using IBKRTrader.Core.Logging;
using IBKRTrader.Core.Modularity;
using IBKRTrader.Core.Settings;
using IBKRTrader.Core.Trading;
using IBKRTrader.Core.Workers;
using IBKRTrader.Hosting;
using IBKRTrader.UI;
using IBKRTrader.UI.Views;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace IBKRTrader;

/// <summary>
/// Einstiegspunkt der WinForms-Shell (Windows).
///
/// <para>Der Host selbst kommt aus <see cref="AppHostBuilder"/> und ist plattformneutral – hier
/// wird er nur um Fensterverwaltung und Launcher ergänzt. Derselbe Host trägt den kopflosen
/// Linux-Dienst <c>IBKRTrader.Daemon</c>; so kann keine der beiden Varianten eine Registrierung
/// vergessen.</para>
/// </summary>
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;
        }

        ApplicationConfiguration.Initialize();

        var modules = AppHostBuilder.CreateModules();
        AppHost = AppHostBuilder.Build(modules, RegisterShellServices);

        AppHostBuilder.RunStartupChecks(AppHost.Services);

        // 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>Nur die Dienste, die es ohne Oberfläche nicht gibt.</summary>
    private static void RegisterShellServices(IServiceCollection services, IConfiguration configuration)
    {
        services.AddSingleton<ShellUiHost>();
        services.AddSingleton<IModuleUiHost>(sp => sp.GetRequiredService<ShellUiHost>());
        services.AddSingleton<LauncherForm>();
    }

    /// <summary>Registriert die Core-Views (Dashboard, Workers, Logs, Settings) 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>
    /// 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.
    /// Der Host wird bewusst NICHT gestartet: sonst liefen Worker und Broker-Verbindungen an,
    /// was für eine reine Konstruktionsprüfung unerwünscht ist.
    /// </summary>
    private static int RunSmokeUi()
    {
        ApplicationConfiguration.Initialize();

        var modules = AppHostBuilder.CreateModules();
        using var host = AppHostBuilder.Build(modules, RegisterShellServices);

        AppHostBuilder.RunStartupChecks(host.Services);

        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;
    }
}