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

namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Sql.Common.Tests;

/// <summary>EventContinuation, HistorianHealthCounters, ClampSeverity and the StoredSample quality clamp.</summary>
public sealed class SharedHelperTests
{
    [Fact]
    public void Event_continuation_is_ticks_pipe_event_id()
    {
        var t = new DateTime(2026, 10, 9, 8, 0, 0, DateTimeKind.Utc).AddTicks(1234567);
        EventContinuation.Encode(t, "abc").ShouldBe($"{t.Ticks.ToString(System.Globalization.CultureInfo.InvariantCulture)}|abc");
        EventContinuation.Encode(new DateTime(42), "id").ShouldBe("42|id");
    }

    [Theory]
    [InlineData(-5, 0)]
    [InlineData(700, 700)]
    [InlineData(70_000, 65_535)]
    public void Event_severity_is_clamped_to_ushort(int stored, int expected) =>
        HistoricalEventRows.ClampSeverity(stored).ShouldBe((ushort)expected);

    [Fact]
    public void Health_counters_open_only_after_a_success_with_no_failure_since()
    {
        var h = new HistorianHealthCounters();
        h.Snapshot().ProcessConnectionOpen.ShouldBeFalse();
        h.RecordSuccess();
        h.Snapshot().ProcessConnectionOpen.ShouldBeTrue();
        h.RecordFailure(new InvalidOperationException("boom"));
        var s = h.Snapshot();
        s.ProcessConnectionOpen.ShouldBeFalse();
        s.EventConnectionOpen.ShouldBeFalse();
        s.ConsecutiveFailures.ShouldBe(1);
        s.TotalQueries.ShouldBe(2);
        s.LastError.ShouldBe("InvalidOperationException: boom");
        h.RecordSuccess();
        h.Snapshot().ConsecutiveFailures.ShouldBe(0);
        h.Snapshot().ProcessConnectionOpen.ShouldBeTrue();
    }

    [Fact]
    public void A_cancellation_is_not_a_health_failure()
    {
        var h = new HistorianHealthCounters();
        h.RecordFailure(new OperationCanceledException());
        h.RecordFailure(new TaskCanceledException());
        var s = h.Snapshot();
        s.TotalQueries.ShouldBe(0);
        s.TotalFailures.ShouldBe(0);
        s.LastError.ShouldBeNull();
    }

    [Fact]
    public void A_stored_empty_sample_with_a_non_bad_status_is_served_BadNoData()
    {
        var t = DateTime.UnixEpoch;
        StoredSample.FromStored(t, HistorianValue.Empty, 0u).Status.ShouldBe(0x809B0000u);
        StoredSample.FromStored(t, HistorianValue.Empty, 0x40000000u).Status.ShouldBe(0x809B0000u);
        StoredSample.FromStored(t, HistorianValue.Empty, 0x80310000u).Status.ShouldBe(0x80310000u);
        StoredSample.FromStored(t, HistorianValue.FromDouble(1), 0x40000000u).Status.ShouldBe(0x40000000u);
        StoredSample.FromStored(t, HistorianValue.Empty, 0x80310000u).IsUsable.ShouldBeFalse();
        StoredSample.FromStored(t, HistorianValue.FromDouble(1), 0x40000000u).IsGood.ShouldBeFalse();
    }
}