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

namespace Nonemm.Session.Tests;

public class QtcTrafficTests
{
    private const string Countries = """
        Germany:                  14:  28:  EU:   51.00:  -10.00:   -1.0:  DL:
            DL,DK,DJ;
        Slovakia:                 15:  28:  EU:   48.70:  -19.50:   -1.0:  OM:
            OM;
        United States:            05:  08:  NA:   37.53:   91.67:    5.0:  K:
            K,W,N,AA,NE;
        Japan:                    25:  45:  AS:   36.40: -138.38:   -9.0:  JA:
            JA,JH,JR;
        """;

    private static readonly StationInfo Slovakia = new()
    {
        Callsign = "OM5M",
        CqZone = 15,
        ItuZone = 28,
        Continent = "EU",
        CountryPrefix = "OM",
    };

    private static readonly StationInfo UnitedStates = new()
    {
        Callsign = "NE1C",
        CqZone = 5,
        ItuZone = 8,
        Continent = "NA",
        CountryPrefix = "K",
    };

    private static (RadioPosition Position, QtcTraffic Traffic) Station(
        ModeCategory mode,
        StationInfo? me = null)
    {
        FakeLogStore store = new();
        ContestInstance instance = store.AddContest(new ContestInstance
        {
            ContestNumber = 0,
            ContestName = "WAERTTY",
        });
        ContestSession session = new(
            store, new Wae(mode), instance, me ?? Slovakia, CountryFile.Parse(Countries));
        RadioPosition position = new(session);
        return (position, new QtcTraffic(position));
    }

    private static Qso Contact(
        RadioPosition position,
        string call,
        int receivedNumber,
        int sentNumber,
        int minute) =>
        position.Session.Add(new Qso
        {
            Id = Qso.NewId(),
            TimestampUtc = new DateTime(2026, 11, 14, 13, minute, 0, DateTimeKind.Utc),
            Call = Callsign.Parse(call),
            Frequency = Frequency.FromKilohertz(14_080),
            Mode = Modes.Rtty,
            ContestName = "WAERTTY",
            ReceivedNumber = receivedNumber,
            SentNumber = sentNumber,
            Exchange1 = WaeQtc.Contact,
        });

    [Fact]
    public void OnCwEuropeReceivesAndTheRestOfTheWorldSends()
    {
        (_, QtcTraffic european) = Station(ModeCategory.Cw);
        (_, QtcTraffic american) = Station(ModeCategory.Cw, UnitedStates);

        Assert.Equal(QtcDirection.Receive, european.DirectionFor(Callsign.Parse("NE1C"), out _));
        Assert.Equal(QtcDirection.Send, american.DirectionFor(Callsign.Parse("DL9XYZ"), out _));
    }

    [Fact]
    public void OnCwThereIsNoTrafficWithinEurope()
    {
        (_, QtcTraffic traffic) = Station(ModeCategory.Cw);

        Assert.Equal(QtcDirection.None, traffic.DirectionFor(Callsign.Parse("DL9XYZ"), out string why));
        Assert.Contains("Europe", why);
    }

    [Fact]
    public void OnRttyTrafficGoesBothWaysBetweenContinents()
    {
        (_, QtcTraffic traffic) = Station(ModeCategory.Digital);

        Assert.Equal(QtcDirection.Either, traffic.DirectionFor(Callsign.Parse("JA1XYZ"), out _));
    }

    [Fact]
    public void OnRttyThereIsNoTrafficWithinOneContinent()
    {
        (_, QtcTraffic traffic) = Station(ModeCategory.Digital);

        Assert.Equal(QtcDirection.None, traffic.DirectionFor(Callsign.Parse("DL9XYZ"), out string why));
        Assert.Contains("continent", why);
    }

    [Fact]
    public void TenLinesIsAllAnyStationGets()
    {
        (RadioPosition position, QtcTraffic traffic) = Station(ModeCategory.Digital);
        for (int at = 1; at <= 10; at++)
        {
            position.Session.Add(new WaeQtc(
                Callsign.Parse("JA1XYZ"), IsSent: true, 1, 10, "1300", Callsign.Parse("DL9XYZ"), at)
                .ApplyTo(Contact(position, "K1ABC", at, at, at)));
        }

