feature(registration): refactor

lib/features/registration/presentation/pages/registration_screen.dart

@@ -20,6 +20,7 @@ import 'package:eatvio_app/widgets/app_bar/appbar_title_image.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
+import 'package:validators/validators.dart';
 
 class RegistrationScreen extends StatefulWidget {
   const RegistrationScreen({super.key});
@@ -64,7 +65,6 @@ class _RegistrationScreenState extends State<RegistrationScreen> {
       create: (BuildContext context) => RegistrationCubit(),
       child: BlocBuilder<RegistrationCubit, RegistrationState>(
         builder: (BuildContext context, RegistrationState state) {
-          (state as RegistrationStateLoaded);
           return PopScope(
             canPop: false,
             onPopInvoked: (_) => _showPopDialog(),
@@ -112,12 +112,14 @@ class _RegistrationScreenState extends State<RegistrationScreen> {
                       ),
                       backgroundColor: appTheme.blueA400,
                       onPressed: () {
-                        setState(() {
-                          pageController.nextPage(
-                            duration: const Duration(milliseconds: 350),
-                            curve: Curves.easeInOut,
-                          );
-                        });
+                        if (canGoNext(state)) {
+                          setState(() {
+                            pageController.nextPage(
+                              duration: const Duration(milliseconds: 350),
+                              curve: Curves.easeInOut,
+                            );
+                          });
+                        }
                       },
                       label: Text(
                         'Продолжить',
@@ -169,21 +171,21 @@ class _RegistrationScreenState extends State<RegistrationScreen> {
                   });
                 },
                 children: [
-                  LanguageSelectScreen.builder(context),
-                  CredentialsScreen.builder(context, state.sheet),
-                  NameScreen.builder(context, state.sheet),
-                  GenderScreen.builder(context, state.sheet),
-                  DateOfBirthScreen.builder(context, state.sheet),
-                  CityOfLivingScreen.builder(context, state.sheet),
-                  BodyCircumferencesScreen.builder(context, state.sheet),
-                  WeightScreen.builder(context, state.sheet),
-                  HeightScreen.builder(context, state.sheet),
-                  BloodPressureScreen.builder(context, state.sheet),
-                  AllergiesScreen.builder(context, state.sheet),
-                  MedicineIntakeScreen.builder(context, state.sheet),
-                  FavoriteSportsScreen.builder(context, state.sheet),
-                  FavoriteFoodsScreen.builder(context, state.sheet),
-                  AdditionalInformationScreen.builder(context, state.sheet),
+                  LanguageSelectScreen(sheet: context.read<RegistrationCubit>().state.sheet),
+                  CredentialsScreen(sheet: context.read<RegistrationCubit>().state.sheet),
+                  NameScreen(),
+                  GenderScreen(),
+                  DateOfBirthScreen(),
+                  CityOfLivingScreen(),
+                  BodyCircumferencesScreen(),
+                  WeightScreen(),
+                  HeightScreen(),
+                  BloodPressureScreen(),
+                  AllergiesScreen(),
+                  MedicineIntakeScreen(),
+                  FavoriteSportsScreen(),
+                  FavoriteFoodsScreen(),
+                  AdditionalInformationScreen(),
                 ],
               ),
             ),
@@ -192,4 +194,71 @@ class _RegistrationScreenState extends State<RegistrationScreen> {
       ),
     );
   }
+
+  bool canGoNext(state) {
+    switch (step) {
+      case 2:
+        List<String> errors = validateFields(state.sheet.email, state.sheet.name, state.sheet.password, state.sheet.passwordConfirmation);
+        if (errors.isEmpty) {
+          return true;
+        } else {
+          String errorMessage = '';
+
+          for (var error in errors) {
+            errorMessage += error + '\n\n';
+          }
+
+          showDialog(
+            context: context,
+            builder: (context) => AlertDialog(
+              title: Text('Ошибка'),
+              content: Text(errorMessage),
+              actions: [
+                TextButton(
+                  onPressed: () => Navigator.pop(context),
+                  child: Text('OK'),
+                ),
+              ],
+            ),
+          );
+          return false;
+        }
+      default:
+        return true;
+    }
+  }
+
+  List<String> validateFields(String email, String name, String password, String passwordConfirmation) {
+    List<String> errors = [];
+
+    if (!isEmail(email)) {
+      errors.add('email_invalid'.tr);
+    }
+
+    if (email.isEmpty) {
+      errors.add('email_empty'.tr);
+    }
+
+    if (name.length < 6) {
+      errors.add('name_short'.tr);
+    }
+
+    if (name.isEmpty) {
+      errors.add('name_empty'.tr);
+    }
+
+    if (password.isEmpty) {
+      errors.add('name_empty'.tr);
+    }
+
+    if (password.length < 6) {
+      errors.add('password_short'.tr);
+    }
+
+    if (password != passwordConfirmation) {
+      errors.add('password_confirmation_mismatch'.tr);
+    }
+
+    return errors;
+  }
 }