using Nonemm.Core;

namespace Nonemm.Contests.Rules;

/// The IARU Region 1 Field Day. A portable station is worth 5 points, a station
/// in Region 1 operating from home 2, and one outside Region 1 3. The exchange
/// is a serial number and the countries are multipliers, once per band.
public sealed class FieldDayRegionOne : Contest
{
    public string Name => "FDREG1";

    public string DisplayName => "IARU Region 1 Field Day";

    public string CabrilloName => "FIELDDAY-REGION-1";

    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),
    ];

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

    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)
    {
        if (IsPortable(qso.Qso.Call))
        {
            return 5;
        }
        return IsRegionOne(qso.Continent) ? 2 : 3;
    }

    public IReadOnlyList<Multiplier> MultipliersFor(QsoContext qso) =>
        qso.CountryPrefix.Length == 0
            ? []
            : [new Multiplier(1, qso.CountryPrefix, 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($"{qso.SentNumber:000}", 4),
            ],
            [
                new CabrilloField(qso.Call.Text, 13),
                new CabrilloField(qso.ReceivedReport, 3),
                new CabrilloField($"{qso.ReceivedNumber:000}", 4),
            ]);

    /// A field day station signs portable, mobile or /A.
    private static bool IsPortable(Callsign call) =>
        call.Text.EndsWith("/P", StringComparison.OrdinalIgnoreCase)
        || call.Text.EndsWith("/M", StringComparison.OrdinalIgnoreCase)
        || call.Text.EndsWith("/A", StringComparison.OrdinalIgnoreCase);

    /// Region 1 is Europe, Africa and the Middle East. The country file has a
    /// continent for the first two; the Middle East is inside Asia, which is
    /// split between regions, and the continent alone does not separate them.
    private static bool IsRegionOne(string continent) => continent is "EU" or "AF";
}