using IBKRTrader.Core.AI;
using IBKRTrader.Core.Budget;
using IBKRTrader.Core.Configuration;
using IBKRTrader.Core.DependencyInjection;
using IBKRTrader.Core.IBKR;
using IBKRTrader.Core.Logging;
using IBKRTrader.Core.Modularity;
using IBKRTrader.Core.Persistence;
using IBKRTrader.Core.Persistence.Ef;
using IBKRTrader.Core.Security;
using IBKRTrader.Core.Settings;
using IBKRTrader.Core.Time;
using IBKRTrader.Core.Trading;
using IBKRTrader.Core.Trading.Ibkr;
using IBKRTrader.Core.Workers;
using IBKRTrader.Core.Workers.BuiltIn;
using IBKRTrader.Modules.Accounting;
using IBKRTrader.Modules.CongressTrading;
using IBKRTrader.Modules.Supervisor;
using IBKRTrader.UI;
using IBKRTrader.UI.Views;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace IBKRTrader;

internal static class Program
{
    public static IHost? AppHost { get; private set; }

    [STAThread]
    static void Main(string[] args)
    {
        // Headless-Smoke-Test der UI (konstruiert jede View + Launcher, ohne Message-Loop).
        if (args.Length > 0 && string.Equals(args[0], "--smoke-ui", StringComparison.OrdinalIgnoreCase))
        {
            Environment.ExitCode = RunSmokeUi();
            return;
        }

        // Diagnose: gibt die MySQL/MariaDB-Serverversion aus (für das EF-ServerVersion-Pinning).
        if (args.Length > 0 && string.Equals(args[0], "--db-version", StringComparison.OrdinalIgnoreCase))
        {
            RunDbVersion();
            return;
        }

        ApplicationConfiguration.Initialize();

        var modules = new List<IModule> { new CongressTradingModule(), new AccountingModule(), new SupervisorModule() };

        AppHost = Host.CreateDefaultBuilder()
            .UseContentRoot(AppContext.BaseDirectory)
            .ConfigureAppConfiguration((_, config) =>
                config.AddJsonFile("appsettings.Local.json", optional: true, reloadOnChange: false))
            .ConfigureServices((context, services) =>
            {
                RegisterCoreServices(services, context.Configuration);
                foreach (var module in modules)
                {
                    services.AddSingleton(module);
                    module.RegisterServices(services, context.Configuration);
                }
                services.AddSingleton<ShellUiHost>();
                services.AddSingleton<IModuleUiHost>(sp => sp.GetRequiredService<ShellUiHost>());
                services.AddSingleton<LauncherForm>();
            })
            .Build();

        // Betriebszeitzone VOR dem ersten Logeintrag setzen – sie bestimmt die Tagesgrenzen der
        // Logdateien. Wird sie später gesetzt, landen die ersten Zeilen in der falschen Datei.
        var startupLog = AppHost.Services.GetRequiredService<LoggingService>();
        ConfigureAppTimeZone(AppHost.Services, startupLog);

        // Sicherheit: Master-Key laden (VOR jeder Entschlüsselung) und DB-TLS prüfen.
        ConfigureSecretProtection(startupLog);
        WarnIfDbTlsNotEnforced(AppHost.Services, startupLog);

        // Zirkuläre Abhängigkeit auflösen: WebApiService braucht die Engine-Referenz (vor dem Start).
        AppHost.Services.GetRequiredService<WebApiService>()
               .SetEngine(AppHost.Services.GetRequiredService<WorkerEngine>());

        // Host starten → alle Worker/Services (IHostedService) laufen an.
        AppHost.Start();

        // Views registrieren (Core + Module), dann Launcher starten.
        var uiHost = AppHost.Services.GetRequiredService<ShellUiHost>();
        RegisterCoreViews(uiHost, AppHost.Services);
        foreach (var module in modules)
            module.RegisterUi(uiHost, AppHost.Services);
        ModuleViews.Register(uiHost, AppHost.Services);
        ViewIcons.AssignDefaults(uiHost);

