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Views/LoginWindow.xaml.cs

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+using System.Windows;
+using Microsoft.EntityFrameworkCore;
+using SimpleWiki.Data;
+using SimpleWiki.Services;
+
+namespace SimpleWiki.Views;
+
+public partial class LoginWindow : Window
+{
+    public LoginWindow()
+    {
+        InitializeComponent();
+    }
+
+    private void LoginButton_Click(object sender, RoutedEventArgs e)
+    {
+        var emailError = InputValidator.ValidateEmail(EmailTextBox.Text);
+        var passwordError = string.IsNullOrWhiteSpace(PasswordBox.Password) ? "Пароль обязателен." : null;
+        var errors = InputValidator.JoinErrors(emailError, passwordError);
+
+        if (!string.IsNullOrWhiteSpace(errors))
+        {
+            MessageBox.Show(errors, "Ошибка валидации", MessageBoxButton.OK, MessageBoxImage.Warning);
+            return;
+        }
+
+        using var db = new AppDbContext();
+        var email = EmailTextBox.Text.Trim().ToLowerInvariant();
+        var user = db.Users.AsNoTracking().FirstOrDefault(x => x.Email.ToLower() == email);
+
+        if (user is null || !PasswordHasher.VerifyPassword(PasswordBox.Password, user.PasswordHash))
+        {
+            MessageBox.Show("Неверный email или пароль.", "Ошибка", MessageBoxButton.OK, MessageBoxImage.Error);
+            return;
+        }
+
+        SessionService.CurrentUser = user;
+        new MainWindow(user).Show();
+        Close();
+    }
+
+    private void OpenRegisterButton_Click(object sender, RoutedEventArgs e)
+    {
+        new RegisterWindow().Show();
+        Close();
+    }
+
+    private void OpenForgotPasswordButton_Click(object sender, RoutedEventArgs e)
+    {
+        new ForgotPasswordWindow().Show();
+        Close();
+    }
+}