using Nonemm.Core;

namespace Nonemm.Session.Tests;

public class StatisticsTableTests
{
    private static readonly DateTime Start = new(2026, 1, 1, 0, 0, 0, DateTimeKind.Utc);

    private static Qso Contact(double kilohertz, Mode? mode = null, int minute = 0) => new()
    {
        Id = Qso.NewId(),
        TimestampUtc = Start.AddMinutes(minute),
        Call = Callsign.Parse("DL1ABC"),
        Frequency = Frequency.FromKilohertz(kilohertz),
        Mode = mode ?? Modes.Cw,
        ContestName = "CQWW",
    };

    private static StatisticsTable Of(IReadOnlyList<Qso> log, string row = "Band", string column = "Mode") =>
        StatisticsTable.Of(StatisticsPivot.Of(
            log,
            StatisticsFields.Find(StatisticsFields.Rows, row),
            StatisticsFields.Find(StatisticsFields.Columns, column),
            Start));

    [Fact]
    public void HeadsTheCountsWithTheColumnValuesAndEndsWithTotAndAccum()
    {
        StatisticsTable table = Of([Contact(14_030), Contact(7_030, Modes.Usb)]);

        Assert.Equal(["Band", "CW", "USB", "Tot", "Accum"], table.Headings);
        Assert.Equal(1, table.LabelColumns);
    }

    [Fact]
    public void PutsTheTotalLineLast()
    {
        StatisticsTable table = Of([Contact(14_030), Contact(14_040), Contact(7_030)]);

        Assert.Equal(["40M", "1", "1", "1"], table.Rows[0]);
        Assert.Equal(["20M", "2", "2", "3"], table.Rows[1]);
        Assert.Equal(["Total", "3", "3", "3"], table.Rows[^1]);
    }

    [Fact]
    public void LinesTheColumnsUpUnderTheirHeadings()
    {
        string text = Of([Contact(14_030), Contact(3_530, Modes.Usb), Contact(3_540, Modes.Usb)]).ToText();

        Assert.Equal(
            """
            Band   CW  USB  Tot  Accum
            80M          2    2      2
            20M     1         1      3
            Total   1    2    3      3
            """,
            text.TrimEnd('\n'));
    }

    [Fact]
    public void KeepsTheTwoLabelColumnsOfAFieldThatHasThem()
    {
        StatisticsTable table = Of([Contact(14_030, minute: 5), Contact(14_040, minute: 70)], row: "Hour");

        Assert.Equal(2, table.LabelColumns);
        Assert.Equal(["Day", "Hr", "CW", "Tot", "Accum"], table.Headings);
        Assert.Equal(["2026-01-01", "00", "1", "1", "1"], table.Rows[0]);
        Assert.Equal(["Total", "", "2", "2", "2"], table.Rows[^1]);
    }

    [Fact]
    public void LeavesNoSpacesHangingOffTheEndOfALine()
    {
        string text = Of([Contact(14_030)]).ToText();

        Assert.All(text.Split('\n'), line => Assert.Equal(line.TrimEnd(), line));
    }
}