using Godosa.Core.Input;
using Xunit;

namespace Godosa.Core.Tests.Input;

public class MenuCursorTests
{
    [Fact]
    public void Move_WrapsAround()
    {
        var c = new MenuCursor();
        c.Clamp(3);

        c.Move(-1, 3);
        Assert.Equal(2, c.Index);
        c.Move(+1, 3);
        Assert.Equal(0, c.Index);
        c.Move(+1, 3);
        Assert.Equal(1, c.Index);
    }

    [Fact]
    public void Clamp_KeepsIndexInsideAShrinkingList_AndEmptyMeansNone()
    {
        var c = new MenuCursor();
        c.Clamp(5);
        c.Move(+1, 5);
        c.Move(+1, 5);
        c.Move(+1, 5);

        c.Clamp(2);
        Assert.Equal(1, c.Index);

        c.Clamp(0);
        Assert.Equal(-1, c.Index);
        c.Move(+1, 0);
        Assert.Equal(-1, c.Index);

        c.Clamp(4);
        Assert.Equal(0, c.Index);
    }
}