fix0806: APP端去掉全部的市辖区选择

hejianhao

2026-08-28 16a57a8fc6868cea9171a1119698572407a2fc03

 tcm-training-admin-backend/src/main/java/com/tcm/training/admin/app/course/service/AppHealthCourseService.java

@@ -1,21 +1,71 @@
package com.tcm.training.admin.app.course.service;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.tcm.training.admin.app.auth.service.AppAuthSessionService;
import com.tcm.training.admin.app.course.dto.AppHealthCourseDownloadBatchDeleteRequest;
import com.tcm.training.admin.app.course.dto.AppHealthCourseDownloadReportRequest;
import com.tcm.training.admin.app.course.dto.AppHealthCourseFavoriteBatchCancelRequest;
import com.tcm.training.admin.app.course.dto.AppHealthCoursePlayRecordUploadRequest;
import com.tcm.training.admin.app.course.dto.AppHealthCoursePurchaseRequest;
import com.tcm.training.admin.app.course.vo.AppHealthCourseCategoryOptionVO;
import com.tcm.training.admin.app.course.vo.AppHealthCourseDetailVO;
import com.tcm.training.admin.app.course.vo.AppHealthCourseDownloadItemVO;
import com.tcm.training.admin.app.course.vo.AppHealthCourseExpertVO;
import com.tcm.training.admin.app.course.vo.AppHealthCourseFavoriteItemVO;
import com.tcm.training.admin.app.course.vo.AppHealthCourseFavoriteResultVO;
import com.tcm.training.admin.app.course.vo.AppHealthCourseListItemVO;
import com.tcm.training.admin.app.course.vo.AppHealthCoursePlayRecordUploadResultVO;
import com.tcm.training.admin.app.course.vo.AppHealthCoursePurchaseResultVO;
import com.tcm.training.admin.app.course.vo.AppHealthCourseVideoVO;
import com.tcm.training.admin.app.course.vo.AppMyHealthCourseDetailVO;
import com.tcm.training.admin.app.course.vo.AppMyHealthCourseItemVO;
import com.tcm.training.admin.app.course.vo.AppMyHealthCourseVideoItemVO;
import com.tcm.training.admin.live.entity.CoursePurchaseOrder;
import com.tcm.training.admin.live.entity.Expert;
import com.tcm.training.admin.live.entity.HealthCourse;
import com.tcm.training.admin.live.entity.HealthCourseDownloadRecord;
import com.tcm.training.admin.live.entity.HealthCourseFavoriteRecord;
import com.tcm.training.admin.live.entity.HealthCourseMemberJoinRecord;
import com.tcm.training.admin.live.entity.HealthCoursePlayRecord;
import com.tcm.training.admin.live.entity.HealthCourseVideo;
import com.tcm.training.admin.live.entity.LiveCourseCategory;
import com.tcm.training.admin.live.mapper.CoursePurchaseOrderMapper;
import com.tcm.training.admin.live.mapper.ExpertMapper;
import com.tcm.training.admin.live.mapper.HealthCourseDownloadRecordMapper;
import com.tcm.training.admin.live.mapper.HealthCourseFavoriteRecordMapper;
import com.tcm.training.admin.live.mapper.HealthCourseMapper;
import com.tcm.training.admin.live.mapper.HealthCourseMemberJoinRecordMapper;
import com.tcm.training.admin.live.mapper.HealthCoursePlayRecordMapper;
import com.tcm.training.admin.live.mapper.HealthCourseVideoMapper;
import com.tcm.training.admin.live.mapper.LiveCourseCategoryMapper;
import com.tcm.training.admin.live.row.AppHealthCourseDownloadRow;
import com.tcm.training.admin.live.row.AppHealthCourseFavoriteRow;
import com.tcm.training.admin.live.row.AppMyHealthCourseProgressRow;
import com.tcm.training.admin.live.row.AppMyHealthCourseVideoProgressRow;
import com.tcm.training.admin.live.service.HealthCourseAppService;
import com.tcm.training.admin.live.service.LiveCourseCategoryAppService;
import com.tcm.training.admin.live.vo.HealthCourseDetailVO;
import com.tcm.training.admin.live.vo.HealthCourseListRow;
import com.tcm.training.admin.live.vo.CoursePurchaseOrderListRow;
import com.tcm.training.admin.member.entity.AppUser;
import com.tcm.training.admin.member.mapper.UserMapper;
import com.tcm.training.admin.system.service.SystemSettingsAppService;
import com.tcm.training.admin.system.vo.SystemSettingsVO;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.time.format.DateTimeFormatter;

