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using System.IO;
using System.Linq;

using AwesomeAssertions;

using ICSharpCode.ILSpy.Util;

using NUnit.Framework;

namespace ICSharpCode.ILSpy.Tests;

[TestFixture]
public class ShellHelperTests
{
	// Revealing several selected assemblies must collapse to one file-manager window per
	// containing folder (the WPF SHOpenFolderAndSelectItems behaviour), not one window per
	// file. GroupByFolder is the pure seam that produces those groups.

	static string Combine(params string[] parts) => Path.Combine(parts);

	[Test]
	public void Files_In_The_Same_Folder_Form_A_Single_Group()
	{
		var dir = Combine("root", "bin");
		var a = Combine(dir, "A.dll");
		var b = Combine(dir, "B.dll");

		var groups = ShellHelper.GroupByFolder(new[] { a, b });

		groups.Should().HaveCount(1);
		groups[0].Folder.Should().Be(dir);
		groups[0].Files.Should().Equal(a, b);
	}

	[Test]
	public void Files_In_Different_Folders_Form_Separate_Groups_In_First_Seen_Order()
	{
		var dir1 = Combine("root", "one");
		var dir2 = Combine("root", "two");
		var a = Combine(dir1, "A.dll");
		var b = Combine(dir2, "B.dll");
		var c = Combine(dir1, "C.dll");

		var groups = ShellHelper.GroupByFolder(new[] { a, b, c });

		// dir1 seen first; C.dll joins dir1's existing group rather than starting a new one.
		groups.Select(g => g.Folder).Should().Equal(dir1, dir2);
		groups[0].Files.Should().Equal(a, c);
		groups[1].Files.Should().Equal(b);
	}

	[Test]
	public void Duplicate_Paths_Are_Removed_Case_Insensitively()
	{
		var dir = Combine("root", "bin");
		var a = Combine(dir, "A.dll");

		var groups = ShellHelper.GroupByFolder(new[] { a, a.ToUpperInvariant() });

		groups.Should().HaveCount(1);
		groups[0].Files.Should().Equal(a);
	}

	[Test]
	public void Empty_And_Directory_Less_Entries_Are_Skipped()
	{
		var dir = Combine("root", "bin");
		var a = Combine(dir, "A.dll");

		// null, empty, and a bare file name (no containing directory) are dropped.
		var groups = ShellHelper.GroupByFolder(new[] { null, "", "bare.dll", a });

		groups.Should().HaveCount(1);
		groups[0].Folder.Should().Be(dir);
		groups[0].Files.Should().Equal(a);
	}

	[Test]
	public void No_Usable_Paths_Yields_No_Groups()
	{
		ShellHelper.GroupByFolder(System.Array.Empty<string>()).Should().BeEmpty();
		ShellHelper.GroupByFolder(null!).Should().BeEmpty();
	}
}