using System;
using UIKit;
using PlatformView = UIKit.UIView;
 
namespace Microsoft.Maui.Handlers
{
	public partial class BorderHandler : ViewHandler<IBorderView, ContentView>
	{
		protected override ContentView CreatePlatformView()
		{
			_ = VirtualView ?? throw new InvalidOperationException($"{nameof(VirtualView)} must be set to create a {nameof(ContentView)}");
			_ = MauiContext ?? throw new InvalidOperationException($"{nameof(MauiContext)} cannot be null");
 
			return new ContentView
			{
				CrossPlatformLayout = VirtualView
			};
		}
 
		protected override void DisconnectHandler(ContentView platformView)
		{
			base.DisconnectHandler(platformView);
 
			platformView.ClearSubviews();
		}
 
		public override void SetVirtualView(IView view)
		{
			base.SetVirtualView(view);
 
			_ = PlatformView ?? throw new InvalidOperationException($"{nameof(PlatformView)} should have been set by base class.");
			_ = VirtualView ?? throw new InvalidOperationException($"{nameof(VirtualView)} should have been set by base class.");
 
			PlatformView.View = VirtualView;
			PlatformView.CrossPlatformLayout = VirtualView;
		}
 
		static partial void UpdateContent(IBorderHandler handler)
		{
			_ = handler.PlatformView ?? throw new InvalidOperationException($"{nameof(PlatformView)} should have been set by base class.");
			_ = handler.VirtualView ?? throw new InvalidOperationException($"{nameof(VirtualView)} should have been set by base class.");
			_ = handler.MauiContext ?? throw new InvalidOperationException($"{nameof(MauiContext)} should have been set by base class.");
 
			// Cleanup the old view when reused
			var platformView = handler.PlatformView;
			platformView.ClearSubviews();
 
			if (handler.VirtualView.PresentedContent is IView content)
			{
				var platformContent = content.ToPlatform(handler.MauiContext);
 
				// If the content is a UIScrollView, we need a container to handle masks and clip shapes effectively.
				if (platformContent is UIScrollView)
				{
					var containerView = new UIView
					{
						AutoresizingMask = UIViewAutoresizing.FlexibleHeight | UIViewAutoresizing.FlexibleWidth
					};
 
					containerView.Tag = ContentView.ContentTag;
					containerView.AddSubview(platformContent);
					platformView.AddSubview(containerView);
				}
				else
				{
					platformContent.Tag = ContentView.ContentTag;
					platformView.AddSubview(platformContent);
				}
			}
		}
	}
}