namespace ICRebuild.Core;

// Called by the framework-thread module manager. One native hook can serve multiple modules.
public sealed class SharedModuleResource(Action<ResourceScope> start)
{
    private ResourceScope? resource;
    private int owners;
    private bool cleanupFailed;
    public void Acquire(ResourceScope owner)
    {
        if(cleanupFailed) throw new InvalidOperationException("共享 Hook 清理失败，禁止重复挂接");
        if(resource==null)
        {
            var created=new ResourceScope();
            try { start(created); resource=created; }
            catch(Exception startup)
            {
                try { created.Dispose(); }
                catch(Exception cleanup) { cleanupFailed=true; throw new AggregateException(startup,cleanup); }
                throw;
            }
        }
        owners++;
        try { owner.Defer(Release); } catch { Release(); throw; }
    }
    private void Release()
    {
        if(--owners!=0) return;
        var old=resource; resource=null;
        try { old?.Dispose(); } catch { cleanupFailed=true; throw; }
    }
}