using MeterVault.Core.Domain;
using MeterVault.Infrastructure.Import;

namespace MeterVault.Integration.Tests.Import;

/// <summary>
/// The importer is the only place that still sees whether a date cell named a month or a day, so it is
/// where a row becomes a month label. Both are stamped at midnight on the 1st; only the month means
/// "the register at the end of that month". Pure, so no Docker.
/// </summary>
public sealed class MonthLabelImportTests
{
    [Theory]
    [InlineData(DateKind.MonthName, "August 2026", true)]
    [InlineData(DateKind.DayDotMonthYear, "01.08.2026", false)]
    [InlineData(DateKind.Auto, "August 2026", true)]
    [InlineData(DateKind.Auto, "01.08.2026", false)]
    public void A_row_is_a_month_label_only_when_its_date_named_a_month(DateKind kind, string date, bool label)
    {
        var reading = Assert.Single(Stage(kind, anchorToEnd: false, $"{date},700").Readings);

        Assert.Equal(new DateTimeOffset(2026, 8, 1, 0, 0, 0, TimeSpan.Zero), reading.Time);
        Assert.Equal(label, reading.Flags.HasFlag(ReadingFlags.MonthLabel));
    }

    [Fact]
    public void A_month_anchored_to_its_last_day_is_stamped_where_it_belongs_and_is_no_label()
    {
        var reading = Assert.Single(Stage(DateKind.Auto, anchorToEnd: true, "August 2026,700").Readings);

        Assert.Equal(new DateTimeOffset(2026, 8, 31, 0, 0, 0, TimeSpan.Zero), reading.Time);
        Assert.False(reading.Flags.HasFlag(ReadingFlags.MonthLabel));
    }

    private static StagedImport Stage(DateKind kind, bool anchorToEnd, string row)
    {
        var profile = new MappingProfile
        {
            Name = "test",
            DateColumn = 0,
            DateKind = kind,
            AnchorMonthsToEnd = anchorToEnd,
            FirstDataRowIndex = 0,
            Columns = [new ColumnMapping { Index = 1, Role = MappingRole.Reading, MeterId = 1, Unit = "m3" }],
        };

        using var reader = new StringReader(row);
        return new CsvImporter().Stage(profile, reader);
    }
}