using Akka.Actor;
using Akka.TestKit;
using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Commons.Messages.Admin;
using ZB.MOM.WW.OtOpcUa.Commons.Messages.Deploy;
using ZB.MOM.WW.OtOpcUa.Commons.Types;
using ZB.MOM.WW.OtOpcUa.Configuration.Enums;
using ZB.MOM.WW.OtOpcUa.ControlPlane.AdminOperations;
using ZB.MOM.WW.OtOpcUa.ControlPlane.Tests.Harness;
using ZB.MOM.WW.OtOpcUa.Core.Abstractions;

namespace ZB.MOM.WW.OtOpcUa.ControlPlane.Tests;

public sealed class AdminOperationsActorTests : ControlPlaneActorTestBase
{
    /// <summary>Verifies that starting a deployment inserts a row and dispatches to the coordinator.</summary>
    [Fact]
    public void StartDeployment_inserts_deployment_and_dispatches_to_coordinator()
    {
        var dbFactory = NewInMemoryDbFactory();
        var coordinator = CreateTestProbe("coord");
        var actor = Sys.ActorOf(AdminOperationsActor.Props(dbFactory, coordinator.Ref, Enumerable.Empty<IDriverProbe>()));

        actor.Tell(new StartDeployment("joe", CorrelationId.NewId()));

        var dispatch = coordinator.ExpectMsg<DispatchDeployment>(TimeSpan.FromSeconds(3));
        dispatch.DeploymentId.Value.ShouldNotBe(Guid.Empty);
        dispatch.RevisionHash.Value.Length.ShouldBe(64);

        var reply = ExpectMsg<StartDeploymentResult>(TimeSpan.FromSeconds(3));
        reply.Outcome.ShouldBe(StartDeploymentOutcome.Accepted);
        reply.DeploymentId.ShouldBe(dispatch.DeploymentId);
        reply.RevisionHash.ShouldBe(dispatch.RevisionHash);

        using var db = dbFactory.CreateDbContext();
        var row = db.Deployments.Single();
        row.Status.ShouldBe(DeploymentStatus.Dispatching);
        row.CreatedBy.ShouldBe("joe");
        row.ArtifactBlob.Length.ShouldBeGreaterThan(0);

        db.ConfigEdits.Count().ShouldBe(1);
        db.ConfigEdits.Single().EntityType.ShouldBe("Deployment");
    }

    /// <summary>Verifies the full DraftValidator gate (reject on ANY error): a Tag↔VirtualTag
    /// NodeId collision in the live config rejects the deploy (422-mapped
    /// <see cref="StartDeploymentOutcome.Rejected"/>) before any coordinator dispatch — and inserts
    /// no Deployment row. The colliding equipment uses a canonical EquipmentId so the rejection is
    /// attributable to the collision rule, not to EquipmentIdNotDerived.</summary>
    [Fact]
    public void StartDeployment_rejects_on_Tag_VirtualTag_NodeId_collision()
    {
        var uuid = Guid.NewGuid();
        var equipmentId = Configuration.Validation.DraftValidator.DeriveEquipmentId(uuid);

        var dbFactory = NewInMemoryDbFactory();
        using (var db = dbFactory.CreateDbContext())
        {
            db.Equipment.Add(new Configuration.Entities.Equipment
            {
                EquipmentUuid = uuid,
                EquipmentId = equipmentId,
                Name = "eq",
                DriverInstanceId = "d",
                UnsLineId = "line-a",
                MachineCode = "m",
            });
            db.Tags.Add(new Configuration.Entities.Tag
            {
                TagId = "tag-speed",
                DriverInstanceId = "d",
                EquipmentId = equipmentId,
                Name = "speed",
                DataType = "Float",
                AccessLevel = TagAccessLevel.Read,
                TagConfig = "{}",
            });
            db.VirtualTags.Add(new Configuration.Entities.VirtualTag
            {
                VirtualTagId = "vtag-speed",
                EquipmentId = equipmentId,
                Name = "speed",
                DataType = "Float",
                ScriptId = "s-1",
            });
            db.SaveChanges();
        }

