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

namespace Nonemm.Session.Tests;

public class OperatingPositionTests
{
    private const string Countries = """
        Germany:                  14:  28:  EU:   51.00:  -10.00:   -1.0:  DL:
            DL,DK,DJ;
        Japan:                    25:  45:  AS:   36.40: -138.38:   -9.0:  JA:
            JA,JH,JR;
        """;

    private static readonly StationInfo Me = new()
    {
        Callsign = "DL1ABC",
        CqZone = 14,
        ItuZone = 28,
        Continent = "EU",
        CountryPrefix = "DL",
    };

    /// N1MM's `{FORCELOG}`: a contact the checks refuse still goes in the log,
    /// because one that was never logged cannot be fixed afterwards.
    [Fact]
    public void AForcedContactIsLoggedWithTheExchangeShort()
    {
        OperatingPosition session = Session();
        session.Entry.Call = "JA1XYZ";

        Assert.False(session.IsEntryComplete);
        Assert.Equal("JA1XYZ", session.LogContactAnyway().Call.Text);
        Assert.Single(session.Log.Qsos);
    }

    [Fact]
    public void AForcedContactStillNeedsACallsign()
    {
        OperatingPosition session = Session();

        Assert.Throws<InvalidOperationException>(() => session.LogContactAnyway());
    }

    private static OperatingPosition Session(Contest? contest = null) =>
        new(Shared(new FakeLogStore(), contest));

    private static ContestSession Shared(FakeLogStore store, Contest? contest = null)
    {
        ContestInstance instance = store.AddContest(new ContestInstance
        {
            ContestNumber = 0,
            ContestName = "CQWW",
        });
        return new ContestSession(
            store,
            contest ?? new CqWorldWide(ModeCategory.Cw),
            instance,
            Me,
            CountryFile.Parse(Countries));
    }

    private static void Type(OperatingPosition session, string call, string zone)
    {
        session.Entry.Call = call;
        session.Entry.Set(ExchangeSlot.ReceivedReport, "599");
        session.Entry.Set(ExchangeSlot.Zone, zone);
    }

    /// N1MM shows what this station sends beside what it copies, keeps both
    /// filled in and steps over them.
    [Fact]
    public void TheSentBoxesAreFilledInAndSteppedOver()
    {
        OperatingPosition session = Session(new CqWpx(ModeCategory.Cw));

        Assert.Equal("599", session.Entry.ValueOf(ExchangeSlot.SentReport));
        Assert.Equal("1", session.Entry.ValueOf(ExchangeSlot.SentNumber));

        // the boxes are the call, the two reports, the sent serial and the
        // serial being copied
        session.Entry.Advance();
        Assert.Equal(4, session.Entry.Focus);
    }

    [Fact]
    public void TheSentSerialGoesUpWhenAContactIsLogged()
    {
        OperatingPosition session = Session(new CqWpx(ModeCategory.Cw));
        session.Entry.Call = "JA1XYZ";
        session.Entry.Set(ExchangeSlot.ReceivedReport, "599");
        session.Entry.Set(ExchangeSlot.SerialNumber, "12");

        Assert.Equal(1, session.LogContact().SentNumber);
        Assert.Equal("2", session.Entry.ValueOf(ExchangeSlot.SentNumber));
    }

    /// The BARTG contest sends the time of the exchange, and logs the time it
    /// sent rather than the time the contact was logged.
    [Fact]
    public void TheTimeTheExchangeWentOutIsLoggedForBartg()
    {
        OperatingPosition session = Session(new BartgSprint());
        session.Entry.Call = "JA1XYZ";
        session.Entry.Set(ExchangeSlot.ReceivedReport, "599");
        session.Entry.Set(ExchangeSlot.SerialNumber, "12");
        session.Entry.Set(ExchangeSlot.Exchange1, "1646");
        session.StampSentTime();
        string stamped = session.SentTime;

        Qso logged = session.LogContact();

        Assert.Equal(4, stamped.Length);
        Assert.Equal(stamped, logged.MiscText);
        Assert.Equal("", session.SentTime);
    }

    /// A contest that does not exchange a time keeps the column empty.
    [Fact]
    public void NothingIsStampedForAContestThatSendsNoTime()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        session.StampSentTime();

        Assert.Equal("", session.SentTime);
        Assert.Equal("", session.LogContact().MiscText);
    }

