using Nonemm.Core;

namespace Nonemm.Spotting.Tests;

public class SpotJitterTests
{
    private static Spot At(double kilohertz, SpotSource source = SpotSource.Cluster, string comment = "") =>
        new(Callsign.Parse("OM5M"), Frequency.FromKilohertz(kilohertz), DateTime.UtcNow, source, "W3LPL", comment);

    private static long Offset(Spot spot, bool isDupe = false) =>
        SpotJitter.Shifted(spot, BandPlan.Default, new Random(1), isDupe).Frequency.Hertz
            - spot.Frequency.Hertz;

    [Fact]
    public void ACwSpotMovesByThirtyOrSixtyHertz()
    {
        Random random = new(1);
        for (int run = 0; run < 20; run++)
        {
            Spot moved = SpotJitter.Shifted(At(14_025), BandPlan.Default, random);
            Assert.Contains(moved.Frequency.Hertz - 14_025_000, (long[])[-60, -30, 30, 60]);
        }
    }

    [Fact]
    public void APhoneSpotIsLeftWhereItIs() => Assert.Equal(0, Offset(At(14_250)));

    [Fact]
    public void AStationAlreadyWorkedIsLeftWhereItIs() =>
        Assert.Equal(0, Offset(At(14_025), isDupe: true));

    [Fact]
    public void AStationWorkingSplitIsLeftWhereItIs()
    {
        Spot split = At(14_025, comment: "UP 2") with { Qsx = Frequency.FromKilohertz(14_027) };

        Assert.Equal(0, Offset(split));
    }

    [Fact]
    public void OurOwnSpotIsLeftWhereItIs() =>
        Assert.Equal(0, Offset(At(14_025, SpotSource.Operator)));

    [Fact]
    public void AStationPassedToAnotherBandIsLeftWhereItIs() =>
        Assert.Equal(0, Offset(At(14_025, comment: "Passed Station 21025")));
}