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use std::future::Future;

use tokio::task::JoinSet;

pub struct FutureBatch<T> 
where
    T: Send,
    T: 'static,

{
    futures: JoinSet<T>,
}

impl<T> FutureBatch<T> 
where
    T: Send,
    T: 'static,
{
    pub fn new() -> Self {
        Self {
            futures: JoinSet::new(),
        }
    }

    pub fn push<F>(&mut self, future: F)
    where
        F: Future<Output = T> + Send + 'static,
        T: Send,
        T: 'static,
    {
        self.futures.spawn(future);
    }

    pub async fn run(mut self) -> Vec<T>
    where
        T: std::marker::Send,
        T: 'static,
    {
        let mut results = vec![];

        while let Some(Ok(res)) = self.futures.join_next().await {
            results.push(res);
        }

        results
    }
}