using System;
using System.Collections.Generic;
using System.ComponentModel;
using Microsoft.Maui.Controls.Platform;
using ObjCRuntime;
using UIKit;
using RectangleF = CoreGraphics.CGRect;
 
namespace Microsoft.Maui.Controls.Compatibility.Platform.iOS
{
	[Obsolete("Use Microsoft.Maui.Controls.Handlers.Compatibility.TableViewRenderer instead")]
	public class TableViewRenderer : ViewRenderer<TableView, UITableView>
	{
		const int DefaultRowHeight = 44;
		KeyboardInsetTracker _insetTracker;
		UIView _originalBackgroundView;
		RectangleF _previousFrame;
 
		[Microsoft.Maui.Controls.Internals.Preserve(Conditional = true)]
		public TableViewRenderer()
		{
 
		}
 
		public override SizeRequest GetDesiredSize(double widthConstraint, double heightConstraint)
		{
			return Control.GetSizeRequest(widthConstraint, heightConstraint, DefaultRowHeight, DefaultRowHeight);
		}
 
		public override void LayoutSubviews()
		{
			base.LayoutSubviews();
 
			if (_previousFrame != Frame)
			{
				_previousFrame = Frame;
				_insetTracker?.UpdateInsets();
			}
		}
 
		protected override void Dispose(bool disposing)
		{
			if (disposing && _insetTracker != null)
			{
				_insetTracker.Dispose();
				_insetTracker = null;
 
				var viewsToLookAt = new Stack<UIView>(Subviews);
				while (viewsToLookAt.Count > 0)
				{
					var view = viewsToLookAt.Pop();
					var viewCellRenderer = view as ViewCellRenderer.ViewTableCell;
					if (viewCellRenderer != null)
						viewCellRenderer.Dispose();
					else
					{
						foreach (var child in view.Subviews)
							viewsToLookAt.Push(child);
					}
				}
			}
 
			base.Dispose(disposing);
		}
 
		protected override UITableView CreateNativeControl()
		{
			return new UITableView(RectangleF.Empty, GetTableViewStyle(Element?.Intent ?? TableIntent.Data));
		}
 
		protected UITableViewStyle GetTableViewStyle(TableIntent intent)
		{
			return intent == TableIntent.Data ? UITableViewStyle.Plain : UITableViewStyle.Grouped;
		}
 
		protected override void OnElementChanged(ElementChangedEventArgs<TableView> e)
		{
			if (e.NewElement != null)
			{
				var style = GetTableViewStyle(e.NewElement.Intent);
 
				if (Control == null || Control.Style != style)
				{
					if (Control != null)
					{
						_insetTracker.Dispose();
						Control.Dispose();
					}
 
					var tv = CreateNativeControl();
					_originalBackgroundView = tv.BackgroundView;
 
					SetNativeControl(tv);
					tv.CellLayoutMarginsFollowReadableWidth = false;
 
					_insetTracker = new KeyboardInsetTracker(tv, () => Control.Window, insets => Control.ContentInset = Control.ScrollIndicatorInsets = insets, point =>
					{
						var offset = Control.ContentOffset;
						offset.Y += point.Y;
						Control.SetContentOffset(offset, true);
					}, this);
				}
 
				SetSource();
				UpdateRowHeight();
				UpdateEstimatedRowHeight();
				UpdateBackgroundView();
			}
 
			base.OnElementChanged(e);
		}
 
		protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
		{
			base.OnElementPropertyChanged(sender, e);
 
			if (e.PropertyName == TableView.RowHeightProperty.PropertyName)
				UpdateRowHeight();
			else if (e.PropertyName == TableView.HasUnevenRowsProperty.PropertyName)
				SetSource();
			else if (e.PropertyName == VisualElement.BackgroundColorProperty.PropertyName || e.PropertyName == VisualElement.BackgroundProperty.PropertyName)
				UpdateBackgroundView();
		}
 
		protected override void UpdateNativeWidget()
		{
			if (Element.Opacity < 1)
			{
				if (!Control.Layer.ShouldRasterize)
				{
					Control.Layer.RasterizationScale = UIScreen.MainScreen.Scale;
					Control.Layer.ShouldRasterize = true;
				}
			}
			else
				Control.Layer.ShouldRasterize = false;
			base.UpdateNativeWidget();
		}
 
		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 cells adhere to changes UI theme
			if (Forms.IsiOS13OrNewer && previousTraitCollection?.UserInterfaceStyle != TraitCollection.UserInterfaceStyle)
				Control.ReloadData();
		}
 
		void SetSource()
		{
			var modeledView = Element;
			Control.Source = modeledView.HasUnevenRows ? new UnEvenTableViewModelRenderer(modeledView) : new TableViewModelRenderer(modeledView);
		}
 
		void UpdateBackgroundView()
		{
			Control.BackgroundView = Element.BackgroundColor == null ? _originalBackgroundView : null;
			Control.BackgroundView.UpdateBackground(Element.Background);
		}
 
		void UpdateRowHeight()
		{
			var rowHeight = Element.RowHeight;
			if (Element.HasUnevenRows && rowHeight == -1)
			{
				Control.RowHeight = UITableView.AutomaticDimension;
			}
			else
				Control.RowHeight = rowHeight <= 0 ? DefaultRowHeight : rowHeight;
		}
 
		void UpdateEstimatedRowHeight()
		{
			var rowHeight = Element.RowHeight;
			if (Element.HasUnevenRows && rowHeight == -1)
			{
				Control.EstimatedRowHeight = DefaultRowHeight;
			}
			else
			{
				Control.EstimatedRowHeight = 0;
			}
		}
	}
}