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use crate::{Error, ResponseFuture};
use futures::{future, Future, Stream};

pub trait ResponseContent {
    type Data;

    fn convert_response(response: hyper::Response<hyper::Body>) -> ResponseFuture<Self::Data>;
}

pub trait RequestContent {
    type Data;

    fn content_type() -> Option<http::HeaderValue>;

    fn into_body(self) -> Result<hyper::Body, Error>;
}

pub struct Empty;

impl ResponseContent for Empty {
    type Data = ();

    fn convert_response(response: hyper::Response<hyper::Body>) -> ResponseFuture<()> {
        let (parts, _) = response.into_parts();
        Box::new(future::ok(http::Response::from_parts(parts, ())))
    }
}

impl RequestContent for Empty {
    type Data = ();

    fn into_body(self) -> Result<hyper::Body, Error> {
        Ok(hyper::Body::empty())
    }

    fn content_type() -> Option<http::HeaderValue> {
        None
    }
}

pub struct Json<T>(T);

impl<T> ResponseContent for Json<T>
where
    T: serde::de::DeserializeOwned + Send + 'static,
{
    type Data = T;

    fn convert_response(response: hyper::Response<hyper::Body>) -> ResponseFuture<T> {
        let (parts, body) = response.into_parts();

        let fut = body
            .concat2()
            .map_err(Error::from)
            .and_then(|chunk: hyper::Chunk| {
                serde_json::from_slice(&chunk)
                    .map_err(Error::response)
                    .map(move |body: T| http::Response::from_parts(parts, body))
            });

        Box::new(fut)
    }
}

impl<T> RequestContent for Json<T>
where
    T: serde::Serialize + 'static + Send,
{
    type Data = T;

    fn content_type() -> Option<http::HeaderValue> {
        Some(http::HeaderValue::from_static("application/json"))
    }

    fn into_body(self) -> Result<hyper::Body, Error> {
        serde_json::to_vec(&self.0)
            .map_err(Error::request)
            .map(|bs| hyper::Body::from(bs))
    }
}