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use axum_lib as axum;

use async_trait::async_trait;
use axum::extract::{FromRequest, RequestParts};
use http::StatusCode;
use http_body::Body;
use hyper::body;

use crate::binding::http::to_event;
use crate::event::Event;

type BoxError = Box<dyn std::error::Error + Send + Sync>;

#[async_trait]
impl<B> FromRequest<B> for Event
where
    B: Body + Send,
    B::Data: Send,
    B::Error: Into<BoxError>,
{
    type Rejection = (StatusCode, String);

    async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
        let req_body = req
            .take_body()
            .ok_or(0)
            .map_err(|_| (StatusCode::BAD_REQUEST, "unexpected empty body".to_string()))?;
        let buf = body::to_bytes(req_body)
            .await
            .map_err(|e| (StatusCode::BAD_REQUEST, format!("{}", e.into())))?
            .to_vec();
        let headers = req.headers();

        to_event(headers, buf).map_err(|e| (StatusCode::BAD_REQUEST, format!("{}", e)))
    }
}

#[cfg(test)]
mod tests {
    use axum_lib as axum;

    use super::*;
    use axum::body::Body;
    use axum::http::{self, Request, StatusCode};

    use crate::test::fixtures;

    #[tokio::test]
    async fn axum_test_request() {
        let expected = fixtures::v10::minimal_string_extension();

        let mut request = RequestParts::new(
            Request::builder()
                .method(http::Method::POST)
                .header("ce-specversion", "1.0")
                .header("ce-id", "0001")
                .header("ce-type", "test_event.test_application")
                .header("ce-source", "http://localhost/")
                .header("ce-someint", "10")
                .body(Body::empty())
                .unwrap(),
        );

        let result = Event::from_request(&mut request).await.unwrap();

        assert_eq!(expected, result);
    }

    #[tokio::test]
    async fn axum_test_bad_request() {
        let mut request = RequestParts::new(
            Request::builder()
                .method(http::Method::POST)
                .header("ce-specversion", "BAD SPECIFICATION")
                .header("ce-id", "0001")
                .header("ce-type", "example.test")
                .header("ce-source", "http://localhost/")
                .header("ce-someint", "10")
                .header("ce-time", fixtures::time().to_rfc3339())
                .body(Body::empty())
                .unwrap(),
        );

        let result = Event::from_request(&mut request).await;
        assert!(result.is_err());
        let rejection = result.unwrap_err();

        let reason = rejection.0;
        assert_eq!(reason, StatusCode::BAD_REQUEST)
    }

    #[tokio::test]
    async fn axum_test_request_with_full_data() {
        let expected = fixtures::v10::full_binary_json_data_string_extension();

        let mut request = RequestParts::new(
            Request::builder()
                .method(http::Method::POST)
                .header("ce-specversion", "1.0")
                .header("ce-id", "0001")
                .header("ce-type", "test_event.test_application")
                .header("ce-source", "http://localhost/")
                .header("ce-subject", "cloudevents-sdk")
                .header("content-type", "application/json")
                .header("ce-string_ex", "val")
                .header("ce-int_ex", "10")
                .header("ce-bool_ex", "true")
                .header("ce-time", &fixtures::time().to_rfc3339())
                .body(Body::from(fixtures::json_data_binary()))
                .unwrap(),
        );

        let result = Event::from_request(&mut request).await.unwrap();

        assert_eq!(expected, result);
    }
}