using MrGameEng.Graphics;
using Xunit;

namespace MrGameEng.Graphics.Tests;

public class LayerRegistryTests
{
    [Fact]
    public void Registry_StartsWithDefaultWorldLayer()
    {
        var registry = new LayerRegistry();

        Assert.Equal(1, registry.Count);
        var layer = registry[LayerId.Default];
        Assert.Equal("Default", layer.Name);
        Assert.Equal(LayerSpace.World, layer.Space);
        Assert.Equal(LayerSortMode.Depth, layer.SortMode);
    }

    [Fact]
    public void Register_AssignsSequentialIds_InDrawOrder()
    {
        var registry = new LayerRegistry();

        var world = registry.Register("World", LayerSpace.World, LayerSortMode.YSort);
        var ui = registry.Register("UI", LayerSpace.Screen);

        Assert.Equal(1, world.Value);
        Assert.Equal(2, ui.Value);
        Assert.Equal(LayerSortMode.YSort, registry[world].SortMode);
        Assert.Equal(LayerSpace.Screen, registry[ui].Space);
    }
}