using System;
using System.ComponentModel;
using System.Drawing;
using CoreGraphics;
using Microsoft.Maui.Controls.Platform;
using ObjCRuntime;
using UIKit;
 
namespace Microsoft.Maui.Controls.Compatibility.Platform.iOS
{
	[Obsolete("Use Microsoft.Maui.Controls.Handlers.Compatibility.FrameRenderer instead")]
	public class FrameRenderer : VisualElementRenderer<Frame>, ITabStop
	{
		UIView _actualView;
		CGSize _previousSize;
		bool _isDisposed;
 
		UIView ITabStop.TabStop => this;
 
		[Microsoft.Maui.Controls.Internals.Preserve(Conditional = true)]
		public FrameRenderer()
		{
			_actualView = new FrameView();
			AddSubview(_actualView);
		}
 
		public override void AddSubview(UIView view)
		{
			if (view != _actualView)
				_actualView.AddSubview(view);
			else
				base.AddSubview(view);
		}
 
		protected override void OnElementChanged(ElementChangedEventArgs<Frame> e)
		{
			base.OnElementChanged(e);
 
			if (e.NewElement != null)
			{
				SetupLayer();
			}
		}
 
		protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
		{
			base.OnElementPropertyChanged(sender, e);
 
			if (e.PropertyName == VisualElement.BackgroundColorProperty.PropertyName ||
				e.PropertyName == VisualElement.BackgroundProperty.PropertyName ||
				e.PropertyName == Microsoft.Maui.Controls.Frame.BorderColorProperty.PropertyName ||
				e.PropertyName == Microsoft.Maui.Controls.Frame.HasShadowProperty.PropertyName ||
				e.PropertyName == Microsoft.Maui.Controls.Frame.CornerRadiusProperty.PropertyName ||
				e.PropertyName == Microsoft.Maui.Controls.Frame.IsClippedToBoundsProperty.PropertyName ||
				e.PropertyName == VisualElement.IsVisibleProperty.PropertyName)
				SetupLayer();
		}
 
		public override void TraitCollectionDidChange(UITraitCollection previousTraitCollection)
		{
#pragma warning disable CA1422 // Validate platform compatibility
			base.TraitCollectionDidChange(previousTraitCollection);
#pragma warning restore CA1422 // Validate platform compatibility			// Make sure the control adheres to changes in UI theme
			if (Forms.IsiOS13OrNewer && previousTraitCollection?.UserInterfaceStyle != TraitCollection.UserInterfaceStyle)
				SetupLayer();
		}
 
		public virtual void SetupLayer()
		{
			if (_actualView == null)
				return;
 
			float cornerRadius = Element.CornerRadius;
 
			if (cornerRadius == -1f)
				cornerRadius = 5f; // default corner radius
 
			_actualView.Layer.CornerRadius = cornerRadius;
			_actualView.Layer.MasksToBounds = cornerRadius > 0;
 
			if (Element.BackgroundColor == null)
				_actualView.Layer.BackgroundColor = ColorExtensions.BackgroundColor.CGColor;
			else
			{
				// BackgroundColor gets set on the base class too which messes with
				// the corner radius, shadow, etc. so override that behaviour here
				BackgroundColor = UIColor.Clear;
				_actualView.Layer.BackgroundColor = Element.BackgroundColor.ToCGColor();
			}
 
			_actualView.Layer.RemoveBackgroundLayer();
 
			if (!Brush.IsNullOrEmpty(Element.Background))
			{
				var backgroundLayer = this.GetBackgroundLayer(Element.Background);
 
				if (backgroundLayer != null)
				{
					_actualView.Layer.BackgroundColor = UIColor.Clear.CGColor;
					Layer.InsertBackgroundLayer(backgroundLayer, 0);
					backgroundLayer.CornerRadius = cornerRadius;
				}
			}
 
			if (Element.BorderColor == null)
				_actualView.Layer.BorderColor = UIColor.Clear.CGColor;
			else
			{
				_actualView.Layer.BorderColor = Element.BorderColor.ToCGColor();
				_actualView.Layer.BorderWidth = 1;
			}
 
			if (Element.HasShadow)
			{
				Layer.ShadowRadius = 5;
				Layer.ShadowColor = UIColor.Black.CGColor;
				Layer.ShadowOpacity = 0.8f;
				Layer.ShadowOffset = new SizeF();
			}
			else
			{
				Layer.ShadowOpacity = 0;
			}
 
			Layer.RasterizationScale = UIScreen.MainScreen.Scale;
			Layer.ShouldRasterize = true;
			Layer.MasksToBounds = false;
 
			_actualView.Layer.RasterizationScale = UIScreen.MainScreen.Scale;
			_actualView.Layer.ShouldRasterize = true;
			_actualView.Layer.MasksToBounds = Element.IsClippedToBounds;
		}
 
		public override void LayoutSubviews()
		{
			if (_previousSize != Bounds.Size)
			{
				SetNeedsDisplay();
				this.UpdateBackgroundLayer();
			}
 
			base.LayoutSubviews();
		}
 
		public override void Draw(CGRect rect)
		{
			if (_actualView != null)
				_actualView.Frame = Bounds;
 
			base.Draw(rect);
 
			_previousSize = Bounds.Size;
		}
 
		protected override void Dispose(bool disposing)
		{
			if (_isDisposed)
				return;
 
			_isDisposed = true;
 
			base.Dispose(disposing);
 
			if (disposing)
			{
				if (_actualView != null)
				{
					for (var i = 0; i < _actualView.GestureRecognizers?.Length; i++)
						_actualView.GestureRecognizers.Remove(_actualView.GestureRecognizers[i]);
 
					for (var j = 0; j < _actualView.Subviews.Length; j++)
						_actualView.Subviews.Remove(_actualView.Subviews[j]);
 
					_actualView.RemoveFromSuperview();
					_actualView.Dispose();
					_actualView = null;
				}
			}
		}
 
		[Microsoft.Maui.Controls.Internals.Preserve(Conditional = true)]
		class FrameView : UIView
		{
			public override void RemoveFromSuperview()
			{
				for (var i = Subviews.Length - 1; i >= 0; i--)
				{
					var item = Subviews[i];
					item.RemoveFromSuperview();
				}
			}
 
			public override bool PointInside(CGPoint point, UIEvent uievent)
			{
				foreach (var view in Subviews)
				{
					if (view.HitTest(ConvertPointToView(point, view), uievent) != null)
						return true;
				}
 
				return false;
			}
		}
	}
}