    [Fact]
    public void LoggingAContactPutsItInTheLogAndClearsTheEntry()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        Qso logged = session.LogContact();

        Assert.Equal("JA1XYZ", logged.Call.Text);
        Assert.Equal(25, logged.Zone);
        Assert.Equal(3, logged.Points);
        Assert.Equal("", session.Entry.Call);
        Assert.Single(session.Log.Qsos);
    }

    [Fact]
    public void CountryAndPrefixAreFilledInFromTheCountryFile()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        Qso logged = session.LogContact();

        Assert.Equal("JA", logged.CountryPrefix);
        Assert.Equal("AS", logged.Continent);
        Assert.Equal("JA1", logged.WpxPrefix);
    }

    [Fact]
    public void AnIncompleteExchangeIsNotLogged()
    {
        OperatingPosition session = Session();
        session.Entry.Call = "JA1XYZ";
        Assert.Throws<InvalidOperationException>(() => session.LogContact());
    }

    [Fact]
    public void TheSameStationOnTheSameBandReadsAsADupe()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        session.LogContact();
        Type(session, "JA1XYZ", "25");
        Assert.True(session.Verdict()?.IsDupe);
    }

    [Fact]
    public void MovingBandClearsTheDupe()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        session.LogContact();
        session.Tune(Frequency.FromKilohertz(7_025));
        Type(session, "JA1XYZ", "25");
        Assert.False(session.Verdict()?.IsDupe);
    }

    [Fact]
    public void SerialNumbersCountUp()
    {
        OperatingPosition session = Session(new CqWpx(ModeCategory.Cw));
        Assert.Equal(1, session.SentNumber);
        session.Entry.Call = "JA1XYZ";
        session.Entry.Set(ExchangeSlot.ReceivedReport, "599");
        session.Entry.Set(ExchangeSlot.SerialNumber, "12");
        session.LogContact();
        Assert.Equal(2, session.SentNumber);
    }

    [Fact]
    public void SpaceStepsOverTheReportAndComesBackToTheCall()
    {
        // CQ WW's boxes are the call, the two reports and the zone
        OperatingPosition session = Session();

        Assert.Equal(0, session.Entry.Focus);
        session.Entry.Advance();
        Assert.Equal(3, session.Entry.Focus);
        session.Entry.Advance();
        Assert.Equal(0, session.Entry.Focus);
    }

    [Fact]
    public void GoingBackStepsOverTheReportToo()
    {
        OperatingPosition session = Session();
        session.Entry.FocusOn(3);

        session.Entry.Retreat();

        Assert.Equal(0, session.Entry.Focus);
    }

    [Fact]
    public void TheReportBoxesAreFilledInWithWhatWouldBeSentAnyway()
    {
        OperatingPosition session = Session();

        Assert.True(session.FillReports());

        Assert.Equal("599", session.Entry.ValueOf(ExchangeSlot.ReceivedReport));
        Assert.False(session.FillReports());
    }

    [Fact]
    public void AReportTheOperatorTypedIsLeftAlone()
    {
        OperatingPosition session = Session();
        session.Entry.Set(ExchangeSlot.ReceivedReport, "559");

        Assert.False(session.FillReports());
        Assert.Equal("559", session.Entry.ValueOf(ExchangeSlot.ReceivedReport));
    }

    [Theory]
    [InlineData("14025", 14_025_000)]
    [InlineData("14.025", 14_025_000)]
    [InlineData("7025.5", 7_025_500)]
    public void AFrequencyTypedIntoTheCallBoxIsRecognised(string typed, long hertz)
    {
        OperatingPosition session = Session();
        session.Entry.Call = typed;
        Assert.Equal(hertz, session.PendingQsy()?.Hertz);
    }

    [Theory]
    [InlineData("JA1XYZ")]
    [InlineData("12000")]
    public void ACallOrAnOutOfBandNumberIsNotAQsy(string typed)
    {
        OperatingPosition session = Session();
        session.Entry.Call = typed;
        Assert.Null(session.PendingQsy());
    }