/**
 * APP 养生课程详情聚合服务。
@@ -25,20 +75,87 @@

    private static final int COURSE_STATUS_ENABLED = 1;
    private static final int VIDEO_STATUS_ENABLED = 1;
    private static final String ACTION_TYPE_FAVORITE = "FAVORITE";
    private static final String ACTION_TYPE_CANCEL = "CANCEL";
    private static final String COURSE_TYPE_HEALTH = "HEALTH_COURSE";
    private static final String PURCHASE_TARGET_COURSE = "COURSE";
    private static final String PURCHASE_TARGET_CHAPTER = "COURSE_CHAPTER";
    private static final String PAYMENT_METHOD_WECHAT = "WECHAT";
    private static final String PAYMENT_METHOD_ALIPAY = "ALIPAY";
    private static final String ORDER_STATUS_PAID = "PAID";
    private static final DateTimeFormatter ORDER_NO_TIME_FORMATTER = DateTimeFormatter.ofPattern("yyyyMMddHHmmss");

    private final HealthCourseAppService healthCourseAppService;
    private final HealthCourseMapper healthCourseMapper;
    private final HealthCourseVideoMapper healthCourseVideoMapper;
    private final LiveCourseCategoryMapper liveCourseCategoryMapper;
    private final ExpertMapper expertMapper;
    private final HealthCourseDownloadRecordMapper healthCourseDownloadRecordMapper;
    private final HealthCourseFavoriteRecordMapper healthCourseFavoriteRecordMapper;
    private final HealthCourseMemberJoinRecordMapper healthCourseMemberJoinRecordMapper;
    private final HealthCoursePlayRecordMapper healthCoursePlayRecordMapper;
    private final AppAuthSessionService appAuthSessionService;
    private final CoursePurchaseOrderMapper coursePurchaseOrderMapper;
    private final UserMapper userMapper;
    private final SystemSettingsAppService systemSettingsAppService;

    /**
     * 注入 APP 养生课程详情所需依赖。
     */
    public AppHealthCourseService(HealthCourseAppService healthCourseAppService,
                                  HealthCourseMapper healthCourseMapper,
                                  HealthCourseVideoMapper healthCourseVideoMapper,
                                  ExpertMapper expertMapper) {
                                  LiveCourseCategoryMapper liveCourseCategoryMapper,
                                  ExpertMapper expertMapper,
                                  HealthCourseDownloadRecordMapper healthCourseDownloadRecordMapper,
                                  HealthCourseFavoriteRecordMapper healthCourseFavoriteRecordMapper,
                                  HealthCourseMemberJoinRecordMapper healthCourseMemberJoinRecordMapper,
                                  HealthCoursePlayRecordMapper healthCoursePlayRecordMapper,
                                  AppAuthSessionService appAuthSessionService,
                                  CoursePurchaseOrderMapper coursePurchaseOrderMapper,
                                  UserMapper userMapper,
                                  SystemSettingsAppService systemSettingsAppService) {
        this.healthCourseAppService = healthCourseAppService;
        this.healthCourseMapper = healthCourseMapper;
        this.healthCourseVideoMapper = healthCourseVideoMapper;
        this.liveCourseCategoryMapper = liveCourseCategoryMapper;
        this.expertMapper = expertMapper;
        this.healthCourseDownloadRecordMapper = healthCourseDownloadRecordMapper;
        this.healthCourseFavoriteRecordMapper = healthCourseFavoriteRecordMapper;
        this.healthCourseMemberJoinRecordMapper = healthCourseMemberJoinRecordMapper;
        this.healthCoursePlayRecordMapper = healthCoursePlayRecordMapper;
        this.appAuthSessionService = appAuthSessionService;
        this.coursePurchaseOrderMapper = coursePurchaseOrderMapper;
        this.userMapper = userMapper;
        this.systemSettingsAppService = systemSettingsAppService;
    }

