namespace Just.PreciseMath.Tests.SanityChecks;

public class DoubleDoubleMultiplicationChecks
{
    public static IEnumerable<TheoryDataRow<DoubleDouble, DoubleDouble, DoubleDouble>> ReferenceCases =>
    [
        (new DoubleDouble(1.0), new DoubleDouble(1.0), new DoubleDouble(1.0)),
        (new DoubleDouble(2.0), new DoubleDouble(3.0), new DoubleDouble(6.0)),
        (new DoubleDouble(1.25), new DoubleDouble(2.5), new DoubleDouble(3.125)),
        (new DoubleDouble(-1.25), new DoubleDouble(2.5), new DoubleDouble(-3.125)),
        (new DoubleDouble(65535.0), new DoubleDouble(65536.0), new DoubleDouble(4294901760.0)),
        (new DoubleDouble(65536.0), new DoubleDouble(65536.0), new DoubleDouble(4294967296.0)),
        (DoubleDouble.Parse("812563124576179134546", System.Globalization.CultureInfo.InvariantCulture), new DoubleDouble(2.0), DoubleDouble.Parse("1625126249152358269092", System.Globalization.CultureInfo.InvariantCulture)),
        (DoubleDouble.Parse("812563124576179134546", System.Globalization.CultureInfo.InvariantCulture), new DoubleDouble(0.5), DoubleDouble.Parse("406281562288089567273", System.Globalization.CultureInfo.InvariantCulture)),
        (DoubleDouble.Parse("812563124576179134546", System.Globalization.CultureInfo.InvariantCulture), new DoubleDouble(27.0), DoubleDouble.Parse("21939204363556836632742", System.Globalization.CultureInfo.InvariantCulture)),
        (DoubleDouble.Parse("812563124576179134546", System.Globalization.CultureInfo.InvariantCulture), new DoubleDouble(127.0), DoubleDouble.Parse("103195516821174750087342", System.Globalization.CultureInfo.InvariantCulture)),
    ];

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

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