using System;
using System.ComponentModel;
using Android.Views;
using Android.Widget;
using Microsoft.Maui.Controls.Platform;
using AView = Android.Views.View;
 
namespace Microsoft.Maui.Controls.Compatibility.Platform.Android.FastRenderers
{
	internal class AutomationPropertiesProvider : IDisposable
	{
		string _defaultContentDescription;
		string _defaultHint;
		bool _disposed;
 
		IVisualElementRenderer _renderer;
 
		public AutomationPropertiesProvider(IVisualElementRenderer renderer)
		{
			_renderer = renderer;
			_renderer.ElementPropertyChanged += OnElementPropertyChanged;
			_renderer.ElementChanged += OnElementChanged;
		}
 
		AView Control => _renderer?.View;
 
		VisualElement Element => _renderer?.Element;
 
		public void Dispose()
		{
			Dispose(true);
			GC.SuppressFinalize(this);
		}
 
		protected virtual void Dispose(bool disposing)
		{
			if (_disposed)
			{
				return;
			}
 
			_disposed = true;
 
			if (Element != null)
			{
				Element.PropertyChanged -= OnElementPropertyChanged;
			}
 
			if (_renderer != null)
			{
				_renderer.ElementChanged -= OnElementChanged;
				_renderer.ElementPropertyChanged -= OnElementPropertyChanged;
 
				_renderer = null;
			}
		}
 
		void SetContentDescription()
			=> Controls.Platform.AutomationPropertiesProvider.SetContentDescription(Control, Element, _defaultContentDescription, _defaultHint);
 
		void SetImportantForAccessibility()
			=> Controls.Platform.AutomationPropertiesProvider.SetImportantForAccessibility(Control, Element);
 
		void SetLabeledBy()
			=> Controls.Platform.AutomationPropertiesProvider.SetLabeledBy(Control, Element);
 
		bool _defaultsSet;
		void SetupDefaults()
		{
			if (_defaultsSet || Control == null)
				return;
 
			_defaultsSet = true;
			Controls.Platform.AutomationPropertiesProvider.SetupDefaults(Control, ref _defaultHint, ref _defaultContentDescription);
		}
 
		void OnElementChanged(object sender, VisualElementChangedEventArgs e)
		{
			if (e.OldElement != null)
			{
				e.OldElement.PropertyChanged -= OnElementPropertyChanged;
			}
 
			if (e.NewElement != null)
			{
				e.NewElement.PropertyChanged += OnElementPropertyChanged;
			}
 
			SetupDefaults();
			Controls.Platform.AutomationPropertiesProvider.AccessibilitySettingsChanged(Control, Element, _defaultHint, _defaultContentDescription);
		}
 
		void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
		{
#pragma warning disable CS0618 // Type or member is obsolete
			if (e.PropertyName == AutomationProperties.HelpTextProperty.PropertyName)
			{
				SetContentDescription();
			}
			else if (e.PropertyName == AutomationProperties.NameProperty.PropertyName)
			{
				SetContentDescription();
			}
			else if (e.PropertyName == AutomationProperties.IsInAccessibleTreeProperty.PropertyName)
			{
				SetImportantForAccessibility();
			}
			else if (e.PropertyName == AutomationProperties.LabeledByProperty.PropertyName)
			{
				SetLabeledBy();
			}
#pragma warning restore CS0618 // Type or member is obsolete
		}
	}
}