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use actix_rt::System;
// use actix_rt::task::JoinHandle;
use async_trait::async_trait;
use executor_trait::{BlockingExecutor, Executor, FullExecutor, LocalExecutorError, Task};
use lapin::{executor::Executor as OldExecutor, ConnectionProperties};
use std::{
    future::Future,
    pin::Pin,
    task::{Context, Poll},
};

pub trait LapinActixRtExt {
    fn with_actix_rt(self) -> Self
    where
        Self: Sized;
}

impl LapinActixRtExt for ConnectionProperties {
    fn with_actix_rt(self) -> Self {
        self.with_executor(ActixRt)
    }
}

/// Dummy object implementing executor-trait common interfaces on top of actix rt
#[derive(Debug, Default, Clone)]
struct ActixRt;

// struct ATask(JoinHandle<()>);

// impl FullExecutor for ActixRt {}

impl OldExecutor for ActixRt {
    fn spawn(&self, f: Pin<Box<dyn Future<Output = ()> + Send>>) -> lapin::Result<()> {
        if !System::is_set() {
            let _ = System::new("lapin executor");
        }
        actix_rt::spawn(f);
        Ok(())
    }
}

// impl Executor for ActixRt {
//     fn block_on(&self, f: Pin<Box<dyn Future<Output = ()>>>) {
//         actix_rt::Runtime::new()
//             .expect("failed to create runtime")
//             .block_on(f);
//     }

//     fn spawn(&self, f: Pin<Box<dyn Future<Output = ()> + Send>>) -> Box<dyn Task> {
//         Box::new(ATask(actix_rt::spawn(f)))
//     }

//     fn spawn_local(
//         &self,
//         f: Pin<Box<dyn Future<Output = ()>>>,
//     ) -> Result<Box<dyn Task>, LocalExecutorError> {
//         Err(LocalExecutorError(f))
//     }
// }

// #[async_trait]
// impl BlockingExecutor for ActixRt {
//     async fn spawn_blocking(&self, f: Box<dyn FnOnce() + Send + 'static>) {
//         actix_rt::task::spawn_blocking(f)
//             .await
//             .expect("blocking task failed");
//     }
// }

// #[async_trait(?Send)]
// impl Task for ATask {
//     async fn cancel(self: Box<Self>) -> Option<()> {
//         self.0.abort();
//         self.0.await.ok()
//     }
// }

// impl Future for ATask {
//     type Output = ();

//     fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
//         match Pin::new(&mut self.0).poll(cx) {
//             Poll::Pending => Poll::Pending,
//             Poll::Ready(res) => {
//                 res.expect("task has been canceled");
//                 Poll::Ready(())
//             }
//         }
//     }
// }