        Assert.Equal(0, traffic.Remaining(Callsign.Parse("JA1XYZ")));
        Assert.Equal(QtcDirection.None, traffic.DirectionFor(Callsign.Parse("JA1XYZ"), out string why));
        Assert.Contains("ten QTCs", why);
    }

    [Fact]
    public void WhatIsSentIsTheContactsNotReportedYetOldestFirst()
    {
        (RadioPosition position, QtcTraffic traffic) = Station(ModeCategory.Digital);
        Contact(position, "DL1AAA", receivedNumber: 16, sentNumber: 1, minute: 46);
        Contact(position, "DL2BBB", receivedNumber: 40, sentNumber: 2, minute: 47);
        Contact(position, "JA1XYZ", receivedNumber: 7, sentNumber: 3, minute: 48);

        IReadOnlyList<WaeQtc> lines = traffic.ToSend(Callsign.Parse("JA1XYZ"));

        Assert.Equal(["DL1AAA", "DL2BBB"], lines.Select(l => l.Call.Text).ToList());
        Assert.Equal(["1346", "1347"], lines.Select(l => l.TimeUtc).ToList());
        Assert.Equal([16, 40], lines.Select(l => l.Number).ToList());
        Assert.All(lines, line => Assert.Equal("1/2", line.SeriesText));
    }

    [Fact]
    public void AContactAlreadyReportedIsNotReportedAgain()
    {
        (RadioPosition position, QtcTraffic traffic) = Station(ModeCategory.Digital);
        Contact(position, "DL1AAA", receivedNumber: 16, sentNumber: 1, minute: 46);
        Contact(position, "DL2BBB", receivedNumber: 40, sentNumber: 2, minute: 47);
        WaeQtc first = traffic.ToSend(Callsign.Parse("JA1XYZ"))[0];
        position.Session.Add(first.ApplyTo(Contact(position, "JA1XYZ", 1, 3, 50)));

        Assert.Equal(["DL2BBB"], traffic.ToSend(Callsign.Parse("JA1XYZ")).Select(l => l.Call.Text).ToList());
    }

    /// Series are numbered across the contest, so the next one carries on from
    /// the last series sent to anybody.
    [Fact]
    public void SeriesAreNumberedAcrossTheContest()
    {
        (RadioPosition position, QtcTraffic traffic) = Station(ModeCategory.Digital);
        Assert.Equal(1, traffic.NextSeries());

        position.Session.Add(new WaeQtc(
            Callsign.Parse("JA1XYZ"), IsSent: true, 86, 10, "1300", Callsign.Parse("DL9XYZ"), 5)
            .ApplyTo(Contact(position, "JA1XYZ", 1, 1, 55)));

        Assert.Equal(87, traffic.NextSeries());
    }

    [Theory]
    [InlineData("1346", "DL2UH", "40")]
    [InlineData("0001", "2E0GYI", "1")]
    public void AWellFormedLineReadsAsAQtc(string time, string call, string number) =>
        Assert.NotNull(QtcTraffic.Read(
            Callsign.Parse("NE1C"), isSent: false, 87, 10, time, call, number));

    [Theory]
    [InlineData("134", "DL2UH", "40")]
    [InlineData("2401", "DL2UH", "40")]
    [InlineData("1360", "DL2UH", "40")]
    [InlineData("1346", "DL", "40")]
    [InlineData("1346", "DL2UH", "")]
    [InlineData("1346", "DL2UH", "abc")]
    public void ALineThatIsNotAQtcReadsAsNothing(string time, string call, string number) =>
        Assert.Null(QtcTraffic.Read(
            Callsign.Parse("NE1C"), isSent: false, 87, 10, time, call, number));

    /// The header is copied off the air, so whatever separates the two numbers
    /// is taken as the separator.
    [Theory]
    [InlineData("87/10")]
    [InlineData("87 10")]
    [InlineData("87-10")]
    [InlineData("QTC 87/10")]
    public void AHeaderIsASeriesAndACount(string text)
    {
        (int series, int count) = Assert.IsType<(int, int)>(QtcTraffic.ReadHeader(text));

        Assert.Equal(87, series);
        Assert.Equal(10, count);
    }

    [Theory]
    [InlineData("")]
    [InlineData("87")]
    [InlineData("87/11")]
    [InlineData("abc/10")]
    public void AHeaderThatIsNotOneReadsAsNothing(string text) =>
        Assert.Null(QtcTraffic.ReadHeader(text));
}