using Akka.Actor;
using Microsoft.AspNetCore.Mvc.Testing;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using ScadaLink.ConfigurationDatabase;
using ScadaLink.Host;
using ScadaLink.Host.Actors;

namespace ScadaLink.Host.Tests;

[CollectionDefinition("ActorSystem")]
public class ActorSystemCollection : ICollectionFixture<object> { }

/// <summary>
/// Verifies that all expected Central-role actors are created at the correct paths
/// when AkkaHostedService starts.
/// </summary>
[Collection("ActorSystem")]
public class CentralActorPathTests : IAsyncLifetime
{
    private WebApplicationFactory<Program>? _factory;
    private ActorSystem? _actorSystem;
    private string? _previousEnv;

    public Task InitializeAsync()
    {
        _previousEnv = Environment.GetEnvironmentVariable("DOTNET_ENVIRONMENT");
        Environment.SetEnvironmentVariable("DOTNET_ENVIRONMENT", "Central");

        _factory = new WebApplicationFactory<Program>()
            .WithWebHostBuilder(builder =>
            {
                builder.ConfigureAppConfiguration((_, config) =>
                {
                    config.AddInMemoryCollection(new Dictionary<string, string?>
                    {
                        ["ScadaLink:Node:NodeHostname"] = "localhost",
                        ["ScadaLink:Node:RemotingPort"] = "0",
                        ["ScadaLink:Cluster:SeedNodes:0"] = "akka.tcp://scadalink@localhost:25510",
                        ["ScadaLink:Cluster:SeedNodes:1"] = "akka.tcp://scadalink@localhost:25520",
                        ["ScadaLink:Cluster:MinNrOfMembers"] = "1",
                        ["ScadaLink:Database:SkipMigrations"] = "true",
                        ["ScadaLink:Security:JwtSigningKey"] = "test-signing-key-must-be-at-least-32-chars-long!",
                        ["ScadaLink:Security:LdapServer"] = "localhost",
                        ["ScadaLink:Security:LdapPort"] = "3893",
                        ["ScadaLink:Security:LdapUseTls"] = "false",
                        ["ScadaLink:Security:AllowInsecureLdap"] = "true",
                        ["ScadaLink:Security:LdapSearchBase"] = "dc=scadalink,dc=local",
                    });
                });
                builder.UseSetting("ScadaLink:Node:Role", "Central");
                builder.UseSetting("ScadaLink:Database:SkipMigrations", "true");
                builder.ConfigureServices(services =>
                {
                    // Replace SQL Server with in-memory database
                    var descriptorsToRemove = services
                        .Where(d =>
                            d.ServiceType == typeof(DbContextOptions<ScadaLinkDbContext>) ||
                            d.ServiceType == typeof(DbContextOptions) ||
                            d.ServiceType == typeof(ScadaLinkDbContext) ||
                            d.ServiceType.FullName?.Contains("EntityFrameworkCore") == true)
                        .ToList();
                    foreach (var d in descriptorsToRemove)
                        services.Remove(d);

                    services.AddDbContext<ScadaLinkDbContext>(options =>
                        options.UseInMemoryDatabase($"ActorPathTests_{Guid.NewGuid()}"));
                });
            });

        // CreateClient triggers host startup including AkkaHostedService
        _ = _factory.CreateClient();

        var akkaService = _factory.Services.GetRequiredService<AkkaHostedService>();
        _actorSystem = akkaService.ActorSystem;
        return Task.CompletedTask;
    }

    public async Task DisposeAsync()
    {
        _factory?.Dispose();
        Environment.SetEnvironmentVariable("DOTNET_ENVIRONMENT", _previousEnv);
        await Task.CompletedTask;
    }

    [Fact]
    public async Task CentralActors_DeadLetterMonitor_Exists()
        => await AssertActorExists("/user/dead-letter-monitor");

