use std::cmp::Ordering;

/// Helper struct to associate an item with its priority
#[derive(Debug, Clone, Copy)]
pub struct Item<D, P: Ord> {
    data: D,
    priority: P,
}

impl<D, P: Ord> Item<D, P> {
    /// Creates a new instance
    fn new(data: D, priority: P) -> Self {
        Self { data, priority }
    }

    /// Retrieve the internal data, it would be nicer to implement this using [`From`] or [`Into`], but I don't see a way to do that using generics
    fn data(self) -> D {
        self.data
    }
}

// The relevant Ord implementations are based just on the priority
impl<D, P: Ord> Ord for Item<D, P> {
    fn cmp(&self, other: &Self) -> Ordering {
        self.priority.cmp(&other.priority)
    }
}

impl<D, P: Ord> PartialOrd for Item<D, P> {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        Some(self.cmp(other))
    }
}

impl<D, P: Ord> PartialEq for Item<D, P> {
    fn eq(&self, other: &Self) -> bool {
        self.priority == other.priority
    }
}

impl<D, P: Ord> Eq for Item<D, P> {}