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using System.Threading.Tasks;

using Avalonia.Headless.NUnit;

using AwesomeAssertions;

using ICSharpCode.ILSpy.Properties;

using ICSharpCode.ILSpy.AppEnv;
using ICSharpCode.ILSpy.Commands;
using ICSharpCode.ILSpy.TreeNodes;

using NUnit.Framework;

namespace ICSharpCode.ILSpy.Tests.Commands;

/// <summary>
/// The File-menu "Generate portable PDB" command is wired to the real <see cref="PdbGenerator"/>
/// (it used to be a not-implemented stub). It is enabled exactly when the selection holds at least
/// one valid loaded assembly, the same gate the context-menu entry uses.
/// </summary>
[TestFixture]
public class GeneratePdbCommandTests
{
	[AvaloniaTest]
	public async Task Generate_Pdb_Command_Tracks_The_Assembly_Selection()
	{
		var (_, vm) = await TestHarness.BootAsync(3);

		var command = AppComposition.Current.GetExport<MainMenuCommandRegistry>()
			.GetCommand(nameof(Resources.GeneratePortable));
		command.Should().NotBeNull("the File menu exposes a Generate portable PDB command");

		vm.AssemblyTreeModel.SelectedItems.Clear();
		command.CanExecute(null).Should().BeFalse("with nothing selected there is no assembly to write a PDB for");

		var coreLib = vm.AssemblyTreeModel.FindCoreLib();
		vm.AssemblyTreeModel.SelectedItems.Clear();
		vm.AssemblyTreeModel.SelectedItems.Add(coreLib);

		command.CanExecute(null).Should().BeTrue("a selected valid assembly enables the command");
	}

	[AvaloniaTest]
	public async Task TryGetAssemblies_Picks_Only_Valid_Assembly_Nodes()
	{
		var (_, vm) = await TestHarness.BootAsync(3);
		var coreLib = vm.AssemblyTreeModel.FindCoreLib();

		PdbGenerator.TryGetAssemblies(new[] { coreLib }, out var assemblies).Should().BeTrue();
		assemblies.Should().ContainSingle().Which.Should().BeSameAs(coreLib.LoadedAssembly);

		// A non-assembly node (a child of the assembly) is not a candidate.
		coreLib.Expand();
		var nonAssembly = coreLib.Children[0];
		(nonAssembly is AssemblyTreeNode).Should().BeFalse("a child of the assembly node is not itself an assembly");
		PdbGenerator.TryGetAssemblies(new[] { nonAssembly }, out var none).Should().BeFalse();
		none.Should().BeEmpty();
	}
}