    [Fact]
    public void AContactDeletedFromTheLogGivesItsMultiplierBack()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        Qso first = session.LogContact();
        Type(session, "JA2XYZ", "25");
        session.LogContact();
        Assert.Equal(2, session.Log.Tally.TotalMultipliers);

        session.Session.Delete(first.Id);
        Assert.Single(session.Log.Qsos);
        Assert.Equal(2, session.Log.Tally.TotalMultipliers);
        Assert.True(session.Log.Qsos.Single().IsMultiplier1);
    }

    [Fact]
    public void AContactWorkedSplitRecordsWhereWeTransmitted()
    {
        OperatingPosition session = Session();
        session.Tune(
            Frequency.FromKilohertz(14_025),
            Modes.Cw,
            Frequency.FromKilohertz(14_200));
        Type(session, "JA1XYZ", "25");

        Qso logged = session.LogContact();

        Assert.Equal(14_025_000, logged.Frequency.Hertz);
        Assert.Equal(14_200_000, logged.QsxFrequency.Hertz);
    }

    [Fact]
    public void AContactRecordsWhichRadioMadeIt()
    {
        OperatingPosition session = new(Shared(new FakeLogStore()), 2);
        Type(session, "JA1XYZ", "25");

        Assert.Equal(2, session.LogContact().RadioNumber);
    }

    /// Tuning without saying anything about split leaves it where it was, so a
    /// frequency typed by hand does not clear what the radio reported.
    [Fact]
    public void TuningWithoutASplitLeavesTheOneAlreadySet()
    {
        OperatingPosition session = Session();
        session.Tune(Frequency.FromKilohertz(14_025), null, Frequency.FromKilohertz(14_200));

        session.Tune(Frequency.FromKilohertz(14_030));

        Assert.Equal(14_200_000, session.TransmitFrequency.Hertz);
    }

    [Fact]
    public void EditingAContactRescoresTheLog()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        Qso logged = session.LogContact();
        Assert.Equal(3, session.Log.Tally.Points);

        QsoEdit edit = session.Session.Edit(logged.Id, QsoField.Call, "DL2XYZ");

        Assert.True(edit.IsAccepted);
        Assert.Equal("DL2XYZ", session.Log.Qsos.Single().Call.Text);
        Assert.Equal(0, session.Log.Tally.Points);
    }

    [Fact]
    public void ARefusedEditLeavesTheLogAlone()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        Qso logged = session.LogContact();

        QsoEdit edit = session.Session.Edit(logged.Id, QsoField.Zone, "41");

        Assert.False(edit.IsAccepted);
        Assert.Equal(25, session.Log.Qsos.Single().Zone);
    }

    /// The other stations need the call and time the contact had before, because
    /// that is how they find their own copy of it.
    [Fact]
    public void AnEditReportsWhatTheContactUsedToBe()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        Qso logged = session.LogContact();
        QsoChange? change = null;
        session.Session.Edited += (_, c) => change = c;

        session.Session.Edit(logged.Id, QsoField.Call, "JA2XYZ");

        Assert.Equal("JA1XYZ", change?.OldCall);
        Assert.Equal(logged.TimestampUtc, change?.OldTimestampUtc);
        Assert.Equal("JA2XYZ", change?.Qso.Call.Text);
    }

    /// The country file gets a call wrong now and then. Correcting the country
    /// by hand has to change the score, or the correction is decoration.
    [Fact]
    public void CorrectingTheCountryChangesTheScore()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        Qso logged = session.LogContact();
        Assert.Equal(3, session.Log.Tally.Points);

        session.Session.Edit(logged.Id, QsoField.CountryPrefix, "DL");

        Assert.Equal(0, session.Log.Tally.Points);
    }

    [Fact]
    public void ADeleteReportsTheContactThatWent()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        Qso logged = session.LogContact();
        Qso? gone = null;
        session.Session.Deleted += (_, q) => gone = q;

        session.Session.Delete(logged.Id);

        Assert.Equal("JA1XYZ", gone?.Call.Text);
    }

    [Fact]
    public void StoredContactsAreReadBackWhenTheSessionStarts()
    {
        FakeLogStore store = new();
        OperatingPosition first = new(Shared(store));
        Type(first, "JA1XYZ", "25");
        first.LogContact();

