using Nonemm.Contests;
using Nonemm.Core;
using Nonemm.Core.Country;
using Nonemm.Storage;

namespace Nonemm.Session.Tests;

/// A box the walk between the entry boxes steps over cannot be typed in, so it
/// must not be what holds a contact back either. CQ WW RTTY is the contest
/// that skips a box today, and its state box is not required; this is the rule
/// itself, so a contest that asks only some stations for a box cannot lock the
/// operator out of his own log.
public class SkippedFieldTests
{
    private const string Countries = """
        United States:            05:  08:  NA:   37.60:   91.87:    5.0:  K:
            K,W,N,AA;
        Japan:                    25:  45:  AS:   36.40: -138.38:   -9.0:  JA:
            JA,JH,JR;
        Germany:                  14:  28:  EU:   51.00:  -10.00:   -1.0:  DL:
            DL,DK;
        """;

    private static readonly StationInfo Me = new()
    {
        Callsign = "DL1ABC",
        CountryPrefix = "DL",
        Continent = "EU",
        CqZone = 14,
    };

    private static OperatingPosition Position()
    {
        FakeLogStore store = new();
        ContestInstance instance = store.AddContest(new ContestInstance
        {
            ContestNumber = 0,
            ContestName = "STATEONLY",
        });
        return new OperatingPosition(new ContestSession(
            store, new StateFromAmericansOnly(), instance, Me, CountryFile.Parse(Countries)));
    }

    private static OperatingPosition Working(string call)
    {
        OperatingPosition position = Position();
        position.Entry.Call = call;
        position.Entry.Set(ExchangeSlot.ReceivedReport, "599");
        return position;
    }

    [Fact]
    public void ABoxTheWalkStepsOverDoesNotHoldTheContactBack()
    {
        OperatingPosition position = Working("JA1XYZ");

        Assert.True(position.IsEntryComplete);
        Assert.Equal("JA1XYZ", position.LogContact().Call.Text);
    }

    [Fact]
    public void ABoxTheStationIsAskedForStillHoldsTheContactBack()
    {
        OperatingPosition position = Working("K1ABC");

        Assert.False(position.IsEntryComplete);
        Assert.Throws<InvalidOperationException>(() => position.LogContact());

        position.Entry.Set(ExchangeSlot.Section, "CT");

        Assert.True(position.IsEntryComplete);
    }

    /// The cursor and the completeness check read the same rule. The report
    /// boxes are filled in by the program, so with the state box stepped over
    /// there is nothing left to type and the cursor stays on the callsign.
    [Fact]
    public void TheWalkStepsOverTheSameBox()
    {
        OperatingPosition japan = Working("JA1XYZ");
        japan.Entry.FocusOn(0);
        japan.MoveFocus(forward: true);

        Assert.Equal(0, japan.Entry.Focus);

        OperatingPosition america = Working("K1ABC");
        america.Entry.FocusOn(0);
        america.MoveFocus(forward: true);

        Assert.Equal(
            ExchangeSlot.Section,
            america.Entry.Exchange[america.Entry.Focus - 1].Slot);
    }

    /// A contest that asks only American stations for a state, and marks the
    /// box required — which is what the entry window used to lock up on.
    private sealed class StateFromAmericansOnly : Contest
    {
        public string Name => "STATEONLY";

        public string DisplayName => "State from Americans only";

        public string CabrilloName => "STATE-ONLY";

        public IReadOnlyList<ExchangeField> ExchangeFieldsFor(StationInfo me) =>
        [
            new ExchangeField("Snt", ExchangeSlot.SentReport, ExchangeFieldKind.Report, IsRequired: false),
            new ExchangeField("Rcv", ExchangeSlot.ReceivedReport, ExchangeFieldKind.Report),
            new ExchangeField("State", ExchangeSlot.Section, ExchangeFieldKind.Text),
        ];

        public bool SkipsField(ExchangeField field, CountryLookup? their) =>
            field.Slot == ExchangeSlot.Section && their?.Entity.PrimaryPrefix != "K";

        public IReadOnlyList<string> MultiplierNames => ["States"];

        public DupeScope DupeScope => DupeScope.PerBand;

        public bool HasSerialNumbers => false;

        public IReadOnlyList<ModeCategory> Modes => [];

        public string SentExchangeFor(StationInfo me) => me.State;

        public int PointsFor(QsoContext qso) => 1;

        public IReadOnlyList<Multiplier> MultipliersFor(QsoContext qso) => [];

        public int TotalScore(ScoreTally tally, ContestEntry entry) => tally.Points;

        public CabrilloExchange CabrilloExchange(Qso qso, StationInfo me, ContestEntry entry) =>
            new([new CabrilloField(me.Callsign, 13)], [new CabrilloField(qso.Call.Text, 13)]);
    }
}