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

using Avalonia.Headless.NUnit;

using AwesomeAssertions;

using ILSpy;
using ILSpy.AppEnv;
using ILSpy.Commands;
using ILSpy.Docking;
using ILSpy.Metadata;
using ILSpy.Metadata.CorTables;
using ILSpy.TreeNodes;
using ILSpy.ViewModels;
using ILSpy.Views;

using NUnit.Framework;

namespace ICSharpCode.ILSpy.Tests.Metadata;

[TestFixture]
public class MetadataRowActivationTests
{
	[AvaloniaTest]
	public async Task Activating_A_TypeDef_Row_Selects_The_Matching_TypeTreeNode()
	{
		// Open the TypeDef table for CoreLib, pick the row whose Name == "Object", fire
		// RowActivated, and confirm the assembly tree's TypeTreeNode for System.Object
		// is now selected — that's the gateway to the decompiler view.

		var (_, vm) = await TestHarness.BootAsync();

		var typeDefNode = vm.AssemblyTreeModel.FindCoreLib()
			.GetChild<MetadataTreeNode>()
			.GetChild<MetadataTablesTreeNode>()
			.GetChild<TypeDefTableTreeNode>();

		vm.AssemblyTreeModel.SelectNode(typeDefNode);
		var tab = await vm.DockWorkspace.WaitForMetadataTabAsync();

		var objectRow = tab.Items.Cast<TypeDefTableTreeNode.TypeDefEntry>()
			.First(e => e.Name == "Object" && e.Namespace == "System");

		tab.RaiseRowActivated(objectRow);

		await Waiters.WaitForAsync(
			() => vm.AssemblyTreeModel.SelectedItem is TypeTreeNode tn
				&& tn.Member is global::ICSharpCode.Decompiler.TypeSystem.ITypeDefinition td
				&& td.FullName == "System.Object");
		(((TypeTreeNode)vm.AssemblyTreeModel.SelectedItem!).Member
			as global::ICSharpCode.Decompiler.TypeSystem.ITypeDefinition)!
			.FullName.Should().Be("System.Object");
	}

	[AvaloniaTest]
	public async Task Activating_A_Row_With_OpenInNewTab_Spawns_A_Fresh_Decompiler_Tab()
	{
		// Shift+double-click on a metadata row should NOT replace the active tab — it should
		// open a brand-new decompiler tab containing the row's entity. The single-tab-reuse
		// path stays put.
		var (_, vm) = await TestHarness.BootAsync();

		var typeDefNode = vm.AssemblyTreeModel.FindCoreLib()
			.GetChild<MetadataTreeNode>()
			.GetChild<MetadataTablesTreeNode>()
			.GetChild<TypeDefTableTreeNode>();

		vm.AssemblyTreeModel.SelectNode(typeDefNode);
		var metadataTab = await vm.DockWorkspace.WaitForMetadataTabAsync();
		var objectRow = metadataTab.Items.Cast<TypeDefTableTreeNode.TypeDefEntry>()
			.First(e => e.Name == "Object" && e.Namespace == "System");

		var documents = ((ILSpyDockFactory)vm.DockWorkspace.Factory).Documents!;
		var initialCount = documents.VisibleDockables?.Count ?? 0;

		metadataTab.RaiseRowActivated(objectRow, openInNewTab: true);

		await Waiters.WaitForAsync(
			() => (documents.VisibleDockables?.Count ?? 0) > initialCount);
		var decompiledTab = await vm.DockWorkspace.WaitForDecompiledTextAsync();
		decompiledTab.Text.Should().Contain("System.Object");
	}

	[AvaloniaTest]
	public async Task DecompileMetadataRowInNewTab_Entry_Is_Registered()
	{
		// Right-click on a metadata-grid row shows a "Decompile to new tab" entry alongside
		// Go-to-token / Show-in-metadata. Verifies the [ExportContextMenuEntry] is discovered.
		var window = AppComposition.Current.GetExport<MainWindow>();
		window.Show();
		var registry = AppComposition.Current.GetExport<ContextMenuEntryRegistry>();

		registry.Entries.Should().Contain(
			e => e.Value is DecompileMetadataRowInNewTabCommand);
	}
}

internal static class MetadataRowActivationTestExtensions
{
	public static void RaiseRowActivated(this MetadataTablePageModel page, object row, bool openInNewTab = false) =>
		typeof(MetadataTablePageModel)
			.GetMethod("RaiseRowActivated", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance)!
			.Invoke(page, [row, openInNewTab]);
}