feat: Top10 다이어리 조회 추가

Author: TTaiJin

src/main/java/com/example/log4u/domain/diary/controller/DiaryController.java

@@ -1,5 +1,7 @@
 package com.example.log4u.domain.diary.controller;
 
+import java.util.List;
+
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
@@ -18,6 +20,7 @@
 import com.example.log4u.domain.diary.SortType;
 import com.example.log4u.domain.diary.dto.DiaryRequestDto;
 import com.example.log4u.domain.diary.dto.DiaryResponseDto;
+import com.example.log4u.domain.diary.dto.PopularDiaryDto;
 import com.example.log4u.domain.diary.facade.DiaryFacade;
 
 import jakarta.validation.Valid;
@@ -106,4 +109,10 @@ public ResponseEntity<Void> deleteDiary(
 		diaryFacade.deleteDiary(customOAuth2User.getUserId(), diaryId);
 		return ResponseEntity.status(HttpStatus.NO_CONTENT).build();
 	}
+
+	@GetMapping("/popular")
+	public ResponseEntity<List<PopularDiaryDto>> getPopularDiaries() {
+		List<PopularDiaryDto> popularDiaries = diaryFacade.getPopularDiaries(10);
+		return ResponseEntity.ok(popularDiaries);
+	}
 }

src/main/java/com/example/log4u/domain/diary/dto/PopularDiaryDto.java

@@ -0,0 +1,18 @@
+package com.example.log4u.domain.diary.dto;
+
+import com.example.log4u.domain.diary.entity.Diary;
+
+import lombok.Builder;
+
+@Builder
+public record PopularDiaryDto(
+	Long diaryId,
+	String title
+) {
+	public static PopularDiaryDto of(Diary diary) {
+		return PopularDiaryDto.builder()
+			.diaryId(diary.getDiaryId())
+			.title(diary.getTitle())
+			.build();
+	}
+}

src/main/java/com/example/log4u/domain/diary/facade/DiaryFacade.java

@@ -10,6 +10,7 @@
 import com.example.log4u.domain.diary.SortType;
 import com.example.log4u.domain.diary.dto.DiaryRequestDto;
 import com.example.log4u.domain.diary.dto.DiaryResponseDto;
+import com.example.log4u.domain.diary.dto.PopularDiaryDto;
 import com.example.log4u.domain.diary.entity.Diary;
 import com.example.log4u.domain.diary.service.DiaryService;
 import com.example.log4u.domain.hashtag.service.HashtagService;
@@ -139,4 +140,16 @@ public PageResponse<DiaryResponseDto> searchDiariesByCursor(
 		Long nextCursor = !dtoSlice.isEmpty() ? dtoSlice.getContent().getLast().diaryId() : null;
 		return PageResponse.of(dtoSlice, nextCursor);
 	}
+
+	@Transactional(readOnly = true)
+	public List<PopularDiaryDto> getPopularDiaries(int limit) {
+		List<Diary> popularDiaries = diaryService.getTop10Diaries();
+
+		if (popularDiaries.isEmpty()) {
+			return List.of();
+		}
+		return popularDiaries.stream()
+			.map(PopularDiaryDto::of)
+			.toList();
+	}
 }

src/main/java/com/example/log4u/domain/diary/repository/DiaryRepository.java

@@ -1,8 +1,12 @@
 package com.example.log4u.domain.diary.repository;
 
+import java.util.List;
+
 import org.springframework.data.jpa.repository.JpaRepository;
 
+import com.example.log4u.domain.diary.VisibilityType;
 import com.example.log4u.domain.diary.entity.Diary;
 
 public interface DiaryRepository extends JpaRepository<Diary, Long>, CustomDiaryRepository {
+	List<Diary> findTop10ByVisibilityOrderByLikeCountDesc(VisibilityType visibility);
 }

src/main/java/com/example/log4u/domain/diary/service/DiaryService.java

@@ -273,4 +273,9 @@ public void checkDiaryExists(Long diaryId) {
 			throw new NotFoundDiaryException();
 		}
 	}
+
+	@Transactional(readOnly = true)
+	public List<Diary> getTop10Diaries() {
+		return diaryRepository.findTop10ByVisibilityOrderByLikeCountDesc(VisibilityType.PUBLIC);
+	}
 }

src/main/java/com/example/log4u/domain/media/service/MediaService.java

@@ -173,4 +173,25 @@ private void validateMediaLimit(List<MediaRequestDto> mediaList) {
 			throw new MediaLimitExceededException();
 		}
 	}
+
+	private boolean isMediaListUnchanged(List<Media> existingMediaList, List<MediaRequestDto> newMediaList) {
+		// 개수가 다르면 변경된 것
+		if (existingMediaList.size() != newMediaList.size()) {
+			return false;
+		}
+
+		Map<Long, Integer> existingMediaMap = existingMediaList.stream()
+			.collect(Collectors.toMap(Media::getMediaId, Media::getOrderIndex));
+
+		// 모든 새 미이더가 기존 미디어와 ID 및 순서가 동일한지 확인
+		for (MediaRequestDto newMedia : newMediaList) {
+			Integer existingOrder = existingMediaMap.get(newMedia.mediaId());
+
+			// ID가 없거나 순서가 다르면 변경된 것
+			if (existingOrder == null || !existingOrder.equals(newMedia.orderIndex())) {
+				return false;
+			}
+		}
+		return true;
+	}
 }