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

namespace Nonemm.Session.Tests;

/// What a contact from another station of a multi-operator entry does to this
/// log.
public class NetworkedContactsTests
{
    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",
    };

    private static readonly DateTime Start = new(2026, 1, 1, 12, 0, 0, DateTimeKind.Utc);

    private static (ContestSession Session, FakeLogStore Store) Station()
    {
        FakeLogStore store = new();
        ContestInstance instance = store.AddContest(new ContestInstance
        {
            ContestNumber = 0,
            ContestName = "CQWW",
        });
        return (
            new ContestSession(
                store,
                new CqWorldWide(ModeCategory.Cw),
                instance,
                Me,
                CountryFile.Parse(Countries)),
            store);
    }

    private static Qso Arriving(string call, int minute, int zone = 25) => new()
    {
        Id = $"{call}-{minute}",
        TimestampUtc = Start.AddMinutes(minute),
        Call = Callsign.Parse(call),
        Frequency = Frequency.FromKilohertz(14_030),
        Mode = Modes.Cw,
        ContestName = "CQWW",
        SentReport = "599",
        ReceivedReport = "599",
        Zone = zone,
        // what the sending station worked out, which is not trusted
        Points = 99,
        IsMultiplier1 = true,
    };

    /// A contact worked at this station, which `Add` scores from the rules like
    /// any other.
    private static Qso WorkHere(ContestSession session, string call, int minute, int zone = 25) =>
        session.Add(Arriving(call, minute, zone) with
        {
            Id = Qso.NewId(),
            ContestNumber = session.Instance.ContestNumber,
        });

    [Fact]
    public void AContactFromAnotherStationIsLoggedAndScoredHere()
    {
        (ContestSession session, _) = Station();

        Assert.True(session.AddFromNetwork(Arriving("JA1XYZ", 1)));

        Qso stored = Assert.Single(session.Log.Qsos);
        Assert.Equal("JA1XYZ", stored.Call.Text);
        Assert.Equal(3, stored.Points);
        Assert.False(stored.IsOriginal);
        Assert.Equal(session.Instance.ContestNumber, stored.ContestNumber);
    }

    [Fact]
    public void ItDoesNotGoBackOutToTheOtherStations()
    {
        (ContestSession session, _) = Station();
        int sent = 0;
        session.Logged += (_, _) => sent++;

        session.AddFromNetwork(Arriving("JA1XYZ", 1));

        Assert.Equal(0, sent);
    }

    [Fact]
    public void TheSameContactArrivingTwiceIsTakenOnce()
    {
        (ContestSession session, _) = Station();
        session.AddFromNetwork(Arriving("JA1XYZ", 1));

        Assert.False(session.AddFromNetwork(Arriving("JA1XYZ", 1)));
        Assert.Single(session.Log.Qsos);
    }

    /// The station that worked it first keeps the multiplier, however late the
    /// message about it turns up.
    [Fact]
    public void AContactThatArrivesLateStillTakesTheMultiplierItWorkedFirst()
    {
        (ContestSession session, _) = Station();
        WorkHere(session, "JA9ZZZ", minute: 5);

        session.AddFromNetwork(Arriving("JA1XYZ", minute: 1));

        Assert.True(session.Log.Qsos[0].IsMultiplier1);
        Assert.False(session.Log.Qsos[1].IsMultiplier1);
        Assert.Equal("JA1XYZ", session.Log.Qsos[0].Call.Text);
    }

    [Fact]
    public void WhatIsBeingTypedIsLeftAlone()
    {
        (ContestSession session, _) = Station();
        OperatingPosition position = new(session);
        position.Entry.Call = "G4AB";
        position.Entry.Set(ExchangeSlot.Zone, "14");

        session.AddFromNetwork(Arriving("JA1XYZ", 1));

        Assert.Equal("G4AB", position.Entry.Call);
        Assert.Equal("14", position.Entry.ValueOf(ExchangeSlot.Zone));
    }

    /// The stored points and multiplier flags go stale when a contact from
    /// another station arrives after the one that took the multiplier. The
    /// rescore is what writes them back, because N1MM reads those columns
    /// rather than working them out.
    [Fact]
    public void ARescoreWritesTheScoringBackToTheStore()
    {
        (ContestSession session, FakeLogStore store) = Station();
        Qso mine = WorkHere(session, "JA9ZZZ", minute: 5);
        session.AddFromNetwork(Arriving("JA1XYZ", minute: 1));
        Assert.True(store.Qsos(session.Instance.ContestNumber).Single(q => q.Id == mine.Id).IsMultiplier1);

        Assert.Equal(2, session.Rescore(DateTime.MinValue));

        Qso stored = store.Qsos(session.Instance.ContestNumber).Single(q => q.Id == mine.Id);
        Assert.False(stored.IsMultiplier1);
        Assert.Equal(session.Log.Qsos.Single(q => q.Id == mine.Id).Points, stored.Points);
    }

    /// A rescore of the last hour leaves the rows before it alone.
    [Fact]
    public void ARescoreOnlyWritesTheContactsInsideThePeriod()
    {
        (ContestSession session, _) = Station();
        WorkHere(session, "JA9ZZZ", minute: 5);
        WorkHere(session, "JA8YYY", minute: 90);

