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