using Nonemm.Core;

namespace Nonemm.Contests.Rules;

/// IARU HF World Championship. The exchange is an ITU zone or, for a society
/// headquarters station, its abbreviation; both count as multipliers per band.
///
/// The received zone or abbreviation goes in the section column, which is where
/// N1MM keeps it.
public sealed class IaruHf : Contest
{
    public string Name => "IARU";

    public string DisplayName => "IARU HF World Championship";

    public string CabrilloName => "IARU-HF";

    public IReadOnlyList<ExchangeField> ExchangeFieldsFor(StationInfo me) =>
    [
        new ExchangeField("Snt", ExchangeSlot.SentReport, ExchangeFieldKind.Report, IsRequired: false),
        new ExchangeField("Rcv", ExchangeSlot.ReceivedReport, ExchangeFieldKind.Report),
        new ExchangeField("ITU-Zone", ExchangeSlot.Section, ExchangeFieldKind.Text) { Width = 6 },
    ];

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

    public bool UsesItuZones => true;

    public DupeScope DupeScope => DupeScope.PerBandAndMode;

    public bool HasSerialNumbers => false;

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

    public string SentExchangeFor(StationInfo me) => me.ItuZone.ToString();

    public int PointsFor(QsoContext qso)
    {
        string exchange = Exchange(qso);
        if (!IsZone(exchange))
        {
            return 1;
        }
        if (int.TryParse(exchange, out int zone) && zone == qso.Me.ItuZone)
        {
            return 1;
        }
        return qso.IsSameContinent ? 3 : 5;
    }

    public IReadOnlyList<Multiplier> MultipliersFor(QsoContext qso)
    {
        string exchange = Exchange(qso);
        if (exchange.Length == 0)
        {
            return [];
        }
        string band = qso.Band?.Name ?? "";
        return [new Multiplier(IsZone(exchange) ? 1 : 2, exchange, band)];
    }

    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(me.ItuZone.ToString(), 6),
            ],
            [
                new CabrilloField(qso.Call.Text, 13),
                new CabrilloField(qso.ReceivedReport, 3),
                new CabrilloField(qso.Section, 6),
            ]);

    private static string Exchange(QsoContext qso) => qso.Qso.Section.Trim().ToUpperInvariant();

    private static bool IsZone(string exchange) =>
        exchange.Length > 0 && exchange.All(char.IsAsciiDigit);
}