using CineBook.Data;
using CineBook.Helpers;
using System.Windows;
using System.Windows.Controls;

namespace CineBook.Views;

public partial class MainWindow : Window
{
    private readonly Repository _repo;
    private Button? _activeNavBtn;

    public MainWindow()
    {
        InitializeComponent();

        if (!Session.IsLoggedIn)
        {
            // Schutz gegen NullReference, falls MainWindow direkt gestartet wird.
            new LoginWindow().Show();
            Close();
            return;
        }

        var cs = DbConfig.GetConnectionString();
        if (string.IsNullOrWhiteSpace(cs))
        {
            MessageBox.Show(
                "DB-Verbindung nicht konfiguriert. Bitte setze 'CINEBOOK_CONNECTION_STRING'.",
                "Konfiguration fehlt",
                MessageBoxButton.OK,
                MessageBoxImage.Error);
            new LoginWindow().Show();
            Close();
            return;
        }

        var db = new Db(cs);
        _repo = new Repository(db);

        UserInfoText.Text = $"[ {Session.CurrentUser!.Username.ToUpper()} | {Session.CurrentUser!.Role.ToUpper()} ]";

        if (Session.IsAdmin)
            BtnAdmin.Visibility = Visibility.Visible;

        SetStats();
        Navigate("movies", BtnMovies);
    }

    private void NavClick(object sender, RoutedEventArgs e)
    {
        if (sender is Button btn)
            Navigate(btn.Tag?.ToString() ?? "movies", btn);
    }

    private void Navigate(string view, Button btn)
    {
        if (_activeNavBtn != null)
            _activeNavBtn.Style = (Style)Resources["NavButton"];
        btn.Style = (Style)Resources["NavButtonActive"];
        _activeNavBtn = btn;

        MainContent.Content = view switch
        {
            "movies"     => new MovieListView(_repo),
            "screenings" => new ScreeningsView(_repo),
            "bookings"   => new BookingsView(_repo, Session.CurrentUser!),
            "admin"      => new AdminPanelView(_repo),
            "mine"       => new MyBookingsView(_repo, Session.CurrentUser!),
            _            => new MovieListView(_repo)
        };
    }

    private void LogoutClick(object sender, RoutedEventArgs e)
    {
        Session.Logout();
        new LoginWindow().Show();
        Close();
    }

    private void SetStats()
    {
        try
        {
            var (movies, screenings, bookings, users) = _repo.GetStats();
            StatsText.Text = $"Filme: {movies}  |  Vorführungen: {screenings}  |  Buchungen: {bookings}  |  Benutzer: {users}";
            DbStatusText.Text = "● DB VERBUNDEN";
            DbStatusText.Foreground = System.Windows.Media.Brushes.LimeGreen;
        }
        catch
        {
            DbStatusText.Text = "● DB NICHT ERREICHBAR";
            DbStatusText.Foreground = System.Windows.Media.Brushes.Red;
        }
    }
}