        OperatingPosition second = new(new ContestSession(
            store,
            new CqWorldWide(ModeCategory.Cw),
            first.Instance,
            Me,
            CountryFile.Parse(Countries)));
        Assert.Single(second.Log.Qsos);
        Assert.Equal(3, second.Log.Tally.Points);
    }

    private static OperatingPosition WithHistory(Contest contest, string file)
    {
        FakeLogStore store = new();
        ContestInstance instance = store.AddContest(new ContestInstance
        {
            ContestNumber = 0,
            ContestName = contest.Name,
        });
        return new OperatingPosition(new ContestSession(
            store,
            contest,
            instance,
            Me,
            CountryFile.Parse(Countries),
            CallHistory.Parse(file)));
    }

    [Fact]
    public void TheCallHistoryFillsTheExchangeIn()
    {
        OperatingPosition session = WithHistory(
            new Sweepstakes(ModeCategory.Cw),
            "!!Order!!,Call,Sect,CK\nW3LPL,MDC,56");
        session.Entry.Call = "W3LPL";

        Assert.True(session.FillFromHistory());
        Assert.Equal("56MDC", session.Entry.ValueOf(ExchangeSlot.Exchange1));
    }

    /// What the other station actually sends beats what was published, so a box
    /// with something in it is left alone.
    [Fact]
    public void WhatIsAlreadyTypedIsNotOverwritten()
    {
        OperatingPosition session = WithHistory(
            new Sweepstakes(ModeCategory.Cw),
            "!!Order!!,Call,Sect\nW3LPL,MDC");
        session.Entry.Call = "W3LPL";
        session.Entry.Set(ExchangeSlot.Exchange1, "72A 74EPA");

        session.FillFromHistory();

        Assert.Equal("72A 74EPA", session.Entry.ValueOf(ExchangeSlot.Exchange1));
    }

    [Fact]
    public void ACallTheHistoryDoesNotHoldFillsNothing()
    {
        OperatingPosition session = WithHistory(
            new Sweepstakes(ModeCategory.Cw),
            "!!Order!!,Call,Sect\nW3LPL,MDC");
        session.Entry.Call = "JA1XYZ";

        Assert.False(session.FillFromHistory());
        Assert.Equal("", session.Entry.ValueOf(ExchangeSlot.Exchange1));
    }

    /// CQ WW exchanges the CQ zone, so the CQ zone column is the one to use.
    [Fact]
    public void TheZoneComesFromTheColumnTheContestAsksFor()
    {
        OperatingPosition session = WithHistory(
            new CqWorldWide(ModeCategory.Cw),
            "!!Order!!,Call,CqZone,ITUZone\nJA1XYZ,25,45");
        session.Entry.Call = "JA1XYZ";

        session.FillFromHistory();

        Assert.Equal("25", session.Entry.ValueOf(ExchangeSlot.Zone));
    }

    /// A file for a section contest often carries the state instead.
    [Fact]
    public void TheStateFillsASectionWhenTheFileHasNoSection()
    {
        OperatingPosition session = WithHistory(
            new Sweepstakes(ModeCategory.Cw),
            "!!Order!!,Call,Sect,State\nK1TTT,,CT");
        session.Entry.Call = "K1TTT";

        session.FillFromHistory();

        Assert.Equal("00CT", session.Entry.ValueOf(ExchangeSlot.Exchange1));
    }

    [Fact]
    public void TheNameAndCommentBoxesReachTheLog()
    {
        OperatingPosition session = Session();
        session.Entry.Call = "JA1XYZ";
        session.Entry.Set(ExchangeSlot.ReceivedReport, "599");
        session.Entry.Set(ExchangeSlot.Zone, "25");
        session.OtherName = "Ken";
        session.Comment = "up 2";

        Qso logged = session.LogContact();

        Assert.Equal("Ken", logged.Name);
        Assert.Equal("up 2", logged.Comment);
        Assert.Equal("", session.OtherName);
        Assert.Equal("", session.Comment);
    }

    [Fact]
    public void WipingClearsTheNameAndTheComment()
    {
        OperatingPosition session = Session();
        session.OtherName = "Ken";
        session.Comment = "up 2";

        session.Wipe();

        Assert.Equal("", session.OtherName);
        Assert.Equal("", session.Comment);
    }

    [Fact]
    public void CqWwRttyStepsOverTheStateBoxForAStationOutsideTheUsAndCanada()
    {
        OperatingPosition session = Session(new CqWorldWide(ModeCategory.Digital));
        session.Entry.Call = "JA1XYZ";

