use crate::*;

/// Implement [Audio]: provide JACK callbacks.
#[macro_export] macro_rules! audio {
    (|$self:ident:$Struct:ident$(<$($L:lifetime),*$($T:ident$(:$U:path)?),*>)?,$c:ident,$s:ident|$cb:expr) => {
        impl $(<$($L),*$($T $(: $U)?),*>)? Audio for $Struct $(<$($L),*$($T),*>)? {
            #[inline] fn process (&mut $self, $c: &Client, $s: &ProcessScope) -> Control { $cb }
        }
    }
}

/// Trait for thing that has a JACK process callback.
pub trait Audio: Send + Sync {
    fn process (&mut self, _: &Client, _: &ProcessScope) -> Control {
        Control::Continue
    }
    fn callback (
        state: &Arc<RwLock<Self>>, client: &Client, scope: &ProcessScope
    ) -> Control where Self: Sized {
        if let Ok(mut state) = state.write() {
            state.process(client, scope)
        } else {
            Control::Quit
        }
    }
}