    /**
     * 获取 APP 养生课程列表页数据。
     */
    public List<AppHealthCourseListItemVO> list(Long levelCategoryId, Long difficultyCategoryId) {
        List<HealthCourseListRow> rows = healthCourseMapper.selectCourseList(
                null,
                levelCategoryId,
                difficultyCategoryId,
                COURSE_STATUS_ENABLED
        );
        if (rows == null || rows.isEmpty()) {
            return Collections.emptyList();
        }
        List<AppHealthCourseListItemVO> result = new ArrayList<AppHealthCourseListItemVO>(rows.size());
        for (HealthCourseListRow row : rows) {
            AppHealthCourseListItemVO itemVO = new AppHealthCourseListItemVO();
            itemVO.setId(row.getId());
            itemVO.setTitle(trimToEmpty(row.getTitle()));
            itemVO.setCoverImage(trimToEmpty(row.getCoverImg()));
            itemVO.setLevelName(trimToEmpty(row.getLevelName()));
            itemVO.setDifficultyName(trimToEmpty(row.getDifficultyName()));
            itemVO.setSalePrice(defaultPrice(row.getSalePrice()));
            itemVO.setLearnUserCount(defaultNumber(row.getLearnUserCount()));
            result.add(itemVO);
        }
        return result;
    }

    /**
@@ -66,12 +183,743 @@
        detailVO.setTotalDurationSeconds(resolveTotalDurationSeconds(courseDetail, enabledVideos));
        detailVO.setTotalDurationText(formatCourseDuration(detailVO.getTotalDurationSeconds()));
        detailVO.setExpert(resolveExpert(courseDetail.getExpert() == null ? null : courseDetail.getExpert().getId()));
        detailVO.setServicePhone(resolveServicePhone());

        List<AppHealthCourseVideoVO> videoVOList = toVideoVOList(enabledVideos);
        PurchaseStateSnapshot purchaseState = resolvePurchaseState(courseDetail.getId());
        List<AppHealthCourseVideoVO> videoVOList = toVideoVOList(enabledVideos, purchaseState);
        detailVO.setVideos(videoVOList);
        detailVO.setFreeVideoCount(countFreeVideos(videoVOList));
        detailVO.setPaidVideoCount(countPaidVideos(videoVOList));
        detailVO.setFavorited(Boolean.valueOf(resolveFavorited(courseDetail.getId())));
        detailVO.setIsMember(Boolean.valueOf(purchaseState.isMember()));
        detailVO.setMemberCourseJoined(Boolean.valueOf(purchaseState.isMemberCourseJoined()));
        detailVO.setCourseOwned(Boolean.valueOf(purchaseState.isCourseOwned()));
        detailVO.setCoursePurchased(Boolean.valueOf(purchaseState.isCoursePurchased()));
        return detailVO;
    }

    /**
     * 获取当前登录用户的收藏课程列表。
     */
    public List<AppHealthCourseFavoriteItemVO> favorites() {
        Long userId = appAuthSessionService.requireLoginUserId();
        List<AppHealthCourseFavoriteRow> rows = healthCourseFavoriteRecordMapper.selectAppFavoriteCourses(userId);
        if (rows == null || rows.isEmpty()) {
            return Collections.emptyList();
        }
        List<AppHealthCourseFavoriteItemVO> result = new ArrayList<AppHealthCourseFavoriteItemVO>(rows.size());
        for (AppHealthCourseFavoriteRow row : rows) {
            AppHealthCourseFavoriteItemVO itemVO = new AppHealthCourseFavoriteItemVO();
            itemVO.setCourseId(row.getCourseId());
            itemVO.setTitle(trimToEmpty(row.getTitle()));
            itemVO.setCoverImage(trimToEmpty(row.getCoverImage()));
            itemVO.setLevelName(trimToEmpty(row.getLevelName()));
            itemVO.setDifficultyName(trimToEmpty(row.getDifficultyName()));
            itemVO.setTeacherName(trimToEmpty(row.getTeacherName()));
            itemVO.setTeacherAvatar(trimToEmpty(row.getTeacherAvatar()));
            itemVO.setLearnUserCount(defaultNumber(row.getLearnUserCount()));
            itemVO.setFavoritedAt(row.getFavoritedAt());
            result.add(itemVO);
        }
        return result;
    }

