using Nonemm.Core;

namespace Nonemm.Contests.Rules;

/// The YOTA contest. The exchange is the operator's age, a contact with a
/// young operator is worth more, and every age worked on a band is a
/// multiplier.
///
/// N1MM has no class for this one — it is logged there through a `.udc` file,
/// which is why the contest name is plain `YOTA`.
public sealed class Yota : Contest
{
    public string Name => "YOTA";

    public string DisplayName => "YOTA Contest";

    public string CabrilloName => "YOTA";

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

    public IReadOnlyList<string> MultiplierNamesFor(StationInfo me) => ["Ages"];

    public DupeScope DupeScope => DupeScope.PerBandAndMode;

    public bool HasSerialNumbers => false;

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

    /// The operator's own age, which the contest setup asks for.
    public string SentExchangeFor(StationInfo me) => "";

    /// A contact with an operator of 25 or under is worth 10 to 13 points by
    /// age, whatever the continent. Everyone else is worth 1 point on your own
    /// continent and 3 from another.
    public int PointsFor(QsoContext qso) => Age(qso) switch
    {
        null or > 25 => qso.IsSameContinent ? 1 : 3,
        <= 12 => 13,
        <= 16 => 12,
        <= 21 => 11,
        _ => 10,
    };

    /// Each age worked on a band, whatever the mode.
    public IReadOnlyList<Multiplier> MultipliersFor(QsoContext qso) =>
        Age(qso) is { } age ? [new Multiplier(1, age.ToString(), qso.Band?.Name ?? "")] : [];

    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(entry.SentExchange, 3),
            ],
            [
                new CabrilloField(qso.Call.Text, 13),
                new CabrilloField(qso.ReceivedReport, 3),
                new CabrilloField(qso.Exchange1, 3),
            ]);

    private static int? Age(QsoContext qso) =>
        int.TryParse(qso.Qso.Exchange1.Trim(), out int age) && age > 0 ? age : null;
}