#nullable disable
using System;
using Microsoft.Maui.Controls.Internals;
using Microsoft.Maui.Controls.Platform;
using UIKit;
 
namespace Microsoft.Maui.Controls.Handlers.Items
{
	internal static class TemplateHelpers
	{
 
		public static IPlatformViewHandler GetHandler(View view, IMauiContext context)
		{
			if (view == null)
			{
				throw new ArgumentNullException(nameof(view));
			}
			var handler = view.Handler;
 
			if (handler == null)
				handler = view.ToHandler(context);
 
			(handler.PlatformView as UIView).Frame = view.Bounds.ToCGRect();
 
			return (IPlatformViewHandler)handler;
		}
 
		public static (UIView PlatformView, VisualElement FormsElement) RealizeView(object view, DataTemplate viewTemplate, ItemsView itemsView)
		{
			if (viewTemplate != null)
			{
				// Run this through the extension method in case it's really a DataTemplateSelector
				viewTemplate = viewTemplate.SelectDataTemplate(view, itemsView);
 
				// We have a template; turn it into a Forms view 
				var templateElement = viewTemplate.CreateContent() as View;
 
				// Make sure the Visual property is available when the renderer is created
				PropertyPropagationExtensions.PropagatePropertyChanged(null, templateElement, itemsView);
 
				var renderer = GetHandler(templateElement, itemsView.FindMauiContext());
 
				var element = renderer.VirtualView as VisualElement;
 
				// and set the view as its BindingContext
				element.BindingContext = view;
 
				return ((UIView)renderer.PlatformView, element);
			}
 
			if (view is View mauiView)
			{
				// Make sure the Visual property is available when the renderer is created
				PropertyPropagationExtensions.PropagatePropertyChanged(null, mauiView, itemsView);
 
				// No template, and the EmptyView is a Maui view; use that
				// But we need to wrap it in a GeneralWrapperView so it can be measured and arranged
				var wrapperView = new GeneralWrapperView(mauiView, itemsView.FindMauiContext());
				wrapperView.Frame = mauiView.Bounds.ToCGRect();
				return (wrapperView, mauiView);
			}
 
			return (new UILabel { TextAlignment = UITextAlignment.Center, Text = $"{view}" }, null);
		}
	}
}