using ZB.MOM.WW.OtOpcUa.Core.Abstractions;

namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Conformance;

/// <summary>Shared fixture data of the conformance suite. <see cref="T0"/> is deliberately NOT millisecond- or microsecond-aligned.</summary>
public static class ConformanceData
{
    /// <summary>Base time: 2026-10-09 08:00:00.1234567 UTC (sub-millisecond ticks on purpose).</summary>
    public static readonly DateTime T0 = new DateTime(2026, 10, 9, 8, 0, 0, DateTimeKind.Utc).AddTicks(1_234_567);

    /// <summary>Good.</summary>
    public const uint Good = 0x00000000u;
    /// <summary>Bad (generic).</summary>
    public const uint Bad = 0x80000000u;
    /// <summary>BadNoCommunication.</summary>
    public const uint BadNoCommunication = 0x80310000u;
    /// <summary>Uncertain (generic).</summary>
    public const uint Uncertain = 0x40000000u;

    /// <summary>T0 + <paramref name="seconds"/> seconds.</summary>
    public static DateTime At(double seconds) => T0.AddTicks((long)(seconds * TimeSpan.TicksPerSecond));

    /// <summary>The fixture tag A: +0=10, +10=20, +20=Bad(30), +30=40, +40=50 (Double).</summary>
    public static Task SeedAAsync(IConformanceBackend b, string name = "A") => b.SeedAsync(name,
        (At(0), HistorianValue.FromDouble(10), Good),
        (At(10), HistorianValue.FromDouble(20), Good),
        (At(20), HistorianValue.FromDouble(30), Bad),
        (At(30), HistorianValue.FromDouble(40), Good),
        (At(40), HistorianValue.FromDouble(50), Good));
}

/// <summary>A settable clock for a data source's "now".</summary>
public sealed class ConformanceClock(DateTimeOffset now) : TimeProvider
{
    /// <summary>The current instant.</summary>
    public DateTimeOffset Now { get; set; } = now;

    /// <inheritdoc/>
    public override DateTimeOffset GetUtcNow() => Now;
}