using Nonemm.Core;

namespace Nonemm.Contests.Rules;

/// The JARL All Asian DX contest. It is two contests in one. A station
/// outside Asia works Asia only, and counts the WPX prefix of each Asian
/// station once per band. An Asian station works everybody except its own
/// country, counts countries instead of prefixes, and is paid three times the
/// band value for a contact outside Asia.
public sealed class AllAsian : Contest
{
    private readonly ModeCategory mode;

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

    public string Name => mode == ModeCategory.Cw ? "ALLASIACW" : "ALLASIASSB";

    public string DisplayName => $"All Asian DX {ModeLabel()}";

    public string CabrilloName => mode == ModeCategory.Cw ? "AADX-CW" : "AADX-SSB";

    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) =>
        me.Continent == "AS" ? ["Countries"] : ["Prefixes"];

    public DupeScope DupeScope => DupeScope.PerBand;

    public bool HasSerialNumbers => false;

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

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

    public int PointsFor(QsoContext qso)
    {
        if (!IsWorkable(qso))
        {
            return 0;
        }
        bool treble = qso.Me.Continent == "AS"
            && qso.Continent != "AS"
            && !qso.Qso.Call.IsMaritimeMobile;
        return PointsOn(qso.Band) * (treble ? 3 : 1);
    }

    public IReadOnlyList<Multiplier> MultipliersFor(QsoContext qso)
    {
        if (!IsWorkable(qso) || qso.Qso.Call.IsMaritimeMobile)
        {
            return [];
        }
        string? value = qso.Me.Continent == "AS" ? qso.CountryPrefix : qso.Qso.Call.WpxPrefix();
        return string.IsNullOrEmpty(value)
            ? []
            : [new Multiplier(1, value, 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),
            ]);

    /// An Asian station works anybody outside its own country. Everybody else
    /// works Asia only, and a maritime mobile is not one of them: a station at
    /// sea makes a valid contact with an Asian station alone.
    public bool IsWorkable(QsoContext qso) =>
        qso.Me.Continent == "AS"
            ? !qso.IsSameCountry
            : qso.Continent == "AS" && !qso.Qso.Call.IsMaritimeMobile;

    /// 160 metres is worth 3, 80 and 10 metres 2, and every other band 1. An
    /// Asian entrant works from the same table and trebles it outside Asia,
    /// except for a maritime mobile, which pays the Asian rate wherever it is.
    private static int PointsOn(Band? band) => band?.Name switch
    {
        "160M" => 3,
        "80M" or "10M" => 2,
        null => 0,
        _ => 1,
    };

    private string ModeLabel() => mode == ModeCategory.Cw ? "CW" : "SSB";
}