// Copyright (c) 2026 Christoph Wille
//
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//
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//
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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using System.Linq;

using Avalonia.Headless.NUnit;

using AwesomeAssertions;

using ICSharpCode.Decompiler.Metadata;
using ICSharpCode.Decompiler.TypeSystem;
using ICSharpCode.ILSpy.Languages;
using ICSharpCode.ILSpy.Search;

using NUnit.Framework;

namespace ICSharpCode.ILSpy.Tests.Search;

// Search results must carry the same composed icons as the assembly tree: base symbol by
// entity kind, plus accessibility and static overlays. The factory therefore has to go
// through Images.GetIcon (via the tree nodes' GetIcon helpers), not hand out bare base
// images — a bare Images.Field for a private static field loses both mini-overlays.
[TestFixture]
public class SearchResultFactoryIconTests
{
	AvaloniaSearchResultFactory factory = null!;
	ITypeDefinition fixtureType = null!;

	[OneTimeSetUp]
	public void LoadFixtureTypeFromOwnAssembly()
	{
		// Read the fixture entities from this test assembly's own metadata, so the
		// accessibility/static flags come from a real type system, not mocks.
		var path = typeof(SearchResultFactoryIconTests).Assembly.Location;
		var file = new PEFile(path);
		var resolver = new UniversalAssemblyResolver(path, throwOnError: false,
			targetFramework: file.DetectTargetFrameworkId());
		var typeSystem = new DecompilerTypeSystem(file, resolver);
		fixtureType = typeSystem.MainModule.TypeDefinitions
			.Single(t => t.Name == nameof(SearchIconFixture));
		factory = new AvaloniaSearchResultFactory(new CSharpLanguage());
	}

	[AvaloniaTest]
	public void Private_Static_Field_Result_Composes_Static_And_Private_Overlays()
	{
		var field = fixtureType.Fields.Single(f => f.Name == "privateStaticField");

		var result = factory.Create(field);

		var icon = result.Image.Should().BeOfType<LayeredImage>().Subject;
		icon.BaseImage.Should().BeSameAs(Images.Field);
		icon.BaseScale.Should().Be(0.8);
		icon.Overlays.Should().Equal(Images.OverlayStatic, Images.OverlayPrivate);
	}

	[AvaloniaTest]
	public void Nested_Interface_Result_Uses_Interface_Base_Icon()
	{
		var nested = fixtureType.NestedTypes
			.Single(t => t.Name == nameof(SearchIconFixture.INested)).GetDefinition()!;

		var icon = (LayeredImage)factory.Create(nested).Image;

		icon.BaseImage.Should().BeSameAs(Images.Interface);
	}

	[AvaloniaTest]
	public void Nested_Enum_Result_Uses_Enum_Base_Icon()
	{
		var nested = fixtureType.NestedTypes
			.Single(t => t.Name == "NestedEnum").GetDefinition()!;

		var icon = (LayeredImage)factory.Create(nested).Image;

		icon.BaseImage.Should().BeSameAs(Images.Enum);
	}

	[AvaloniaTest]
	public void Protected_Internal_Nested_Type_Gets_Plain_Protected_Overlay()
	{
		var nested = fixtureType.NestedTypes
			.Single(t => t.Name == "NestedProtectedInternal").GetDefinition()!;

		var icon = (LayeredImage)factory.Create(nested).Image;

		// Types map protected-internal to the plain protected badge; only members show
		// the combined protected-internal badge. Matches the WPF frontend's type-only
		// overlay mapping.
		icon.Overlays.Should().Equal(Images.OverlayProtected);
	}

	[AvaloniaTest]
	public void Location_Image_Reflects_Declaring_Type_Icon()
	{
		var field = fixtureType.Fields.Single(f => f.Name == "privateStaticField");

		var result = factory.Create(field);

		// The declaring type (SearchIconFixture) is a top-level internal class.
		var location = result.LocationImage.Should().BeOfType<LayeredImage>().Subject;
		location.BaseImage.Should().BeSameAs(Images.Class);
		location.Overlays.Should().Equal(Images.OverlayInternal);
	}

	[AvaloniaTest]
	public void Internal_Static_Method_Result_Composes_Static_And_Internal_Overlays()
	{
		var method = fixtureType.Methods.Single(m => m.Name == "InternalStaticMethod");

		var icon = (LayeredImage)factory.Create(method).Image;

		icon.BaseImage.Should().BeSameAs(Images.Method);
		icon.Overlays.Should().Equal(Images.OverlayStatic, Images.OverlayInternal);
	}

	[AvaloniaTest]
	public void Protected_Property_Result_Composes_Protected_Overlay()
	{
		var property = fixtureType.Properties.Single(p => p.Name == "ProtectedProperty");

		var icon = (LayeredImage)factory.Create(property).Image;

		icon.BaseImage.Should().BeSameAs(Images.Property);
		icon.Overlays.Should().Equal(Images.OverlayProtected);
	}

	[AvaloniaTest]
	public void Private_Event_Result_Composes_Private_Overlay()
	{
		var @event = fixtureType.Events.Single(e => e.Name == "privateEvent");

		var icon = (LayeredImage)factory.Create(@event).Image;

		icon.BaseImage.Should().BeSameAs(Images.Event);
		icon.Overlays.Should().Equal(Images.OverlayPrivate);
	}

	[AvaloniaTest]
	public void Top_Level_Type_Result_Falls_Back_To_Namespace_Location_Image()
	{
		// A top-level type has no declaring type, so the location column shows its namespace.
		factory.Create(fixtureType).LocationImage.Should().BeSameAs(Images.Namespace);
	}
}

#pragma warning disable CS0169, CS0067 // members exist only as metadata probes for the tests above
class SearchIconFixture
{
	static int privateStaticField;

	internal interface INested { }

	enum NestedEnum { None }

	protected internal class NestedProtectedInternal { }

	internal static void InternalStaticMethod() { }

	protected int ProtectedProperty { get; }

	event System.EventHandler? privateEvent;
}
#pragma warning restore CS0169, CS0067