using Akka.Actor;
using Akka.TestKit.Xunit2;
using Microsoft.Extensions.Logging.Abstractions;
using ZB.MOM.WW.ScadaBridge.Commons.Messages.Deployment;
using ZB.MOM.WW.ScadaBridge.Commons.Messages.InboundApi;
using ZB.MOM.WW.ScadaBridge.Commons.Messages.Instance;
using ZB.MOM.WW.ScadaBridge.Commons.Types.Audit;
using ZB.MOM.WW.ScadaBridge.Commons.Types.Flattening;
using ZB.MOM.WW.ScadaBridge.SiteRuntime.Actors;
using ZB.MOM.WW.ScadaBridge.SiteRuntime.Persistence;
using ZB.MOM.WW.ScadaBridge.SiteRuntime.Scripts;
using ZB.MOM.WW.ScadaBridge.TestSupport;
using System.Text.Json;

namespace ZB.MOM.WW.ScadaBridge.SiteRuntime.Tests.Actors;

/// <summary>
/// Flow Debugger design 2026-09-05 §5.2/§5.4: the Deployment Manager's inbound-API route
/// handlers forward the <c>Trace</c> flag and map the routed run's <c>ExecutionId</c> and
/// inline <c>ScriptTrace</c> events onto the <see cref="RouteToCallResponse"/>. Fixture copied
/// from <c>DeploymentManagerActorTests</c> (real Instance/Script actors end-to-end).
/// </summary>
public class DeploymentManagerRouteTraceTests : TestKit, IDisposable
{
    private readonly SiteStorageService _storage;
    private readonly ScriptCompilationService _compilationService;
    private readonly SharedScriptLibrary _sharedScriptLibrary;
    private readonly TestLocalDb _localDb;

    /// <summary>Creates a temporary LocalDb-backed site storage and the script services the actors need.</summary>
    public DeploymentManagerRouteTraceTests()
    {
        _localDb = TestLocalDb.CreateTemp("dm-route-trace-test");
        _storage = new SiteStorageService(_localDb.Db, NullLogger<SiteStorageService>.Instance);
        _storage.InitializeAsync().GetAwaiter().GetResult();
        _compilationService = new ScriptCompilationService(NullLogger<ScriptCompilationService>.Instance);
        _sharedScriptLibrary = new SharedScriptLibrary(_compilationService, NullLogger<SharedScriptLibrary>.Instance);
    }

    /// <inheritdoc />
    void IDisposable.Dispose()
    {
        Shutdown();
        var path = _localDb.Path;
        _localDb.Dispose();
        TestLocalDb.DeleteFiles(path);
    }

    private IActorRef CreateDeploymentManager() =>
        ActorOf(Props.Create(() => new DeploymentManagerActor(
            _storage, _compilationService, _sharedScriptLibrary, null, new SiteRuntimeOptions(),
            NullLogger<DeploymentManagerActor>.Instance,
            dclManager: null, healthCollector: null, serviceProvider: null, loggerFactory: null, configFetcher: null)));

    private static string ConfigJson(string instance) => JsonSerializer.Serialize(new FlattenedConfiguration
    {
        InstanceUniqueName = instance,
        Attributes = [new ResolvedAttribute { CanonicalName = "Mode", Value = "Auto", DataType = "String" }],
        Scripts = [new ResolvedScript { CanonicalName = "DoWork", Code = "await Instance.SetAttribute(\"Mode\", \"Manual\"); return 7;" }],
    });

    private async Task<IActorRef> DeployedManager(string instance)
    {
        var actor = CreateDeploymentManager();
        await Task.Delay(500);
        actor.Tell(new DeployInstanceCommand("dep", instance, "sha256:x", ConfigJson(instance), "admin", DateTimeOffset.UtcNow));
        ExpectMsg<DeploymentStatusResponse>(TimeSpan.FromSeconds(5));
        await Task.Delay(1000);
        return actor;
    }

    /// <summary>Verifies that a traced route call returns the child execution id and the inline trace events.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [Fact]
    public async Task RouteCall_WithTrace_ReturnsChildExecutionId_AndInlineTraceEvents()
    {
        var actor = await DeployedManager("TracedPump");
        var parent = Guid.NewGuid();

        actor.Tell(new RouteToCallRequest("rc-1", "TracedPump", "DoWork", null, DateTimeOffset.UtcNow,
            ParentExecutionId: parent, Trace: true));

        var response = ExpectMsg<RouteToCallResponse>(TimeSpan.FromSeconds(10));
        Assert.True(response.Success, response.ErrorMessage);
        Assert.Equal(7, Convert.ToInt32(response.ReturnValue));
        Assert.NotNull(response.ChildExecutionId);
        Assert.NotNull(response.TraceEvents);

        var rows = response.TraceEvents!.Select(e => e.AsRow()).ToList();
        // The script wrote an attribute (AttributeWrite) and the run itself (ScriptRun) — both
        // stamped with the routed run's id and parented to the inbound request.
        Assert.Contains(rows, r => r.Kind == Commons.Types.Enums.AuditKind.AttributeWrite);
        var run = Assert.Single(rows, r => r.Kind == Commons.Types.Enums.AuditKind.ScriptRun);
        Assert.Equal(response.ChildExecutionId, run.ExecutionId);
        Assert.Equal(parent, run.ParentExecutionId);
        Assert.All(rows, r => Assert.Equal(response.ChildExecutionId, r.ExecutionId));
    }

    /// <summary>Verifies that an untraced route call returns the execution id but no trace events.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [Fact]
    public async Task RouteCall_WithoutTrace_ReturnsExecutionId_ButNoTraceEvents()
    {
        var actor = await DeployedManager("PlainPump");

        actor.Tell(new RouteToCallRequest("rc-2", "PlainPump", "DoWork", null, DateTimeOffset.UtcNow));

        var response = ExpectMsg<RouteToCallResponse>(TimeSpan.FromSeconds(10));
        Assert.True(response.Success, response.ErrorMessage);
        Assert.NotNull(response.ChildExecutionId);
        Assert.Null(response.TraceEvents);
    }

    /// <summary>Verifies that routing a set-attributes request forwards the trace flag on the command.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [Fact]
    public async Task RouteSetAttributes_ForwardsTraceFlag_OnTheCommand()
    {
        var actor = await DeployedManager("SetPump");
        var parent = Guid.NewGuid();

        actor.Tell(new RouteToSetAttributesRequest("rs-1", "SetPump",
            new Dictionary<string, string> { ["Mode"] = "Hand" }, DateTimeOffset.UtcNow,
            ParentExecutionId: parent, Trace: true));

        var response = ExpectMsg<RouteToSetAttributesResponse>(TimeSpan.FromSeconds(10));
        Assert.True(response.Success, response.ErrorMessage);

        // The write landed with the trace stamp: reading it back through a debug snapshot is
        // heavier than needed — the InstanceActorTraceArmTests pin the publish; here we assert
        // the routed write succeeded end-to-end with the additive flag set, i.e. the command
        // shape the handler builds is accepted by the Instance Actor.
        actor.Tell(new RouteToGetAttributesRequest("rg-1", "SetPump", ["Mode"], DateTimeOffset.UtcNow));
        var read = ExpectMsg<RouteToGetAttributesResponse>(TimeSpan.FromSeconds(10));
        Assert.Equal("Hand", read.Values["Mode"]?.ToString());
    }
}