        Assert.Equal(1, session.Rescore(Start.AddMinutes(60)));
    }

    /// A resync sends its contacts in a burst, and they are scored together.
    [Fact]
    public void ABurstOfContactsIsLoggedOnceAndRaisesOneChange()
    {
        (ContestSession session, FakeLogStore store) = Station();
        int changes = 0;
        session.Changed += (_, _) => changes++;

        int added = session.AddRangeFromNetwork(
            [Arriving("JA1XYZ", 1), Arriving("JA2XYZ", 2), Arriving("JA1XYZ", 1)]);

        Assert.Equal(2, added);
        Assert.Equal(1, changes);
        Assert.Equal(2, store.Qsos(session.Instance.ContestNumber).Count);
        Assert.Equal(2, session.Log.Qsos.Count);
    }

    /// A resync drops the block it is about to be sent again, so the contacts
    /// are replaced rather than added to.
    [Fact]
    public void ABlockOfOneStationsContactsCanBeCleared()
    {
        (ContestSession session, FakeLogStore store) = Station();
        session.AddFromNetwork(Arriving("JA1XYZ", minute: 1) with { StationName = "RUN-PC" });
        session.AddFromNetwork(Arriving("JA2XYZ", minute: 90) with { StationName = "RUN-PC" });
        session.AddFromNetwork(Arriving("JA3XYZ", minute: 2) with { StationName = "MULT-PC" });

        Assert.Equal(1, session.ClearFromNetwork("run-pc", Start, TimeSpan.FromHours(1)));

        Assert.Equal(["JA2XYZ", "JA3XYZ"], session.Log.Qsos.Select(q => q.Call.Text).Order());
        Assert.Equal(2, store.Qsos(session.Instance.ContestNumber).Count);
    }

    /// Reset Serial Numbers at all Stations puts the next number back to the
    /// highest in the log plus one, which is what the N1MM manual says it does:
    /// every station lands on the same number without repeating one that has
    /// gone out. The contacts already logged keep the numbers they were sent
    /// with.
    [Fact]
    public void ResettingTheSerialNumbersCountsFromTheLogAgain()
    {
        (ContestSession session, _) = Station();
        session.Add(Arriving("JA1XYZ", 1) with { Id = Qso.NewId(), SentNumber = 1 });
        session.Add(Arriving("JA2XYZ", 2) with { Id = Qso.NewId(), SentNumber = 2 });
        // a number claimed by a station that was logging something else, which
        // is the mess the reset is for
        session.Numbers.Note(400, Bands.Band20M);
        Assert.Equal(401, session.NextNumberOn(null));

        session.RestartNumbers();

        Assert.Equal(3, session.NextNumberOn(null));
        Assert.Equal([1, 2], session.Log.Qsos.Select(q => q.SentNumber));
    }

    /// Every contact logged here carries the computer that made it, which is
    /// what a resync asks for and what N1MM stamps into `NetBiosName`.
    [Fact]
    public void AContactLoggedHereCarriesThisComputersName()
    {
        (ContestSession session, _) = Station();
        session.StationName = "RUN-PC";
        session.StationNumber = 3;

        Qso stored = WorkHere(session, "JA1XYZ", minute: 1);

        Assert.Equal("RUN-PC", stored.StationName);
        Assert.Equal(3, stored.NetworkedComputerNumber);
    }

    [Fact]
    public void AnEditFromAnotherStationIsAppliedById()
    {
        (ContestSession session, _) = Station();
        session.AddFromNetwork(Arriving("JA1XYZ", 1));

        Assert.True(session.ReplaceFromNetwork(
            Arriving("JA1XYZ", 1) with { Zone = 24 },
            "JA1XYZ",
            Start.AddMinutes(1)));

        Assert.Equal(24, Assert.Single(session.Log.Qsos).Zone);
    }

    /// N1MM does not know our ids, so a message from N1MM is matched on the
    /// call and time the contact had before the edit.
    [Fact]
    public void AnEditWithNoIdIsMatchedOnTheOldCallAndTime()
    {
        (ContestSession session, _) = Station();
        Qso worked = WorkHere(session, "JA1XYZ", minute: 1);

        Assert.True(session.ReplaceFromNetwork(
            Arriving("JA1XYY", 1) with { Id = "" },
            "JA1XYZ",
            worked.TimestampUtc));

        Qso changed = Assert.Single(session.Log.Qsos);
        Assert.Equal("JA1XYY", changed.Call.Text);
        Assert.Equal(worked.Id, changed.Id);
    }

    [Fact]
    public void AnEditToAContactWeDoNotHoldIsRefused()
    {
        (ContestSession session, _) = Station();

        Assert.False(session.ReplaceFromNetwork(Arriving("JA1XYZ", 1), "JA1XYZ", Start));
        Assert.Empty(session.Log.Qsos);
    }

    [Fact]
    public void ADeleteFromAnotherStationRemovesTheContactAndRescores()
    {
        (ContestSession session, FakeLogStore store) = Station();
        session.AddFromNetwork(Arriving("JA1XYZ", 1));
        WorkHere(session, "JA9ZZZ", minute: 5);

        Assert.True(session.DeleteFromNetwork("JA1XYZ-1", "JA1XYZ", Start.AddMinutes(1)));

        Qso left = Assert.Single(session.Log.Qsos);
        Assert.Equal("JA9ZZZ", left.Call.Text);
        Assert.True(left.IsMultiplier1);
        Assert.Single(store.Qsos(session.Instance.ContestNumber));
    }

    [Fact]
    public void ADeleteOfAContactWeDoNotHoldIsRefused()
    {
        (ContestSession session, _) = Station();

        Assert.False(session.DeleteFromNetwork("nothing", "JA1XYZ", Start));
    }
}