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use std::fmt;
use std::sync::Arc;

use super::{Asset, AssetFormat, Handle, Loader};

pub enum AssetEvent<A, L>
where
    A: Asset,
    A::Data: AssetFormat<Input = L::Output>,
    L: Loader,
{
    Load(Handle<A>),
    Remove(Handle<A>, Arc<A::Data>),
    FormatError(Handle<A>, <A::Data as AssetFormat>::Error),
    LoadError(Handle<A>, L::Error),
}

unsafe impl<A, L> Send for AssetEvent<A, L>
where
    A: Asset,
    A::Data: AssetFormat<Input = L::Output>,
    L: Loader,
{}

unsafe impl<A, L> Sync for AssetEvent<A, L>
where
    A: Asset,
    A::Data: AssetFormat<Input = L::Output>,
    L: Loader,
{}

impl<A, L> fmt::Debug for AssetEvent<A, L>
where
    A: Asset,
    A::Data: fmt::Debug + AssetFormat<Input = L::Output>,
    <A::Data as AssetFormat>::Error: fmt::Debug,
    L: Loader,
    L::Error: fmt::Debug,
{
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            &AssetEvent::Load(ref handle) => write!(f, "Load({:?})", handle),
            &AssetEvent::Remove(ref handle, ref data) => {
                write!(f, "Remove({:?}, {:?})", handle, &**data)
            }
            &AssetEvent::FormatError(ref handle, ref error) => {
                write!(f, "FormatError({:?}, {:?})", handle, error)
            }
            &AssetEvent::LoadError(ref handle, ref error) => {
                write!(f, "LoadError({:?}, {:?})", handle, error)
            }
        }
    }
}