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

using Avalonia.Controls;
using Avalonia.Headless.NUnit;
using Avalonia.VisualTree;

using AwesomeAssertions;

using ICSharpCode.ILSpyX.TreeView;

using ILSpy;
using ILSpy.AppEnv;
using ILSpy.AssemblyTree;
using ILSpy.TreeNodes;
using ILSpy.ViewModels;
using ILSpy.Views;

using NUnit.Framework;

namespace ICSharpCode.ILSpy.Tests;

[TestFixture]
public class AssemblyTreeContextMenuTests
{
	[AvaloniaTest]
	public async Task ContextMenu_Is_Attached_To_The_Assembly_Tree_Grid()
	{
		// AssemblyListPane wires a context-menu host onto its DataGrid at construction time so
		// any [ExportContextMenuEntry]-tagged commands can drop into the right-click menu
		// without further per-entry plumbing.

		// Arrange + Act — boot the window so the pane materialises.
		var window = AppComposition.Current.GetExport<MainWindow>();
		window.Show();
		var vm = (MainWindowViewModel)window.DataContext!;
		// wait for assemblies to load
		await vm.AssemblyTreeModel.WaitForAssembliesAsync(minimumCount: 1);

		// Assert — TreeGrid carries a ContextMenu. (The menu may be empty if no entries are
		// registered yet; verifies only that the host is in place.)
		var pane = await window.WaitForComponent<AssemblyListPane>();
		var grid = await pane.WaitForComponent<DataGrid>();
		grid.ContextMenu.Should().NotBeNull();
	}

	[AvaloniaTest]
	public async Task Context_Menu_Shows_Visible_Entries_With_Selected_Tree_Nodes_In_Context()
	{
		// When the user right-clicks a tree row, the pane builds a TextViewContext from the
		// current selection and feeds it through ContextMenuProvider.Build with whichever
		// entries the test injects. Visible entries land in the menu; the entry receives the
		// originating tab grid + the selected nodes when invoked.

		// Arrange — boot, select an assembly node, install a stub entry that records the
		// context it sees on Execute.
		var window = AppComposition.Current.GetExport<MainWindow>();
		window.Show();
		var vm = (MainWindowViewModel)window.DataContext!;
		// wait for assemblies to load
		await vm.AssemblyTreeModel.WaitForAssembliesAsync(minimumCount: 1);
		var pane = await window.WaitForComponent<AssemblyListPane>();
		var assemblyNode = vm.AssemblyTreeModel.FindNode<AssemblyTreeNode>("System.Linq");
		// select assemblyNode
		vm.AssemblyTreeModel.SelectNode(assemblyNode);

		TextViewContext? executionContext = null;
		var entry = new RecordingEntry(c => executionContext = c);
		var export = new StubExport(entry, new ContextMenuEntryMetadata { Header = "Probe", Order = 0 });

		// Act 1 — re-attach the context menu with our stub entries.
		pane.AttachContextMenu(new IContextMenuEntryExport[] { export });
		var grid = await pane.WaitForComponent<DataGrid>();
		var menu = grid.ContextMenu!;

		// Trigger the build path the live Opening event would take.
		var built = pane.BuildContextMenuForCurrentState(new IContextMenuEntryExport[] { export });

		// Assert 1 — menu carries our entry.
		built.Should().NotBeNull();
		var item = built!.Items.OfType<MenuItem>().Single();
		((string?)item.Header).Should().Be("Probe");

		// Act 2 — invoke the click handler that the Build attached.
		item.RaiseEvent(new global::Avalonia.Interactivity.RoutedEventArgs(MenuItem.ClickEvent));

		// Assert 2 — entry's Execute saw the right context: the tree grid + the selection.
		executionContext.Should().NotBeNull();
		ReferenceEquals(executionContext!.TreeGrid, grid).Should().BeTrue();
		executionContext.SelectedTreeNodes.Should().NotBeNull();
		executionContext.SelectedTreeNodes!.Should().Contain((SharpTreeNode)assemblyNode);
	}

	sealed class RecordingEntry(System.Action<TextViewContext> onExecute) : IContextMenuEntry
	{
		public bool IsVisible(TextViewContext context) => true;
		public bool IsEnabled(TextViewContext context) => true;
		public void Execute(TextViewContext context) => onExecute(context);
	}

	sealed class StubExport(IContextMenuEntry entry, ContextMenuEntryMetadata metadata) : IContextMenuEntryExport
	{
		public IContextMenuEntry Value { get; } = entry;
		public ContextMenuEntryMetadata Metadata { get; } = metadata;
	}
}