    /**
     * 获取当前登录用户的已完成下载列表。
     */
    public List<AppHealthCourseDownloadItemVO> downloads() {
        Long userId = appAuthSessionService.requireLoginUserId();
        List<AppHealthCourseDownloadRow> rows = healthCourseDownloadRecordMapper.selectAppDownloads(userId);
        if (rows == null || rows.isEmpty()) {
            return Collections.emptyList();
        }
        List<AppHealthCourseDownloadItemVO> result = new ArrayList<AppHealthCourseDownloadItemVO>(rows.size());
        for (AppHealthCourseDownloadRow row : rows) {
            AppHealthCourseDownloadItemVO itemVO = new AppHealthCourseDownloadItemVO();
            itemVO.setId(row.getId());
            itemVO.setCourseId(row.getCourseId());
            itemVO.setCourseVideoId(row.getCourseVideoId());
            itemVO.setTitle(trimToEmpty(row.getTitle()));
            itemVO.setSubtitle(trimToEmpty(row.getSubtitle()));
            itemVO.setCoverImage(trimToEmpty(row.getCoverImage()));
            itemVO.setDurationSeconds(defaultNumber(row.getDurationSeconds()));
            itemVO.setDurationText(formatVideoDuration(itemVO.getDurationSeconds()));
            itemVO.setVideoUrl(trimToEmpty(row.getVideoUrl()));
            itemVO.setDownloadedAt(row.getDownloadedAt());
            result.add(itemVO);
        }
        return result;
    }

    /**
     * 获取当前登录用户的我的课程列表。
     */
    public List<AppMyHealthCourseItemVO> myCourses() {
        Long userId = appAuthSessionService.requireLoginUserId();
        List<HealthCourseOwnershipSnapshot> snapshots = listMyCourseSnapshots(userId);
        if (snapshots.isEmpty()) {
            return Collections.emptyList();
        }
        Map<Long, CourseProgressSnapshot> progressSnapshotMap = buildCourseProgressSnapshotMap(userId, extractCourseIds(snapshots));
        List<AppMyHealthCourseItemVO> result = new ArrayList<AppMyHealthCourseItemVO>(snapshots.size());
        for (HealthCourseOwnershipSnapshot snapshot : snapshots) {
            AppMyHealthCourseItemVO itemVO = new AppMyHealthCourseItemVO();
            itemVO.setCourseId(snapshot.getCourseId());
            itemVO.setTitle(trimToEmpty(snapshot.getTitle()));
            itemVO.setCoverImage(trimToEmpty(snapshot.getCoverImage()));
            itemVO.setHasHealthTag(Boolean.TRUE);
            CourseProgressSnapshot progressSnapshot = progressSnapshotMap.get(snapshot.getCourseId());
            int completedLessons = progressSnapshot == null ? 0 : progressSnapshot.getCompletedLessons();
            int totalLessons = snapshot.getTotalLessons();
            itemVO.setCompletedLessons(Integer.valueOf(completedLessons));
            itemVO.setTotalLessons(Integer.valueOf(totalLessons));
            itemVO.setProgressPercent(Integer.valueOf(calculateProgressPercent(completedLessons, totalLessons)));
            itemVO.setSourceType(snapshot.getSourceType());
            itemVO.setRemovable(Boolean.valueOf(snapshot.isRemovable()));
            result.add(itemVO);
        }
        return result;
    }

    /**
     * 删除当前登录用户的会员加课课程。
     */
    @Transactional
    public void removeMyCourse(Long courseId) {
        Long userId = appAuthSessionService.requireLoginUserId();
        requireEnabledCourse(courseId);
        if (findLatestActivePaidCourseOrder(userId, courseId) != null) {
            throw new IllegalArgumentException("已购买课程不支持移除");
        }
        HealthCourseMemberJoinRecord joinRecord = findMemberJoinRecord(courseId, userId);
        if (joinRecord == null) {
            throw new IllegalArgumentException("课程不存在或已移除");
        }
        healthCourseMemberJoinRecordMapper.update(null, new LambdaUpdateWrapper<HealthCourseMemberJoinRecord>()
                .eq(HealthCourseMemberJoinRecord::getId, joinRecord.getId())
                .eq(HealthCourseMemberJoinRecord::getAppUserId, userId)
                .eq(HealthCourseMemberJoinRecord::getDeleted, 0)
                .set(HealthCourseMemberJoinRecord::getDeleted, 1));
    }

