Hy2026/backend/Infrastructure/DependencyInjection.cs

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using SurrealDb.Net;
using TarninaHub.Application.Abstractions;
using TarninaHub.Application.Matchmaking;
using TarninaHub.Infrastructure.Auth;
using TarninaHub.Infrastructure.Events;
using TarninaHub.Infrastructure.Llm;
using TarninaHub.Infrastructure.Persistence;
using TarninaHub.Infrastructure.Settings;

namespace TarninaHub.Infrastructure;

public static class DependencyInjection
{
    public static IServiceCollection AddInfrastructure(
        this IServiceCollection services,
        IConfiguration configuration)
    {
        services.Configure<SurrealDbSettings>(configuration.GetSection("SurrealDb"));
        services.Configure<AuthSettings>(configuration.GetSection("Auth"));

        var llmSettings = configuration.GetSection("Llm").Get<LlmSettings>() ?? new LlmSettings();
        services.Configure<LlmSettings>(configuration.GetSection("Llm"));
        services.AddSingleton<ILlmRequestLimiter>(
            new InMemoryLlmRequestLimiter(llmSettings.MaxRequestsPerMinute));

        if (llmSettings.IsConfigured)
        {
            services.AddHttpClient<OpenAiCompatibleLlmProvider>(
                client => client.Timeout = TimeSpan.FromSeconds(llmSettings.TimeoutSeconds));
            services.AddSingleton<ILlmProvider>(
                provider => provider.GetRequiredService<OpenAiCompatibleLlmProvider>());
        }
        else
        {
            services.AddSingleton<ILlmProvider, NullLlmProvider>();
        }

        var settings = configuration.GetSection("SurrealDb").Get<SurrealDbSettings>()
            ?? new SurrealDbSettings();

        var options = new SurrealDbOptions
        {
            Endpoint = SurrealDbEndpoint.Build(settings),
            Namespace = settings.Namespace,
            Database = settings.Database,
        };

        if (string.IsNullOrWhiteSpace(settings.RemoteUrl))
        {
            // Embedded RocksDB, persisted next to the running app (./data), never in memory.
            var dataDirectory = Path.Combine(AppContext.BaseDirectory, settings.DataDirectory);
            Directory.CreateDirectory(dataDirectory);

            services
                .AddSurreal(options, ServiceLifetime.Singleton)
                .AddRocksDbProvider();
        }
        else
        {
            // Remote SurrealDB server on its own dedicated port (used for sync with the frontend).
            options.Username = settings.Username;
            options.Password = settings.Password;

            services.AddSurreal(options, ServiceLifetime.Singleton);
        }

        services.AddSingleton<IStorageService, StorageService>();
        services.AddSingleton<IMigrationRunner, MigrationRunner>();
        services.AddSingleton<ITokenService, TokenService>();
        services.AddSingleton<IUserService, UserService>();
        services.AddSingleton<IConsentService, ConsentService>();
        services.AddSingleton<IAuditLogService, AuditLogService>();
        services.AddSingleton<ISubmissionEventPublisher, LoggingSubmissionEventPublisher>();
        services.AddSingleton<ISubmissionService, SubmissionService>();
        services.AddSingleton<IChallengeService, ChallengeService>();
        services.AddSingleton<IKnowledgeItemService, KnowledgeItemService>();
        services.AddSingleton<IInnovationService, InnovationService>();
        services.AddSingleton<ITrendService, TrendService>();
        services.AddSingleton<IEmbeddingProvider, HashingEmbeddingProvider>();
        services.AddSingleton<IMatchmakingService, MatchmakingService>();

        return services;
    }
}