        Application.Run(AppHost.Services.GetRequiredService<LauncherForm>());
        AppHost.StopAsync().GetAwaiter().GetResult();
    }

    /// <summary>Registriert alle Core-Services im DI-Container.</summary>
    private static void RegisterCoreServices(IServiceCollection services, IConfiguration configuration)
    {
        // EF-Core-Persistenz (Connection aus appsettings.Local.json).
        services.AddCorePersistence(new DatabaseOptions
        {
            MySqlConnectionString = configuration["Database:MySqlConnectionString"] ?? string.Empty
        });

        // Settings zuerst laden (eine Quelle, als Singleton weitergereicht).
        var settingsService = new SettingsService();
        settingsService.Load();
        services.AddSingleton(settingsService);

        services.AddSingleton<LoggingService>();

        services.AddSingleton<CoreSettingsService>();       // core_settings via EF

        services.AddSingleton<IBKRGatewayService>();
        services.AddSingleton<IBKRMarketDataRepository>();

        services.AddSingleton<BudgetService>();
        services.AddSingleton<TradeHistoryService>();
        services.AddSingleton<AIModelService>();

        // Datenfundament für Analyse/Forensik (Supervisor): Entscheidungsjournal + Order-Events.
        services.AddSingleton<IDecisionJournal, EfDecisionJournal>();
        services.AddSingleton<IOrderEventLog, EfOrderEventLog>();

        // Trading-Kern
        services.AddSingleton<DashboardService>();
        services.AddSingleton<IRiskService, RiskService>();
        services.AddSingleton<IPortfolioService, PortfolioService>();
        services.AddSingleton<IExecutionService, ExecutionService>();
        // Echter TWS-Broker nur, wenn ausdrücklich aktiviert – sonst der NullBroker, der nie handelt.
        // Beide Rollen (Handel + lesender Bestandsabgleich) bedient dieselbe Instanz.
        if (settingsService.Settings.IBKR.UseTwsApi)
        {
            services.AddSingleton<IbkrBrokerClient>();
            services.AddSingleton<IBrokerClient>(sp => sp.GetRequiredService<IbkrBrokerClient>());
            services.AddSingleton<IBrokerPortfolioReader>(sp => sp.GetRequiredService<IbkrBrokerClient>());
        }
        else
        {
            services.AddSingleton<NullBrokerClient>();
            services.AddSingleton<IBrokerClient>(sp => sp.GetRequiredService<NullBrokerClient>());
            services.AddSingleton<IBrokerPortfolioReader>(sp => sp.GetRequiredService<NullBrokerClient>());
        }

        // Core-Worker/Services
        services.AddSingleton<BackupWorker>();
        services.AddSingleton<WebserverService>();
        services.AddSingleton<WebApiService>();
        services.AddSingleton<IBKRInstrumentSyncWorker>();
        services.AddSingleton<IBKRPriceHistoryWorker>();

        // Als IWorker registrieren → die WorkerEngine erhält alle über IEnumerable<IWorker> (nur UI/Registry).
        services.AddSingleton<IWorker>(sp => sp.GetRequiredService<BackupWorker>());
        services.AddSingleton<IWorker>(sp => sp.GetRequiredService<WebserverService>());
        services.AddSingleton<IWorker>(sp => sp.GetRequiredService<WebApiService>());
        services.AddSingleton<IWorker>(sp => sp.GetRequiredService<IBKRInstrumentSyncWorker>());
        services.AddSingleton<IWorker>(sp => sp.GetRequiredService<IBKRPriceHistoryWorker>());

