using Nonemm.Core;

namespace Nonemm.Contests.Rules;

/// RSGB Islands On The Air. A station on an island sends its IOTA reference
/// after the serial number and is worth 15 points; everyone else is worth 2.
/// Each reference counts once per band and mode.
///
/// The operator's own island is not held anywhere, so the contest cannot yet
/// score a contact with a station on the same island, which N1MM counts as 5
/// points.
public sealed class Iota : Contest
{
    public string Name => "IOTA";

    public string DisplayName => "RSGB Islands On The Air";

    public string CabrilloName => "RSGB-IOTA";

    public IReadOnlyList<ExchangeField> ExchangeFieldsFor(StationInfo me) =>
    [
        new ExchangeField("Snt", ExchangeSlot.SentReport, ExchangeFieldKind.Report, IsRequired: false),
        new ExchangeField("SentNr", ExchangeSlot.SentNumber, ExchangeFieldKind.Number, IsRequired: false),
        new ExchangeField("Rcv", ExchangeSlot.ReceivedReport, ExchangeFieldKind.Report),
        new ExchangeField("Nr", ExchangeSlot.SerialNumber, ExchangeFieldKind.Number),
        new ExchangeField("IOTA", ExchangeSlot.Section, ExchangeFieldKind.Text, IsRequired: false)
        {
            Width = 6,
        },
    ];

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

    public DupeScope DupeScope => DupeScope.PerBandAndMode;

    public bool HasSerialNumbers => true;

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

    public string SentExchangeFor(StationInfo me) => "001";

    public int PointsFor(QsoContext qso) => Reference(qso.Qso).Length > 0 ? 15 : 2;

    public IReadOnlyList<Multiplier> MultipliersFor(QsoContext qso)
    {
        string reference = Reference(qso.Qso);
        return reference.Length == 0
            ? []
            : [new Multiplier(1, reference, $"{qso.Band?.Name}|{qso.ModeCategory}")];
    }

    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($"{qso.SentNumber:000}", 4),
                new CabrilloField(entry.SentExchange, 6),
            ],
            [
                new CabrilloField(qso.Call.Text, 13),
                new CabrilloField(qso.ReceivedReport, 3),
                new CabrilloField($"{qso.ReceivedNumber:000}", 4),
                new CabrilloField(Reference(qso), 6),
            ]);

    private static string Reference(Qso qso) => qso.Section.Trim().ToUpperInvariant();
}