using System.Text.Json;
using Akka.Actor;
using Akka.TestKit.Xunit2;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging.Abstractions;
using NSubstitute;
using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Repositories;
using ZB.MOM.WW.ScadaBridge.Commons.Messages.Management;
using ZB.MOM.WW.ScadaBridge.Commons.Types.Audit;

namespace ZB.MOM.WW.ScadaBridge.ManagementService.Tests;

/// <summary>
/// The <c>ListAuditArchives</c> / <c>VerifyAuditArchive</c> management commands
/// (ScadaBridge#42): role gate, site-scope refusal, an unconfigured archive directory, bad
/// names, and the results reaching the wire with enums as names.
/// </summary>
public class AuditArchiveCommandTests : TestKit
{
    private const string Name = "auditlog-2025-10-20261109T120000123Z";

    private readonly IAuditLogArchive _archive = Substitute.For<IAuditLogArchive>();

    /// <summary>Configures the archive substitute as a configured, enabled archive.</summary>
    public AuditArchiveCommandTests()
    {
        _archive.IsConfigured.Returns(true);
        _archive.IsEnabled.Returns(true);
    }

    private IActorRef CreateActor(bool registerArchive = true)
    {
        var services = new ServiceCollection().AddTestConfigurationTransaction();
        if (registerArchive)
        {
            services.AddScoped(_ => _archive);
        }

        return Sys.ActorOf(Props.Create(() => new ManagementActor(
            services.BuildServiceProvider(), NullLogger<ManagementActor>.Instance)));
    }

    private static ManagementEnvelope Envelope(object command, string[] sites, params string[] roles) =>
        new(new AuthenticatedUser("u", "U", roles, sites), command, Guid.NewGuid().ToString("N"));

    private static AuditArchiveManifest Manifest() => new(
        1, Name, new DateTime(2025, 10, 1, 0, 0, 0, DateTimeKind.Utc), "2025-10",
        new DateTime(2026, 11, 9, 12, 0, 0, DateTimeKind.Utc), AuditArchiveStatus.Purged,
        new DateTime(2026, 11, 9, 12, 0, 1, DateTimeKind.Utc), 10, 9, 1, null, null,
        Name + ".parquet", "ab", 1234, Name + ".tombstones.parquet", "cd", 0,
        [new AuditArchiveChainState("2025-10", 9, new string('0', 64), null, null, 0)]);

    /// <summary>A Viewer lists the archives; status renders as a name.</summary>
    [Fact]
    public void Viewer_ListsArchives()
    {
        _archive.ListAsync(Arg.Any<CancellationToken>()).Returns([Manifest()]);

        CreateActor().Tell(Envelope(new ListAuditArchivesCommand(), [], "Viewer"));

        var response = ExpectMsg<ManagementSuccess>(TimeSpan.FromSeconds(5));
        using var json = JsonDocument.Parse(response.JsonData);
        Assert.True(json.RootElement.GetProperty("enabled").GetBoolean());
        var archive = json.RootElement.GetProperty("archives")[0];
        Assert.Equal(Name, archive.GetProperty("name").GetString());
        Assert.Equal("Purged", archive.GetProperty("status").GetString());
    }

    /// <summary>Verification results reach the wire with the anchor and chain status as names.</summary>
    [Fact]
    public void Viewer_GetsVerificationResult()
    {
        var chain = new AuditChainVerificationResult("2025-10", AuditChainStatus.Intact, 9, 0, null, 9, 1, null);
        _archive.VerifyAsync(Name, Arg.Any<CancellationToken>()).Returns(new AuditArchiveVerificationResult(
            Name, "2025-10", AuditArchiveStatus.Purged, true, true, null, 10,
            [new AuditArchiveChainVerification(chain, AuditArchiveAnchorStatus.Matches, "ends at the anchor")]));

