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

using Avalonia;
using Avalonia.Headless;
using Avalonia.Headless.NUnit;
using Avalonia.Input;
using Avalonia.Interactivity;
using Avalonia.Threading;

using AvaloniaEdit.Rendering;

using AwesomeAssertions;

using ICSharpCode.ILSpy.AppEnv;
using ICSharpCode.ILSpy.Bookmarks;
using ICSharpCode.ILSpy.TextView;
using ICSharpCode.ILSpy.TreeNodes;

using NUnit.Framework;

namespace ICSharpCode.ILSpy.Tests.Bookmarks;

[TestFixture]
public class BookmarkGutterTests
{
	[AvaloniaTest]
	public async Task Clicking_Bookmark_Gutter_Toggles_The_Visible_Line()
	{
		var (window, vm) = await TestHarness.BootAsync(3);
		var manager = AppComposition.Current.GetExport<BookmarkManager>();
		manager.Clear();

		var coreLibName = typeof(object).Assembly.GetName().Name!;
		var typeNode = vm.AssemblyTreeModel.FindNode<TypeTreeNode>(coreLibName, "System", "System.Object");
		vm.AssemblyTreeModel.SelectNode(typeNode);
		await vm.DockWorkspace.WaitForDecompiledTextAsync();

		var view = await window.WaitForComponent<DecompilerTextView>();
		for (int i = 0; i < 8; i++)
		{
			Dispatcher.UIThread.RunJobs();
			await Task.Delay(25);
		}
		window.UpdateLayout();

		var margin = view.Editor.TextArea.LeftMargins.OfType<BookmarkMargin>().Single();
		margin.Bounds.Width.Should().BeGreaterThan(0, "the bookmark gutter must reserve hit-testable space");

		var textView = view.Editor.TextArea.TextView;
		textView.EnsureVisualLines();
		var visualLine = textView.VisualLines.First(line => view.CanToggleBookmarkAtLine(line.FirstDocumentLine.LineNumber));
		int documentLine = visualLine.FirstDocumentLine.LineNumber;
		double y = visualLine.GetTextLineVisualYPosition(visualLine.TextLines[0], VisualYPosition.LineMiddle) - textView.VerticalOffset;
		y.Should().BeInRange(0, margin.Bounds.Height, "the selected visual line must be inside the gutter bounds");
		var point = margin.TranslatePoint(new Point(margin.Bounds.Width / 2, y), window);
		point.Should().NotBeNull("the gutter line coordinate must map into the test window");

		int pressed = 0;
		margin.AddHandler(InputElement.PointerPressedEvent, (_, _) => pressed++, RoutingStrategies.Tunnel | RoutingStrategies.Bubble);

		window.MouseDown(point!.Value, MouseButton.Left);
		window.MouseUp(point.Value, MouseButton.Left);
		Dispatcher.UIThread.RunJobs();

		pressed.Should().BeGreaterThan(0, "the real pointer event must hit the bookmark gutter");
		manager.Bookmarks.Should().ContainSingle();
		view.GetLineForBookmark(manager.Bookmarks[0]).Should().Be(documentLine);

		window.MouseDown(point.Value, MouseButton.Left);
		window.MouseUp(point.Value, MouseButton.Left);
		Dispatcher.UIThread.RunJobs();

		manager.Bookmarks.Should().BeEmpty();
	}

	[AvaloniaTest]
	public async Task RightClicking_Bookmark_Gutter_Does_Not_Toggle()
	{
		var (window, vm) = await TestHarness.BootAsync(3);
		var manager = AppComposition.Current.GetExport<BookmarkManager>();
		manager.Clear();

		var coreLibName = typeof(object).Assembly.GetName().Name!;
		var typeNode = vm.AssemblyTreeModel.FindNode<TypeTreeNode>(coreLibName, "System", "System.Object");
		vm.AssemblyTreeModel.SelectNode(typeNode);
		await vm.DockWorkspace.WaitForDecompiledTextAsync();

		var view = await window.WaitForComponent<DecompilerTextView>();
		for (int i = 0; i < 8; i++)
		{
			Dispatcher.UIThread.RunJobs();
			await Task.Delay(25);
		}
		window.UpdateLayout();

		var margin = view.Editor.TextArea.LeftMargins.OfType<BookmarkMargin>().Single();
		var textView = view.Editor.TextArea.TextView;
		textView.EnsureVisualLines();
		var visualLine = textView.VisualLines.First(line => view.CanToggleBookmarkAtLine(line.FirstDocumentLine.LineNumber));
		double y = visualLine.GetTextLineVisualYPosition(visualLine.TextLines[0], VisualYPosition.LineMiddle) - textView.VerticalOffset;
		var point = margin.TranslatePoint(new Point(margin.Bounds.Width / 2, y), window);
		point.Should().NotBeNull("the gutter line coordinate must map into the test window");

		window.MouseDown(point!.Value, MouseButton.Right);
		window.MouseUp(point.Value, MouseButton.Right);
		Dispatcher.UIThread.RunJobs();

		manager.Bookmarks.Should().BeEmpty("a right-click in the gutter must not toggle a bookmark");

		// The same coordinate still toggles on a left-click, proving the gesture is button-gated
		// rather than disabled at that line.
		window.MouseDown(point.Value, MouseButton.Left);
		window.MouseUp(point.Value, MouseButton.Left);
		Dispatcher.UIThread.RunJobs();

		manager.Bookmarks.Should().ContainSingle("a left-click at the same coordinate still toggles");
	}
}