// 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.AppEnv;
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 MetadataFilterTests
{
	sealed class SampleEntry
	{
		public int RID { get; set; }
		public string Name { get; set; } = "";
		public string Culture { get; set; } = "";
	}

	[Test]
	public void MatchesFilters_Returns_True_When_All_Column_Filters_Are_Empty()
	{
		// An empty filter set is the identity case — every row passes.
		var entry = new SampleEntry { RID = 1, Name = "System.Runtime" };
		MetadataTablePageModel.MatchesFilters(entry, new[] {
			new ColumnFilter("Name"),
			new ColumnFilter("RID"),
		}).Should().BeTrue();
	}

	[Test]
	public void MatchesFilters_Returns_True_When_Each_Filter_Matches_Its_Column_Case_Insensitively()
	{
		// Per-column filters AND together: every non-empty filter must hit its own column,
		// not just any column. Case-insensitive substring match.
		var entry = new SampleEntry { RID = 1, Name = "System.Runtime", Culture = "neutral" };
		MetadataTablePageModel.MatchesFilters(entry, new[] {
			new ColumnFilter("Name") { Value = "system" },
			new ColumnFilter("Culture") { Value = "NEUTRAL" },
		}).Should().BeTrue();
	}

	[Test]
	public void MatchesFilters_Returns_False_When_A_Filter_Does_Not_Match_Its_Own_Column()
	{
		// Anchored to a single column: "system" in Culture must not match a row whose
		// Culture is "neutral", even though Name contains "System".
		var entry = new SampleEntry { Name = "System.Runtime", Culture = "neutral" };
		MetadataTablePageModel.MatchesFilters(entry, new[] {
			new ColumnFilter("Culture") { Value = "system" },
		}).Should().BeFalse();
	}

	[Test]
	public void MatchesFilters_Returns_False_When_Any_AndEd_Filter_Misses()
	{
		// All filters must match — one missing column is enough to drop the row.
		var entry = new SampleEntry { Name = "System.Runtime", Culture = "neutral" };
		MetadataTablePageModel.MatchesFilters(entry, new[] {
			new ColumnFilter("Name") { Value = "system" },
			new ColumnFilter("Culture") { Value = "invariant" },
		}).Should().BeFalse();
	}

	[Test]
	public void MatchesFilters_Returns_False_When_The_Filtered_Column_Does_Not_Exist_On_The_Row()
	{
		// A filter targeting a non-existent property never matches; surfacing this as "no
		// match" prevents stale filter rows from silently passing rows of a different shape.
		var entry = new SampleEntry { Name = "X" };
		MetadataTablePageModel.MatchesFilters(entry, new[] {
			new ColumnFilter("DoesNotExist") { Value = "anything" },
		}).Should().BeFalse();
	}

	[AvaloniaTest]
	public async Task ColumnFilter_Reduces_Visible_Rows_To_Those_Whose_Column_Contains_The_Substring()
	{
		// Integration check: navigate to the TypeDef table (guaranteed populated for any
		// loaded module) and confirm that setting a Name-column filter shrinks the visible
		// row set to entries whose Name contains the filter, and clearing it restores all.

		var window = AppComposition.Current.GetExport<MainWindow>();
		window.Show();
		var vm = (MainWindowViewModel)window.DataContext!;
		await vm.AssemblyTreeModel.WaitForAssembliesAsync(minimumCount: 1);

		var coreLibName = typeof(object).Assembly.GetName().Name!;
		var assemblyNode = vm.AssemblyTreeModel.FindNode<AssemblyTreeNode>(coreLibName);
		assemblyNode.EnsureLazyChildren();
		var metadataNode = assemblyNode.Children.OfType<MetadataTreeNode>().Single();
		metadataNode.EnsureLazyChildren();
		var tablesNode = metadataNode.Children.OfType<MetadataTablesTreeNode>().Single();
		tablesNode.EnsureLazyChildren();
		var typeDefNode = tablesNode.Children.OfType<TypeDefTableTreeNode>().Single();

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

		var totalCount = tab.Items.Count;
		totalCount.Should().BeGreaterThan(0);

		var nameFilter = tab.ColumnFilters.Single(f => f.ColumnName == "Name");
		nameFilter.Value = "System";

		var visible = tab.Items.Where(e => MetadataTablePageModel.MatchesFilters(e, tab.ColumnFilters)).ToList();
		visible.Should().NotBeEmpty("at least one TypeDef row should mention 'System'");
		visible.Count.Should().BeLessThan(totalCount, "the filter must hide at least one row");

		nameFilter.Value = "";
		var afterClear = tab.Items.Where(e => MetadataTablePageModel.MatchesFilters(e, tab.ColumnFilters)).Count();
		afterClear.Should().Be(totalCount);
	}
}