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using System.Linq;

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

using AwesomeAssertions;

using ILSpy.Metadata;
using ILSpy.ViewModels;

using NUnit.Framework;

namespace ICSharpCode.ILSpy.Tests.Metadata;

[TestFixture]
public class MetadataColumnBuilderTests
{
	sealed class SampleEntry
	{
		public int RID { get; set; }
		[ColumnInfo("X8")]
		public int Token { get; set; }
		public string Name { get; set; } = "";
	}

	[AvaloniaTest]
	public void For_Returns_One_TextColumn_Per_Public_Property_With_Hex_Converter_For_X_Format()
	{
		// The reflection-driven column builder is the bridge between a row-shape struct/class
		// and the DataGrid view. It should produce one column per public property in
		// declaration order; properties annotated with a hex format spec must apply that spec
		// at bind-time (so enum and integer values both line up cleanly).

		var columns = MetadataColumnBuilder.For<SampleEntry>();

		columns.Should().HaveCount(3);
		columns.Select(c => c.Tag).Should().Equal("RID", "Token", "Name");

		var token = (DataGridTextColumn)columns[1];
		token.Binding.Should().NotBeNull();
		token.IsReadOnly.Should().BeTrue();

		var name = (DataGridTextColumn)columns[2];
		name.SortMemberPath.Should().Be("Name");
	}

	[AvaloniaTest]
	public void For_Returns_Fresh_Column_Instances_So_Per_Page_Headers_Stay_Independent()
	{
		// Per-column filter inputs live inside each column's Header, so two pages built
		// from the same row type must hold *separate* DataGridColumn instances — otherwise
		// a filter typed on one tab would echo into the other.
		var first = MetadataColumnBuilder.For<SampleEntry>();
		var second = MetadataColumnBuilder.For<SampleEntry>();
		first.Should().NotBeSameAs(second);
		first.Zip(second, (a, b) => (a, b)).Should()
			.AllSatisfy(p => p.a.Should().NotBeSameAs(p.b));
	}

	[AvaloniaTest]
	public void Populate_Sets_Columns_And_ColumnFilters_In_Matched_Order()
	{
		// The page model uses the ColumnFilters collection to evaluate the row predicate;
		// the view binds each column header's TextBox to the filter at the same index. The
		// order must match Columns exactly or filters would route to the wrong column.
		var page = new MetadataTablePageModel();
		MetadataColumnBuilder.Populate<SampleEntry>(page);

		page.Columns.Should().HaveCount(3);
		page.ColumnFilters.Should().HaveCount(3);
		page.ColumnFilters.Select(f => f.ColumnName).Should().Equal("RID", "Token", "Name");
	}

	sealed class SampleEntryWithToken
	{
		public int RID { get; set; }
		[ColumnInfo("X8", Kind = ColumnKind.Token)]
		public int Method { get; set; }
		public string Name { get; set; } = "";
	}

	[AvaloniaTest]
	public void For_Emits_Template_Column_For_Token_Kind_Properties()
	{
		// Properties annotated Kind=Token render as a DataGridTemplateColumn whose cell is
		// a hyperlink-styled button. Plain Format-only columns stay as text.

		var columns = MetadataColumnBuilder.For<SampleEntryWithToken>();

		columns[0].Should().BeOfType<DataGridTextColumn>("RID has no [ColumnInfo]");
		columns[1].Should().BeOfType<DataGridTemplateColumn>("Method is Kind=Token");
		columns[2].Should().BeOfType<DataGridTextColumn>("Name has no [ColumnInfo]");
	}
}