feat(catalog): 新增分类推荐榜快照接口

fruitshorts-app-api/src/main/java/com/fruitshorts/app/controller/AppCatalogController.java

@@ -3,11 +3,13 @@
 package com.fruitshorts.app.controller;
 
 import com.fruitshorts.app.service.AppCatalogService;
+import com.fruitshorts.app.service.AppRankingService;
 import com.fruitshorts.app.vo.AppCategoryVO;
 import com.fruitshorts.app.vo.AppDramaPageReqVO;
 import com.fruitshorts.app.vo.AppFeedVO;
 import com.fruitshorts.app.vo.AppDramaCardVO;
 import com.fruitshorts.app.vo.AppPlaylistDetailVO;
+import com.fruitshorts.app.vo.AppRankingVO;
 import com.fruitshorts.common.pojo.CursorResult;
 import com.fruitshorts.common.pojo.PageResult;
 import com.fruitshorts.common.pojo.Result;
@@ -37,6 +39,7 @@ public class AppCatalogController {
     private static final int DRAMA_PAGE_SIZE = 20;
 
     private final AppCatalogService appCatalogService;
+    private final AppRankingService appRankingService;
 
     @Operation(summary = "首页聚合：轮播 + 分区，一次请求渲染整页")
     @GetMapping("/home/feed")
@@ -75,6 +78,12 @@ public class AppCatalogController {
         return Result.ok(appCatalogService.categoryDramas(id, pageIndex, pageSize));
     }
 
+    @Operation(summary = "推荐榜：按后台配置顺序返回榜单快照")
+    @GetMapping("/categories/{id}/ranking")
+    public Result<AppRankingVO> categoryRanking(@PathVariable Long id) {
+        return Result.ok(appRankingService.ranking(id));
+    }
+
     @Operation(summary = "已启用类型")
     @GetMapping("/drama-categories")
     public Result<List<AppCategoryVO>> dramaCategories() {

fruitshorts-app-api/src/main/java/com/fruitshorts/app/service/AppCatalogService.java

@@ -92,6 +92,11 @@ public class AppCatalogService {
                             c.getNameLocales(), c.getName(), c.getNameEn(), c.getNameId());
                     AppCategoryVO vo = new AppCategoryVO(c.getId(), ContentLocaleTexts.value(locales, ContentLocaleTexts.ZH));
                     vo.setLocales(locales);
+                    vo.setCode(c.getCode());
+                    vo.setLayoutType(c.getLayoutType() == null
+                            ? DramaClassificationService.LAYOUT_GRID
+                            : c.getLayoutType());
+                    vo.setRevision(c.getRevision() == null ? 1L : c.getRevision());
                     return vo;
                 })
                 .toList();

fruitshorts-app-api/src/main/java/com/fruitshorts/app/service/AppRankingService.java

