refactor: 收口推荐流展示模型

src/components/rpg-entry/RpgEntryHomeView.tsx

@@ -150,8 +150,10 @@ import {
 } from './rpgEntryProfileTaskViewModel';
 import {
   buildPlatformRankingEntries,
+  buildPlatformRecommendFeedEntries,
   buildPublicCategoryGroups,
   buildPublicGalleryCardKey,
+  dedupePlatformPublicGalleryEntries,
   filterPlatformWorkSearchResults,
   filterTodayPublishedEntries,
   getAllPlatformPublicEntries,
@@ -167,6 +169,7 @@ import {
   type PlatformCategoryKindFilter,
   type PlatformCategorySortMode,
   type PlatformRankingTab,
+  selectPlatformRecommendFeedWindow,
   sortPlatformCategoryEntries,
 } from './rpgEntryPublicGalleryViewModel';
 import {
@@ -4742,14 +4745,11 @@ export function RpgEntryHomeView({
     featuredShelf.length > 0 ? featuredShelf : generalLatestEntries
   ).slice(0, 5);
   // 网页端保留原有宽屏布局，只把模块数据同步到移动端首页频道语义。
-  const desktopRecommendEntries = useMemo(() => {
-    const entryMap = new Map<string, PlatformPublicGalleryCard>();
-    [...featuredShelf, ...generalLatestEntries].forEach((entry) => {
-      entryMap.set(buildPublicGalleryCardKey(entry), entry);
-    });
-
-    return Array.from(entryMap.values());
-  }, [featuredShelf, generalLatestEntries]);
+  const recommendedFeedEntries = useMemo(
+    () => buildPlatformRecommendFeedEntries(featuredShelf, generalLatestEntries),
+    [featuredShelf, generalLatestEntries],
+  );
+  const desktopRecommendEntries = recommendedFeedEntries;
   const desktopTodayEntries = useMemo(
     () => filterTodayPublishedEntries(generalLatestEntries),
     [generalLatestEntries],
@@ -4757,35 +4757,18 @@ export function RpgEntryHomeView({
   const desktopFeaturedGrid = desktopRecommendEntries.slice(0, 4);
   const desktopCategoryGrid = activeCategoryEntries.slice(0, 6);
   const desktopLibraryPreview = myEntries.slice(0, 2);
-  const recommendedFeedEntries = useMemo(() => {
-    const entryMap = new Map<string, PlatformPublicGalleryCard>();
-    [...featuredShelf, ...generalLatestEntries].forEach((entry) => {
-      entryMap.set(buildPublicGalleryCardKey(entry), entry);
-    });
-
-    return Array.from(entryMap.values());
-  }, [featuredShelf, generalLatestEntries]);
   const discoverFeedEntries = useMemo(() => {
-    const entryMap = new Map<string, PlatformPublicGalleryCard>();
     const sourceEntries =
       discoverChannel === 'recommend'
         ? recommendedFeedEntries
         : filterTodayPublishedEntries(generalLatestEntries);
 
-    sourceEntries.forEach((entry) => {
-      entryMap.set(buildPublicGalleryCardKey(entry), entry);
-    });
-
-    return Array.from(entryMap.values());
+    return dedupePlatformPublicGalleryEntries(sourceEntries);
   }, [discoverChannel, generalLatestEntries, recommendedFeedEntries]);
-  const edutainmentFeedEntries = useMemo(() => {
-    const entryMap = new Map<string, PlatformPublicGalleryCard>();
-    edutainmentEntries.forEach((entry) => {
-      entryMap.set(buildPublicGalleryCardKey(entry), entry);
-    });
-
-    return Array.from(entryMap.values());
-  }, [edutainmentEntries]);
+  const edutainmentFeedEntries = useMemo(
+    () => dedupePlatformPublicGalleryEntries(edutainmentEntries),
+    [edutainmentEntries],
+  );
   const mobileFeedCarouselEnabled =
     !isDesktopLayout &&
     activeTab === 'category' &&
@@ -4883,41 +4866,24 @@ export function RpgEntryHomeView({
       buildPlatformRankingEntries(publicEntries, activeRankingTab).slice(0, 30),
     [activeRankingTab, publicEntries],
   );
-  const activeRecommendEntry =
-    recommendedFeedEntries.find(
-      (entry) => buildPublicGalleryCardKey(entry) === activeRecommendEntryKey,
-    ) ??
-    recommendedFeedEntries[0] ??
-    null;
-  const activeRecommendIndex = activeRecommendEntry
-    ? recommendedFeedEntries.findIndex(
-        (entry) =>
-          buildPublicGalleryCardKey(entry) ===
-          buildPublicGalleryCardKey(activeRecommendEntry),
-      )
-    : -1;
-  const previousRecommendEntry =
-    activeRecommendIndex >= 0 && recommendedFeedEntries.length > 1
-      ? recommendedFeedEntries[
-          (activeRecommendIndex - 1 + recommendedFeedEntries.length) %
-            recommendedFeedEntries.length
-        ]
-      : null;
-  const nextRecommendEntry =
-    activeRecommendIndex >= 0 && recommendedFeedEntries.length > 1
-      ? recommendedFeedEntries[
-          (activeRecommendIndex + 1) % recommendedFeedEntries.length
-        ]
-      : null;
+  const recommendFeedWindow = useMemo(
+    () =>
+      selectPlatformRecommendFeedWindow(
+        recommendedFeedEntries,
+        activeRecommendEntryKey,
+      ),
+    [activeRecommendEntryKey, recommendedFeedEntries],
+  );
+  const activeRecommendEntry = recommendFeedWindow.activeEntry;
+  const previousRecommendEntry = recommendFeedWindow.previousEntry;
+  const nextRecommendEntry = recommendFeedWindow.nextEntry;
   const [recommendDragOffsetY, setRecommendDragOffsetY] = useState(0);
   const [recommendDragCommitDirection, setRecommendDragCommitDirection] =
     useState<1 | -1 | null>(null);
   const [recommendShareState, setRecommendShareState] = useState<
     'idle' | 'copied' | 'failed'
   >('idle');
-  const activeRecommendEntryKeyForSelection = activeRecommendEntry
-    ? buildPublicGalleryCardKey(activeRecommendEntry)
-    : null;
+  const activeRecommendEntryKeyForSelection = recommendFeedWindow.activeEntryKey;
   const recommendShareResetTimerRef = useRef<number | null>(null);
   const recommendCardStageRef = useRef<HTMLDivElement | null>(null);
   const recommendDragStartRef = useRef<{