    [Fact]
    public async Task CentralActors_CentralCommunication_Exists()
        => await AssertActorExists("/user/central-communication");

    [Fact]
    public async Task CentralActors_Management_Exists()
        => await AssertActorExists("/user/management");

    private async Task AssertActorExists(string path)
    {
        Assert.NotNull(_actorSystem);
        var selection = _actorSystem!.ActorSelection(path);
        var identity = await selection.Ask<ActorIdentity>(
            new Identify(path), TimeSpan.FromSeconds(5));
        Assert.NotNull(identity.Subject);
    }
}

/// <summary>
/// Verifies that all expected Site-role actors are created at the correct paths
/// when AkkaHostedService starts.
/// </summary>
[Collection("ActorSystem")]
public class SiteActorPathTests : IAsyncLifetime
{
    private IHost? _host;
    private ActorSystem? _actorSystem;
    private string _tempDbPath = null!;

    public async Task InitializeAsync()
    {
        _tempDbPath = Path.Combine(Path.GetTempPath(), $"scadalink_actor_test_{Guid.NewGuid()}.db");

        var builder = Microsoft.Extensions.Hosting.Host.CreateDefaultBuilder();
        builder.ConfigureAppConfiguration(config =>
        {
            config.Sources.Clear();
            config.AddInMemoryCollection(new Dictionary<string, string?>
            {
                ["ScadaLink:Node:Role"] = "Site",
                ["ScadaLink:Node:NodeHostname"] = "localhost",
                ["ScadaLink:Node:SiteId"] = "TestSite",
                ["ScadaLink:Node:RemotingPort"] = "0",
                ["ScadaLink:Cluster:SeedNodes:0"] = "akka.tcp://scadalink@localhost:25510",
                ["ScadaLink:Cluster:SeedNodes:1"] = "akka.tcp://scadalink@localhost:25520",
                ["ScadaLink:Cluster:MinNrOfMembers"] = "1",
                ["ScadaLink:Database:SiteDbPath"] = _tempDbPath,
                // Configure a dummy central contact point to trigger ClusterClient creation
                ["ScadaLink:Communication:CentralContactPoints:0"] = "akka.tcp://scadalink@localhost:25510",
            });
        });
        builder.ConfigureServices((context, services) =>
        {
            SiteServiceRegistration.Configure(services, context.Configuration);
        });

        _host = builder.Build();
        await _host.StartAsync();

        var akkaService = _host.Services.GetRequiredService<AkkaHostedService>();
        _actorSystem = akkaService.ActorSystem;
    }

    public async Task DisposeAsync()
    {
        if (_host != null)
        {
            await _host.StopAsync();
            _host.Dispose();
        }
        try { File.Delete(_tempDbPath); } catch { /* best effort */ }
    }

    [Fact]
    public async Task SiteActors_DeadLetterMonitor_Exists()
        => await AssertActorExists("/user/dead-letter-monitor");

    [Fact]
    public async Task SiteActors_DclManager_Exists()
        => await AssertActorExists("/user/dcl-manager");

    [Fact]
    public async Task SiteActors_DeploymentManagerSingleton_Exists()
        => await AssertActorExists("/user/deployment-manager-singleton");

    [Fact]
    public async Task SiteActors_DeploymentManagerProxy_Exists()
        => await AssertActorExists("/user/deployment-manager-proxy");

    [Fact]
    public async Task SiteActors_SiteCommunication_Exists()
        => await AssertActorExists("/user/site-communication");

    [Fact]
    public async Task SiteActors_CentralClusterClient_Exists()
        => await AssertActorExists("/user/central-cluster-client");

    private async Task AssertActorExists(string path)
    {
        Assert.NotNull(_actorSystem);
        var selection = _actorSystem!.ActorSelection(path);
        var identity = await selection.Ask<ActorIdentity>(
            new Identify(path), TimeSpan.FromSeconds(5));
        Assert.NotNull(identity.Subject);
    }
}
