feat: 完成分龄页开发

2026-05-06 17:28:51 +08:00
parent 50394154f7
commit 9bdf850f20
54 changed files with 3499 additions and 1021 deletions
@@ -0,0 +1,156 @@
+const cloud = require('wx-server-sdk');
+
+cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV });
+
+const AGE_BANDS = {
+    '3-4': { minAge: 3, maxAge: 4 },
+    '4-5': { minAge: 4, maxAge: 5 },
+    '5-6': { minAge: 5, maxAge: 6 },
+    '6-7': { minAge: 6, maxAge: 7 },
+    '7-8': { minAge: 7, maxAge: 8 },
+};
+
+const DIFFICULTY_LABELS = {
+    1: '入门',
+    2: '基础',
+    3: '进阶',
+    4: '挑战',
+};
+
+function normalizeAgeKey(ageKey) {
+    const key = String(ageKey || '').trim();
+    return AGE_BANDS[key] ? key : null;
+}
+
+function ageBand(min, max) {
+    const minAge = Number(min) || 0;
+    const maxAge = Number(max) || 0;
+    return minAge && maxAge ? `${minAge}-${maxAge}岁` : '';
+}
+
+function difficultyLabel(difficulty) {
+    if (typeof difficulty === 'string') {
+        return difficulty;
+    }
+    return DIFFICULTY_LABELS[difficulty] || '基础';
+}
+
+function toRecommendedItem(ws) {
+    return {
+        worksheetId: ws._id,
+        title: ws.title || '',
+        subtitle: ws.subtitle || '',
+        previewImg: ws.previewImg || '',
+        ageBand: ageBand(ws.ageMin, ws.ageMax),
+        ageMin: Number(ws.ageMin) || 0,
+        ageMax: Number(ws.ageMax) || 0,
+        difficulty: difficultyLabel(ws.difficulty),
+        difficultyLabel: difficultyLabel(ws.difficulty),
+        path: ws.path || '',
+        downloads: Number(ws.downloads) || 0,
+        likes: Number(ws.likes) || 0,
+    };
+}
+
+function getAgeMin(ws) {
+    return Number(ws.ageMin) || 0;
+}
+
+function getAgeMax(ws) {
+    return Number(ws.ageMax) || 0;
+}
+
+function coversAgeBand(ws, band) {
+    return getAgeMin(ws) === band.minAge && getAgeMax(ws) >= band.maxAge;
+}
+
+function sortByField(items, field) {
+    return [...items].sort((a, b) => {
+        const fieldDiff = (Number(b[field]) || 0) - (Number(a[field]) || 0);
+        if (fieldDiff !== 0) return fieldDiff;
+        const aTime = a.updatedAt ? new Date(a.updatedAt).getTime() : 0;
+        const bTime = b.updatedAt ? new Date(b.updatedAt).getTime() : 0;
+        return bTime - aTime;
+    });
+}
+
+function pickTop(items, field, limit, excludeIds) {
+    if (limit <= 0) return [];
+
+    const picked = [];
+    for (const ws of sortByField(items, field)) {
+        if (excludeIds.has(ws._id)) continue;
+        picked.push(ws);
+        excludeIds.add(ws._id);
+        if (picked.length >= limit) break;
+    }
+    return picked;
+}
+
+async function queryActiveWorksheets(db) {
+    const { data } = await db
+        .collection('worksheets')
+        .where({
+            status: 'active',
+        })
+        .orderBy('downloads', 'desc')
+        .orderBy('updatedAt', 'desc')
+        .limit(100)
+        .get();
+
+    return data || [];
+}
+
+/**
+ * 入参：
+ * - ageKey: '3-4' | '4-5' | '5-6' | '6-7' | '7-8'
+ *
+ * 返回：
+ * - items: 优先返回 ageMin 等于目标下限且 ageMax 覆盖目标上限的 downloads Top3 + likes Top3，不足 6 个用全站 downloads Top 补足
+ */
+exports.main = async (event) => {
+    try {
+        const ageKey = normalizeAgeKey(event && event.ageKey);
+        if (!ageKey) {
+            return { success: false, message: 'ageKey 不合法' };
+        }
+
+        const band = AGE_BANDS[ageKey];
+        const db = cloud.database();
+        const activeWorksheets = await queryActiveWorksheets(db);
+        const matchedWorksheets = activeWorksheets.filter((ws) =>
+            coversAgeBand(ws, band),
+        );
+
+        const excludeIds = new Set();
+        const topDownloads = pickTop(
+            matchedWorksheets,
+            'downloads',
+            3,
+            excludeIds,
+        );
+        const topLikes = pickTop(matchedWorksheets, 'likes', 3, excludeIds);
+        const fallbackDownloads = pickTop(
+            activeWorksheets,
+            'downloads',
+            Math.max(0, 6 - topDownloads.length - topLikes.length),
+            excludeIds,
+        );
+
+        return {
+            success: true,
+            data: {
+                ageKey,
+                items: [...topDownloads, ...topLikes, ...fallbackDownloads]
+                    .slice(0, 6)
+                    .map(toRecommendedItem),
+            },
+        };
+    } catch (error) {
+        return {
+            success: false,
+            message:
+                error instanceof Error ? error.message : '获取分龄推荐失败',
+        };
+    }
+};