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use super::{handle_error, IntoResponse};
use crate::{IntoResponseError, Response};
#[cfg(feature = "openapi")]
use crate::{NoContent, ResponseSchema};
use futures_util::future::{BoxFuture, FutureExt, TryFutureExt};
use gotham::hyper::{
	header::{InvalidHeaderValue, LOCATION},
	Body, StatusCode
};
#[cfg(feature = "openapi")]
use openapi_type::OpenapiSchema;
use std::{error::Error as StdError, fmt::Debug};
use thiserror::Error;

/// This is the return type of a resource that only returns a redirect. It will result
/// in a _303 See Other_ answer, meaning the redirect will always result in a GET request
/// on the target.
///
/// ```
/// # #[macro_use] extern crate gotham_restful_derive;
/// # mod doc_tests_are_broken {
/// # use gotham::state::State;
/// # use gotham_restful::*;
/// #
/// # #[derive(Resource)]
/// # #[resource(read_all)]
/// # struct MyResource;
/// #
/// #[read_all]
/// fn read_all() -> Redirect {
/// 	Redirect {
/// 		to: "http://localhost:8080/cool/new/location".to_owned()
/// 	}
/// }
/// # }
/// ```
#[derive(Clone, Debug, Default)]
pub struct Redirect {
	pub to: String
}

impl IntoResponse for Redirect {
	type Err = InvalidHeaderValue;

	fn into_response(self) -> BoxFuture<'static, Result<Response, Self::Err>> {
		async move {
			let mut res = Response::new(StatusCode::SEE_OTHER, Body::empty(), None);
			res.header(LOCATION, self.to.parse()?);
			Ok(res)
		}
		.boxed()
	}
}

#[cfg(feature = "openapi")]
impl ResponseSchema for Redirect {
	fn status_codes() -> Vec<StatusCode> {
		vec![StatusCode::SEE_OTHER]
	}

	fn schema(code: StatusCode) -> OpenapiSchema {
		assert_eq!(code, StatusCode::SEE_OTHER);
		<NoContent as ResponseSchema>::schema(StatusCode::NO_CONTENT)
	}
}

// private type due to parent mod
#[derive(Debug, Error)]
pub enum RedirectError<E: StdError + 'static> {
	#[error("{0}")]
	InvalidLocation(#[from] InvalidHeaderValue),
	#[error("{0}")]
	Other(#[source] E)
}

#[allow(ambiguous_associated_items)] // an enum variant is not a type. never.
impl<E> IntoResponse for Result<Redirect, E>
where
	E: Debug + IntoResponseError,
	<E as IntoResponseError>::Err: StdError + Sync
{
	type Err = RedirectError<<E as IntoResponseError>::Err>;

	fn into_response(self) -> BoxFuture<'static, Result<Response, Self::Err>> {
		match self {
			Ok(nc) => nc.into_response().map_err(Into::into).boxed(),
			Err(e) => handle_error(e).map_err(RedirectError::Other).boxed()
		}
	}
}

#[cfg(feature = "openapi")]
impl<E> ResponseSchema for Result<Redirect, E>
where
	E: Debug + IntoResponseError,
	<E as IntoResponseError>::Err: StdError + Sync
{
	fn status_codes() -> Vec<StatusCode> {
		let mut status_codes = E::status_codes();
		status_codes.push(StatusCode::SEE_OTHER);
		status_codes
	}

	fn schema(code: StatusCode) -> OpenapiSchema {
		match code {
			StatusCode::SEE_OTHER => <Redirect as ResponseSchema>::schema(StatusCode::SEE_OTHER),
			code => E::schema(code)
		}
	}
}

#[cfg(test)]
mod test {
	use super::*;
	use futures_executor::block_on;
	use gotham::hyper::StatusCode;
	use thiserror::Error;

	#[derive(Debug, Default, Error)]
	#[error("An Error")]
	struct MsgError;

	#[test]
	fn redirect_response() {
		let redir = Redirect {
			to: "http://localhost/foo".to_owned()
		};
		let res = block_on(redir.into_response()).expect("didn't expect error response");
		assert_eq!(res.status, StatusCode::SEE_OTHER);
		assert_eq!(res.mime, None);
		assert_eq!(
			res.headers.get(LOCATION).map(|hdr| hdr.to_str().unwrap()),
			Some("http://localhost/foo")
		);
		assert_eq!(res.full_body().unwrap(), &[] as &[u8]);

		#[cfg(feature = "openapi")]
		assert_eq!(Redirect::status_codes(), vec![StatusCode::SEE_OTHER]);
	}

	#[test]
	fn redirect_result() {
		let redir: Result<Redirect, MsgError> = Ok(Redirect {
			to: "http://localhost/foo".to_owned()
		});
		let res = block_on(redir.into_response()).expect("didn't expect error response");
		assert_eq!(res.status, StatusCode::SEE_OTHER);
		assert_eq!(res.mime, None);
		assert_eq!(
			res.headers.get(LOCATION).map(|hdr| hdr.to_str().unwrap()),
			Some("http://localhost/foo")
		);
		assert_eq!(res.full_body().unwrap(), &[] as &[u8]);

		#[cfg(feature = "openapi")]
		assert_eq!(<Result<Redirect, MsgError>>::status_codes(), vec![
			StatusCode::INTERNAL_SERVER_ERROR,
			StatusCode::SEE_OTHER
		]);
	}
}