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using System.Threading.Tasks;

using Avalonia.Headless.NUnit;

using AwesomeAssertions;

using ICSharpCode.ILSpy.TreeNodes;

using NUnit.Framework;

namespace ICSharpCode.ILSpy.Tests;

/// <summary>
/// <c>AssemblyTreeModel.FindTreeNode</c> must resolve non-entity references -- a whole assembly
/// (LoadedAssembly / MetadataFile) and a namespace -- to their tree nodes, not just entities.
/// (Regression: the Avalonia port only handled entity references, so Assembly/Namespace search
/// results and resource/namespace links silently did nothing.)
/// </summary>
[TestFixture]
public class FindTreeNodeReferenceTests
{
	[AvaloniaTest]
	public async Task FindTreeNode_Resolves_Assembly_And_Namespace_References()
	{
		var (_, vm) = await TestHarness.BootAsync(3);
		var atm = vm.AssemblyTreeModel;

		var asmNode = atm.FindNode<AssemblyTreeNode>("System.Linq");
		Assert.That(asmNode, Is.Not.Null);
		var loaded = asmNode!.LoadedAssembly;

		// LoadedAssembly reference -> its assembly node. (Custom TreeNodeAssertions shadows
		// .Should() on tree nodes, so use Assert.That here.)
		Assert.That(atm.FindTreeNode(loaded), Is.SameAs(asmNode),
			"a LoadedAssembly reference resolves to its assembly node");

		// MetadataFile reference -> the same assembly node.
		var metadataFile = loaded.GetMetadataFileOrNull();
		Assert.That(metadataFile, Is.Not.Null);
		Assert.That(atm.FindTreeNode(metadataFile), Is.SameAs(asmNode),
			"a MetadataFile reference resolves to its assembly node");

		// Namespace reference -> its namespace node.
		var compilation = loaded.GetTypeSystemOrNull();
		Assert.That(compilation, Is.Not.Null);
		var ns = compilation!.MainModule.RootNamespace.GetChildNamespace("System")?.GetChildNamespace("Linq");
		Assert.That(ns, Is.Not.Null);

		Assert.That(atm.FindTreeNode(ns), Is.InstanceOf<NamespaceTreeNode>(),
			"a namespace reference resolves to its namespace node");
	}
}