    /**
     * 获取当前登录用户的我的课程详情。
     */
    public AppMyHealthCourseDetailVO myCourseDetail(Long courseId) {
        Long userId = appAuthSessionService.requireLoginUserId();
        HealthCourseOwnershipSnapshot ownershipSnapshot = requireOwnedCourse(userId, courseId);
        HealthCourse course = requireEnabledCourse(courseId);
        List<HealthCourseVideo> enabledVideos = listEnabledVideos(courseId);
        Map<Long, VideoProgressSnapshot> videoProgressSnapshotMap = buildVideoProgressSnapshotMap(userId, Collections.singletonList(courseId));
        PurchaseStateSnapshot purchaseStateSnapshot = resolvePurchaseState(courseId);

        List<AppMyHealthCourseVideoItemVO> videos = new ArrayList<AppMyHealthCourseVideoItemVO>(enabledVideos.size());
        Long currentVideoId = null;
        LocalDateTime latestLearnAt = null;
        for (HealthCourseVideo video : enabledVideos) {
            VideoProgressSnapshot snapshot = videoProgressSnapshotMap.get(video.getId());
            boolean freeAccess = isFreeVideo(video.getSalePrice());
            boolean purchased = purchaseStateSnapshot.isCourseOwned()
                    || purchaseStateSnapshot.getPurchasedVideoIds().contains(video.getId());
            boolean locked = !freeAccess && !purchased;
            AppMyHealthCourseVideoItemVO itemVO = new AppMyHealthCourseVideoItemVO();
            itemVO.setVideoId(video.getId());
            itemVO.setChapterName(trimToEmpty(video.getChapterName()));
            itemVO.setDurationSeconds(defaultNumber(video.getDurationSeconds()));
            itemVO.setDurationText(formatVideoDuration(itemVO.getDurationSeconds()));
            itemVO.setFreeAccess(Boolean.valueOf(freeAccess));
            itemVO.setPurchased(Boolean.valueOf(purchased));
            itemVO.setLocked(Boolean.valueOf(locked));
            itemVO.setVideoUrl(trimToEmpty(video.getVideoUrl()));
            itemVO.setCompleted(Boolean.valueOf(snapshot != null && snapshot.isCompleted()));
            itemVO.setProgressPercent(Integer.valueOf(calculateVideoDisplayProgressPercent(
                    snapshot == null ? 0 : snapshot.getCumulativeWatchSeconds(),
                    itemVO.getDurationSeconds().intValue(),
                    snapshot != null && snapshot.isCompleted()
            )));
            itemVO.setLastPlayPositionSeconds(Integer.valueOf(resolveVideoResumePosition(snapshot)));
            itemVO.setDownloadable(Boolean.valueOf(hasVideoDownloadAccess(userId, courseId, video.getId())));
            videos.add(itemVO);
            // 默认播放章节只允许落在当前用户可观看的小节上，未购小节保留展示但不自动选中。
            if (!locked && snapshot != null && snapshot.getLatestLearnAt() != null
                    && (latestLearnAt == null || snapshot.getLatestLearnAt().isAfter(latestLearnAt))) {
                latestLearnAt = snapshot.getLatestLearnAt();
                currentVideoId = video.getId();
            }
        }
        if (currentVideoId == null) {
            for (AppMyHealthCourseVideoItemVO itemVO : videos) {
                if (!Boolean.TRUE.equals(itemVO.getLocked())) {
                    currentVideoId = itemVO.getVideoId();
                    break;
                }
            }
        }

        AppMyHealthCourseDetailVO detailVO = new AppMyHealthCourseDetailVO();
        detailVO.setCourseId(course.getId());
        detailVO.setTitle(trimToEmpty(course.getTitle()));
        detailVO.setCourseTitle(trimToEmpty(course.getTitle()));
        detailVO.setCoverImage(trimToEmpty(course.getCoverImg()));
        detailVO.setTotalLessons(Integer.valueOf(enabledVideos.size()));
        detailVO.setTotalDurationText(formatCourseDuration(resolveTotalDurationSecondsByEntity(course, enabledVideos)));
        detailVO.setCurrentVideoId(currentVideoId);
        detailVO.setServicePhone(resolveServicePhone());
        detailVO.setIntroAvailable(Boolean.TRUE);
        detailVO.setVideos(videos);
        return detailVO;
    }

