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use crate::task::{ContextId, GpuTask, Progress};

#[derive(Clone)]
pub struct OptionTask<T> {
    option: Option<T>,
}

unsafe impl<Ec, T> GpuTask<Ec> for OptionTask<T>
where
    T: GpuTask<Ec>,
{
    type Output = Option<T::Output>;

    fn context_id(&self) -> ContextId {
        match &self.option {
            Some(task) => task.context_id(),
            None => ContextId::Any,
        }
    }

    fn progress(&mut self, execution_context: &mut Ec) -> Progress<Self::Output> {
        match &mut self.option {
            Some(task) => task.progress(execution_context).map(Some),
            None => Progress::Finished(None),
        }
    }
}

impl<T> From<Option<T>> for OptionTask<T> {
    fn from(option: Option<T>) -> Self {
        OptionTask { option }
    }
}