namespace Just.PreciseMath.Tests.SanityChecks;

public class DoubleDoubleDivisionChecks
{
    public static IEnumerable<TheoryDataRow<DoubleDouble, DoubleDouble, DoubleDouble>> ReferenceCases =>
    [
        (new DoubleDouble(6.0), new DoubleDouble(2.0), new DoubleDouble(3.0)),
        (new DoubleDouble(6.0), new DoubleDouble(3.0), new DoubleDouble(2.0)),
        (new DoubleDouble(5.0), new DoubleDouble(2.0), new DoubleDouble(2.5)),
        (new DoubleDouble(1.0), new DoubleDouble(4.0), new DoubleDouble(0.25)),
        (new DoubleDouble(3.75), new DoubleDouble(1.25), new DoubleDouble(3.0)),
        (new DoubleDouble(65536.0), new DoubleDouble(1024.0), new DoubleDouble(64.0)),
        (DoubleDouble.Parse("812563124576179134546", System.Globalization.CultureInfo.InvariantCulture), new DoubleDouble(2.0), DoubleDouble.Parse("406281562288089567273", System.Globalization.CultureInfo.InvariantCulture)),
        (DoubleDouble.Parse("812563124576179134546", System.Globalization.CultureInfo.InvariantCulture), new DoubleDouble(4.0), DoubleDouble.Parse("203140781144044783636.5", System.Globalization.CultureInfo.InvariantCulture)),
        (DoubleDouble.Parse("812563124576179134546", System.Globalization.CultureInfo.InvariantCulture), new DoubleDouble(8.0), DoubleDouble.Parse("101570390572022391818.25", System.Globalization.CultureInfo.InvariantCulture)),
        (DoubleDouble.Parse("812563124576179134546", System.Globalization.CultureInfo.InvariantCulture), DoubleDouble.Parse("812563124576179134546", System.Globalization.CultureInfo.InvariantCulture), new DoubleDouble(1.0)),
    ];

    [Theory]
    [MemberData(nameof(ReferenceCases))]
    public void DivisionShouldProduceExpectedResults(DoubleDouble left, DoubleDouble right, DoubleDouble expected)
    {
        DoubleDouble result = left / right;

        result.High.ShouldBe(expected.High);
        result.Low.ShouldBe(expected.Low);
        result.ShouldBe(expected);
    }
}