using MeterVault.Core.Domain;

namespace MeterVault.Core.Tests;

/// <summary>Terse builders for readings/events/configs in normalizer tests.</summary>
internal static class TestData
{
    public static DateTimeOffset Month(int year, int month) =>
        new(new DateTime(year, month, 1, 0, 0, 0, DateTimeKind.Utc));

    /// <summary>
    /// An imported reading. At midnight UTC on the 1st it is a row of a monthly table ("Mai 2026"), flagged
    /// the way the importer flags month names — the shape of the reference data these tests model.
    /// </summary>
    public static Reading Reading(int meterId, DateTimeOffset time, double value) => new()
    {
        MeterId = meterId,
        Time = time,
        Value = value,
        Quality = ReadingQuality.Imported,
        Flags = time.UtcDateTime is { Day: 1, TimeOfDay.Ticks: 0 } ? ReadingFlags.MonthLabel : ReadingFlags.None,
    };

    /// <summary>An imported reading from a day-dated row ("01.08.2026"): an instant, whatever its clock time.</summary>
    public static Reading DayReading(int meterId, DateTimeOffset time, double value) => new()
    {
        MeterId = meterId,
        Time = time,
        Value = value,
        Quality = ReadingQuality.Imported,
    };

    public static MeterEvent Swap(int meterId, DateTimeOffset time, double? prevValue = null,
        double? newValue = null, double? amount = null) => new()
    {
        MeterId = meterId,
        Time = time,
        EventType = MeterEventType.MeterSwap,
        PrevValue = prevValue,
        NewValue = newValue,
        Amount = amount,
    };

    public static MeterEvent Reset(int meterId, DateTimeOffset time, double? newValue = 0, double? prevValue = null) => new()
    {
        MeterId = meterId,
        Time = time,
        EventType = MeterEventType.CounterReset,
        PrevValue = prevValue,
        NewValue = newValue,
    };

    public static MeterEvent Delivery(int meterId, DateTimeOffset time, double litres) => new()
    {
        MeterId = meterId,
        Time = time,
        EventType = MeterEventType.Delivery,
        Amount = litres,
        Unit = "L",
    };

    public static MeterEvent TankLevelCm(int meterId, DateTimeOffset time, double cm) => new()
    {
        MeterId = meterId,
        Time = time,
        EventType = MeterEventType.TankLevel,
        Amount = cm,
        Unit = "cm",
    };
}