using System.Windows;
using CursorLang.Models;
using CursorLang.Services;
using CursorLang.ViewModels;
using CursorLang.Views;
using Microsoft.Extensions.DependencyInjection;

namespace CursorLang;

/// <summary>
/// Композиционный корень: собирает контейнер и запускает окно настроек.
/// </summary>
public partial class App : Application
{
    private ServiceProvider? _services;
    private SingleInstanceGate? _instanceGate;

    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);

        var gate = new SingleInstanceGate();
        if (!gate.TryAcquire())
        {
            gate.Dispose();
            Shutdown();
            return;
        }

        _instanceGate = gate;
        _instanceGate.ActivationRequested += OnActivationRequested;

        var services = new ServiceCollection();
        ConfigureServices(services);
        _services = services.BuildServiceProvider();

        _services.GetRequiredService<ThemeService>();

        MainWindow = _services.GetRequiredService<MainWindow>();
        MainWindow.Show();

        _services.GetRequiredService<LayoutNotificationCoordinator>().Start();
        _services.GetRequiredService<CapsLockSwitchCoordinator>().Start();
    }

    protected override void OnExit(ExitEventArgs e)
    {
        _services?.Dispose();

        if (_instanceGate is not null)
        {
            _instanceGate.ActivationRequested -= OnActivationRequested;
            _instanceGate.Dispose();
        }

        base.OnExit(e);
    }

    private void OnActivationRequested(object? sender, EventArgs e)
    {
        if (MainWindow is not { IsVisible: true })
        {
            return;
        }

        if (MainWindow.WindowState == WindowState.Minimized)
        {
            MainWindow.WindowState = WindowState.Normal;
        }

        MainWindow.Activate();
    }

    private static void ConfigureServices(IServiceCollection services)
    {
        services.AddSingleton(new KeyboardLayoutOptions());

        services.AddSingleton<SettingsService>();
        services.AddSingleton(provider => provider.GetRequiredService<SettingsService>().Load());

        services.AddSingleton<ThemeService>();
        services.AddSingleton<IThemeService>(provider => provider.GetRequiredService<ThemeService>());

        services.AddSingleton<ILocalizationService, LocalizationService>();
        services.AddSingleton<IKeyboardLayoutService, KeyboardLayoutService>();
        services.AddSingleton<ILayoutPopupService, LayoutPopupService>();
        services.AddSingleton<ICapsLockHotkeyService, CapsLockHotkeyService>();
        services.AddSingleton<LayoutNotificationCoordinator>();
        services.AddSingleton<CapsLockSwitchCoordinator>();

        services.AddSingleton<LayoutPopupViewModel>();
        services.AddSingleton<SettingsViewModel>();

        services.AddSingleton<LayoutPopupWindow>();
        services.AddSingleton<MainWindow>();
    }
}