using Nonemm.Core;

namespace Nonemm.Spotting.Tests;

public class BandmapTests
{
    private static readonly DateTime Now = new(2026, 5, 30, 12, 0, 0, DateTimeKind.Utc);

    private static Spot At(string call, double kilohertz, DateTime? at = null) =>
        new(Callsign.Parse(call), Frequency.FromKilohertz(kilohertz), at ?? Now, SpotSource.Cluster);

    [Fact]
    public void SpotsComeBackInFrequencyOrder()
    {
        Bandmap map = new();
        map.Add(At("DL1ABC", 14_100));
        map.Add(At("JA1XYZ", 14_010));
        Assert.Equal(["JA1XYZ", "DL1ABC"], map.On(Bands.Band20M).Select(s => s.Call.Text));
    }

    [Fact]
    public void AStationThatMovesKeepsOneEntryOnItsBand()
    {
        Bandmap map = new();
        map.Add(At("DL1ABC", 14_010));
        map.Add(At("DL1ABC", 14_020));
        Spot only = Assert.Single(map.On(Bands.Band20M));
        Assert.Equal(14_020_000, only.Frequency.Hertz);
    }

    [Fact]
    public void TheSameStationOnAnotherBandIsASeparateEntry()
    {
        Bandmap map = new();
        map.Add(At("DL1ABC", 14_010));
        map.Add(At("DL1ABC", 7_010));
        Assert.Equal(2, map.All().Count);
    }

    [Fact]
    public void SpotsOlderThanAnHourAreDropped()
    {
        Bandmap map = new();
        map.Add(At("DL1ABC", 14_010, Now.AddHours(-2)));
        map.Add(At("JA1XYZ", 14_020, Now.AddMinutes(-5)));
        map.DropOlderThan(Now);
        Assert.Equal("JA1XYZ", Assert.Single(map.All()).Call.Text);
    }

    [Fact]
    public void TheNearestSpotInsideTheWindowIsFound()
    {
        Bandmap map = new();
        map.Add(At("DL1ABC", 14_010));
        map.Add(At("JA1XYZ", 14_050));
        Assert.Equal(
            "DL1ABC",
            map.Near(Frequency.FromKilohertz(14_010.2), Frequency.FromKilohertz(0.5))?.Call.Text);
        Assert.Null(map.Near(Frequency.FromKilohertz(14_030), Frequency.FromKilohertz(0.5)));
    }
}