// Copyright (c) 2026 AlphaSierraPapa for the SharpDevelop Team
//
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using System.Linq;
using System.Threading.Tasks;

using AvaloniaEdit.Document;

using Avalonia.Headless.NUnit;

using AwesomeAssertions;

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

using NUnit.Framework;

namespace ICSharpCode.ILSpy.Tests.Bookmarks;

// End-to-end anchoring against real decompiled output: a statement line yields a body anchor,
// a definition line yields a token anchor, and a comment line yields nothing.
[TestFixture]
public class BookmarkAnchoringTests
{
	[AvaloniaTest]
	public async Task Decompiled_type_offers_both_body_and_token_anchors()
	{
		var (_, vm) = await TestHarness.BootAsync(3);
		var csharp = AppComposition.Current.GetExport<LanguageService>().Languages.First(l => l.Name == "C#");

		var asm = vm.AssemblyTreeModel.FindNode<AssemblyTreeNode>("System.Linq");
		var typeSystem = asm!.LoadedAssembly.GetTypeSystemOrNull();
		var type = typeSystem!.MainModule.TypeDefinitions.First(t => t.FullName == "System.Linq.Enumerable");

		var output = new AvaloniaEditTextOutput();
		csharp.DecompileType(type, output, new DecompilationOptions(new DecompilerSettings()));

		var document = new TextDocument(output.GetText());
		var debugInfo = new DecompiledDebugInfo(output.MethodDebugInfos);

		Bookmark? body = null, token = null;
		for (int line = 1; line <= document.LineCount; line++)
		{
			var bookmark = BookmarkAnchoring.CreateForLine(debugInfo, output.References, document, line);
			if (bookmark?.Kind == BookmarkKind.Body)
				body ??= bookmark;
			else if (bookmark?.Kind == BookmarkKind.Token)
				token ??= bookmark;
		}

		body.Should().NotBeNull("statement lines must produce a body anchor");
		token.Should().NotBeNull("definition lines must produce a token anchor");


		// Line 1 is the "// <assembly name>" comment: neither a statement nor a definition,
		// so it falls back to the visible line in the current decompiled document.
		var fallback = BookmarkAnchoring.CreateForLine(debugInfo, output.References, document, 1, type);
		fallback.Should().NotBeNull();
		fallback!.Kind.Should().Be(BookmarkKind.Line);
		fallback.LineNumber.Should().Be(1);
		fallback.Token.Should().Be((uint)System.Reflection.Metadata.Ecma335.MetadataTokens.GetToken(type.MetadataToken));
	}
}