    /**
     * 上报当前登录用户的我的课程播放记录。
     */
    @Transactional
    public AppHealthCoursePlayRecordUploadResultVO uploadMyCoursePlayRecord(Long courseId,
                                                                            Long videoId,
                                                                            AppHealthCoursePlayRecordUploadRequest request) {
        Long userId = appAuthSessionService.requireLoginUserId();
        requireOwnedCourse(userId, courseId);
        HealthCourseVideo video = requireEnabledVideo(courseId, videoId);
        validatePlayRecordRequest(request);

        int videoDurationSeconds = defaultNumber(video.getDurationSeconds());
        int cumulativeWatchSeconds = resolveExistingCumulativeWatchSeconds(userId, courseId, videoId)
                + defaultNumber(request.getDurationSeconds());
        boolean completed = videoDurationSeconds > 0 && cumulativeWatchSeconds >= videoDurationSeconds;
        int lastPlayPositionSeconds = completed ? 0 : normalizePlayPosition(request.getLastPlayPositionSeconds(), videoDurationSeconds);

        HealthCoursePlayRecord playRecord = new HealthCoursePlayRecord();
        playRecord.setCourseId(courseId);
        playRecord.setVideoId(videoId);
        playRecord.setAppUserId(userId);
        playRecord.setPlayStart(request.getPlayStart());
        playRecord.setPlayEnd(request.getPlayEnd());
        playRecord.setDurationSeconds(defaultNumber(request.getDurationSeconds()));
        playRecord.setIsCompleted(completed ? 1 : 0);
        playRecord.setLastPlayPositionSeconds(lastPlayPositionSeconds);
        healthCoursePlayRecordMapper.insert(playRecord);

        Map<Long, VideoProgressSnapshot> videoProgressSnapshotMap = buildVideoProgressSnapshotMap(userId, Collections.singletonList(courseId));
        VideoProgressSnapshot videoProgressSnapshot = videoProgressSnapshotMap.get(videoId);
        CourseProgressSnapshot courseProgressSnapshot = buildCourseProgressSnapshotMap(userId, Collections.singletonList(courseId)).get(courseId);

        AppHealthCoursePlayRecordUploadResultVO resultVO = new AppHealthCoursePlayRecordUploadResultVO();
        resultVO.setLastPlayPositionSeconds(Integer.valueOf(resolveVideoResumePosition(videoProgressSnapshot)));
        resultVO.setCompleted(Boolean.valueOf(videoProgressSnapshot != null && videoProgressSnapshot.isCompleted()));
        resultVO.setProgressPercent(Integer.valueOf(calculateVideoDisplayProgressPercent(
                videoProgressSnapshot == null ? 0 : videoProgressSnapshot.getCumulativeWatchSeconds(),
                videoDurationSeconds,
                videoProgressSnapshot != null && videoProgressSnapshot.isCompleted()
        )));
        int totalLessons = listEnabledVideos(courseId).size();
        int completedLessons = courseProgressSnapshot == null ? 0 : courseProgressSnapshot.getCompletedLessons();
        resultVO.setCompletedLessons(Integer.valueOf(completedLessons));
        resultVO.setTotalLessons(Integer.valueOf(totalLessons));
        resultVO.setCourseProgressPercent(Integer.valueOf(calculateProgressPercent(completedLessons, totalLessons)));
        return resultVO;
    }

    /**
     * 记录当前登录用户的课程小节下载完成状态。
     */
    @Transactional
    public void reportDownload(AppHealthCourseDownloadReportRequest request) {
        Long userId = appAuthSessionService.requireLoginUserId();
        Long courseId = request == null ? null : request.getCourseId();
        Long courseVideoId = request == null ? null : request.getCourseVideoId();
        HealthCourse course = requireEnabledCourse(courseId);
        HealthCourseVideo video = requireEnabledVideo(courseId, courseVideoId);
        if (trimToEmpty(video.getVideoUrl()).isEmpty()) {
            throw new IllegalArgumentException("当前课程小节暂未配置视频地址");
        }
        if (!hasVideoDownloadAccess(userId, courseId, courseVideoId)) {
            throw new IllegalArgumentException("当前课程小节未购买，无法下载");
        }
        HealthCourseDownloadRecord existingRecord = findActiveDownloadRecord(userId, courseVideoId);
        if (existingRecord == null) {
            HealthCourseDownloadRecord record = buildDownloadRecord(userId, course, video);
            healthCourseDownloadRecordMapper.insert(record);
            return;
        }
        // 重复下载同一小节时只刷新快照与更新时间，避免列表产生重复项。
        HealthCourseDownloadRecord refreshRecord = buildDownloadRecord(userId, course, video);
        refreshRecord.setId(existingRecord.getId());
        healthCourseDownloadRecordMapper.updateById(refreshRecord);
    }

