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//! http-client implementation for async-h1.

use super::{Error, HttpClient, Request, Response};

use async_h1::client;
use futures::future::BoxFuture;
use http_types::StatusCode;

/// Async-h1 based HTTP Client.
#[derive(Debug)]
pub struct H1Client {}

impl Default for H1Client {
    fn default() -> Self {
        Self::new()
    }
}

impl H1Client {
    /// Create a new instance.
    pub fn new() -> Self {
        Self {}
    }
}

impl Clone for H1Client {
    fn clone(&self) -> Self {
        Self {}
    }
}

impl HttpClient for H1Client {
    fn send(&self, mut req: Request) -> BoxFuture<'static, Result<Response, Error>> {
        Box::pin(async move {
            // Insert host
            let host = req
                .url()
                .host_str()
                .ok_or_else(|| Error::from_str(StatusCode::BadRequest, "missing hostname"))?
                .to_string();

            let scheme = req.url().scheme();
            if scheme != "http" && scheme != "https" {
                return Err(Error::from_str(
                    StatusCode::BadRequest,
                    format!("invalid url scheme '{}'", scheme),
                ));
            }

            let addr = req
                .url()
                .socket_addrs(|| match req.url().scheme() {
                    "http" => Some(80),
                    "https" => Some(443),
                    _ => None,
                })?
                .into_iter()
                .next()
                .ok_or_else(|| Error::from_str(StatusCode::BadRequest, "missing valid address"))?;

            log::trace!("> Scheme: {}", scheme);

            match scheme {
                "http" => {
                    let stream = async_std::net::TcpStream::connect(addr).await?;
                    req.set_peer_addr(stream.peer_addr().ok());
                    req.set_local_addr(stream.local_addr().ok());
                    client::connect(stream, req).await
                }
                "https" => {
                    let raw_stream = async_std::net::TcpStream::connect(addr).await?;
                    req.set_peer_addr(raw_stream.peer_addr().ok());
                    req.set_local_addr(raw_stream.local_addr().ok());

                    let stream = async_native_tls::connect(host, raw_stream).await?;

                    client::connect(stream, req).await
                }
                _ => unreachable!(),
            }
        })
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use async_std::prelude::*;
    use async_std::task;
    use http_types::url::Url;
    use http_types::Result;
    use std::time::Duration;

    fn build_test_request(url: Url) -> Request {
        let mut req = Request::new(http_types::Method::Post, url);
        req.set_body("hello");
        req.append_header("test", "value");
        req
    }

    #[async_std::test]
    async fn basic_functionality() -> Result<()> {
        let port = portpicker::pick_unused_port().unwrap();
        let mut app = tide::new();
        app.at("/").all(|mut r: tide::Request<()>| async move {
            let mut response = tide::Response::new(http_types::StatusCode::Ok);
            response.set_body(r.body_bytes().await.unwrap());
            Ok(response)
        });

        let server = task::spawn(async move {
            app.listen(("localhost", port)).await?;
            Result::Ok(())
        });

        let client = task::spawn(async move {
            task::sleep(Duration::from_millis(100)).await;
            let request =
                build_test_request(Url::parse(&format!("http://localhost:{}/", port)).unwrap());
            let mut response: Response = H1Client::new().send(request).await?;
            assert_eq!(response.body_string().await.unwrap(), "hello");
            Ok(())
        });

        server.race(client).await?;

        Ok(())
    }
}