        var coordinator = CreateTestProbe("coord");
        var actor = Sys.ActorOf(AdminOperationsActor.Props(dbFactory, coordinator.Ref, Enumerable.Empty<IDriverProbe>()));

        actor.Tell(new StartDeployment("joe", CorrelationId.NewId()));

        coordinator.ExpectNoMsg(TimeSpan.FromMilliseconds(500));
        var reply = ExpectMsg<StartDeploymentResult>(TimeSpan.FromSeconds(3));
        reply.Outcome.ShouldBe(StartDeploymentOutcome.Rejected);
        reply.Message.ShouldNotBeNull();
        reply.Message.ShouldContain("EquipmentSignalNameCollision");   // the rule's error code
        reply.Message.ShouldContain("collide");                        // the rule's message text

        using var verify = dbFactory.CreateDbContext();
        verify.Deployments.Count().ShouldBe(0);
    }

    /// <summary>Verifies the full gate rejects a config whose Equipment carries a NON-canonical
    /// EquipmentId (not == <c>DraftValidator.DeriveEquipmentId(uuid)</c>): the deploy is
    /// <see cref="StartDeploymentOutcome.Rejected"/> with <c>EquipmentIdNotDerived</c> in the message,
    /// no coordinator dispatch, and no Deployment row. This is the rule the surgical gate used to
    /// let through and the reason the full activation was probed first.</summary>
    [Fact]
    public void StartDeployment_rejects_on_non_canonical_EquipmentId()
    {
        var dbFactory = NewInMemoryDbFactory();
        using (var db = dbFactory.CreateDbContext())
        {
            db.Equipment.Add(new Configuration.Entities.Equipment
            {
                EquipmentUuid = Guid.NewGuid(),
                EquipmentId = "EQ-operator-typed",   // NOT derived from the UUID
                Name = "rinser-01",
                DriverInstanceId = "d",
                UnsLineId = "line-a",
                MachineCode = "m",
            });
            db.SaveChanges();
        }

        var coordinator = CreateTestProbe("coord");
        var actor = Sys.ActorOf(AdminOperationsActor.Props(dbFactory, coordinator.Ref, Enumerable.Empty<IDriverProbe>()));

        actor.Tell(new StartDeployment("joe", CorrelationId.NewId()));

        coordinator.ExpectNoMsg(TimeSpan.FromMilliseconds(500));
        var reply = ExpectMsg<StartDeploymentResult>(TimeSpan.FromSeconds(3));
        reply.Outcome.ShouldBe(StartDeploymentOutcome.Rejected);
        reply.Message.ShouldNotBeNull();
        reply.Message.ShouldContain("EquipmentIdNotDerived");

        using var verify = dbFactory.CreateDbContext();
        verify.Deployments.Count().ShouldBe(0);
    }

    /// <summary>Verifies that a DriverInstance whose NamespaceId lives in a different cluster
    /// triggers <c>BadCrossClusterNamespaceBinding</c> and routes to the Rejected branch through
    /// the actor — no coordinator dispatch, no Deployment row.
    /// Seeded: Namespace in cluster "MAIN" + DriverInstance in cluster "SITE-A" referencing that
    /// namespace. NamespaceKind.Equipment + DriverType "ModbusTcp" satisfies the compat rule so
    /// only the cross-cluster rule fires.</summary>
    [Fact]
    public void StartDeployment_rejects_on_cross_cluster_namespace_binding()
    {
        const string nsId = "ns-main-equipment";

