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// Copyright 2022 System76 <info@system76.com>
// SPDX-License-Identifier: MIT or Apache-2.0

use super::broadcast::Receiver;
use super::AttachedShutdown;

#[cfg(test)]
use super::broadcast::error::TryRecvError;

/// Listens to shutdown signals and constructs shutdown futures.
#[derive(Debug)]
pub struct ShutdownReceiver {
    pub(super) receiver: Receiver<()>,
}

impl ShutdownReceiver {
    /// Create a future which will be cancelled on shutdown.
    pub fn register<F>(self, future: F) -> AttachedShutdown<F> {
        AttachedShutdown {
            receiver: self,
            future,
        }
    }

    /// Waits until a shutdown signal is received.
    pub async fn wait(mut self) {
        let _ = self.receiver.recv().await;
    }

    #[cfg(test)]
    pub(crate) fn try_recv(&mut self) -> Result<(), TryRecvError> {
        self.receiver.try_recv()
    }
}

impl Clone for ShutdownReceiver {
    fn clone(&self) -> Self {
        Self {
            receiver: self.receiver.resubscribe(),
        }
    }
}