fix: 필요 없는 코드 수정

frontend/ongi/lib/screens/signup/familycode_create_screen.dart

@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:ongi/core/app_colors.dart';
 import 'package:ongi/screens/signup/ready_screen.dart';
 import 'package:shared_preferences/shared_preferences.dart';
-import 'package:ongi/services/auth_service.dart';
+import 'package:ongi/services/code_service.dart';
 
 class FamilycodeCreateScreen extends StatefulWidget {
   const FamilycodeCreateScreen({super.key});
@@ -13,44 +13,38 @@ class FamilycodeCreateScreen extends StatefulWidget {
 
 class _FamilycodeCreateScreenState extends State<FamilycodeCreateScreen> {
   final TextEditingController _familycodeCtrl = TextEditingController();
+  bool _isCodeGenerated = false;
 
   Future<void> _handleSubmit() async {
-    final familyCode = _familycodeCtrl.text.trim();
-
+    if (_isCodeGenerated) {
+      Navigator.push(
+        context,
+        MaterialPageRoute(builder: (context) => const ReadyScreen()),
+      );
+      return;
+    }
 
     try {
       final prefs = await SharedPreferences.getInstance();
-      final email = prefs.getString('signup_email') ?? '';
-      final password = prefs.getString('signup_password') ?? '';
-      final name = prefs.getString('signup_username') ?? '';
-      final isParent = prefs.getString('user_mode') == 'parent';
+      final familyName = prefs.getString('family_name') ?? '';
+
+      final codeService = CodeService();
+      final response = await codeService.familyCreate(name: familyName);
 
-      if (email.isEmpty || password.isEmpty || name.isEmpty) {
+      final code = response['code'];
+      if (code != null) {
+        setState(() {
+          _familycodeCtrl.text = code;
+          _isCodeGenerated = true;
+        });
+      } else {
         ScaffoldMessenger.of(context).showSnackBar(
-          const SnackBar(content: Text('회원가입 정보가 올바르지 않습니다')),
+          const SnackBar(content: Text('코드 생성에 실패했습니다.')),
         );
-        return;
       }
-
-      final authService = AuthService();
-      await authService.register(
-        email: email,
-        password: password,
-        name: name,
-        isParent: isParent,
-      );
-
-      // 회원가입 성공 후 준비 완료 화면으로 이동
-      if (!mounted) return;
-      Navigator.push(
-        context,
-        MaterialPageRoute(
-          builder: (context) => const ReadyScreen(),
-        ),
-      );
     } catch (e) {
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('회원가입 실패: $e')),
+        SnackBar(content: Text('코드 생성 실패: $e')),
       );
     }
   }
@@ -116,6 +110,7 @@ class _FamilycodeCreateScreenState extends State<FamilycodeCreateScreen> {
               padding: const EdgeInsets.only(left: 40, right: 40, top: 40),
               child: TextField(
                 controller: _familycodeCtrl,
+                readOnly: true,
                 keyboardType: TextInputType.text,
                 style: const TextStyle(
                   fontSize: 25,
@@ -159,9 +154,9 @@ class _FamilycodeCreateScreenState extends State<FamilycodeCreateScreen> {
                     ),
                   ),
                   onPressed: _handleSubmit,
-                  child: const Text(
-                    '생성하기',
-                    style: TextStyle(
+                  child: Text(
+                    _isCodeGenerated ? '함께하기' : '생성하기',
+                    style: const TextStyle(
                       fontSize: 33,
                       fontWeight: FontWeight.w400,
                       color: Colors.white,

frontend/ongi/lib/screens/signup/familycode_screen.dart

@@ -1,8 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:ongi/core/app_colors.dart';
 import 'package:ongi/screens/signup/ready_screen.dart';
-import 'package:shared_preferences/shared_preferences.dart';
-import 'package:ongi/services/auth_service.dart';
+import 'package:ongi/services/family_join_service.dart';
 
 class FamilycodeScreen extends StatefulWidget {
   const FamilycodeScreen({super.key});
@@ -13,50 +12,49 @@ class FamilycodeScreen extends StatefulWidget {
 
 class _FamilycodeScreenState extends State<FamilycodeScreen> {
   final TextEditingController _familycodeCtrl = TextEditingController();
+  final FamilyJoinService _familyJoinService = FamilyJoinService();
+  bool _isLoading = false;
+
+  void _showErrorSnackBar(String message) {
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        content: Text(
+          message,
+          style: const TextStyle(color: AppColors.ongiOrange),
+        ),
+        backgroundColor: Colors.white,
+        behavior: SnackBarBehavior.floating,
+        shape: RoundedRectangleBorder(
+          borderRadius: BorderRadius.circular(20),
+        ),
+        duration: const Duration(seconds: 2),
+      ),
+    );
+  }
 
   Future<void> _handleSubmit() async {
     final familyCode = _familycodeCtrl.text.trim();
     if (familyCode.isEmpty) {
-      ScaffoldMessenger.of(context).showSnackBar(
-        const SnackBar(content: Text('가족 코드를 입력해주세요')),
-      );
+      _showErrorSnackBar('가족코드를 입력해주세요.');
       return;
     }
 
-    try {
-      final prefs = await SharedPreferences.getInstance();
-      final email = prefs.getString('signup_email') ?? '';
-      final password = prefs.getString('signup_password') ?? '';
-      final name = prefs.getString('signup_username') ?? '';
-      final isParent = prefs.getString('user_mode') == 'parent';
-
-      if (email.isEmpty || password.isEmpty || name.isEmpty) {
-        ScaffoldMessenger.of(context).showSnackBar(
-          const SnackBar(content: Text('회원가입 정보가 올바르지 않습니다')),
-        );
-        return;
-      }
+    setState(() {
+      _isLoading = true;
+    });
 