        var dbFactory = NewInMemoryDbFactory();
        using (var db = dbFactory.CreateDbContext())
        {
            db.Namespaces.Add(new Configuration.Entities.Namespace
            {
                NamespaceId  = nsId,
                ClusterId    = "MAIN",
                Kind         = Configuration.Enums.NamespaceKind.Equipment,
                NamespaceUri = "urn:zb:main:equipment",
            });
            db.DriverInstances.Add(new Configuration.Entities.DriverInstance
            {
                DriverInstanceId = "drv-site-a-01",
                ClusterId        = "SITE-A",
                NamespaceId      = nsId,          // cross-cluster: drv is SITE-A, ns is MAIN
                Name             = "site-a-modbus",
                DriverType       = "ModbusTcp",   // compatible with Equipment ns — no compat error
                DriverConfig     = "{}",
            });
            db.SaveChanges();
        }

        var coordinator = CreateTestProbe("coord");
        var actor = Sys.ActorOf(AdminOperationsActor.Props(dbFactory, coordinator.Ref, Enumerable.Empty<IDriverProbe>()));

        actor.Tell(new StartDeployment("joe", CorrelationId.NewId()));

        coordinator.ExpectNoMsg(TimeSpan.FromMilliseconds(500));
        var reply = ExpectMsg<StartDeploymentResult>(TimeSpan.FromSeconds(3));
        reply.Outcome.ShouldBe(StartDeploymentOutcome.Rejected);
        reply.Message.ShouldNotBeNull();
        reply.Message.ShouldContain("BadCrossClusterNamespaceBinding");

        using var verify = dbFactory.CreateDbContext();
        verify.Deployments.Count().ShouldBe(0);
    }

    /// <summary>Verifies the warn-only compile-cost advisory: seeding N distinct non-passthrough
    /// (genuinely-compiled) Script rows yields an <see cref="StartDeploymentOutcome.Accepted"/>
    /// deploy whose <see cref="StartDeploymentResult.Message"/> carries a compile-cost advisory.
    /// The guardrail NEVER rejects — it only surfaces the estimated RSS pressure to the operator.</summary>
    [Fact]
    public void StartDeployment_warns_when_many_scripts_will_compile()
    {
        const int n = 10;
        var dbFactory = NewInMemoryDbFactory();
        using (var db = dbFactory.CreateDbContext())
        {
            for (var i = 0; i < n; i++)
            {
                db.Scripts.Add(new Configuration.Entities.Script
                {
                    ScriptId = $"s-{i}",
                    Name = $"script-{i}",
                    SourceCode = $"return (int)ctx.GetTag(\"a\").Value + {i};",   // distinct, non-passthrough
                    SourceHash = $"hash-{i}",
                });
            }
            db.SaveChanges();
        }

        var coordinator = CreateTestProbe("coord");
        var actor = Sys.ActorOf(AdminOperationsActor.Props(dbFactory, coordinator.Ref, Enumerable.Empty<IDriverProbe>()));

        actor.Tell(new StartDeployment("joe", CorrelationId.NewId()));

        // Still dispatches — the advisory is non-blocking.
        coordinator.ExpectMsg<DispatchDeployment>(TimeSpan.FromSeconds(3));

        var reply = ExpectMsg<StartDeploymentResult>(TimeSpan.FromSeconds(3));
        reply.Outcome.ShouldBe(StartDeploymentOutcome.Accepted);
        reply.Message.ShouldNotBeNull();
        reply.Message.ShouldContain("will compile");
        reply.Message.ShouldContain($"{n} script");   // the distinct compiled count

        using var verify = dbFactory.CreateDbContext();
        verify.Deployments.Count().ShouldBe(1);
    }

    /// <summary>Verifies that passthrough "mirror" scripts (<c>return ctx.GetTag("X").Value;</c>)
    /// compile to ~nothing and therefore do NOT count toward the compile-cost advisory: a deploy
    /// of only passthrough scripts is <see cref="StartDeploymentOutcome.Accepted"/> with no advisory.</summary>
    [Fact]
    public void StartDeployment_passthrough_scripts_do_not_count()
    {
        var dbFactory = NewInMemoryDbFactory();
        using (var db = dbFactory.CreateDbContext())
        {
            for (var i = 0; i < 5; i++)
            {
                db.Scripts.Add(new Configuration.Entities.Script
                {
                    ScriptId = $"mirror-{i}",
                    Name = $"mirror-{i}",
                    SourceCode = $"return ctx.GetTag(\"tag-{i}\").Value;",   // passthrough mirror — costs ~nothing
                    SourceHash = $"mhash-{i}",
                });
            }
            db.SaveChanges();
        }

