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use std::{future::Future, sync, thread};

pub use tokio::runtime::{Builder, Handle};

pub fn new_runtime<F, R>(
    name_prefix: &str,
    runtime_builder_opt: Option<Builder>,
    block: F,
) -> (Handle, thread::JoinHandle<()>)
where
    F: FnOnce(Handle) -> R + Send + 'static,
    R: Future,
{
    let barrier = sync::Arc::new(sync::Barrier::new(2));
    let barrier_clone = sync::Arc::clone(&barrier);

    let service_name = format!("{}Service", name_prefix);
    let runtime_name = format!("{}Runtime", name_prefix);

    let mut runtime = runtime_builder_opt
        .unwrap_or_else(|| {
            let mut builder = Builder::new();
            builder.threaded_scheduler();
            builder
        })
        .thread_name(&runtime_name)
        .build()
        .unwrap_or_else(|_| panic!("tokio runtime {} initialized", runtime_name));

    let handle = runtime.handle().clone();
    let executor = handle.clone();

    let handler = thread::Builder::new()
        .name(service_name)
        .spawn(move || {
            let future = block(handle);
            barrier_clone.wait();
            runtime.block_on(future);
        })
        .unwrap_or_else(|_| panic!("tokio runtime {} started", runtime_name));

    barrier.wait();
    (executor, handler)
}