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

namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.SqlServer.Tests;

public sealed class AlarmEventIdTests
{
    private static readonly DateTime T = new(2026, 10, 9, 1, 2, 3, DateTimeKind.Utc);

    private static AlarmHistorianEvent Ev(string path = "P", string id = "A", string kind = "Activated", string user = "u",
        string? comment = "c", string msg = "m", DateTime? t = null) =>
        new(id, path, "n", "LimitAlarm", AlarmSeverity.High, kind, msg, user, comment, t ?? T);

    [Fact]
    public void Id_is_stable_lowercase_hex_sha256()
    {
        var a = AlarmEventIds.ComputeEventId(Ev());
        a.ShouldBe(AlarmEventIds.ComputeEventId(Ev()));
        a.Length.ShouldBe(64);
        a.ShouldBe(a.ToLowerInvariant());
    }

    [Fact]
    public void Field_boundaries_are_unambiguous()
    {
        // The delimiter-based scheme collided on these; length prefixes must not.
        AlarmEventIds.ComputeEventId(Ev(path: "a|b", id: "c"))
            .ShouldNotBe(AlarmEventIds.ComputeEventId(Ev(path: "a", id: "b|c")));
        AlarmEventIds.ComputeEventId(Ev(path: "ab", id: "c"))
            .ShouldNotBe(AlarmEventIds.ComputeEventId(Ev(path: "a", id: "bc")));
    }

    [Fact]
    public void Null_and_empty_differ_and_every_field_participates()
    {
        var basis = AlarmEventIds.ComputeEventId(Ev());
        AlarmEventIds.ComputeEventId(Ev(comment: null)).ShouldNotBe(AlarmEventIds.ComputeEventId(Ev(comment: "")));
        foreach (var other in new[]
                 {
                     Ev(path: "Q"), Ev(id: "B"), Ev(kind: "Cleared"), Ev(user: "v"), Ev(comment: "d"), Ev(msg: "x"),
                     Ev(t: T.AddTicks(1)),
                 })
            AlarmEventIds.ComputeEventId(other).ShouldNotBe(basis);
    }

    [Theory]
    [InlineData(typeof(InvalidOperationException))]
    [InlineData(typeof(ArgumentException))]
    [InlineData(typeof(FormatException))]
    public void Non_SQL_exceptions_retry_rather_than_dead_letter(Type type) =>
        SqlServerAlarmHistorianWriter.Classify((Exception)Activator.CreateInstance(type)!)
            .ShouldBe(HistorianWriteOutcome.RetryPlease);
}