        // the boxes are the call, the two reports, the zone and the state
        session.MoveFocus(forward: true);
        Assert.Equal(3, session.Entry.Focus);
        session.MoveFocus(forward: true);
        Assert.Equal(0, session.Entry.Focus);
    }

    [Fact]
    public void CqWwRttyStopsOnTheStateBoxForAUsStation()
    {
        OperatingPosition session = Session(new CqWorldWide(ModeCategory.Digital));
        session.Entry.Call = "K1ABC";

        session.MoveFocus(forward: true);
        Assert.Equal(3, session.Entry.Focus);
        session.MoveFocus(forward: true);
        Assert.Equal(4, session.Entry.Focus);
    }

    [Fact]
    public void QuickEditLoadsTheLastContactAndSavesTheChangeBack()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        Qso logged = session.LogContact();
        Type(session, "DL9ZZZ", "14");

        Assert.True(session.QuickEdit(forward: false));
        Assert.Equal(logged.Id, session.Editing?.Id);
        Assert.Equal("JA1XYZ", session.Entry.Call);
        Assert.Equal("25", session.Entry.ValueOf(ExchangeSlot.Zone));

        session.Entry.Set(ExchangeSlot.Zone, "24");
        Qso? saved = session.SaveQuickEdit();

        Assert.Equal(24, saved?.Zone);
        Assert.Equal(24, session.Log.Qsos[0].Zone);
        Assert.Null(session.Editing);
    }

    [Fact]
    public void LeavingQuickEditPutsBackWhatWasBeingTyped()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        session.LogContact();
        Type(session, "DL9ZZZ", "14");

        session.QuickEdit(forward: false);
        session.LeaveQuickEdit();

        Assert.Null(session.Editing);
        Assert.Equal("DL9ZZZ", session.Entry.Call);
        Assert.Equal("14", session.Entry.ValueOf(ExchangeSlot.Zone));
    }

    [Fact]
    public void QuickEditForwardPastTheNewestContactLeavesQuickEdit()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        session.LogContact();
        Type(session, "DL9ZZZ", "14");

        session.QuickEdit(forward: false);
        Assert.True(session.QuickEdit(forward: true));

        Assert.Null(session.Editing);
        Assert.Equal("DL9ZZZ", session.Entry.Call);
    }

    [Fact]
    public void QuickEditStepsBackThroughTheLog()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        session.LogContact();
        Type(session, "DL9ZZZ", "14");
        session.LogContact();

        session.QuickEdit(forward: false);
        Assert.Equal("DL9ZZZ", session.Entry.Call);
        session.QuickEdit(forward: false);
        Assert.Equal("JA1XYZ", session.Entry.Call);
        Assert.False(session.QuickEdit(forward: false));
    }

    /// The entry boxes and the log window take the same values. A zone that
    /// does not exist is refused in both, and the box holding it is named so
    /// the entry window can put the cursor back in it.
    [Fact]
    public void AZoneThatDoesNotExistCannotBeLogged()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "41");

        EntryProblem? problem = session.EntryProblem();

        Assert.Equal("CQ zones run from 1 to 40", problem!.Message);
        Assert.Equal("41", session.Entry[problem.Field]);
        Assert.Throws<InvalidOperationException>(session.LogContact);
    }

    [Fact]
    public void ArbitraryTextInTheReportBoxCannotBeLogged()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        session.Entry.Set(ExchangeSlot.ReceivedReport, "good copy");

        Assert.Contains("signal report", session.EntryProblem()!.Message);
    }

    [Fact]
    public void ACallThatIsNotShapedLikeOneCannotBeLogged()
    {
        OperatingPosition session = Session();
        Type(session, "12345", "25");

        Assert.Equal(0, session.EntryProblem()!.Field);
    }

    [Fact]
    public void AnExchangeTheContestTakesGivesNoProblem()
    {
        OperatingPosition session = Session();
        Type(session, "ja1xyz", "25");

        Assert.Null(session.EntryProblem());
    }

    /// Nothing is typed yet when the operator is between contacts, and that is
    /// not something to complain about.
    [Fact]
    public void EmptyBoxesGiveNoProblem() =>
        Assert.Null(Session().EntryProblem());

