using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
using ZB.MOM.WW.OtOpcUa.Driver.Historian.Sql.Common;

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

/// <summary>Live value writer behaviour: round-trips, idempotent redelivery, first-wins duplicates, non-finite doubles.</summary>
public abstract class LiveWriteConformance : ConformanceBase
{
    // Non-ms-aligned: sub-millisecond ticks must round-trip exactly (to the backend's resolution).
    private static readonly DateTime T0 = new DateTime(2026, 10, 9, 1, 2, 3, DateTimeKind.Utc).AddTicks(1234567);

    [Fact]
    public async Task Every_kind_round_trips_with_exact_ticks_and_status()
    {
        var w = B.CreateValueWriter();
        var r = B.ResolutionTicks;
        var dt = new DateTime(2026, 1, 2, 3, 4, 5, DateTimeKind.Utc).AddTicks(77 * r);
        HistorizationValue[] vals =
        [
            new(T0, HistorianValue.FromDouble(1.25), 0),
            new(T0.AddTicks(1 * r), HistorianValue.FromInt64(long.MaxValue), 0x40000000u),
            new(T0.AddTicks(2 * r), HistorianValue.FromBoolean(true), 0),
            new(T0.AddTicks(3 * r), HistorianValue.FromString("héllo"), 0),
            new(T0.AddTicks(4 * r), HistorianValue.FromDateTime(dt), 0),
            new(T0.AddTicks(5 * r), HistorianValue.Empty, 0x80310000u),
        ];
        (await w.WriteLiveValuesAsync("tag.a", vals, CancellationToken.None)).ShouldBeTrue();
        var rows = await B.ReadBackAsync("tag.a");
        rows.Count.ShouldBe(6);
        for (var i = 0; i < 6; i++) rows[i].T.Ticks.ShouldBe(B.Round(vals[i].TimestampUtc!.Value).Ticks);
        rows.Select(x => x.V).ToList().ShouldBe(vals.Select(v => v.Value).ToList());
        rows[1].Status.ShouldBe(0x40000000u);
        rows[5].Status.ShouldBe(0x80310000u);
    }

    [Fact]
    public async Task Writing_the_same_batch_twice_is_idempotent()
    {
        var w = B.CreateValueWriter();
        HistorizationValue[] vals = [new(T0, HistorianValue.FromDouble(1), 0), new(T0.AddSeconds(1), HistorianValue.FromDouble(2), 0)];
        (await w.WriteLiveValuesAsync("tag.b", vals, CancellationToken.None)).ShouldBeTrue();
        (await w.WriteLiveValuesAsync("tag.b", vals, CancellationToken.None)).ShouldBeTrue();
        // Overlapping batch: only the new row lands, the stored first value is untouched.
        (await w.WriteLiveValuesAsync("tag.b", [new(T0, HistorianValue.FromDouble(99), 0), new(T0.AddSeconds(2), HistorianValue.FromDouble(3), 0)], CancellationToken.None)).ShouldBeTrue();
        var rows = await B.ReadBackAsync("tag.b");
        rows.Count.ShouldBe(3);
        rows[0].V.Number.ShouldBe(1);
    }

    [Fact]
    public async Task Within_batch_duplicate_timestamps_do_not_fail_and_first_wins()
    {
        var w = B.CreateValueWriter();
        (await w.WriteLiveValuesAsync("tag.c", [new(T0, HistorianValue.FromDouble(1), 0), new(T0, HistorianValue.FromDouble(2), 0)], CancellationToken.None)).ShouldBeTrue();
        var rows = await B.ReadBackAsync("tag.c");
        rows.Count.ShouldBe(1);
        rows[0].V.Number.ShouldBe(1);
    }

    [Fact]
    public async Task Non_finite_doubles_store_as_Empty_forced_Bad_and_do_not_fail_the_write()
    {
        var w = B.CreateValueWriter();
        var r = B.ResolutionTicks;
        (await w.WriteLiveValuesAsync("tag.d", [
            new(T0, HistorianValue.FromDouble(double.NaN), 0x40000000u),
            new(T0.AddTicks(1 * r), HistorianValue.FromDouble(double.PositiveInfinity), 0),
            new(T0.AddTicks(2 * r), HistorianValue.FromDouble(7), 0)], CancellationToken.None)).ShouldBeTrue();
        var rows = await B.ReadBackAsync("tag.d");
        rows.Count.ShouldBe(3);
        rows[0].V.Kind.ShouldBe(HistorianValueKind.Empty);
        rows[0].Status.ShouldBe(HistorianStatusCodes.BadOutOfRange); // Uncertain NaN ⇒ Bad (I-1)
        rows[1].Status.ShouldBe(HistorianStatusCodes.BadOutOfRange); // Good +Inf ⇒ Bad (I-1)
        rows[2].V.Number.ShouldBe(7);
    }

    [Fact]
    public async Task Empty_batch_succeeds_without_a_call_and_null_timestamp_is_stamped()
    {
        var w = B.CreateValueWriter();
        (await w.WriteLiveValuesAsync("tag.e", [], CancellationToken.None)).ShouldBeTrue();
        (await w.WriteLiveValuesAsync("tag.e", [new(null, HistorianValue.FromInt64(5), 0)], CancellationToken.None)).ShouldBeTrue();
        var rows = await B.ReadBackAsync("tag.e");
        rows.Count.ShouldBe(1);
        (DateTime.UtcNow - rows[0].T).ShouldBeLessThan(TimeSpan.FromMinutes(1));
    }

    [Fact]
    public async Task Tag_is_created_with_the_first_typed_values_data_type()
    {
        var w = B.CreateValueWriter();
        await w.WriteLiveValuesAsync("tag.f", [new(T0, HistorianValue.Empty, 0x80310000u), new(T0.AddTicks(B.ResolutionTicks), HistorianValue.FromString("x"), 0)], CancellationToken.None);
        (await B.TagDataTypeAsync("tag.f")).ShouldBe(DriverDataType.String);
    }
}