refactor(legacy-customer-service): move contact form state to provider (no setState)

modules/legacy/modules/customer_service/lib/src/presentation/contact_screen.dart

@@ -1,5 +1,6 @@
 import 'package:customer_service/src/domain/email_validator.dart';
 import 'package:customer_service/src/presentation/providers/contact_controller.dart';
+import 'package:customer_service/src/presentation/providers/contact_form_state_provider.dart';
 import 'package:design_system/design_system.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
@@ -24,9 +25,6 @@ class _ContactScreenState extends ConsumerState<ContactScreen> {
   late final TextEditingController _emailController;
   late final TextEditingController _subjectController;
   late final TextEditingController _bodyController;
-  String _country = '';
-  String _channel = '';
-  String? _localError;
 
   @override
   void initState() {
@@ -47,16 +45,16 @@ class _ContactScreenState extends ConsumerState<ContactScreen> {
   }
 
   void _onSend() {
+    final formNotifier = ref.read(contactFormProvider.notifier);
+    final formState = ref.read(contactFormProvider);
+
     final emailError = EmailValidator.validate(_emailController.text);
-    if (emailError != null) {
-      setState(() => _localError = emailError);
-      return;
-    }
-    setState(() => _localError = null);
+    formNotifier.setLocalError(emailError);
+    if (emailError != null) return;
 
     ref.read(contactControllerProvider.notifier).sendEmail(
-          country: _country,
-          channel: _channel,
+          country: formState.country,
+          channel: formState.channel,
           name: _nameController.text,
           email: _emailController.text.trim(),
           subject: _subjectController.text,
@@ -73,6 +71,7 @@ class _ContactScreenState extends ConsumerState<ContactScreen> {
     final isLoading = ref.watch(
       contactControllerProvider.select((s) => s.isLoading),
     );
+    final formState = ref.watch(contactFormProvider);
 
     return LegacyPageLayout(
       title: context.translate(I18n.contactTitle),
@@ -84,11 +83,11 @@ class _ContactScreenState extends ConsumerState<ContactScreen> {
           child: Column(
             children: [
               _CountrySection(
-                onChanged: (value) => setState(() => _country = value),
+                onChanged: ref.read(contactFormProvider.notifier).setCountry,
               ),
               SizedBox(height: SizeUtils.getByScreen(small: 18, big: 17)),
               _ChannelSection(
-                onChanged: (value) => setState(() => _channel = value),
+                onChanged: ref.read(contactFormProvider.notifier).setChannel,
               ),
               SizedBox(height: SizeUtils.getByScreen(small: 18, big: 17)),
               CustomTextField(
@@ -114,11 +113,11 @@ class _ContactScreenState extends ConsumerState<ContactScreen> {
                 lines: 8,
                 onSubmitted: (_) => _onSend(),
               ),
-              if (_localError != null)
+              if (formState.localError != null)
                 Padding(
                   padding: const EdgeInsets.only(top: 4),
                   child: Text(
-                    context.translate(_localError!),
+                    context.translate(formState.localError!),
                     textAlign: TextAlign.center,
                     style: TextStyle(
                       color: Theme.of(context).colorScheme.error,

modules/legacy/modules/customer_service/lib/src/presentation/providers/contact_form_state_provider.dart

@@ -0,0 +1,41 @@
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+part 'contact_form_state_provider.g.dart';
+
+class ContactFormState {
+  const ContactFormState({
+    this.country = '',
+    this.channel = '',
+    this.localError,
+  });
+
+  final String country;
+  final String channel;
+  final String? localError;
+
+  ContactFormState copyWith({
+    String? country,
+    String? channel,
+    String? localError,
+  }) {
+    return ContactFormState(
+      country: country ?? this.country,
+      channel: channel ?? this.channel,
+      localError: localError,
+    );
+  }
+}
+
+@riverpod
+class ContactForm extends _$ContactForm {
+  @override
+  ContactFormState build() => const ContactFormState();
+
+  void setCountry(String value) =>
+      state = state.copyWith(country: value, localError: state.localError);
+
+  void setChannel(String value) =>
+      state = state.copyWith(channel: value, localError: state.localError);
+
+  void setLocalError(String? error) => state = state.copyWith(localError: error);
+}

modules/legacy/modules/customer_service/lib/src/presentation/providers/contact_form_state_provider.g.dart

@@ -0,0 +1,63 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'contact_form_state_provider.dart';
+
+// **************************************************************************
+// RiverpodGenerator
+// **************************************************************************
+
+// GENERATED CODE - DO NOT MODIFY BY HAND
+// ignore_for_file: type=lint, type=warning
+
+@ProviderFor(ContactForm)
+const contactFormProvider = ContactFormProvider._();
+
+final class ContactFormProvider
+    extends $NotifierProvider<ContactForm, ContactFormState> {
+  const ContactFormProvider._()
+    : super(
+        from: null,
+        argument: null,
+        retry: null,
+        name: r'contactFormProvider',
+        isAutoDispose: true,
+        dependencies: null,
+        $allTransitiveDependencies: null,
+      );
+
+  @override
+  String debugGetCreateSourceHash() => _$contactFormHash();
+
+  @$internal
+  @override
+  ContactForm create() => ContactForm();
+
+  /// {@macro riverpod.override_with_value}
+  Override overrideWithValue(ContactFormState value) {
+    return $ProviderOverride(
+      origin: this,
+      providerOverride: $SyncValueProvider<ContactFormState>(value),
+    );
+  }
+}
+
+String _$contactFormHash() => r'995f52ca7d57da81833f6290f6c2bf2eaa043e47';
+
+abstract class _$ContactForm extends $Notifier<ContactFormState> {
+  ContactFormState build();
+  @$mustCallSuper
+  @override
+  void runBuild() {
+    final created = build();
+    final ref = this.ref as $Ref<ContactFormState, ContactFormState>;
+    final element =
+        ref.element
+            as $ClassProviderElement<
+              AnyNotifier<ContactFormState, ContactFormState>,
+              ContactFormState,
+              Object?,
+              Object?
+            >;
+    element.handleValue(ref, created);
+  }
+}