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

namespace CursorLang;

// ReSharper disable once RedundantExtendsListEntry
public partial class App : Application
{
    private ServiceProvider? _services;
    private SingleInstanceGate? _instanceGate;
    private MainWindowPresenter? _presenter;
    private ITrayIcon? _tray;

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

        bool automatic = StartupLaunch.IsAutomatic(e.Args);

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

        _instanceGate = gate;
        _instanceGate.ActivationRequested += OnActivationRequested;

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

        _services.GetRequiredService<ThemeService>();

        _presenter = _services.GetRequiredService<MainWindowPresenter>();

        MainWindow = _services.GetRequiredService<MainWindow>();

        _tray = _services.GetRequiredService<ITrayIcon>();
        _tray.OpenRequested += OnOpenRequested;
        _tray.ExitRequested += OnExitRequested;

        bool hasTray = _tray.Install();

        if (!automatic || !hasTray)
        {
            _presenter.Show();
        }

        if (!hasTray)
        {
            _presenter.Detach();
            ShutdownMode = ShutdownMode.OnMainWindowClose;
        }

        _ = _services.GetRequiredService<SettingsViewModel>().InitializeAsync();
        _ = _services.GetRequiredService<UpdateViewModel>().StartAsync();
        _services.GetRequiredService<LayoutNotificationCoordinator>().Start();
        _services.GetRequiredService<CapsLockSwitchCoordinator>().Start();
    }

    protected override void OnExit(ExitEventArgs e)
    {
        if (_tray is not null)
        {
            _tray.OpenRequested -= OnOpenRequested;
            _tray.ExitRequested -= OnExitRequested;
        }

        _services?.Dispose();

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

        base.OnExit(e);
    }

    private void OnActivationRequested(object? sender, EventArgs e) => _presenter?.Show();

    private void OnOpenRequested(object? sender, EventArgs e) => _presenter?.Show();

    private void OnExitRequested(object? sender, EventArgs e)
    {
        _presenter?.AllowClose();
        Shutdown();
    }

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

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

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

        services.AddSingleton<MainWindowPlacement>();
        services.AddSingleton<MainWindowPresenter>();

        services.AddSingleton<TrayIcon>();
        services.AddSingleton<ITrayIcon>(provider => provider.GetRequiredService<TrayIcon>());

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

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

        services.AddSingleton<LayoutPopupWindow>();
        services.AddSingleton<ILayoutPopupWindow>(provider => provider.GetRequiredService<LayoutPopupWindow>());
        services.AddSingleton<MainWindow>();
    }
}