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Views/RegisterWindow.xaml.cs

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+using System.Windows;
+using Microsoft.EntityFrameworkCore;
+using SimpleWiki.Data;
+using SimpleWiki.Models;
+using SimpleWiki.Services;
+
+namespace SimpleWiki.Views;
+
+public partial class RegisterWindow : Window
+{
+    public RegisterWindow()
+    {
+        InitializeComponent();
+    }
+
+    private void RegisterButton_Click(object sender, RoutedEventArgs e)
+    {
+        var fullNameError = InputValidator.ValidateFullName(FullNameTextBox.Text);
+        var emailError = InputValidator.ValidateEmail(EmailTextBox.Text);
+        var passwordError = InputValidator.ValidatePassword(PasswordBox.Password);
+        var errors = InputValidator.JoinErrors(fullNameError, 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 exists = db.Users.AsNoTracking().Any(x => x.Email.ToLower() == email);
+
+        if (exists)
+        {
+            MessageBox.Show("Пользователь с таким email уже существует.", "Ошибка", MessageBoxButton.OK, MessageBoxImage.Error);
+            return;
+        }
+
+        var user = new User
+        {
+            FullName = FullNameTextBox.Text.Trim(),
+            Email = email,
+            PasswordHash = PasswordHasher.HashPassword(PasswordBox.Password),
+            Role = IsAdminCheckBox.IsChecked == true ? Roles.Admin : Roles.User,
+            CreatedAt = DateTime.UtcNow
+        };
+
+        db.Users.Add(user);
+        db.SaveChanges();
+
+        MessageBox.Show("Аккаунт создан. Теперь можно войти.", "Успех", MessageBoxButton.OK, MessageBoxImage.Information);
+        new LoginWindow().Show();
+        Close();
+    }
+
+    private void BackButton_Click(object sender, RoutedEventArgs e)
+    {
+        new LoginWindow().Show();
+        Close();
+    }
+}