using System.Text.Json;
using Akka.Actor;
using Akka.Cluster.Tools.PublishSubscribe;
using Akka.TestKit;
using Microsoft.EntityFrameworkCore;
using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Commons.Engines;
using ZB.MOM.WW.OtOpcUa.Commons.Messages.Alerts;
using ZB.MOM.WW.OtOpcUa.Commons.Messages.Deploy;
using ZB.MOM.WW.OtOpcUa.Commons.Types;
using ZB.MOM.WW.OtOpcUa.Configuration;
using ZB.MOM.WW.OtOpcUa.Configuration.Entities;
using ZB.MOM.WW.OtOpcUa.Configuration.Enums;
using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
using ZB.MOM.WW.OtOpcUa.Driver.AbCip;
using ZB.MOM.WW.OtOpcUa.Runtime.Drivers;
using ZB.MOM.WW.OtOpcUa.Runtime.OpcUa;
using ZB.MOM.WW.OtOpcUa.Runtime.ScriptedAlarms;
using ZB.MOM.WW.OtOpcUa.Runtime.Tests.Harness;

namespace ZB.MOM.WW.OtOpcUa.Runtime.Tests.Drivers;

/// <summary>
///     Gitea #611 item 1 (hw4 review L3) — an AbCip ALMA reaches its Part 9 condition and its <c>/alerts</c> rows END
///     TO END: the REAL <see cref="AbCipDriver"/> (polling a fake controller, ab_server/Z35162 have no ALMA) raises into
///     the REAL <see cref="DriverHostActor"/>, and the test reads what <c>ForwardNativeAlarm</c> +
///     <c>NativeAlarmProjector</c> turned the projection's events into. The row level is where a drop-out's false
///     "Activated" and a surviving limit's false "Acknowledged" show — the driver's own events look fine.
/// </summary>
public sealed class AbCipAlmaNativeAlarmEndToEndTests : RuntimeActorTestBase
{
    private static readonly NodeId TestNode = NodeId.Parse("abcip-alma-e2e");
    private static readonly RevisionHash Rev = RevisionHash.Parse(new string('c', 64));
    private static readonly TimeSpan Wait = TimeSpan.FromSeconds(5);
    private static readonly TimeSpan Quiet = TimeSpan.FromMilliseconds(600);

    private const string DriverId = "drv-abcip";
    private const string Device = "ab://10.0.0.5/1,0";
    private const string TagPath = "HighPress";
    private const string RawPath = "Plant/AbCip/plc/hp";

    private static readonly string[] Bits =
        ["HHInAlarm", "HInAlarm", "LInAlarm", "LLInAlarm", "HHAcked", "HAcked", "LAcked", "LLAcked"];
    private static readonly string[] Sevs = ["HHSeverity", "HSeverity", "LSeverity", "LLSeverity"];

    /// <summary>
    ///     raise (H) → escalate (HH enters: Retrigger) → HH drops out (no row, node text moves to H) → the PLC acks
    ///     everything (ONE "Acknowledged") → HH excursion unacked then gone (still unacked, no false ack) → clear.
    /// </summary>
    [Fact]
    public async Task An_ALMA_walks_raise_escalate_dropout_ack_clear_with_the_right_rows()
    {
        var db = NewInMemoryDbFactory();
        var alerts = SubscribeAlerts();
        var (host, publish) = SpawnHostAndApply(db, Seed(db, BuildArtifact(), Rev));
        var plc = new FakePlc();
        foreach (var b in Bits) plc.Set(b, false);
        plc.Set("HHSeverity", 900); plc.Set("HSeverity", 600); plc.Set("LSeverity", 300); plc.Set("LLSeverity", 800);

        var drv = new AbCipDriver(
            new AbCipDriverOptions
            {
                Devices = [new AbCipDeviceOptions(Device)],
                RawTags = [new RawTagEntry(RawPath, TagConfig(), false, Device)],
                EnableAlarmProjection = true,
                AlarmPollInterval = TimeSpan.FromMilliseconds(20),
            },
            DriverId, plc);
        try
        {
            await drv.InitializeAsync("{}", CancellationToken.None);
            drv.OnAlarmEvent += (_, e) => host.Tell(new DriverInstanceActor.AttributeAlarmPublished(DriverId, e));
#pragma warning disable OTOPCUA0001 // the routing is under test, not resilience wrapping
            await drv.SubscribeAlarmsAsync([RawPath], CancellationToken.None);
#pragma warning restore OTOPCUA0001

