwest::Client;

/// An [`Http`] transport using [`reqwest`].
pub type ReqwestTransport = Http<Client>;

/// Connection details for a [`ReqwestTransport`].
pub type ReqwestConnect = HttpConnect<ReqwestTransport>;

impl TransportConnect for ReqwestConnect {
    type Transport = ReqwestTransport;

    fn is_local(&self) -> bool {
        guess_local_url(self.url.as_str())
    }

    fn get_transport<'a: 'b, 'b>(
        &'a self,
    ) -> alloy_transport::Pbf<'b, Self::Transport, TransportError> {
        Box::pin(async move { Ok(Http::with_client(Client::new(), self.url.clone())) })
    }
}

impl Http<Client> {
    /// Create a new [`Http`] transport.
    pub fn new(url: Url) -> Self {
        Self { client: Default::default(), url }
    }

    async fn do_reqwest(self, req: RequestPacket) -> TransportResult<ResponsePacket> {
        let resp = self
            .client
            .post(self.url)
            .json(&req)
            .send()
            .await
            .map_err(TransportErrorKind::custom)?;
        let status = resp.status();

        debug!(%status, "received response from server");

        // Unpack data from the response body. We do this regardless of
        // the status code, as we want to return the error in the body
        // if there is one.
        let body = resp.bytes().await.map_err(TransportErrorKind::custom)?;

        debug!(bytes = body.len(), "retrieved response body. Use `trace` for full body");
        trace!(body = %String::from_utf8_lossy(&body), "response body");

        if status != reqwest::StatusCode::OK {
            return Err(TransportErrorKind::http_error(
                status.as_u16(),
                String::from_utf8_lossy(&body).into_owned(),
            ));
        }

        // Deserialize a Box<RawValue> from the body. If deserialization fails, return
        // the body as a string in the error. The conversion to String
        // is lossy and may not cover all the bytes in the body.
        serde_json::from_slice(&body)
            .map_err(|err| TransportError::deser_err(err, String::from_utf8_lossy(&body)))
    }
}

impl Service<RequestPacket> for Http<reqwest::Client> {
    type Response = ResponsePacket;
    type Error = TransportError;
    type Future = TransportFut<'static>;

    #[inline]
    fn poll_ready(&mut self, cx: &mut task::Context<'_>) -> task::Poll<Result<(), Self::Error>> {
        (&*self).poll_ready(cx)
    }

    #[inline]
    fn call(&mut self, req: RequestPacket) -> Self::Future {
        (&*self).call(req)
    }
}

impl Service<RequestPacket> for &Http<reqwest::Client> {
    type Response = ResponsePacket;
    type Error = TransportError;
    type Future = TransportFut<'static>;

    #[inline]
    fn poll_ready(&mut self, _cx: &mut task::Context<'_>) -> task::Poll<Result<(), Self::Error>> {
        // `reqwest` always returns `Ok(())`.
        task::Poll::Ready(Ok(()))
    }

    fn call(&mut self, req: RequestPacket) -> Self::Future {
        let this = self.clone();
        let span = debug_span!("ReqwestTransport", url = %this.url);
        Box::pin(this.do_reqwest(req).instrument(span))
    }
}