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>VerifyAuditChain</c> management command (ScadaBridge#41): role gate, month
/// parsing, site-scope refusal, and the verification result reaching the wire with its
/// enums as names.
/// </summary>
public class VerifyAuditChainCommandTests : TestKit
{
    private readonly IAuditLogHashChain _chain = Substitute.For<IAuditLogHashChain>();

    private IActorRef CreateActor()
    {
        var services = new ServiceCollection().AddTestConfigurationTransaction();
        services.AddScoped(_ => _chain);
        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"));

    /// <summary>A Viewer gets the verifier's result for the requested month, enums as names.</summary>
    [Fact]
    public void Viewer_GetsVerificationResult_ForTheRequestedMonth()
    {
        var brk = new AuditChainBreak("2026-05", 7, Guid.Parse("11111111-2222-3333-4444-555555555555"),
            AuditChainBreakKind.HashMismatch, "edited");
        _chain.VerifyMonthAsync(Arg.Any<DateTime>(), Arg.Any<CancellationToken>())
            .Returns(new AuditChainVerificationResult("2026-05", AuditChainStatus.Broken, 6, 0, null, 43, 2, brk));

        CreateActor().Tell(Envelope(new VerifyAuditChainCommand("2026-05"), [], "Viewer"));

        var response = ExpectMsg<ManagementSuccess>(TimeSpan.FromSeconds(5));
        using var json = JsonDocument.Parse(response.JsonData);
        Assert.Equal("Broken", json.RootElement.GetProperty("status").GetString());
        Assert.Equal("HashMismatch", json.RootElement.GetProperty("firstBreak").GetProperty("kind").GetString());
        Assert.Equal(7, json.RootElement.GetProperty("firstBreak").GetProperty("chainSeq").GetInt64());
        _chain.Received(1).VerifyMonthAsync(
            new DateTime(2026, 5, 1, 0, 0, 0, DateTimeKind.Utc), Arg.Any<CancellationToken>());
    }

    /// <summary>A Designer/Deployer without an OperationalAudit role is refused.</summary>
    [Fact]
    public void NonAuditRole_IsUnauthorized()
    {
        CreateActor().Tell(Envelope(new VerifyAuditChainCommand("2026-05"), [], "Designer", "Deployer"));

        ExpectMsg<ManagementUnauthorized>(TimeSpan.FromSeconds(5));
        _chain.DidNotReceiveWithAnyArgs().VerifyMonthAsync(default, default);
    }

    /// <summary>A site-scoped Viewer is refused: the chain spans every site.</summary>
    [Fact]
    public void SiteScopedViewer_IsRefused()
    {
        CreateActor().Tell(Envelope(new VerifyAuditChainCommand("2026-05"), ["3"], "Viewer"));

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

    /// <summary>A malformed month is a caller error, not an internal fault.</summary>
    [Fact]
    public void MalformedMonth_IsInvalidArgument()
    {
        CreateActor().Tell(Envelope(new VerifyAuditChainCommand("2026-13"), [], "Administrator"));

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

    /// <summary>A verification that cannot get the chain lock surfaces as CHAIN_BUSY.</summary>
    [Fact]
    public void BusyChain_IsChainBusy()
    {
        _chain.VerifyMonthAsync(Arg.Any<DateTime>(), Arg.Any<CancellationToken>())
            .Returns<Task<AuditChainVerificationResult>>(_ => throw new TimeoutException("busy"));

        CreateActor().Tell(Envelope(new VerifyAuditChainCommand("2026-05"), [], "Administrator"));

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

    /// <summary>Verification runs under the long-running Ask timeout, not the 30 s default.</summary>
    [Fact]
    public void VerifyAuditChain_UsesLongRunningAskTimeout()
    {
        Assert.Equal(TimeSpan.FromMinutes(5),
            ManagementEndpoints.ResolveAskTimeout(new ManagementServiceOptions(), typeof(VerifyAuditChainCommand)));
    }
}