    /**
     * 批量删除当前登录用户的下载记录。
     */
    @Transactional
    public void batchDeleteDownloads(AppHealthCourseDownloadBatchDeleteRequest request) {
        Long userId = appAuthSessionService.requireLoginUserId();
        Set<Long> recordIds = normalizeDownloadIds(request);
        if (recordIds.isEmpty()) {
            throw new IllegalArgumentException("请选择要删除的下载记录");
        }
        for (Long recordId : recordIds) {
            healthCourseDownloadRecordMapper.update(null, new LambdaUpdateWrapper<HealthCourseDownloadRecord>()
                    .eq(HealthCourseDownloadRecord::getId, recordId)
                    .eq(HealthCourseDownloadRecord::getAppUserId, userId)
                    .eq(HealthCourseDownloadRecord::getDeleted, 0)
                    .set(HealthCourseDownloadRecord::getDeleted, 1));
        }
    }

    /**
     * 批量取消当前登录用户的养生课程收藏。
     */
    @Transactional
    public void batchCancelFavorite(AppHealthCourseFavoriteBatchCancelRequest request) {
        Long userId = appAuthSessionService.requireLoginUserId();
        Set<Long> courseIds = normalizeCourseIds(request);
        if (courseIds.isEmpty()) {
            throw new IllegalArgumentException("请选择要取消收藏的课程");
        }
        for (Long courseId : courseIds) {
            cancelFavoriteIfNeeded(courseId, userId);
        }
    }

    /**
     * 收藏 APP 养生课程。
     */
    @Transactional
    public AppHealthCourseFavoriteResultVO favorite(Long courseId) {
        Long userId = appAuthSessionService.requireLoginUserId();
        HealthCourse course = requireEnabledCourse(courseId);
        HealthCourseFavoriteRecord latestRecord = findLatestFavoriteRecord(courseId, userId);
        if (isFavorited(latestRecord)) {
            return buildFavoriteResult(course.getId(), true, course.getFavoriteCount());
        }
        insertFavoriteRecord(courseId, userId, ACTION_TYPE_FAVORITE);
        updateFavoriteCount(courseId, true);
        return buildFavoriteResult(courseId, true, defaultNumber(course.getFavoriteCount()) + 1);
    }

    /**
     * 取消收藏 APP 养生课程。
     */
    @Transactional
    public AppHealthCourseFavoriteResultVO cancelFavorite(Long courseId) {
        Long userId = appAuthSessionService.requireLoginUserId();
        HealthCourse course = requireEnabledCourse(courseId);
        HealthCourseFavoriteRecord latestRecord = findLatestFavoriteRecord(courseId, userId);
        if (!isFavorited(latestRecord)) {
            return buildFavoriteResult(course.getId(), false, course.getFavoriteCount());
        }
        insertFavoriteRecord(courseId, userId, ACTION_TYPE_CANCEL);
        updateFavoriteCount(courseId, false);
        return buildFavoriteResult(courseId, false, Math.max(defaultNumber(course.getFavoriteCount()) - 1, 0));
    }

    /**
     * 购买 APP 养生课程整课。
     */
    @Transactional
    public AppHealthCoursePurchaseResultVO purchaseCourse(Long courseId, AppHealthCoursePurchaseRequest request) {
        Long userId = appAuthSessionService.requireLoginUserId();
        AppUser user = requireEnabledUser(userId);
        HealthCourse course = requireEnabledCourse(courseId);
        String paymentMethod = normalizePaymentMethod(request == null ? null : request.getPaymentMethod());
        CoursePurchaseOrder existingOrder = findLatestActivePaidCourseOrder(userId, courseId);
        if (existingOrder != null) {
            return buildPurchaseResult(existingOrder, true, resolvePurchasedVideoIds(userId, courseId, true));
        }

        CoursePurchaseOrder order = buildCourseOrder(user, course, paymentMethod, LocalDateTime.now());
        coursePurchaseOrderMapper.insert(order);
        return buildPurchaseResult(order, true, resolvePurchasedVideoIds(userId, courseId, true));
    }

