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use futures::{future, Future};
use hyper::client::HttpConnector;
use hyper_tls::HttpsConnector;

mod error;
pub use error::Error;
pub use http;

pub mod content;
pub use content::{RequestContent, ResponseContent};

pub type ResponseFuture<T> =
    Box<dyn Future<Item = http::Response<T>, Error = Error> + Send + 'static>;

pub trait HttpClient
where
    Self: Send + Sync + Sized + 'static,
{
    fn perform(&self, r: hyper::Request<hyper::Body>) -> hyper::client::ResponseFuture;

    fn send<Req, Res>(&self, r: http::Request<Req>) -> ResponseFuture<Res::Data>
    where
        Req: RequestContent + 'static,
        Res: ResponseContent + 'static,
    {
        let (mut parts, body) = r.into_parts();

        let hyper_body = match body.into_body() {
            Ok(body) => body,
            Err(err) => return Box::new(future::err(err)),
        };

        if let Some(suggested_content_type) = Req::content_type() {
            // Don't overwrite the header key if it was set by user.
            if !parts.headers.contains_key(http::header::CONTENT_TYPE) {
                parts
                    .headers
                    .insert(http::header::CONTENT_TYPE, suggested_content_type);
            }
        }

        let request = hyper::Request::from_parts(parts, hyper_body);

        let fut = self
            .perform(request)
            .map_err(Error::from)
            .and_then(|response| Res::convert_response(response));

        Box::new(fut)
    }

    fn https(connector_threads: usize) -> HttpsClient {
        HttpsClient::new(connector_threads)
    }
}

pub struct HttpsClient {
    http_client: hyper::Client<HttpsConnector<HttpConnector>>,
}

impl HttpsClient {
    pub fn new(connector_threads: usize) -> HttpsClient {
        let https = HttpsConnector::new(connector_threads).expect("Setting up SSL connector");
        let http_client = hyper::Client::builder().build::<_, hyper::Body>(https);
        HttpsClient { http_client }
    }
}

impl HttpClient for HttpsClient {
    fn perform(&self, r: hyper::Request<hyper::Body>) -> hyper::client::ResponseFuture {
        self.http_client.request(r)
    }
}