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using System.Linq;
using System.Threading.Tasks;

using Avalonia.Controls;
using Avalonia.Headless.NUnit;
using Avalonia.Threading;
using Avalonia.VisualTree;

using AwesomeAssertions;

using Dock.Avalonia.Controls;

using ILSpy.AppEnv;
using ILSpy.TextView;
using ILSpy.ViewModels;
using ILSpy.Views;

using NUnit.Framework;

namespace ICSharpCode.ILSpy.Tests.Docking;

/// <summary>
/// PROTOTYPE check: with MultiRowTabStripBehavior enabled (App.axaml), many document tabs flow onto
/// multiple rows (a WrapPanel) instead of a single scrolling row.
/// </summary>
[TestFixture]
public class MultiRowTabStripTests
{
	[AvaloniaTest]
	public async Task Many_Document_Tabs_Wrap_To_Multiple_Rows()
	{
		var window = AppComposition.Current.GetExport<MainWindow>();
		window.Show();
		var vm = (MainWindowViewModel)window.DataContext!;
		await vm.AssemblyTreeModel.WaitForAssembliesAsync(minimumCount: 1);

		for (int i = 0; i < 40; i++)
			vm.DockWorkspace.OpenNewTab(new DecompilerTabPageModel { Title = $"Tab number {i:00}" });

		for (int i = 0; i < 12; i++)
		{
			Dispatcher.UIThread.RunJobs();
			window.UpdateLayout();
			await Task.Delay(20);
		}

		var strip = window.GetVisualDescendants().OfType<DocumentTabStrip>().FirstOrDefault();
		strip.Should().NotBeNull("the document tab strip must be realised");

		strip!.GetVisualDescendants().OfType<WrapPanel>().Should().NotBeEmpty(
			"the behaviour must swap the strip's ItemsPanel to a WrapPanel");

		var rows = strip.GetVisualDescendants().OfType<DocumentTabStripItem>()
			.Where(it => it.Bounds.Width > 0)
			.Select(it => System.Math.Round(it.Bounds.Y))
			.Distinct().ToList();

		rows.Count.Should().BeGreaterThan(1, "40 tabs must wrap onto more than one row");
	}
}