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using System.IO;
using System.Threading.Tasks;

using Avalonia.Headless;
using Avalonia.Headless.NUnit;
using Avalonia.Threading;

using ILSpy;
using ILSpy.AppEnv;
using ILSpy.TreeNodes;

using NUnit.Framework;

namespace ICSharpCode.ILSpy.Tests;

[TestFixture]
public class UseNestedNamespaceNodesScreenshot
{
	[AvaloniaTest]
	[Explicit("Visual evidence — requires ILSPY_TESTS_VISIBLE=1 so the headless platform renders.")]
	public async Task Capture_Before_And_After_Toggle()
	{
		var settings = AppComposition.Current.GetExport<SettingsService>().DisplaySettings;
		settings.UseNestedNamespaceNodes = false;

		var (window, vm) = await TestHarness.BootAsync(3);

		var assemblyNode = vm.AssemblyTreeModel.FindNode<AssemblyTreeNode>("System.Linq");
		assemblyNode.IsExpanded = true;
		await Waiters.WaitForAsync(() => assemblyNode.Children.Count > 0);
		Dispatcher.UIThread.RunJobs();

		SaveFrame(window, "before-flat");

		settings.UseNestedNamespaceNodes = true;
		await Waiters.WaitForAsync(() =>
			assemblyNode.Children.Count > 0
				&& assemblyNode.Children[assemblyNode.Children.Count - 1] is NamespaceTreeNode);
		// Re-expand — BindTree replaces the HierarchicalModel and resets visible expansion.
		assemblyNode.IsExpanded = true;
		Dispatcher.UIThread.RunJobs();

		SaveFrame(window, "after-nested");

		settings.UseNestedNamespaceNodes = false;
	}

	static void SaveFrame(global::Avalonia.Controls.Window window, string label)
	{
		var frame = window.CaptureRenderedFrame();
		if (frame is null)
		{
			TestContext.WriteLine($"[{label}] no frame (headless drawing on)");
			return;
		}
		var path = Path.Combine(Path.GetTempPath(),
			$"ilspy-tree-{label}-{System.DateTime.Now:yyyyMMdd-HHmmss}.png");
		frame.Save(path);
		TestContext.WriteLine($"[{label}] saved {path}");
	}
}