feat: 탐색 페이지 트랜딩 리스트 조회 API 구현 (#74)

* style: 패키지 구조 변경 (#74)

* feat: 탐색 페이지 트랜딩 리스트 조회 API 구현 (#74)

* refactor: 트랜딩에 ownerId 추가 및 정렬 기준 변경 (#74)

* style: 패키지 구조 변경 (#74)

* refactor: 비지니스로직 부분 service 단에서 처리하도록 변경 (#74)

src/main/java/com/listywave/image/application/service/ImageService.java

@@ -15,7 +15,7 @@
 import com.listywave.list.application.domain.Item;
 import com.listywave.list.application.domain.Lists;
 import com.listywave.list.repository.ItemRepository;
-import com.listywave.list.repository.ListRepository;
+import com.listywave.list.repository.list.ListRepository;
 import com.listywave.user.application.domain.User;
 import java.util.Arrays;
 import java.util.Date;

src/main/java/com/listywave/list/application/domain/Lists.java

@@ -26,6 +26,7 @@
 import jakarta.persistence.Table;
 import java.time.LocalDateTime;
 import java.util.ArrayList;
+import java.util.Comparator;
 import java.util.List;
 import lombok.AccessLevel;
 import lombok.AllArgsConstructor;
@@ -162,6 +163,10 @@ public static Lists createList(
         return lists;
     }
 
+    public void sortItems() {
+        this.getItems().sort(Comparator.comparing(Item::getRanking));
+    }
+
     public String getCategoryName() {
         return category.name();
     }

src/main/java/com/listywave/list/presentation/dto/response/CategoryTypeResponse.java → src/main/java/com/listywave/list/application/dto/response/CategoryTypeResponse.java

@@ -1,4 +1,4 @@
-package com.listywave.list.presentation.dto.response;
+package com.listywave.list.application.dto.response;
 
 import com.listywave.list.application.domain.CategoryType;
 
@@ -10,9 +10,9 @@ public record CategoryTypeResponse(
 
     public static CategoryTypeResponse fromEnum(CategoryType categoryType) {
         return new CategoryTypeResponse(
-            categoryType.getCodeValue(),
-            categoryType.name().toLowerCase(),
-            categoryType.getKorNameValue()
+                categoryType.getCodeValue(),
+                categoryType.name().toLowerCase(),
+                categoryType.getKorNameValue()
         );
     }
 }

src/main/java/com/listywave/list/presentation/dto/response/ListCreateResponse.java → src/main/java/com/listywave/list/application/dto/response/ListCreateResponse.java

@@ -1,6 +1,6 @@
-package com.listywave.list.presentation.dto.response;
+package com.listywave.list.application.dto.response;
 
-public record ListCreateResponse(Long listId){
+public record ListCreateResponse(Long listId) {
 
     public static ListCreateResponse of(Long id) {
         return new ListCreateResponse(

src/main/java/com/listywave/list/application/dto/response/ListTrandingResponse.java

@@ -0,0 +1,25 @@
+package com.listywave.list.application.dto.response;
+
+import com.listywave.list.application.domain.Lists;
+import lombok.Builder;
+
+@Builder
+public record ListTrandingResponse(
+        Long id,
+        Long ownerId,
+        String title,
+        String description,
+        String itemImageUrl,
+        String backgroundColor
+) {
+    public static ListTrandingResponse of(Lists list, String imageUrlTopRankItem) {
+        return ListTrandingResponse.builder()
+                .id(list.getId())
+                .ownerId(list.getUser().getId())
+                .title(list.getTitle())
+                .description(list.getDescription())
+                .itemImageUrl(imageUrlTopRankItem)
+                .backgroundColor(list.getBackgroundColor())
+                .build();
+    }
+}

src/main/java/com/listywave/list/application/service/CommentService.java

@@ -10,8 +10,8 @@
 import com.listywave.list.application.dto.response.CommentCreateResponse;
 import com.listywave.list.application.dto.response.CommentFindResponse;
 import com.listywave.list.repository.CommentRepository;
-import com.listywave.list.repository.ListRepository;
 import com.listywave.list.repository.ReplyRepository;
+import com.listywave.list.repository.list.ListRepository;
 import com.listywave.user.application.domain.User;
 import com.listywave.user.repository.user.UserRepository;
 import jakarta.transaction.Transactional;

src/main/java/com/listywave/list/application/service/ListService.java

@@ -5,19 +5,21 @@
 import com.listywave.common.exception.CustomException;
 import com.listywave.common.exception.ErrorCode;
 import com.listywave.common.util.UserUtil;
+import com.listywave.list.application.domain.Item;
 import com.listywave.list.application.domain.Lists;
 import com.listywave.list.application.dto.ListCreateCommand;
+import com.listywave.list.application.dto.response.ListCreateResponse;
 import com.listywave.list.application.dto.response.ListDetailResponse;
+import com.listywave.list.application.dto.response.ListTrandingResponse;
 import com.listywave.list.presentation.dto.request.ItemCreateRequest;
-import com.listywave.list.presentation.dto.response.ListCreateResponse;
-import com.listywave.list.repository.ListRepository;
+import com.listywave.list.repository.list.ListRepository;
 import com.listywave.user.application.domain.User;
 import com.listywave.user.repository.user.UserRepository;
-import jakarta.transaction.Transactional;
 import java.util.List;
 import java.util.stream.Collectors;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 
 @Service
 @Transactional
@@ -63,6 +65,7 @@ public ListCreateResponse listCreate(
         return ListCreateResponse.of(list.getId());
     }
 
