Refactor. Add data layer

BudgetApp/Components/Pages/Register.razor.cs

@@ -0,0 +1,44 @@
+using BudgetApp.Data.Entities;
+using Microsoft.AspNetCore.Components;
+
+namespace BudgetApp.Components.Pages;
+
+public partial class Register
+{
+    [SupplyParameterFromForm] private RegisterModel Model { get; set; } = new();
+
+    private string? _errorMessage;
+
+    private async Task HandleRegister()
+    {
+        _errorMessage = null;
+
+        var user = new ApplicationUser { UserName = Model.Email, Email = Model.Email };
+        var result = await UserManager.CreateAsync(user, Model.Password);
+
+        if (result.Succeeded)
+        {
+            await SignInManager.SignInAsync(user, isPersistent: false);
+            Navigation.NavigateTo("/", forceLoad: true);
+        }
+        else
+        {
+            _errorMessage = string.Join(" ", result.Errors.Select(e => e.Description));
+        }
+    }
+
+    private sealed class RegisterModel
+    {
+        [System.ComponentModel.DataAnnotations.Required(ErrorMessage = "Email is required")]
+        [System.ComponentModel.DataAnnotations.EmailAddress(ErrorMessage = "Invalid email address")]
+        public string Email { get; set; } = string.Empty;
+
+        [System.ComponentModel.DataAnnotations.Required(ErrorMessage = "Password is required")]
+        [System.ComponentModel.DataAnnotations.MinLength(8, ErrorMessage = "Password must be at least 8 characters")]
+        public string Password { get; set; } = string.Empty;
+
+        [System.ComponentModel.DataAnnotations.Required(ErrorMessage = "Please confirm your password")]
+        [System.ComponentModel.DataAnnotations.Compare(nameof(Password), ErrorMessage = "Passwords do not match")]
+        public string ConfirmPassword { get; set; } = string.Empty;
+    }
+}