using System;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.Versioning;
using CoreGraphics;
using Foundation;
using UIKit;
 
namespace Microsoft.Maui.Platform
{
	[SupportedOSPlatform("ios13.0")]
	[SupportedOSPlatform("maccatalyst13.0.0")]
	[UnsupportedOSPlatform("tvos")]
	class MauiUIContextMenuInteraction : UIContextMenuInteraction
	{
		WeakReference<IElementHandler> _handler;
 
		// Store a reference to the platform delegate so that it is not garbage collected
		[UnconditionalSuppressMessage("Memory", "MEM0002", Justification = "Delegate is weak on Objective-C side")]
		readonly IUIContextMenuInteractionDelegate? _uiContextMenuInteractionDelegate;
 
		public MauiUIContextMenuInteraction(IElementHandler handler)
			: base(CreateDelegate(out var del))
		{
			_uiContextMenuInteractionDelegate = del;
			_handler = new WeakReference<IElementHandler>(handler);
		}
 
		static IUIContextMenuInteractionDelegate CreateDelegate(out IUIContextMenuInteractionDelegate del) =>
			del = new FlyoutUIContextMenuInteractionDelegate();
 
		public UIContextMenuConfiguration? GetConfigurationForMenu()
		{
			var contextFlyout = (Handler?.VirtualView as IContextFlyoutElement)?.ContextFlyout;
			var mauiContext = Handler?.MauiContext;
 
			if (contextFlyout == null || mauiContext == null)
				return null;
 
			var contextFlyoutHandler = contextFlyout.ToHandler(mauiContext);
			var contextFlyoutPlatformView = contextFlyoutHandler.PlatformView;
 
			if (contextFlyoutPlatformView is UIMenu uiMenu)
			{
				return UIContextMenuConfiguration.Create(
							identifier: null,
							previewProvider: null,
							actionProvider: _ => uiMenu);
			}
 
			return null;
		}
 
		IElementHandler? Handler
		{
			get
			{
				if (_handler.TryGetTarget(out var handler))
				{
					return handler;
				}
 
				return null;
			}
		}
 
		sealed class FlyoutUIContextMenuInteractionDelegate : NSObject, IUIContextMenuInteractionDelegate
		{
			public FlyoutUIContextMenuInteractionDelegate()
			{
			}
 
			public UIContextMenuConfiguration? GetConfigurationForMenu(UIContextMenuInteraction interaction, CGPoint location)
			{
				if (interaction is MauiUIContextMenuInteraction contextMenu)
					return contextMenu.GetConfigurationForMenu();
 
				return null;
			}
		}
	}
}