using System;
using FinlyticCore.Database;
using FinlyticCore.Services;
using FinlyticEngine.Database;
using FinlyticEngine.Services.Ai;
using FinlyticEngine.Services.Derivatives;
using FinlyticEngine.Services.Mqtt;
using FinlyticEngine.Services.Scoring;
using FinlyticEngine.Services.Trading;
using FinlyticEngine.Util;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

var builder = Host.CreateApplicationBuilder(args);

// 1. Register DbContext & Settings Provider
builder.Services.AddDbContext<EngineDbContext>(options =>
    options.UseNpgsql(builder.Configuration.GetConnectionString("DefaultConnection")));
builder.Services.AddScoped<ISettingsDbContext>(sp => sp.GetRequiredService<EngineDbContext>());

// 2. Register Core Services & Logger
builder.Services.AddSingleton<ISettingsService, SettingsService>();
builder.Services.AddSingleton(typeof(IFinlyticLogger<>), typeof(FinlyticLogger<>));

// 3. Register HTTP Client & AI Gate
builder.Services.AddHttpClient<IAiReasoningGateService, AiReasoningGateService>();
builder.Services.AddSingleton<IAiReasoningGateService, AiReasoningGateService>();

// 4. Register MQTT Client & RPC Bridge
builder.Services.AddSingleton<EngineMqttClient>();
builder.Services.AddSingleton<IEngineRpcClient>(sp => sp.GetRequiredService<EngineMqttClient>());
builder.Services.AddHostedService(sp => sp.GetRequiredService<EngineMqttClient>());

// 5. Register Engine Domain Services
// builder.Services.AddSingleton<ICompositeOpportunityScorer, CompositeOpportunityScorer>(); // V1 Fallback
builder.Services.AddSingleton<ICompositeOpportunityScorer, CompositeOpportunityScorerV2>(); // V2 Bidirectional Active
builder.Services.AddSingleton<IKnockOutDerivativeResolver, KnockOutDerivativeResolver>();
builder.Services.AddSingleton<ITradeLifecycleService, TradeLifecycleService>();
builder.Services.AddSingleton<IEvaluationHistoryService, EvaluationHistoryService>();

// 6. Register Background Poller & Monitoring Services
builder.Services.AddHostedService<OpportunityPollerBackgroundService>();
builder.Services.AddHostedService<ActiveTradeMonitoringBackgroundService>();

var host = builder.Build();

// 7. Startup database migrations
using (var scope = host.Services.CreateScope())
{
    try
    {
        var context = scope.ServiceProvider.GetRequiredService<EngineDbContext>();
        var connStr = builder.Configuration.GetConnectionString("DefaultConnection") ?? "";
        await context.MigrateWithBootstrapAsync(connStr);
        Console.WriteLine("Database migrations successfully executed for FinlyticEngine.");

    }
    catch (Exception ex)
    {
        Console.WriteLine($"Migration notice on startup: {ex.Message}");
    }
}

await host.RunAsync();