-      final authService = AuthService();
-      await authService.register(
-        email: email,
-        password: password,
-        name: name,
-        isParent: isParent,
-      );
-
-      // 회원가입 성공 후 준비 완료 화면으로 이동
-      if (!mounted) return;
-      Navigator.push(
+    try {
+      final result = await _familyJoinService.familyJoin(code: familyCode);
+      Navigator.pushReplacement(
         context,
-        MaterialPageRoute(
-          builder: (context) => const ReadyScreen(),
-        ),
+        MaterialPageRoute(builder: (context) => const ReadyScreen()),
       );
     } catch (e) {
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('회원가입 실패: $e')),
-      );
+      _showErrorSnackBar('존재하지 않는 가족이에요.');
+    } finally {
+      setState(() {
+        _isLoading = false;
+      });
     }
   }
 
@@ -163,15 +161,17 @@ class _FamilycodeScreenState extends State<FamilycodeScreen> {
                       borderRadius: BorderRadius.circular(20),
                     ),
                   ),
-                  onPressed: _handleSubmit,
-                  child: const Text(
-                    '입력하기',
-                    style: TextStyle(
-                      fontSize: 33,
-                      fontWeight: FontWeight.w400,
-                      color: Colors.white,
-                    ),
-                  ),
+                  onPressed: _isLoading ? null : _handleSubmit,
+                  child: _isLoading
+                      ? const CircularProgressIndicator(color: AppColors.ongiOrange)
+                      : const Text(
+                          '입력하기',
+                          style: TextStyle(
+                            fontSize: 33,
+                            fontWeight: FontWeight.w400,
+                            color: Colors.white,
+                          ),
+                        ),
                 ),
               ),
             ),

frontend/ongi/lib/screens/signup/familyname_screen.dart

@@ -3,7 +3,6 @@ import 'package:ongi/core/app_colors.dart';
 import 'package:ongi/screens/signup/familycode_screen.dart';
 import 'package:ongi/screens/signup/familycode_create_screen.dart';
 import 'package:shared_preferences/shared_preferences.dart';
-import 'package:ongi/services/auth_service.dart';
 
 class FamilynameScreen extends StatefulWidget {
   const FamilynameScreen({super.key});
@@ -20,32 +19,25 @@ class _FamilynameScreenState extends State<FamilynameScreen> {
     final familyName = _familynameCtrl.text.trim();
     if (familyName.isEmpty) {
       ScaffoldMessenger.of(context).showSnackBar(
-        const SnackBar(content: Text('가족 이름을 입력해주세요')),
+        SnackBar(
+          content: const Text(
+            '가족이름을 입력해주세요.',
+            style: TextStyle(color: AppColors.ongiOrange),
+          ),
+          backgroundColor: Colors.white,
+          behavior: SnackBarBehavior.floating,
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(20),
+          ),
+          duration: const Duration(seconds: 2),
+        ),
       );
       return;
     }
 
     try {
       final prefs = await SharedPreferences.getInstance();
-      final email = prefs.getString('signup_email') ?? '';
-      final password = prefs.getString('signup_password') ?? '';
-      final name = prefs.getString('signup_username') ?? '';
-      final isParent = prefs.getString('user_mode') == 'parent';
-
-      if (email.isEmpty || password.isEmpty || name.isEmpty) {
-        ScaffoldMessenger.of(context).showSnackBar(
-          const SnackBar(content: Text('회원가입 정보가 올바르지 않습니다')),
-        );
-        return;
-      }
-
-      final authService = AuthService();
-      await authService.register(
-        email: email,
-        password: password,
-        name: name,
-        isParent: isParent,
-      );
+      await prefs.setString('family_name', familyName);
 
       if (!mounted) return;
       Navigator.push(
@@ -56,7 +48,7 @@ class _FamilynameScreenState extends State<FamilynameScreen> {
       );
     } catch (e) {
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('회원가입 실패: $e')),
+        SnackBar(content: Text('오류가 발생했습니다: $e')),
       );
     }
   }
@@ -119,41 +111,7 @@ class _FamilynameScreenState extends State<FamilynameScreen> {
               ),
             ),
             Padding(
-
-              padding: const EdgeInsets.only(left: 40, right: 40, top: 40),
-              child: Row(
-                children: [
-                  Checkbox(
-                    value: _isChecked,
-                    activeColor: AppColors.ongiOrange,
-                    onChanged: (bool? value) {
-                      if (value == null) return;
-                      setState(() => _isChecked = value);
-
-                      if (value) {
-                        Navigator.push(
-                          context,
-                          MaterialPageRoute(
-                            builder: (_) => const FamilycodeScreen(),
-                          ),
-                        ).then((_) => setState(() => _isChecked = false));
-                      }
-                    },
-                  ),
-                  const Text(
-                    '이미 가입한 가족이 있어요!',
-                    style: TextStyle(
-                      fontSize: 20,
-                      fontWeight: FontWeight.w400,
-                      height: 1.2,
-                      color: AppColors.ongiOrange,
-                    ),
-                  ),
-                ],
-              ),
-            ),
-            Padding(
-              padding: const EdgeInsets.only(left: 40, right: 40, top: 5),
+              padding: const EdgeInsets.only(left: 40, right: 40, top: 30),
               child: TextField(
                 controller: _familynameCtrl,
                 keyboardType: TextInputType.text,