[feat] 프로필 조회 기능 구현 #16 (#20)

* feat: User엔티티에 JPA Auditing 적용

* feat: 프로필 요청 DTO 추가

* feat: ABV 레벨 및 퍼센트 라벨링 기능 추가

* feat: 닉네임 중복 확인 메서드 추가

* feat: 프로필 조회 로직 추가

* fix: 불필요한 필드 삭제

* feat: 로그인한 사용자 프로필 조회 API 추가

Author: MEOHIN

src/main/java/com/back/domain/profile/controller/ProfileController.java

@@ -0,0 +1,26 @@
+package com.back.domain.profile.controller;
+
+import com.back.domain.profile.dto.ProfileResponseDto;
+import com.back.domain.profile.service.ProfileService;
+import com.back.domain.user.service.UserService;
+import com.back.global.rsData.RsData;
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/me/profile")
+@RequiredArgsConstructor
+public class ProfileController {
+
+    private final UserService userService;
+    private final ProfileService profileService;
+
+    @GetMapping
+    public RsData<ProfileResponseDto> getProfile(@AuthenticationPrincipal(expression = "id") Long userId) {
+        ProfileResponseDto body = profileService.getProfile(userId);
+        return RsData.successOf(body); // code=200, message="success"
+    }
+}

src/main/java/com/back/domain/profile/dto/ProfileResponseDto.java

@@ -0,0 +1,18 @@
+package com.back.domain.profile.dto;
+
+import lombok.Builder;
+import lombok.Getter;
+
+@Getter
+@Builder
+public class ProfileResponseDto {
+    private Long id;
+    private String nickname;
+    private String email;
+
+    // 서버에 저장된 실제 값(0~100)
+    private Double abvDegree;      // 83.2
+    // 표현용(서버에서 계산)
+    private Integer abvLevel;      // 1~6
+    private String abvLabel;       // "83.2%"
+}

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

@@ -0,0 +1,34 @@
+package com.back.domain.profile.service;
+
+import com.back.domain.profile.dto.ProfileResponseDto;
+import com.back.domain.user.entity.User;
+import com.back.domain.user.repository.UserRepository;
+import com.back.domain.user.support.AbvView;
+import com.back.global.exception.ServiceException;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@RequiredArgsConstructor
+public class ProfileService {
+
+    private final UserRepository userRepository;
+
+    @Transactional(readOnly = true)
+    public ProfileResponseDto getProfile(Long id) {
+        User user = userRepository.findById(id).orElseThrow(() -> new ServiceException(404, "사용자를 찾을 수 없습니다."));
+
+        Double percent = user.getAbvDegree();
+        int level = AbvView.levelOf(percent);
+        String label = AbvView.percentLabel(percent);
+
+        return ProfileResponseDto.builder()
+                .id(user.getId())
+                .nickname(user.getNickname())
+                .abvDegree(percent)
+                .abvLevel(level)
+                .abvLabel(label)
+                .build();
+    }
+}

src/main/java/com/back/domain/user/entity/User.java

@@ -4,6 +4,8 @@
 import lombok.*;
 import org.springframework.security.core.GrantedAuthority;
 import org.springframework.security.core.authority.SimpleGrantedAuthority;
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.annotation.LastModifiedDate;
 
 import java.time.LocalDateTime;
 import java.util.ArrayList;
@@ -33,16 +35,18 @@ public class User {
 
     private Double abvDegree;   // 알콜도수(회원 등급)
 
+    @CreatedDate    // JPA Auditing 적용
+    @Column(nullable = false, updatable = false)
     private LocalDateTime createdAt;   // 생성 날짜
 
+    @LastModifiedDate    // JPA Auditing 적용
+    @Column(nullable = false)
     private LocalDateTime updatedAt;   // 수정 날짜
 
     @Builder.Default
     @Column(nullable = false, length = 20)
     private String role = "USER";
 
-    private String profileImgUrl;
-
     public boolean isAdmin() {
         return "ADMIN".equalsIgnoreCase(role);
     }

src/main/java/com/back/domain/user/repository/UserRepository.java

@@ -6,5 +6,6 @@
 
 @Repository
 public interface UserRepository extends JpaRepository<User, Long> {
+    boolean existsByNicknameAndIdNot(String nickname, Long id);
 }
 

src/main/java/com/back/domain/user/support/AbvView.java

@@ -0,0 +1,28 @@
+package com.back.domain.user.support;
+
+public final class AbvView {
+
+    private AbvView(){}
+
+    // 0~100%를 6단계로 매핑
+    public static int levelOf(Double percent) {
+        if (percent == null) return 1;
+
+        double x = Math.max(0, Math.min(100, percent));
+        int p = (int) x;
+
+        if (p <= 10) return 1;      // 0~10
+        if (p <= 25) return 2;      // 11~25
+        if (p <= 45) return 3;      // 26~45
+        if (p <= 65) return 4;      // 46~65
+        if (p <= 85) return 5;      // 66~85
+        return 6;                   // 86~100
+    }
+
+    // 화면용 "23.5%" 라벨
+    public static String percentLabel(Double percent) {
+        if (percent == null) return "0%";
+        double x = Math.max(0.0, Math.min(100.0, percent));
+        return (x % 1.0 == 0.0) ? String.format("%.0f%%", x) : String.format("%.1f%%", x);
+    }
+}