redesigned payment page + a lot of fixes

frontend/pweb/lib/controllers/auth/account_name.dart

@@ -0,0 +1,143 @@
+import 'package:flutter/material.dart';
+
+import 'package:pshared/provider/account.dart';
+
+import 'package:pweb/models/state/edit_state.dart';
+
+
+class AccountNameController extends ChangeNotifier {
+  AccountNameController({
+    required this.initialFirstName,
+    required this.initialLastName,
+    required this.errorMessage,
+  }) {
+    _firstNameController = TextEditingController(text: initialFirstName);
+    _lastNameController = TextEditingController(text: initialLastName);
+    _lastSyncedFirstName = initialFirstName;
+    _lastSyncedLastName = initialLastName;
+  }
+
+  AccountProvider? _accountProvider;
+  final String initialFirstName;
+  final String initialLastName;
+  final String errorMessage;
+
+  late final TextEditingController _firstNameController;
+  late final TextEditingController _lastNameController;
+  EditState _editState = EditState.view;
+  String _errorText = '';
+  bool _disposed = false;
+  String _lastSyncedFirstName = '';
+  String _lastSyncedLastName = '';
+
+  TextEditingController get firstNameController => _firstNameController;
+  TextEditingController get lastNameController => _lastNameController;
+  EditState get editState => _editState;
+  String get errorText => _errorText;
+  bool get isEditing => _editState != EditState.view;
+  bool get isSaving => _editState == EditState.saving;
+  bool get isBusy => (_accountProvider?.isLoading ?? false) || isSaving;
+
+  String get currentFirstName =>
+      _accountProvider?.account?.name ?? initialFirstName;
+  String get currentLastName =>
+      _accountProvider?.account?.lastName ?? initialLastName;
+  String get currentFullName {
+    final first = currentFirstName.trim();
+    final last = currentLastName.trim();
+    if (first.isEmpty && last.isEmpty) return '';
+    if (first.isEmpty) return last;
+    if (last.isEmpty) return first;
+    return '$first $last';
+  }
+
+  void update(AccountProvider accountProvider) {
+    _accountProvider = accountProvider;
+    final changed = _syncNamesFromProvider();
+    if (changed) {
+      notifyListeners();
+    }
+  }
+
+  void startEditing() => _setState(EditState.edit);
+
+  void cancelEditing() {
+    _firstNameController.text = currentFirstName;
+    _lastNameController.text = currentLastName;
+    _setError('');
+    _setState(EditState.view);
+  }
+
+  Future<bool> save() async {
+    final accountProvider = _accountProvider;
+    if (accountProvider == null) return false;
+
+    final newFirstName = _firstNameController.text.trim();
+    final newLastName = _lastNameController.text.trim();
+    final currentFirst = currentFirstName;
+    final currentLast = currentLastName;
+
+    if (newFirstName.isEmpty ||
+        (newFirstName == currentFirst && newLastName == currentLast)) {
+      cancelEditing();
+      return false;
+    }
+
+    _setError('');
+    _setState(EditState.saving);
+
+    try {
+      await accountProvider.resetUsername(
+        newFirstName,
+        lastName: newLastName,
+      );
+      _setState(EditState.view);
+      return true;
+    } catch (_) {
+      _setError(errorMessage);
+      _setState(EditState.edit);
+      return false;
+    } finally {
+      if (_editState == EditState.saving) {
+        _setState(EditState.edit);
+      }
+    }
+  }
+
+  bool _syncNamesFromProvider() {
+    if (isEditing) return false;
+    final latestFirstName = currentFirstName;
+    final latestLastName = currentLastName;
+    final didChange = latestFirstName != _lastSyncedFirstName ||
+        latestLastName != _lastSyncedLastName;
+    if (_firstNameController.text != latestFirstName) {
+      _firstNameController.text = latestFirstName;
+    }
+    if (_lastNameController.text != latestLastName) {
+      _lastNameController.text = latestLastName;
+    }
+    _lastSyncedFirstName = latestFirstName;
+    _lastSyncedLastName = latestLastName;
+    return didChange;
+  }
+
+  void _setState(EditState value) {
+    if (_disposed || _editState == value) return;
+    _editState = value;
+    notifyListeners();
+  }
+
+  void _setError(String value) {
+    if (_disposed) return;
+    _errorText = value;
+    notifyListeners();
+  }
+
+  @override
+  void dispose() {
+    _disposed = true;
+    _firstNameController.dispose();
+    _lastNameController.dispose();
+    super.dispose();
+  }
+}