namespace QWERTYkez.Mensura.Tests;

public class CollectionsRootOfCubeExtensions
{
    [Fact]
    public void Cbrt_Array_CalculatesCorrectly()
    {
        Length[] source = [new(4), new(9), new(16), new(25)];
        // Ожидаем корень, но важно: Math.Sqrt(4) = 2. 
        // Если ваш код делает специфичные преобразования, адаптируйте Assert.
        var result = source.Cbrt<Length, Length>();

        Assert.Equal(2, result[0]._Value);
        Assert.Equal(3, result[1]._Value);
        Assert.Equal(4, result[2]._Value);
        Assert.Equal(5, result[3]._Value);
    }

    [Fact]
    public void Cbrt_NullableArray_HandlesNulls()
    {
        Length?[] source = [new(16), null, new(36)];
        var result = source.Cbrt<Length, Length>();

        Assert.Equal(4, result[0]?._Value);
        Assert.Null(result[1]);
        Assert.Equal(6, result[2]?._Value);
    }

    [Fact]
    public void Cbrt_DestinationTooShort_ThrowsArgumentException()
    {
        Length[] source = [new(1), new(4)];
        Length[] dest = new Length[1];

        Assert.Throws<ArgumentException>(() => source.Cbrt(dest));
    }

    [Fact]
    public void Cbrt_List_WorksCorrectly()
    {
        var list = new List<Length> { new(1), new(4) };
        var result = list.Cbrt<Length, Length>();

        Assert.Equal(2, result.Count);
        Assert.Equal(1, result[0]._Value);
        Assert.Equal(2, result[1]._Value);
    }

    [Fact]
    public void Cbrt_IEnumerable_NoExtraAllocations()
    {
        IEnumerable<Length> source = new HashSet<Length> { new(9), new(81) };
        var result = source.Cbrt<Length, Length>().ToList();

        Assert.Contains(result, x => x._Value == 3);
        Assert.Contains(result, x => x._Value == 9);
    }
}