        // Lebenszyklus über den Generic Host (jeder Worker ist ein IHostedService).
        services.AddHostedService(sp => sp.GetRequiredService<BackupWorker>());
        services.AddHostedService(sp => sp.GetRequiredService<WebserverService>());
        services.AddHostedService(sp => sp.GetRequiredService<WebApiService>());
        services.AddHostedService(sp => sp.GetRequiredService<IBKRInstrumentSyncWorker>());
        services.AddHostedService(sp => sp.GetRequiredService<IBKRPriceHistoryWorker>());

        services.AddSingleton<WorkerEngine>();
    }

    /// <summary>Registriert die Core-Views (Logs, Settings, Workers) bei der Shell.</summary>
    private static void RegisterCoreViews(IModuleUiHost uiHost, IServiceProvider sp)
    {
        uiHost.RegisterView(new ModuleView
        {
            Id = "core.dashboard", Title = "Dashboard", Group = "Core", Order = 5,
            CreateView = () => new DashboardView(
                sp.GetRequiredService<DashboardService>(),
                sp.GetRequiredService<SettingsService>(),
                sp.GetServices<IModule>(),
                sp.GetRequiredService<IConfiguration>(),
                sp.GetServices<IWorker>())
        });
        uiHost.RegisterView(new ModuleView
        {
            Id = "core.workers", Title = "Workers / Services", Group = "Core", Order = 10,
            CreateView = () => new WorkersView(sp.GetRequiredService<WorkerEngine>())
        });
        uiHost.RegisterView(new ModuleView
        {
            Id = "core.logs", Title = "Logs", Group = "Core", Order = 20,
            CreateView = () => new LogsView(sp.GetRequiredService<LoggingService>())
        });
        uiHost.RegisterView(new ModuleView
        {
            Id = "core.settings", Title = "Settings", Group = "Core", Order = 30,
            CreateView = () => new SettingsView(sp.GetRequiredService<SettingsService>())
        });
    }

    /// <summary>
    /// Setzt die Betriebszeitzone dieser Instanz aus den Einstellungen. Sie gilt für Anzeige,
    /// Logdatei-Tagesgrenzen, Berichtszeiten und Buchungsperioden; gespeichert wird weiterhin UTC.
    ///
    /// <para>Wir betreiben Instanzen in EU und US. Ohne diese Festlegung hinge die Ortszeit an der
    /// Zeitzone des Rechners – auf einem UTC-Container also woanders als auf dem Windows-Desktop,
    /// lautlos und ohne Fehlermeldung. Die Zeitzone wird vor den ersten Trades gesetzt und danach
    /// nicht mehr gewechselt.</para>
    /// </summary>
    private static void ConfigureAppTimeZone(IServiceProvider services, LoggingService logger)
    {
        var configured = services.GetRequiredService<SettingsService>().Settings.Trading.ApplicationTimeZoneId;
        AppTimeZone.Configure(configured, msg => logger.Warn("Core", msg));
        logger.Info("Core", $"Betriebszeitzone: {AppTimeZone.CurrentId} (Persistenz bleibt UTC).");
    }

    /// <summary>
    /// Lädt den Master-Key (env IBKRTRADER_MASTER_KEY, sonst gitignorierte master.key) und aktiviert die
    /// at-rest-Verschlüsselung. Ohne Key läuft die App mit Klartext – mit deutlicher Warnung.
    /// </summary>
    private static void ConfigureSecretProtection(LoggingService logger)
    {
        var masterKey = Environment.GetEnvironmentVariable("IBKRTRADER_MASTER_KEY");
        if (string.IsNullOrWhiteSpace(masterKey))
        {
            var keyFile = Path.Combine(AppContext.BaseDirectory, "master.key");
            if (File.Exists(keyFile)) masterKey = File.ReadAllText(keyFile).Trim();
        }
        SecretProtection.Configure(masterKey);

        if (SecretProtection.IsConfigured)
            logger.Info("Core", "🔐 Secret-Verschlüsselung aktiv – sensible Daten werden at-rest verschlüsselt (AES-256-GCM).");
        else
            logger.Warn("Core", "⚠️ SICHERHEIT: Kein IBKRTRADER_MASTER_KEY gesetzt – sensible Daten würden UNVERSCHLÜSSELT gespeichert. " +
                                "Master-Key setzen (env IBKRTRADER_MASTER_KEY oder Datei master.key).");
    }