@@ -0,0 +1,79 @@
+// Author: fruit.com.cn
+
+package com.fruitshorts.app.service;
+
+import com.fruitshorts.app.vo.AppDramaCardVO;
+import com.fruitshorts.app.vo.AppRankingEntryVO;
+import com.fruitshorts.app.vo.AppRankingVO;
+import com.fruitshorts.common.exception.ErrorCode;
+import com.fruitshorts.common.exception.ServiceException;
+import com.fruitshorts.content.dal.entity.Drama;
+import com.fruitshorts.content.service.ContentLocaleTexts;
+import com.fruitshorts.content.service.DramaClassificationService;
+import com.fruitshorts.content.service.DramaService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/** C 端推荐榜快照组装。 */
+@Service
+@RequiredArgsConstructor
+public class AppRankingService {
+
+    private static final int MAX_RANKING_ITEMS = 50;
+
+    private final DramaClassificationService classificationService;
+    private final DramaService dramaService;
+    private final AppCatalogService catalogService;
+
+    /** 过滤未上线短剧后保持后台位置，排名连续补齐。 */
+    public AppRankingVO ranking(Long classificationId) {
+        var classification = classificationService.getEnabledById(classificationId);
+        if (!DramaClassificationService.LAYOUT_RANKING.equals(classification.getLayoutType())) {
+            throw new ServiceException(ErrorCode.OPERATION_NOT_ALLOWED, "该分类不是推荐榜");
+        }
+        List<Long> ids = classificationService.listDramaIdsByClassification(classificationId);
+        List<Drama> ordered = orderedPublished(ids).stream().limit(MAX_RANKING_ITEMS).toList();
+        List<AppDramaCardVO> cards = catalogService.toCards(ordered);
+        List<AppRankingEntryVO> entries = entries(cards);
+        Map<String, String> locales = ContentLocaleTexts.read(
+                classification.getNameLocales(), classification.getName(),
+                classification.getNameEn(), classification.getNameId());
+        AppRankingVO ranking = new AppRankingVO();
+        ranking.setId(classification.getId());
+        ranking.setCode(classification.getCode());
+        ranking.setLocales(locales);
+        ranking.setRevision(classification.getRevision() == null ? 1L : classification.getRevision());
+        ranking.setGeneratedAt(classification.getUpdatedAt());
+        ranking.setTotal(entries.size());
+        ranking.setList(entries);
+        return ranking;
+    }
+
+    private List<AppRankingEntryVO> entries(List<AppDramaCardVO> cards) {
+        List<AppRankingEntryVO> entries = new ArrayList<>();
+        for (int index = 0; index < cards.size(); index++) {
+            entries.add(new AppRankingEntryVO(index + 1, cards.get(index)));
+        }
+        return entries;
+    }
+
+    private List<Drama> orderedPublished(List<Long> ids) {
+        if (ids.isEmpty()) {
+            return List.of();
+        }
+        Map<Long, Integer> positions = new HashMap<>();
+        for (int index = 0; index < ids.size(); index++) {
+            positions.put(ids.get(index), index);
+        }
+        return dramaService.listPublishedByIds(ids).stream()
+                .sorted((left, right) -> Integer.compare(
+                        positions.getOrDefault(left.getId(), Integer.MAX_VALUE),
+                        positions.getOrDefault(right.getId(), Integer.MAX_VALUE)))
+                .toList();
+    }
+}

fruitshorts-app-api/src/main/java/com/fruitshorts/app/vo/AppCategoryVO.java

@@ -11,10 +11,15 @@ import java.util.Map;
 public class AppCategoryVO {
 
     private Long id;
+    private String code;
+    private String layoutType;
+    private Long revision;
     private Map<String, String> locales;
 
     public AppCategoryVO(Long id, String name) {
         this.id = id;
+        this.layoutType = "GRID";
+        this.revision = 1L;
         this.locales = name == null || name.isBlank() ? Map.of() : Map.of("zh", name);
     }
 }

fruitshorts-app-api/src/main/java/com/fruitshorts/app/vo/AppRankingEntryVO.java

@@ -0,0 +1,15 @@
+// Author: fruit.com.cn
+
+package com.fruitshorts.app.vo;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+/** 推荐榜单项，排名由服务端确定。 */
+@Data
+@AllArgsConstructor
+public class AppRankingEntryVO {
+
+    private Integer rank;
+    private AppDramaCardVO drama;
+}

fruitshorts-app-api/src/main/java/com/fruitshorts/app/vo/AppRankingVO.java

@@ -0,0 +1,22 @@
+// Author: fruit.com.cn
+
+package com.fruitshorts.app.vo;
+
+import lombok.Data;
+
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.Map;
+
+/** 推荐榜快照。 */
+@Data
+public class AppRankingVO {
+
+    private Long id;
+    private String code;
+    private Map<String, String> locales;
+    private Long revision;
+    private LocalDateTime generatedAt;
+    private Integer total;
+    private List<AppRankingEntryVO> list;
+}