CineBook/Views/LoginWindow.xaml.cs

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

namespace CineBook.Views;

public partial class LoginWindow : Window
{
    private readonly Repository _repo;
    private readonly bool _dbConfigured;

    public LoginWindow()
    {
        InitializeComponent();

        var cs = DbConfig.GetConnectionString();
        if (string.IsNullOrWhiteSpace(cs))
        {
            MessageBox.Show(
                "Es ist keine DB-Verbindung konfiguriert.\n\n" +
                "Bitte setze die Umgebungsvariable 'CINEBOOK_CONNECTION_STRING'.\n" +
                "(Siehe Kommentar in Data/DbConfig.cs)",
                "Konfiguration fehlt",
                MessageBoxButton.OK,
                MessageBoxImage.Error);
            // Window bleibt offen, damit die Info sichtbar bleibt.
            _repo = new Repository(new Db(""));
            _dbConfigured = false;
        }
        else
        {
            var db = new Db(cs);
            _repo = new Repository(db);
            _dbConfigured = true;
        }
        UsernameBox.Focus();
    }

    private void LoginClick(object sender, RoutedEventArgs e) => TryLogin();

    private void InputKeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Enter) TryLogin();
    }

    private void TryLogin()
    {
        if (!_dbConfigured)
        {
            ShowError("DB-Verbindung nicht konfiguriert (CINEBOOK_CONNECTION_STRING). Login nicht möglich.");
            return;
        }
        var user = UsernameBox.Text.Trim();
        var pass = PasswordBox.Password;

        if (string.IsNullOrEmpty(user) || string.IsNullOrEmpty(pass))
        {
            ShowError("Bitte Benutzername und Passwort eingeben.");
            return;
        }

        try
        {
            var found = _repo.GetUserByCredentials(user, pass);
            if (found == null)
            {
                ShowError("Falscher Benutzername oder Passwort.");
                PasswordBox.Clear();
                return;
            }
            Session.CurrentUser = found;
            var main = new MainWindow();
            main.Show();
            Close();
        }
        catch (System.Exception ex)
        {
            ShowError("DB-Fehler: " + ex.Message);
        }
    }

    private void ShowError(string msg)
    {
        StatusText.Text = "⚠ " + msg;
        StatusText.Visibility = Visibility.Visible;
    }
}