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using System.Linq;
using System.Reflection;

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

using AwesomeAssertions;

using ILSpy.Metadata;

using NUnit.Framework;

namespace ICSharpCode.ILSpy.Tests.Metadata;

/// <summary>
/// The rich flags tooltip breaks an enum value into per-bit groups: multiple-choice groups render a
/// checkbox per flag with the set bits checked, single-choice groups render the selected member of a
/// mutually exclusive sub-range. (Regression: the Avalonia port had only a plain-text fallback.)
/// </summary>
[TestFixture]
public class FlagsTooltipTests
{
	[AvaloniaTest]
	public void MultipleChoiceGroup_Checks_The_Set_Bits()
	{
		var group = FlagGroup.CreateMultipleChoiceGroup(typeof(MethodAttributes), "Flags:",
			(int)MethodAttributes.Static, (int)MethodAttributes.Static, includeAll: false);

		var view = (StackPanel)group.Build();
		var statik = view.Children.OfType<CheckBox>()
			.Single(c => ((string?)c.Content)!.StartsWith("Static"));
		statik.IsChecked.Should().BeTrue("the Static bit is set in the selected value");
	}

	[AvaloniaTest]
	public void SingleChoiceGroup_Shows_The_Selected_Member()
	{
		var group = FlagGroup.CreateSingleChoiceGroup(typeof(MethodAttributes), "Accessibility: ",
			(int)MethodAttributes.MemberAccessMask, (int)MethodAttributes.Public, includeAny: false);

		group.SelectedFlag.Name.Should().StartWith("Public");
	}

	[AvaloniaTest]
	public void MetadataCellTooltip_Renders_A_FlagsTooltip_As_A_Control()
	{
		var entry = new EntryWithFlags();
		var resolved = MetadataCellTooltip.Resolve(entry, "Attributes");
		resolved.Should().BeAssignableTo<Control>("a FlagsTooltip value renders as the rich control");
	}

	sealed class EntryWithFlags
	{
		public MethodAttributes Attributes => MethodAttributes.Public | MethodAttributes.Static;

		public object AttributesTooltip => new FlagsTooltip {
			FlagGroup.CreateSingleChoiceGroup(typeof(MethodAttributes), "Accessibility: ",
				(int)MethodAttributes.MemberAccessMask, (int)(Attributes & MethodAttributes.MemberAccessMask), includeAny: false),
			FlagGroup.CreateMultipleChoiceGroup(typeof(MethodAttributes), "Flags:",
				~(int)MethodAttributes.MemberAccessMask, (int)Attributes, includeAll: false),
		};
	}
}