using Nonemm.Core;

namespace Nonemm.Contests.Rules;

/// CQ WPX, CW, SSB and RTTY. Serial numbers are exchanged and the multiplier is
/// the prefix, counted once for the whole contest whatever the band.
public sealed class CqWpx : Contest
{
    /// The rules split the bands at 14 MHz rather than by band name, so 30, 17
    /// and 12 metres fall on the high side even though the contest is not run
    /// on them.
    private static readonly Frequency LowBandLimit = Frequency.FromKilohertz(14_000);

    private readonly ModeCategory mode;

    public CqWpx(ModeCategory mode) => this.mode = mode;

    public string Name => "CQWPX";

    public string DisplayName => $"CQ WPX {ModeLabel()}";

    public string CabrilloName => mode switch
    {
        ModeCategory.Cw => "CQ-WPX-CW",
        ModeCategory.Phone => "CQ-WPX-SSB",
        _ => "CQ-WPX-RTTY",
    };

    public IReadOnlyList<ExchangeField> ExchangeFieldsFor(StationInfo me) =>
    [
        new ExchangeField("RST", ExchangeSlot.ReceivedReport, ExchangeFieldKind.Report),
        new ExchangeField("Nr", ExchangeSlot.SerialNumber, ExchangeFieldKind.Number),
    ];

    public IReadOnlyList<string> MultiplierNames => ["Prefixes"];

    public DupeScope DupeScope => DupeScope.PerBand;

    public bool HasSerialNumbers => true;

    public IReadOnlyList<ModeCategory> Modes => [mode];

    public string SentExchangeFor(StationInfo me) => DefaultReport();

    public int PointsFor(QsoContext qso)
    {
        bool highBand = qso.Qso.Frequency >= LowBandLimit;
        bool rtty = mode == ModeCategory.Digital;
        if (qso.IsSameCountry)
        {
            return rtty ? (highBand ? 1 : 2) : 1;
        }
        if (!qso.IsSameContinent)
        {
            return highBand ? 3 : 6;
        }
        if (rtty || qso.Continent == "NA")
        {
            return highBand ? 2 : 4;
        }
        return highBand ? 1 : 2;
    }

    public IReadOnlyList<Multiplier> MultipliersFor(QsoContext qso)
    {
        string? prefix = qso.Qso.Call.WpxPrefix();
        return prefix is null ? [] : [new Multiplier(1, prefix, "")];
    }

    public int TotalScore(ScoreTally tally) => tally.Points * tally.TotalMultipliers;

    public CabrilloExchange CabrilloExchange(Qso qso, StationInfo me) =>
        new(
            [
                new CabrilloField(me.Callsign, 13),
                new CabrilloField(qso.SentReport, 3),
                new CabrilloField($"{qso.SentNumber:0000}", 6),
            ],
            [
                new CabrilloField(qso.Call.Text, 13),
                new CabrilloField(qso.ReceivedReport, 3),
                new CabrilloField($"{qso.ReceivedNumber:0000}", 6),
            ]);

    private string ModeLabel() => mode switch
    {
        ModeCategory.Cw => "CW",
        ModeCategory.Phone => "SSB",
        _ => "RTTY",
    };

    private string DefaultReport() => mode == ModeCategory.Phone ? "59" : "599";
}