#nullable disable
using System.Threading.Tasks;
using ObjCRuntime;
using UIKit;
 
namespace Microsoft.Maui.Controls.Platform.Compatibility
{
	public class ShellItemTransition : IShellItemTransition
	{
		public Task Transition(IShellItemRenderer oldRenderer, IShellItemRenderer newRenderer)
		{
			TaskCompletionSource<bool> task = new TaskCompletionSource<bool>();
			var oldView = oldRenderer.ViewController.View;
			var newView = newRenderer.ViewController.View;
 
			oldView.Layer.RemoveAllAnimations();
			newView.Alpha = 0;
 
			oldView.Superview.InsertSubviewAbove(newView, oldView);
 
			UIView.Animate(0.5, 0, UIViewAnimationOptions.BeginFromCurrentState, () => newView.Alpha = 1, () =>
			{
				task.TrySetResult(true);
			});
 
			return task.Task;
		}
	}
}