+
     private List<User> findExistingCollaborators(List<Long> collaboratorIds) {
         List<User> existingCollaborators = userRepository.findAllById(collaboratorIds);
 
@@ -111,4 +114,22 @@ public ListDetailResponse getListDetail(Long listId, String accessToken) {
         }
         return ListDetailResponse.of(list, list.getUser(), true, collaborators);
     }
+
+    @Transactional(readOnly = true)
+    public List<ListTrandingResponse> getTrandingList() {
+        List<Lists> lists = listRepository.findTrandingLists();
+        lists.forEach(Lists::sortItems); // <-- 추가 !
+        return lists.stream()
+                .map(list -> ListTrandingResponse.of(list, getImageUrlTopRankItem(list.getItems())))
+                .toList();
+    }
+
+    private String getImageUrlTopRankItem(List<Item> items) {
+        return items.stream()
+                .map(Item::getImageUrl)
+                .filter(url -> !url.isEmpty())
+                .findFirst()
+                .orElse("");
+    }
+
 }

src/main/java/com/listywave/list/application/service/ReplyService.java

@@ -7,8 +7,8 @@
 import com.listywave.list.application.dto.response.ReplyCreateResponse;
 import com.listywave.list.application.vo.Content;
 import com.listywave.list.repository.CommentRepository;
-import com.listywave.list.repository.ListRepository;
 import com.listywave.list.repository.ReplyRepository;
+import com.listywave.list.repository.list.ListRepository;
 import com.listywave.user.application.domain.User;
 import com.listywave.user.repository.user.UserRepository;
 import lombok.RequiredArgsConstructor;

src/main/java/com/listywave/list/presentation/controller/CategoryController.java

@@ -1,7 +1,7 @@
 package com.listywave.list.presentation.controller;
 
 import com.listywave.list.application.domain.CategoryType;
-import com.listywave.list.presentation.dto.response.CategoryTypeResponse;
+import com.listywave.list.application.dto.response.CategoryTypeResponse;
 import java.util.Arrays;
 import java.util.List;
 import java.util.stream.Collectors;

src/main/java/com/listywave/list/presentation/controller/ListController.java

@@ -1,10 +1,12 @@
 package com.listywave.list.presentation.controller;
 
 import com.listywave.list.application.dto.ListCreateCommand;
+import com.listywave.list.application.dto.response.ListCreateResponse;
 import com.listywave.list.application.dto.response.ListDetailResponse;
+import com.listywave.list.application.dto.response.ListTrandingResponse;
 import com.listywave.list.application.service.ListService;
 import com.listywave.list.presentation.dto.request.ListCreateRequest;
-import com.listywave.list.presentation.dto.response.ListCreateResponse;
+import java.util.List;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
@@ -43,4 +45,10 @@ ResponseEntity<ListDetailResponse> getListDetail(
         ListDetailResponse listDetailResponse = listService.getListDetail(listId, accessToken);
         return ResponseEntity.ok(listDetailResponse);
     }
+
+    @GetMapping("/explore")
+    ResponseEntity<List<ListTrandingResponse>> getTrandingList() {
+        List<ListTrandingResponse> trandingList = listService.getTrandingList();
+        return ResponseEntity.ok().body(trandingList);
+    }
 }

src/main/java/com/listywave/list/repository/ListRepository.java → src/main/java/com/listywave/list/repository/list/ListRepository.java

@@ -1,12 +1,13 @@
-package com.listywave.list.repository;
+package com.listywave.list.repository.list;
 
 import static com.listywave.common.exception.ErrorCode.NOT_FOUND;
 
 import com.listywave.common.exception.CustomException;
 import com.listywave.list.application.domain.Lists;
+import com.listywave.list.repository.list.custom.CustomListRepository;
 import org.springframework.data.jpa.repository.JpaRepository;
 
-public interface ListRepository extends JpaRepository<Lists, Long> {
+public interface ListRepository extends JpaRepository<Lists, Long>, CustomListRepository {
 
     default Lists getById(Long listId) {
         return findById(listId).orElseThrow(() -> new CustomException(NOT_FOUND));

src/main/java/com/listywave/list/repository/list/custom/CustomListRepository.java

@@ -0,0 +1,9 @@
+package com.listywave.list.repository.list.custom;
+
+import com.listywave.list.application.domain.Lists;
+import java.util.List;
+
+public interface CustomListRepository {
+
+    List<Lists> findTrandingLists();
+}

src/main/java/com/listywave/list/repository/list/custom/impl/CustomListRepositoryImpl.java

@@ -0,0 +1,35 @@
+package com.listywave.list.repository.list.custom.impl;
+
+import static com.listywave.list.application.domain.QItem.item;
+import static com.listywave.list.application.domain.QLists.lists;
+
+import com.listywave.list.application.domain.Item;
+import com.listywave.list.application.domain.Lists;
+import com.listywave.list.repository.list.custom.CustomListRepository;
+import com.querydsl.jpa.impl.JPAQueryFactory;
+import java.util.Comparator;
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+public class CustomListRepositoryImpl implements CustomListRepository {
+
+    private final JPAQueryFactory queryFactory;
+
+    @Override
+    public List<Lists> findTrandingLists() {
+        List<Lists> fetch = queryFactory
+                .selectFrom(lists)
+                .leftJoin(lists.items, item)
+                .distinct()
+                .limit(10)
+                .orderBy(lists.collectCount.desc(), lists.viewCount.desc())
+                .fetch();
+
+        fetch.forEach(
+                list -> list.getItems()
+                        .sort(Comparator.comparing(Item::getRanking))
+        );
+        return fetch;
+    }
+}