            // Raise: H.
            plc.Set("HInAlarm", true);
            var raised = NextUpdate(publish);
            raised.AlarmNodeId.ShouldBe(RawPath);
            raised.State.Active.ShouldBeTrue();
            raised.State.Acknowledged.ShouldBeFalse();
            raised.State.Message.ShouldContain("H alarm");
            Row(alerts).TransitionKind.ShouldBe("Activated");

            // Escalate: HH enters while H stands — a new unacknowledged occurrence.
            plc.Set("HHInAlarm", true);
            var esc = NextUpdate(publish);
            esc.State.Active.ShouldBeTrue();
            esc.State.Acknowledged.ShouldBeFalse();
            esc.State.Message.ShouldContain("HH alarm");
            Row(alerts).TransitionKind.ShouldBe("Activated");

            // HH drops out, H stands: text/severity move to H, but nothing new happened — NO row.
            plc.Set("HHInAlarm", false);
            var drop = NextUpdate(publish);
            drop.State.Active.ShouldBeTrue();
            drop.State.Acknowledged.ShouldBeFalse();
            drop.State.Message.ShouldContain("H alarm");
            drop.State.Message.ShouldNotContain("HH");
            drop.State.Severity.ShouldBe((ushort)600);
            alerts.ExpectNoMsg(Quiet);

            // The PLC acknowledges every declared limit — ONE "Acknowledged" row.
            foreach (var a in new[] { "HHAcked", "HAcked", "LAcked", "LLAcked" }) plc.Set(a, true);
            NextUpdate(publish).State.Acknowledged.ShouldBeTrue();
            Row(alerts).TransitionKind.ShouldBe("Acknowledged");

            // An HH excursion nobody acknowledges (HHAcked drops, HH enters then leaves): the surviving, acked H
            // must not turn into a device "Acknowledged" for it.
            plc.Set("HHAcked", false);
            plc.Set("HHInAlarm", true);
            NextUpdate(publish).State.Acknowledged.ShouldBeFalse();
            Row(alerts).TransitionKind.ShouldBe("Activated");
            plc.Set("HHInAlarm", false);
            var back = NextUpdate(publish);
            back.State.Acknowledged.ShouldBeFalse("the unacknowledged HH excursion keeps the condition unacknowledged");
            alerts.ExpectNoMsg(Quiet);

            // Positive control: the clear MUST write its row (the absence checks above would pass on a dead host).
            plc.Set("HInAlarm", false);
            var cleared = NextUpdate(publish);
            cleared.State.Active.ShouldBeFalse();
            Row(alerts).TransitionKind.ShouldBe("Cleared");
        }
        finally
        {
            await drv.ShutdownAsync(CancellationToken.None);
            drv.Dispose();
        }
    }

    private AlarmTransitionEvent Row(TestProbe alerts) => alerts.ExpectMsg<AlarmTransitionEvent>(Wait);

    private static OpcUaPublishActor.AlarmStateUpdate NextUpdate(TestProbe publish) =>
        publish.FishForMessage<OpcUaPublishActor.AlarmStateUpdate>(_ => true, Wait);

    private TestProbe SubscribeAlerts()
    {
        var alerts = CreateTestProbe();
        DistributedPubSub.Get(Sys).Mediator.Tell(new Subscribe(ScriptedAlarmHostActor.AlertsTopic, alerts.Ref), alerts.Ref);
        alerts.ExpectMsg<SubscribeAck>(Wait);
        return alerts;
    }

    private static string TagConfig()
    {
        var members = Bits.Select(n => (object)new { name = n, dataType = "Bool" })
            .Concat(Sevs.Select(n => (object)new { name = n, dataType = "DInt" })).ToArray();
        return JsonSerializer.Serialize(new
        {
            tagPath = TagPath,
            dataType = "Structure",
            members,
            alarm = new { alarmType = "AlarmCondition", severity = 800 },
        });
    }

