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#![doc = include_str!("../README.md")]

use actix_web::http::StatusCode;
use actix_web::{dev, HttpResponse, ResponseError};

use awc::error::{
  ConnectError, SendRequestError as AwcSendRequestError,
};
use awc::ClientResponse;

use std::fmt;

/// Wrapper around awc's [`SendRequestError`] implementing
/// [`actix_web::ResponseError`].
///
/// [`SendRequestError`]: AwcSendRequestError
/// [`actix_web::ResponseError`]: ResponseError
///
#[derive(Debug)]
pub struct SendRequestError(AwcSendRequestError);

impl fmt::Display for SendRequestError {
  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
    write!(f, "{}", self.0)
  }
}

impl From<AwcSendRequestError> for SendRequestError {
  fn from(e: AwcSendRequestError) -> Self {
    Self(e)
  }
}

/// Convert `SendRequestError` to a server `Response`
///
impl ResponseError for SendRequestError {
  fn status_code(&self) -> StatusCode {
    match self.0 {
      AwcSendRequestError::Connect(ConnectError::Timeout) => {
        StatusCode::GATEWAY_TIMEOUT
      }
      AwcSendRequestError::Connect(_) => StatusCode::BAD_REQUEST,
      _ => StatusCode::INTERNAL_SERVER_ERROR,
    }
  }
}

/// Trait for converting a [`ClientResponse`] into a [`HttpResponse`].
///
/// You can implement this trait on your types, of course, but its
/// main goal is to enable [`ClientResponse`] as return value in
/// [`impl Responder`](actix_web::Responder) contexts.
///
/// [`ClientResponse`]: ClientResponse
/// [`HttpResponse`]: HttpResponse
///
pub trait IntoHttpResponse {
  /// Creates a [`HttpResponse`] from `self`.
  ///
  /// [`HttpResponse`]: HttpResponse
  ///
  fn into_http_response(self) -> HttpResponse;

  /// Wraps the [`HttpResponse`] created by [`into_http_response`]
  /// in a `Result`.
  ///
  /// # Errors
  ///
  /// Because [`into_http_response`] is infallible, this method is,
  /// too.
  /// So calling this method never fails and never returns an `Err`.
  ///
  /// [`HttpResponse`]: HttpResponse
  /// [`into_http_response`]: Self::into_http_response
  ///
  fn into_wrapped_http_response<E>(self) -> Result<HttpResponse, E>
  where
    Self: Sized,
  {
    Ok(self.into_http_response())
  }
}

impl IntoHttpResponse
  for ClientResponse<dev::Decompress<dev::Payload>>
{
  fn into_http_response(self) -> HttpResponse {
    let mut response = HttpResponse::build(self.status());

    self.headers().into_iter().for_each(|(k, v)| {
      response.insert_header((k, v));
    });

    response.streaming(self)
  }
}