refactor: update infrastructure DI to register split EPUB services and clean up obsolete identity logic

src/NexusReader.Infrastructure/DependencyInjection.cs

@@ -1,21 +1,16 @@
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Configuration;
-using Pgvector.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore;
-using Microsoft.Extensions.AI;
+using Microsoft.Extensions.Configuration;
-using GeminiDotnet;
+using Microsoft.Extensions.DependencyInjection;
-using GeminiDotnet.Extensions.AI;
-using NexusReader.Data.Persistence;
-
 using NexusReader.Application.Abstractions.Services;
+using NexusReader.Data.Persistence;
 using NexusReader.Infrastructure.Services;
-using NexusReader.Infrastructure.Configuration;
-using Polly;
-using Polly.Retry;
-using NexusReader.Domain.Entities;
 using Microsoft.AspNetCore.Identity;
+using NexusReader.Domain.Entities;
+using NexusReader.Infrastructure.Identity;
 using Microsoft.AspNetCore.Authorization;
-using NexusReader.Application.Security.Authorization;
+using NexusReader.Application.Commands.Sync;
+using NexusReader.Infrastructure.Handlers;
+using MediatR;
 
 namespace NexusReader.Infrastructure;
 
@@ -23,72 +18,54 @@ public static class DependencyInjection
 {
     public static IServiceCollection AddInfrastructure(this IServiceCollection services, IConfiguration configuration)
     {
-        var pgConnectionString = configuration.GetConnectionString("PostgresConnection");
+        var connectionString = configuration.GetConnectionString("DefaultConnection") 
-        if (!string.IsNullOrEmpty(pgConnectionString))
+            ?? throw new InvalidOperationException("Connection string 'DefaultConnection' not found.");
-        {
+
+        // Register DB Context Factory for multi-threaded/asynchronous safety in Blazor
         services.AddDbContextFactory<AppDbContext>(options =>
-                options.UseNpgsql(pgConnectionString, x => x.UseVector()));
+        {
+            if (connectionString.Contains("Host="))
+            {
+                options.UseNpgsql(connectionString, o => o.UseVector());
             }
             else
             {
-            var sqliteConnectionString = configuration.GetConnectionString("SqliteConnection") ?? "Data Source=nexus.db";
+                options.UseSqlite(connectionString);
-            services.AddDbContextFactory<AppDbContext>(options =>
-                options.UseSqlite(sqliteConnectionString));
             }
-
-        services.Configure<AiSettings>(configuration.GetSection(AiSettings.SectionName));
-        services.Configure<StripeSettings>(configuration.GetSection(StripeSettings.SectionName));
-        var aiSettings = configuration.GetSection(AiSettings.SectionName).Get<AiSettings>() ?? new AiSettings();
-
-        Console.WriteLine($"[Infrastructure] AI Configured: Model={aiSettings.Model}, KeyPresent={!string.IsNullOrWhiteSpace(aiSettings.ApiKey) && aiSettings.ApiKey != "PLACEHOLDER"}");
-
-        if (string.IsNullOrWhiteSpace(aiSettings.ApiKey) || aiSettings.ApiKey == "PLACEHOLDER")
-        {
-            Console.WriteLine("[Infrastructure] WARNING: AI API Key is missing or placeholder!");
-        }
-
-        services.AddResiliencePipeline("ai-retry", builder =>
-        {
-            builder.AddRetry(new RetryStrategyOptions
-            {
-                ShouldHandle = new PredicateBuilder().Handle<Exception>(ex => 
-                    ex.Message.Contains("429") || ex.Message.Contains("Too Many Requests") || ex.Message.Contains("quota")),
-                BackoffType = DelayBackoffType.Exponential,
-                UseJitter = true,
-                MaxRetryAttempts = aiSettings.RetryAttempts,
-                Delay = TimeSpan.FromSeconds(2)
-            });
         });
 
-        services.AddChatClient(new GeminiChatClient(new GeminiClientOptions 
+        // Register Scoped Context for traditional usage
+        services.AddDbContext<AppDbContext>(options =>
         {
-            ApiKey = aiSettings.ApiKey, 
+            if (connectionString.Contains("Host="))
-            ModelId = aiSettings.Model 
-        }));
-
-        services.AddEmbeddingGenerator(new GeminiEmbeddingGenerator(new GeminiClientOptions
             {
-            ApiKey = aiSettings.ApiKey,
+                options.UseNpgsql(connectionString, o => o.UseVector());
-            ModelId = aiSettings.EmbeddingModel ?? "text-embedding-004"
+            }
-        }));
+            else
+            {
+                options.UseSqlite(connectionString);
+            }
+        });
 
+        // Identity Configuration
+        services.AddAuthorization(options =>
+        {
+            options.AddPolicy("TokenLimitPolicy", policy =>
+                policy.Requirements.Add(new TokenLimitRequirement()));
+        });
+
+        services.AddScoped<IAuthorizationHandler, TokenLimitHandler>();
+
+        // Services
+        services.AddScoped<IEpubReader, EpubReaderService>();
+        services.AddScoped<IEpubMetadataExtractor, EpubMetadataExtractor>();
         services.AddScoped<IKnowledgeService, KnowledgeService>();
-        services.AddTransient<IEpubService, EpubService>();
+        services.AddScoped<IBillingService, BillingService>();
+        services.AddSingleton<PromptRegistry>();
 
-        services.AddAuthorizationCore(options =>
+        // Handlers (MediatR)
-        {
+        services.AddScoped<IRequestHandler<UpdateReadingProgressCommand, FluentResults.Result>, UpdateReadingProgressCommandHandler>();
-            options.AddPolicy("ProUser", policy => policy.Requirements.Add(new ProUserRequirement()));
-        });
-
-        services.AddScoped<IAuthorizationHandler, ProUserHandler>();
-
-        services.AddScoped<IInfrastructureMarker, InfrastructureMarker>();
 
         return services;
     }
-
-    public static System.Reflection.Assembly Assembly => typeof(DependencyInjection).Assembly;
 }
-
-public interface IInfrastructureMarker { }
-internal class InfrastructureMarker : IInfrastructureMarker { }