    /// <summary>Warnt, wenn der DB-Connection-String keine TLS-Option (SslMode) enthält. Der String wird NICHT geloggt.</summary>
    private static void WarnIfDbTlsNotEnforced(IServiceProvider services, LoggingService logger)
    {
        try
        {
            var conn = services.GetService<IConfiguration>()?["Database:MySqlConnectionString"] ?? string.Empty;
            if (string.IsNullOrEmpty(conn)) return;
            if (conn.IndexOf("sslmode", StringComparison.OrdinalIgnoreCase) < 0)
                logger.Warn("Core", "⚠️ SICHERHEIT: DB-Verbindung ohne SslMode – Transportverschlüsselung nicht erzwungen. " +
                                    "Im Connection-String 'SslMode=Required' setzen.");
        }
        catch { /* best-effort, darf den Start nie stören */ }
    }

    /// <summary>Diagnose: öffnet die DB (aus settings.json) und gibt die Serverversion aus. Kein UI.</summary>
    private static void RunDbVersion()
    {
        var settings = new SettingsService();
        settings.Load();
        var conn = settings.Settings.Database.BuildConnectionString();
        try
        {
            using var c = new MySqlConnector.MySqlConnection(conn);
            c.Open();
            Console.WriteLine($"ServerVersion: {c.ServerVersion}");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"FEHLER: {ex.GetType().Name}: {ex.Message}");
        }
    }

    /// <summary>
    /// Headless-Smoke-Test: baut den Host, registriert Views + Modul-UI und konstruiert jede
    /// registrierte View sowie den Launcher – ohne Message-Loop. Gibt die Fehleranzahl zurück.
    /// </summary>
    private static int RunSmokeUi()
    {
        ApplicationConfiguration.Initialize();

        var modules = new List<IModule> { new CongressTradingModule(), new AccountingModule(), new SupervisorModule() };

        using var host = Host.CreateDefaultBuilder()
            .UseContentRoot(AppContext.BaseDirectory)
            .ConfigureAppConfiguration((_, config) =>
                config.AddJsonFile("appsettings.Local.json", optional: true, reloadOnChange: false))
            .ConfigureServices((context, services) =>
            {
                RegisterCoreServices(services, context.Configuration);
                foreach (var module in modules)
                {
                    services.AddSingleton(module);
                    module.RegisterServices(services, context.Configuration);
                }
                services.AddSingleton<ShellUiHost>();
                services.AddSingleton<IModuleUiHost>(s => s.GetRequiredService<ShellUiHost>());
                services.AddSingleton<LauncherForm>();
            })
            .Build();

        ConfigureAppTimeZone(host.Services, host.Services.GetRequiredService<LoggingService>());

        host.Services.GetRequiredService<WebApiService>()
            .SetEngine(host.Services.GetRequiredService<WorkerEngine>());

        var uiHost = host.Services.GetRequiredService<ShellUiHost>();
        RegisterCoreViews(uiHost, host.Services);
        foreach (var module in modules)
            module.RegisterUi(uiHost, host.Services);
        ModuleViews.Register(uiHost, host.Services);
        ViewIcons.AssignDefaults(uiHost);

        var failures = 0;
        Console.WriteLine("=== Smoke-UI: View-Konstruktion ===");
        foreach (var view in uiHost.Views)
        {
            try { using var form = (Form)view.CreateView(); Console.WriteLine($"[OK] {view.Id} ({view.Title})"); }
            catch (Exception ex) { failures++; Console.WriteLine($"[FEHLER] {view.Id}: {ex.GetType().Name}: {ex.Message}"); }
        }

        try { using var launcher = host.Services.GetRequiredService<LauncherForm>(); Console.WriteLine("[OK] LauncherForm konstruiert"); }
        catch (Exception ex) { failures++; Console.WriteLine($"[FEHLER] LauncherForm: {ex.GetType().Name}: {ex.Message}"); }

        Console.WriteLine(failures == 0 ? "=== Smoke-UI OK ===" : $"=== Smoke-UI: {failures} Fehler ===");
        return failures;
    }
}