feat: 사용자 프로필 수정 로직 추가

Author: MEOHIN

src/main/java/com/back/domain/profile/service/ProfileService.java

@@ -1,6 +1,7 @@
 package com.back.domain.profile.service;
 
 import com.back.domain.profile.dto.ProfileResponseDto;
+import com.back.domain.profile.dto.ProfileUpdateRequestDto;
 import com.back.domain.user.entity.User;
 import com.back.domain.user.repository.UserRepository;
 import com.back.domain.user.support.AbvView;
@@ -31,4 +32,31 @@ public ProfileResponseDto getProfile(Long id) {
                 .abvLabel(label)
                 .build();
     }
+
+    @Transactional
+    public ProfileResponseDto updateProfile(Long id, ProfileUpdateRequestDto profileUpdateRequestDto) {
+        User user = userRepository.findById(id).orElseThrow(() -> new ServiceException(404, "사용자를 찾을 수 없습니다."));
+
+        if (profileUpdateRequestDto.getNickname() != null) {
+            String nickname = profileUpdateRequestDto.getNickname().trim();
+            if (nickname.isEmpty() || nickname.length() > 10) {
+                throw new ServiceException(400, "닉네임은 1~10자");
+            }
+
+            if (userRepository.existsByNicknameAndIdNot(nickname, id)) {
+                throw new ServiceException(409, "이미 사용중인 닉네임");
+            }
+
+            user.setNickname(nickname);
+        }
+
+        if (profileUpdateRequestDto.getEmail() != null) {
+            String email = profileUpdateRequestDto.getEmail().trim();
+            user.setEmail(email.isEmpty() ? null : email);
+        }
+
+        userRepository.save(user);
+
+        return getProfile(id);
+    }
 }