    /// N1MM's Alt+W goes both ways: it wipes the boxes, and pressed again on
    /// empty boxes it puts back what it wiped.
    [Fact]
    public void AltWWipesAndThenPutsTheBoxesBack()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");

        session.WipeOrRestore();
        Assert.Equal("", session.Entry.Call);

        session.WipeOrRestore();
        Assert.Equal("JA1XYZ", session.Entry.Call);
        Assert.Equal("25", session.Entry.ValueOf(ExchangeSlot.Zone));
    }

    /// A wipe keeps what was in the boxes and Alt+W puts it back.
    [Fact]
    public void WhatAWipeClearedComesBack()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        session.Comment = "loud";

        session.Wipe();
        Assert.Equal("", session.Entry.Call);

        Assert.True(session.RestoreWiped());
        Assert.Equal("JA1XYZ", session.Entry.Call);
        Assert.Equal("25", session.Entry.ValueOf(ExchangeSlot.Zone));
        Assert.Equal("loud", session.Comment);
    }

    [Fact]
    public void ThereIsNothingToPutBackBeforeAWipe() =>
        Assert.False(Session().RestoreWiped());

    /// Wiping empty boxes would otherwise throw away what the wipe before it
    /// kept.
    [Fact]
    public void ASecondWipeKeepsTheFirstOne()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");

        session.Wipe();
        session.Wipe();

        Assert.True(session.RestoreWiped());
        Assert.Equal("JA1XYZ", session.Entry.Call);
    }

    /// N1MM puts the boxes back only when they are empty, so typing is never
    /// overwritten by a restore.
    [Fact]
    public void NothingIsPutBackOverSomethingTyped()
    {
        OperatingPosition session = Session();
        Type(session, "JA1XYZ", "25");
        session.Wipe();
        session.Entry.Call = "DL2XYZ";

        Assert.False(session.RestoreWiped());
        Assert.Equal("DL2XYZ", session.Entry.Call);
    }

    /// A call put on the stack has not gone anywhere, so there is nothing to
    /// put back and Alt+W would only make a second copy of it.
    [Fact]
    public void AStackedCallIsNotWaitingToBePutBack()
    {
        OperatingPosition session = Session();
        session.IsRunning = true;
        Type(session, "JA1XYZ", "25");

        Assert.True(session.StackAnother());
        Assert.False(session.RestoreWiped());
    }

    /// N1MM takes the serial number at the first character of the callsign, not
    /// at logging, so the number is on the network while the contact is still
    /// being worked. A second position takes the next one.
    [Fact]
    public void TypingACallTakesTheSerialNumber()
    {
        ContestSession shared = Shared(new FakeLogStore(), new CqWpx(ModeCategory.Cw));
        OperatingPosition run = new(shared, 1);
        OperatingPosition mult = new(shared, 2);

        run.Entry.Call = "J";

        Assert.Equal(1, run.SentNumber);
        Assert.Equal(2, mult.SentNumber);
    }

    /// Without the pool both positions showed the same number until one of them
    /// logged. The number the other station takes counts here as well.
    [Fact]
    public void ANumberAnotherStationTookIsNotSentHere()
    {
        OperatingPosition session = Session(new CqWpx(ModeCategory.Cw));

        session.Session.Numbers.Note(5, Bands.Band20M);

        Assert.Equal(6, session.SentNumber);
    }

    /// The number is held until the contact is logged, so a wipe keeps it and
    /// the next contact takes a fresh one.
    [Fact]
    public void TheNumberIsHeldUntilTheContactIsLogged()
    {
        OperatingPosition session = Session(new CqWpx(ModeCategory.Cw));
        session.Entry.Call = "JA1XYZ";
        Assert.Equal(1, session.SentNumber);

        session.Wipe();
        Assert.Equal(1, session.SentNumber);

        session.Entry.Call = "JA2XYZ";
        session.Entry.Set(ExchangeSlot.ReceivedReport, "599");
        session.Entry.Set(ExchangeSlot.SerialNumber, "12");
        Assert.Equal(1, session.LogContact().SentNumber);

        session.Entry.Call = "JA3XYZ";
        Assert.Equal(2, session.SentNumber);
    }

    /// A contest without serial numbers has nothing to take.
    [Fact]
    public void NothingIsTakenInAContestThatSendsNoNumbers()
    {
        OperatingPosition session = Session();

        session.Entry.Call = "JA1XYZ";

        Assert.Equal(1, session.Session.Numbers.Next(Bands.Band20M));
    }
}