        CreateActor().Tell(Envelope(new VerifyAuditArchiveCommand(Name), [], "Viewer"));

        var response = ExpectMsg<ManagementSuccess>(TimeSpan.FromSeconds(5));
        using var json = JsonDocument.Parse(response.JsonData);
        Assert.True(json.RootElement.GetProperty("verified").GetBoolean());
        var c = json.RootElement.GetProperty("chains")[0];
        Assert.Equal("Matches", c.GetProperty("anchor").GetString());
        Assert.Equal("Intact", c.GetProperty("chain").GetProperty("status").GetString());
    }

    /// <summary>Designer/Deployer without an OperationalAudit role are refused both commands.</summary>
    [Fact]
    public void NonAuditRole_IsUnauthorized()
    {
        var actor = CreateActor();
        actor.Tell(Envelope(new ListAuditArchivesCommand(), [], "Designer", "Deployer"));
        ExpectMsg<ManagementUnauthorized>(TimeSpan.FromSeconds(5));
        actor.Tell(Envelope(new VerifyAuditArchiveCommand(Name), [], "Designer", "Deployer"));
        ExpectMsg<ManagementUnauthorized>(TimeSpan.FromSeconds(5));
        _archive.DidNotReceiveWithAnyArgs().ListAsync(default);
        _archive.DidNotReceiveWithAnyArgs().VerifyAsync(default!, default);
    }

    /// <summary>A site-scoped Viewer is refused: an archive holds every site's rows.</summary>
    [Fact]
    public void SiteScopedViewer_IsRefused()
    {
        CreateActor().Tell(Envelope(new VerifyAuditArchiveCommand(Name), ["3"], "Viewer"));

        var response = ExpectMsg<ManagementUnauthorized>(TimeSpan.FromSeconds(5));
        Assert.Contains("every site", response.Message);
        _archive.DidNotReceiveWithAnyArgs().VerifyAsync(default!, default);
    }

    /// <summary>No archive directory configured is an explicit error code, not an empty list.</summary>
    [Fact]
    public void UnconfiguredArchive_IsArchiveNotConfigured()
    {
        _archive.IsConfigured.Returns(false);

        CreateActor().Tell(Envelope(new ListAuditArchivesCommand(), [], "Administrator"));

        var response = ExpectMsg<ManagementError>(TimeSpan.FromSeconds(5));
        Assert.Equal("ARCHIVE_NOT_CONFIGURED", response.ErrorCode);
    }

    /// <summary>A malformed name is INVALID_ARGUMENT; an unknown one is NOT_FOUND.</summary>
    [Fact]
    public void BadNames_MapToCallerErrors()
    {
        _archive.VerifyAsync("../etc", Arg.Any<CancellationToken>())
            .Returns<Task<AuditArchiveVerificationResult>>(_ => throw new ArgumentException("not an archive name"));
        _archive.VerifyAsync(Name, Arg.Any<CancellationToken>())
            .Returns<Task<AuditArchiveVerificationResult>>(_ => throw new FileNotFoundException("no archive"));

        var actor = CreateActor();
        actor.Tell(Envelope(new VerifyAuditArchiveCommand("../etc"), [], "Administrator"));
        Assert.Equal("INVALID_ARGUMENT", ExpectMsg<ManagementError>(TimeSpan.FromSeconds(5)).ErrorCode);
        actor.Tell(Envelope(new VerifyAuditArchiveCommand(Name), [], "Administrator"));
        Assert.Equal("NOT_FOUND", ExpectMsg<ManagementError>(TimeSpan.FromSeconds(5)).ErrorCode);
    }

    /// <summary>Archive verification runs under the long-running Ask timeout.</summary>
    [Fact]
    public void VerifyAuditArchive_UsesLongRunningAskTimeout()
    {
        Assert.Equal(TimeSpan.FromMinutes(5),
            ManagementEndpoints.ResolveAskTimeout(new ManagementServiceOptions(), typeof(VerifyAuditArchiveCommand)));
    }
}