Start adding server support

Application/Options/AccountsOptionsPanel.xaml.cs

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+using System.ComponentModel;
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Input;
+
+namespace FeedCenter.Options;
+
+public partial class AccountsOptionsPanel
+{
+    private readonly FeedCenterEntities _entities;
+
+    public AccountsOptionsPanel(Window parentWindow, FeedCenterEntities entities) : base(parentWindow, entities)
+    {
+        _entities = entities;
+
+        InitializeComponent();
+    }
+
+    public override string CategoryName => Properties.Resources.optionCategoryAccounts;
+
+    public override void LoadPanel()
+    {
+        base.LoadPanel();
+
+        var collectionViewSource = new CollectionViewSource { Source = _entities.Accounts };
+        collectionViewSource.SortDescriptions.Add(new SortDescription("Name", ListSortDirection.Ascending));
+        collectionViewSource.IsLiveSortingRequested = true;
+        collectionViewSource.View.Filter = item =>
+        {
+            if (item is not Account account)
+                return false;
+
+            // Filter out local accounts
+            return account.Type != AccountType.Local;
+        };
+
+        AccountDataGrid.ItemsSource = collectionViewSource.View;
+        AccountDataGrid.SelectedIndex = 0;
+
+        SetAccountButtonStates();
+    }
+
+    private void SetAccountButtonStates()
+    {
+        AddAccountButton.IsEnabled = true;
+
+        EditAccountButton.IsEnabled = AccountDataGrid.SelectedItem != null;
+        DeleteAccountButton.IsEnabled = AccountDataGrid.SelectedItem != null;
+    }
+
+    private void AddAccount()
+    {
+        var account = new Account(AccountType.Fever);
+
+        var accountWindow = new AccountWindow(_entities);
+
+        var result = accountWindow.Display(account, Window.GetWindow(this), true);
+
+        if (!result.HasValue || !result.Value)
+            return;
+
+        AccountDataGrid.SelectedItem = account;
+
+        SetAccountButtonStates();
+    }
+
+    private void EditSelectedAccount()
+    {
+        if (AccountDataGrid.SelectedItem == null)
+            return;
+
+        var account = (Account) AccountDataGrid.SelectedItem;
+
+        var accountWindow = new AccountWindow(_entities);
+
+        accountWindow.Display(account, Window.GetWindow(this), false);
+    }
+
+    private void DeleteSelectedAccount()
+    {
+        var account = (Account) AccountDataGrid.SelectedItem;
+
+        if (MessageBox.Show(ParentWindow, string.Format(Properties.Resources.ConfirmDeleteAccount, account.Name),
+                Properties.Resources.ConfirmDeleteTitle, MessageBoxButton.YesNo, MessageBoxImage.Question,
+                MessageBoxResult.No) == MessageBoxResult.No)
+            return;
+
+        var index = AccountDataGrid.SelectedIndex;
+
+        if (index == AccountDataGrid.Items.Count - 1)
+            AccountDataGrid.SelectedIndex = index - 1;
+        else
+            AccountDataGrid.SelectedIndex = index + 1;
+
+        _entities.SaveChanges(() => _entities.Accounts.Remove(account));
+
+        SetAccountButtonStates();
+    }
+
+    private void HandleAddAccountButtonClick(object sender, RoutedEventArgs e)
+    {
+        AddAccount();
+    }
+
+    private void HandleEditAccountButtonClick(object sender, RoutedEventArgs e)
+    {
+        EditSelectedAccount();
+    }
+
+    private void HandleDeleteAccountButtonClick(object sender, RoutedEventArgs e)
+    {
+        DeleteSelectedAccount();
+    }
+
+    private void HandleAccountDataGridSelectionChanged(object sender, SelectionChangedEventArgs e)
+    {
+        SetAccountButtonStates();
+    }
+
+    private void HandleAccountDataGridRowMouseDoubleClick(object sender, MouseButtonEventArgs e)
+    {
+        if (!EditAccountButton.IsEnabled)
+            return;
+
+        EditSelectedAccount();
+    }
+}