refactoring for recipient addition page

frontend/pweb/lib/pages/address_book/form/body.dart

@@ -0,0 +1,120 @@
+import 'package:flutter/material.dart';
+
+import 'package:provider/provider.dart';
+
+import 'package:pshared/models/payment/methods/data.dart';
+import 'package:pshared/models/payment/type.dart';
+
+import 'package:pweb/pages/address_book/form/view.dart';
+import 'package:pweb/providers/address_book_recipient_form.dart';
+import 'package:pweb/utils/payment/availability.dart';
+
+
+class AddressBookRecipientFormBody extends StatefulWidget {
+  final GlobalKey<FormState> formKey;
+  final TextEditingController nameCtrl;
+  final TextEditingController emailCtrl;
+  final bool isEditing;
+  final Future<void> Function(AddressBookRecipientFormProvider) onSave;
+  final VoidCallback onBack;
+
+  const AddressBookRecipientFormBody({
+    required this.formKey,
+    required this.nameCtrl,
+    required this.emailCtrl,
+    required this.isEditing,
+    required this.onSave,
+    required this.onBack,
+  });
+
+  @override
+  State<AddressBookRecipientFormBody> createState() => _AddressBookRecipientFormBodyState();
+}
+
+class _AddressBookRecipientFormBodyState extends State<AddressBookRecipientFormBody> {
+  PaymentType? _selectedType;
+  int? _selectedIndex;
+
+  void _reconcileSelection(AddressBookRecipientFormProvider formState) {
+    final types = formState.supportedTypes;
+    if (types.isEmpty) return;
+
+    var nextType = _selectedType;
+    var nextIndex = _selectedIndex;
+
+    if (nextType == null || !types.contains(nextType)) {
+      nextType = formState.preferredType ?? types.first;
+      nextIndex = null;
+    }
+
+    final entries = formState.methods[nextType] ?? const [];
+    if (entries.isEmpty) {
+      nextIndex = null;
+    } else if (nextIndex == null || nextIndex < 0 || nextIndex >= entries.length) {
+      nextIndex = 0;
+    }
+
+    if (nextType == _selectedType && nextIndex == _selectedIndex) return;
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      if (!mounted) return;
+      setState(() {
+        _selectedType = nextType;
+        _selectedIndex = nextIndex;
+      });
+    });
+  }
+
+  void _onMethodSelected(PaymentType type, int index) {
+    setState(() {
+      _selectedType = type;
+      _selectedIndex = index;
+    });
+  }
+
+  void _onMethodAdd(AddressBookRecipientFormProvider formState, PaymentType type) {
+    final newIndex = formState.addMethod(type);
+    setState(() {
+      _selectedType = type;
+      _selectedIndex = newIndex;
+    });
+  }
+
+  void _onMethodRemove(AddressBookRecipientFormProvider formState, int index) {
+    final type = _selectedType ?? formState.supportedTypes.first;
+    formState.removeMethod(type, index);
+  }
+
+  void _onMethodChanged(
+    AddressBookRecipientFormProvider formState,
+    int index,
+    PaymentMethodData data,
+  ) {
+    final type = _selectedType ?? formState.supportedTypes.first;
+    formState.updateMethod(type, index, data);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final formState = context.watch<AddressBookRecipientFormProvider>();
+    _reconcileSelection(formState);
+
+    final selectedType = _selectedType ?? formState.supportedTypes.first;
+    return FormView(
+      formKey: widget.formKey,
+      nameCtrl: widget.nameCtrl,
+      emailCtrl: widget.emailCtrl,
+      types: formState.supportedTypes,
+      selectedType: selectedType,
+      selectedIndex: _selectedIndex,
+      methods: formState.methods,
+      onMethodSelected: _onMethodSelected,
+      onMethodAdd: (type) => _onMethodAdd(formState, type),
+      disabledTypes: disabledPaymentTypes,
+      onMethodRemove: (index) => _onMethodRemove(formState, index),
+      onMethodChanged: (index, data) => _onMethodChanged(formState, index, data),
+      onSave: () => widget.onSave(formState),
+      isEditing: widget.isEditing,
+      onBack: widget.onBack,
+    );
+  }
+}