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yelaymaths_api/tools/legacy/build.ts

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+/**
+ * 把旧库数据编排成新库可直接写入的数据集。
+ *
+ * 逻辑集中在这里，migrate.ts（写库）与 transform.test.ts（校验）共用同一份实现，
+ * 避免两边各写一遍导致漂移。
+ */
+
+import { asString, type LegacyRows } from './load';
+import {
+  HOME_COURSE_TITLE_MAP,
+  transformArticle,
+  transformBanner,
+  transformCourse,
+  transformCourseTip,
+  transformEntitlement,
+  transformFreeLesson,
+  transformHomeCourse,
+  transformHomeFreeCourse,
+  transformLesson,
+  transformSetting,
+  transformUser,
+} from './transform';
+
+export type Dataset = ReturnType<typeof buildDataset>;
+
+export function buildDataset(db: LegacyRows, staticBase: string) {
+  // 先建课程，得到 code → 自增 id 的映射（新库 id 从 1 开始，与插入顺序一致）
+  const courses = db.课程口令码读取信息.map(transformCourse);
+  const courseIdByCode = new Map(courses.map((c, i) => [c.code, i + 1]));
+  const courseIdByTitle = new Map(courses.map((c, i) => [c.title, i + 1]));
+
+  const users = db.用户信息.map(transformUser);
+  const userIdByOpenid = new Map(users.map((u, i) => [u.openid, i + 1]));
+
+  const skippedLessonOrphans: string[] = [];
+  const lessons = db.视频课程数据.flatMap((row) => {
+    const courseId = courseIdByCode.get(asString(row.课程id));
+    if (!courseId) {
+      skippedLessonOrphans.push(asString(row.课程id));
+      return [];
+    }
+    return [transformLesson(row, courseId)];
+  });
+
+  // 权益：按 (user, course) 去重，重复的只保留第一条
+  const seen = new Set<string>();
+  const duplicateEntitlements: string[] = [];
+  const entitlements = db.用户已购课程.flatMap((row) => {
+    const userId = userIdByOpenid.get(asString(row.OpenID));
+    const courseId = courseIdByCode.get(asString(row.课程id));
+    if (!userId || !courseId) return [];
+    const key = `${userId}::${courseId}`;
+    if (seen.has(key)) {
+      duplicateEntitlements.push(key);
+      return [];
+    }
+    seen.add(key);
+    return [transformEntitlement(row, userId, courseId)];
+  });
+
+  const unmappedHomeCourses: string[] = [];
+  const homeCourses = db.首页课程列表.map((row) => {
+    const courseName = asString(row.课程名称);
+    const title = HOME_COURSE_TITLE_MAP[courseName];
+    const courseId = title ? courseIdByTitle.get(title) ?? null : null;
+    if (courseId === null) unmappedHomeCourses.push(courseName);
+    return transformHomeCourse(row, courseId, staticBase);
+  });
+
+  return {
+    courses,
+    users,
+    lessons,
+    entitlements,
+    homeCourses,
+    freeLessons: db.免费视频课程数据.map(transformFreeLesson),
+    homeFreeCourses: db.首页免费课程列表.map(transformHomeFreeCourse),
+    banners: db.首页横幅图片.map(transformBanner),
+    articles: db.网页列表.map((row) => transformArticle(row, staticBase)),
+    courseTips: db.课程页面Tips.map(transformCourseTip),
+    settings: db.cloudconfig
+      .map(transformSetting)
+      .filter((v): v is NonNullable<typeof v> => v !== null),
+    diagnostics: { skippedLessonOrphans, duplicateEntitlements, unmappedHomeCourses },
+  };
+}
+