Nonemm/src/Nonemm.Contests/Rules/UkrainianDx.cs

using Nonemm.Core;
using Nonemm.Core.Country;

namespace Nonemm.Contests.Rules;

/// The Ukrainian DX contest. A Ukrainian station sends its oblast, everyone
/// else a serial number, and a contact with Ukraine is worth 10 points to a
/// station outside it. The multipliers are the countries and the oblasts, each
/// once per band.
public sealed class UkrainianDx : Contest
{
    public string Name => "UKRAINDX";

    public string DisplayName => "Ukrainian DX";

    public string CabrilloName => "UKRAINIAN-DX";

    public IReadOnlyList<ExchangeField> ExchangeFieldsFor(StationInfo me) => IsUkrainian(me.CountryPrefix)
        ?
        [
            new ExchangeField("Snt", ExchangeSlot.SentReport, ExchangeFieldKind.Report, IsRequired: false),
            new ExchangeField("Rcv", ExchangeSlot.ReceivedReport, ExchangeFieldKind.Report),
            new ExchangeField("Exch", ExchangeSlot.Exchange1, ExchangeFieldKind.Text) { Width = 3 },
        ]
        :
        [
            new ExchangeField("Snt", ExchangeSlot.SentReport, ExchangeFieldKind.Report, IsRequired: false),
            new ExchangeField("SntNR", ExchangeSlot.SentNumber, ExchangeFieldKind.Number, IsRequired: false),
            new ExchangeField("Rcv", ExchangeSlot.ReceivedReport, ExchangeFieldKind.Report),
            new ExchangeField("Exch", ExchangeSlot.Exchange1, ExchangeFieldKind.Text) { Width = 3 },
        ];

    /// A number is the serial everyone outside Ukraine sends; anything else is
    /// an oblast, which goes in the section column as well.
    public Qso FromExchange1(Qso qso, string typed) =>
        int.TryParse(typed, out int number)
            ? qso with { ReceivedNumber = number, Section = "" }
            : qso with { ReceivedNumber = 0, Section = typed.Trim().ToUpperInvariant() };

    /// N1MM's log for this contest keeps what the one box was sorted into in a
    /// column of its own beside the exchange.
    public IReadOnlyList<ExchangeField> LogFieldsFor(StationInfo me) =>
    [
        .. ExchangeFieldsFor(me),
        new ExchangeField("Sect", ExchangeSlot.Section, ExchangeFieldKind.Text) { Width = 5 },
    ];

    public IReadOnlyList<string> MultiplierNamesFor(StationInfo me) => ["Countries", "Oblasts"];

    public DupeScope DupeScope => DupeScope.PerBandAndMode;

    public bool HasSerialNumbers => true;

    public IReadOnlyList<ModeCategory> Modes => [ModeCategory.Cw, ModeCategory.Phone];

    public string SentExchangeFor(StationInfo me) =>
        IsUkrainian(me.CountryPrefix) ? me.County : "001";

    /// What went out on this contact. A Ukrainian station sends the same
    /// oblast every time; everyone else sends a serial, so the Cabrillo file
    /// reads the contact's own number and not the first one. N1MM pads it to
    /// three digits.
    private string SentExchangeOn(Qso qso, StationInfo me) =>
        IsUkrainian(me.CountryPrefix) ? me.County : $"{qso.SentNumber:000}";

    public int PointsFor(QsoContext qso)
    {
        if (IsUkrainian(qso.CountryPrefix))
        {
            return IsUkrainian(qso.Me.CountryPrefix) ? 1 : 10;
        }
        if (qso.IsSameCountry)
        {
            return 1;
        }
        return qso.IsSameContinent ? 2 : 3;
    }

    public IReadOnlyList<Multiplier> MultipliersFor(QsoContext qso)
    {
        string band = qso.Band?.Name ?? "";
        List<Multiplier> found = [];
        if (qso.CountryPrefix.Length > 0)
        {
            found.Add(new Multiplier(1, qso.CountryPrefix, band));
        }
        string oblast = qso.Qso.Section.Trim().ToUpperInvariant();
        if (IsUkrainian(qso.CountryPrefix) && oblast.Length > 0)
        {
            found.Add(new Multiplier(2, oblast, band));
        }
        return found;
    }

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

    public CabrilloExchange CabrilloExchange(Qso qso, StationInfo me, ContestEntry entry) =>
        new(
            [
                new CabrilloField(me.Callsign, 13),
                new CabrilloField(qso.SentReport, 3),
                new CabrilloField(SentExchangeOn(qso, me), 6),
            ],
            [
                new CabrilloField(qso.Call.Text, 13),
                new CabrilloField(qso.ReceivedReport, 3),
                new CabrilloField(qso.Section.Length > 0 ? qso.Section : qso.Exchange1, 6),
            ]);

    private static bool IsUkrainian(string countryPrefix) => countryPrefix == "UR";
}