        var coordinator = CreateTestProbe("coord");
        var actor = Sys.ActorOf(AdminOperationsActor.Props(dbFactory, coordinator.Ref, Enumerable.Empty<IDriverProbe>()));

        actor.Tell(new StartDeployment("joe", CorrelationId.NewId()));

        coordinator.ExpectMsg<DispatchDeployment>(TimeSpan.FromSeconds(3));

        var reply = ExpectMsg<StartDeploymentResult>(TimeSpan.FromSeconds(3));
        reply.Outcome.ShouldBe(StartDeploymentOutcome.Accepted);
        // No compiled scripts → no advisory emitted.
        (reply.Message is null || !reply.Message.Contains("will compile")).ShouldBeTrue();
    }

    /// <summary>Verifies the advisory counts DISTINCT non-passthrough sources: many rows sharing one
    /// identical source collapse to a single compiled unit (the compile cache keys on source), so the
    /// advisory reports 1 — not the row count.</summary>
    [Fact]
    public void StartDeployment_duplicate_sources_collapse_to_one_compiled_unit()
    {
        const string identical = "return (int)ctx.GetTag(\"a\").Value + 1;";
        var dbFactory = NewInMemoryDbFactory();
        using (var db = dbFactory.CreateDbContext())
        {
            for (var i = 0; i < 7; i++)
            {
                db.Scripts.Add(new Configuration.Entities.Script
                {
                    ScriptId = $"dup-{i}",
                    Name = $"dup-{i}",
                    SourceCode = identical,                 // same source across all rows
                    SourceHash = "dup-hash",
                });
            }
            db.SaveChanges();
        }

        var coordinator = CreateTestProbe("coord");
        var actor = Sys.ActorOf(AdminOperationsActor.Props(dbFactory, coordinator.Ref, Enumerable.Empty<IDriverProbe>()));

        actor.Tell(new StartDeployment("joe", CorrelationId.NewId()));

        coordinator.ExpectMsg<DispatchDeployment>(TimeSpan.FromSeconds(3));

        var reply = ExpectMsg<StartDeploymentResult>(TimeSpan.FromSeconds(3));
        reply.Outcome.ShouldBe(StartDeploymentOutcome.Accepted);
        reply.Message.ShouldNotBeNull();
        reply.Message.ShouldContain("will compile");
        reply.Message.ShouldContain("1 script(s) will compile");
    }

    /// <summary>Verifies that starting a deployment is refused when another is in flight.</summary>
    [Fact]
    public void StartDeployment_refuses_when_another_is_in_flight()
    {
        var dbFactory = NewInMemoryDbFactory();
        // Seed an in-flight Deployment.
        using (var db = dbFactory.CreateDbContext())
        {
            db.Deployments.Add(new Configuration.Entities.Deployment
            {
                RevisionHash = new string('a', 64),
                Status = DeploymentStatus.Dispatching,
                CreatedBy = "earlier",
            });
            db.SaveChanges();
        }

        var coordinator = CreateTestProbe("coord");
        var actor = Sys.ActorOf(AdminOperationsActor.Props(dbFactory, coordinator.Ref, Enumerable.Empty<IDriverProbe>()));

        actor.Tell(new StartDeployment("joe", CorrelationId.NewId()));

        coordinator.ExpectNoMsg(TimeSpan.FromMilliseconds(500));
        var reply = ExpectMsg<StartDeploymentResult>(TimeSpan.FromSeconds(3));
        reply.Outcome.ShouldBe(StartDeploymentOutcome.AnotherDeploymentInFlight);
        reply.DeploymentId.ShouldNotBeNull();
    }
}