    private static byte[] BuildArtifact() =>
        JsonSerializer.SerializeToUtf8Bytes(new
        {
            RawFolders = new[] { new { RawFolderId = "rf-plant", ParentRawFolderId = (string?)null, Name = "Plant", ClusterId = "c1" } },
            DriverInstances = new[]
            {
                // Enabled=false: the host must not spawn a real wire driver — the test drives its own instance.
                new { DriverInstanceId = DriverId, RawFolderId = "rf-plant", Name = "AbCip", DriverType = DriverTypeNames.AbCip, DriverConfig = "{}", ClusterId = "c1", Enabled = false },
            },
            Devices = new[] { new { DeviceId = "dev-1", DriverInstanceId = DriverId, Name = "plc", DeviceConfig = "{}" } },
            TagGroups = Array.Empty<object>(),
            Tags = new[]
            {
                new { TagId = "tag-alarm", DeviceId = "dev-1", TagGroupId = (string?)null, Name = "hp",
                      DataType = "Boolean", AccessLevel = 0, TagConfig = TagConfig() },
            },
        });

    private static DeploymentId Seed(IDbContextFactory<OtOpcUaConfigDbContext> db, byte[] blob, RevisionHash rev)
    {
        var id = DeploymentId.NewId();
        using var ctx = db.CreateDbContext();
        ctx.Deployments.Add(new Deployment
        {
            DeploymentId = id.Value, RevisionHash = rev.Value, Status = DeploymentStatus.Sealed,
            CreatedBy = "test", SealedAtUtc = DateTime.UtcNow, ArtifactBlob = blob,
        });
        ctx.SaveChanges();
        return id;
    }

    private (IActorRef Actor, TestProbe Publish) SpawnHostAndApply(IDbContextFactory<OtOpcUaConfigDbContext> db, DeploymentId deploymentId)
    {
        var coordinator = CreateTestProbe();
        var publish = this.CreateCleanOutcomePublishProbe();
        var actor = Sys.ActorOf(DriverHostActor.Props(
            db, TestNode, coordinator.Ref,
            localRoles: new HashSet<string> { "driver" },
            dependencyMux: CreateTestProbe().Ref,
            opcUaPublishActor: publish.Ref,
            virtualTagEvaluator: NullVirtualTagEvaluator.Instance,
            virtualTagHostOverride: CreateTestProbe().Ref));
        actor.Tell(new DispatchDeployment(deploymentId, Rev, CorrelationId.NewId()));
        coordinator.ExpectMsg<ApplyAck>(Wait).Outcome.ShouldBe(ApplyAckOutcome.Applied);
        publish.ExpectMsg<OpcUaPublishActor.RebuildAddressSpace>(Wait);
        return (actor, publish);
    }

    /// <summary>A fake controller: every member runtime answers from one shared value table, keyed by member name.</summary>
    private sealed class FakePlc : IAbCipTagFactory
    {
        private readonly System.Collections.Concurrent.ConcurrentDictionary<string, object?> _values = new();
        public void Set(string member, object value) => _values[member] = value;
        public IAbCipTagRuntime Create(AbCipTagCreateParams p) => new Runtime(this, p.TagName[(p.TagName.LastIndexOf('.') + 1)..]);

        private sealed class Runtime(FakePlc plc, string member) : IAbCipTagRuntime
        {
            public Task InitializeAsync(CancellationToken ct) => Task.CompletedTask;
            public Task ReadAsync(CancellationToken ct) => Task.CompletedTask;
            public Task WriteAsync(CancellationToken ct) => Task.CompletedTask;
            public int GetStatus() => 0;
            public object? DecodeValue(AbCipDataType type, int? bitIndex) => plc._values.GetValueOrDefault(member);
            public object? DecodeValueAt(AbCipDataType type, int offset, int? bitIndex) => null;
            public object? DecodeArray(AbCipDataType type, int count) => null;
            public void EncodeValue(AbCipDataType type, int? bitIndex, object? value) { }
            public void Dispose() { }
        }
    }
}