#nullable disable
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using ObjCRuntime;
using UIKit;
 
namespace Microsoft.Maui.Controls.Handlers.Items
{
	internal static class ItemsSourceFactory
	{
		public static IItemsViewSource Create(IEnumerable itemsSource, UICollectionViewController collectionViewController)
		{
			if (itemsSource == null)
			{
				return new EmptySource();
			}
 
			switch (itemsSource)
			{
				case IList _ when itemsSource is INotifyCollectionChanged:
					return new ObservableItemsSource(itemsSource as IList, collectionViewController);
				case IEnumerable _ when itemsSource is INotifyCollectionChanged:
					return new ObservableItemsSource(itemsSource as IEnumerable, collectionViewController);
				case IList list:
					return new ListSource(list);
				case IEnumerable<object> generic:
					return new ListSource(generic);
			}
 
			return new ListSource(itemsSource);
		}
 
		public static IItemsViewSource CreateGrouped(IEnumerable itemsSource, UICollectionViewController collectionViewController)
		{
			if (itemsSource == null)
			{
				return new EmptySource();
			}
 
			return new ObservableGroupedSource(itemsSource, collectionViewController);
		}
 
		public static ILoopItemsViewSource CreateForCarouselView(IEnumerable itemsSource, UICollectionViewController collectionViewController, bool loop)
		{
			if (itemsSource == null)
			{
				return new EmptySource();
			}
 
			switch (itemsSource)
			{
				case IList _ when itemsSource is INotifyCollectionChanged:
					return new LoopObservableItemsSource(itemsSource as IList, collectionViewController, loop);
				case IEnumerable _ when itemsSource is INotifyCollectionChanged:
					return new LoopObservableItemsSource(itemsSource as IEnumerable, collectionViewController, loop);
				case IEnumerable<object> generic:
					return new LoopListSource(generic, loop);
			}
 
			return new LoopListSource(itemsSource, loop);
		}
 
	}
}