    /**
     * 购买 APP 养生课程小节。
     */
    @Transactional
    public AppHealthCoursePurchaseResultVO purchaseVideo(Long courseId, Long videoId, AppHealthCoursePurchaseRequest request) {
        Long userId = appAuthSessionService.requireLoginUserId();
        AppUser user = requireEnabledUser(userId);
        HealthCourse course = requireEnabledCourse(courseId);
        HealthCourseVideo video = requireEnabledVideo(courseId, videoId);
        String paymentMethod = normalizePaymentMethod(request == null ? null : request.getPaymentMethod());
        if (isFreeVideo(video.getSalePrice())) {
            throw new IllegalArgumentException("免费小节无需购买");
        }

        CoursePurchaseOrder existingCourseOrder = findLatestActivePaidCourseOrder(userId, courseId);
        if (existingCourseOrder != null) {
            return buildPurchaseResult(existingCourseOrder, true, resolvePurchasedVideoIds(userId, courseId, true));
        }

        CoursePurchaseOrder existingVideoOrder = findLatestActivePaidVideoOrder(userId, courseId, videoId);
        if (existingVideoOrder != null) {
            return buildPurchaseResult(existingVideoOrder, false, resolvePurchasedVideoIds(userId, courseId, false));
        }

        CoursePurchaseOrder order = buildVideoOrder(user, course, video, paymentMethod, LocalDateTime.now());
        coursePurchaseOrderMapper.insert(order);
        return buildPurchaseResult(order, false, resolvePurchasedVideoIds(userId, courseId, false));
    }

    /**
     * 会员将养生课程加入我的课程。
     */
    @Transactional
    public boolean memberJoinCourse(Long courseId) {
        Long userId = appAuthSessionService.requireLoginUserId();
        AppUser user = requireEnabledUser(userId);
        requireEnabledCourse(courseId);
        if (!isActiveMember(user)) {
            throw new IllegalArgumentException("当前用户不是有效会员");
        }
        if (findLatestActivePaidCourseOrder(userId, courseId) != null) {
            return true;
        }
        if (findMemberJoinRecord(courseId, userId) != null) {
            return true;
        }
        HealthCourseMemberJoinRecord record = new HealthCourseMemberJoinRecord();
        record.setCourseId(courseId);
        record.setAppUserId(userId);
        record.setJoinedAt(LocalDateTime.now());
        record.setDeleted(0);
        healthCourseMemberJoinRecordMapper.insert(record);
        return true;
    }

    /**
     * 获取 APP 养生课程主题筛选项。
     */
    public List<AppHealthCourseCategoryOptionVO> listThemes() {
        return listCategoriesByType(LiveCourseCategoryAppService.TYPE_LEVEL);
    }

    /**
     * 获取 APP 养生课程难度筛选项。
     */
    public List<AppHealthCourseCategoryOptionVO> listDifficulties() {
        return listCategoriesByType(LiveCourseCategoryAppService.TYPE_DIFFICULTY);
    }

    /**
     * 按分类类型读取 APP 养生课程筛选项。
     */
    private List<AppHealthCourseCategoryOptionVO> listCategoriesByType(String categoryType) {
        List<LiveCourseCategory> categories = liveCourseCategoryMapper.selectList(new LambdaQueryWrapper<LiveCourseCategory>()
                .eq(LiveCourseCategory::getType, categoryType)
                .eq(LiveCourseCategory::getDeleted, 0)
                .orderByAsc(LiveCourseCategory::getSort)
                .orderByAsc(LiveCourseCategory::getId));
        if (categories == null || categories.isEmpty()) {
            return Collections.emptyList();
        }
        List<AppHealthCourseCategoryOptionVO> result =
                new ArrayList<AppHealthCourseCategoryOptionVO>(categories.size());
        for (LiveCourseCategory category : categories) {
            AppHealthCourseCategoryOptionVO optionVO = new AppHealthCourseCategoryOptionVO();
            optionVO.setId(category.getId());
            optionVO.setName(trimToEmpty(category.getName()));
            result.add(optionVO);
        }
        return result;
    }

    /**
     * 汇总我的课程来源，已购课程优先级高于会员加课。
     */
    private List<HealthCourseOwnershipSnapshot> listMyCourseSnapshots(Long userId) {
        Map<Long, HealthCourseOwnershipSnapshot> snapshotMap = new HashMap<Long, HealthCourseOwnershipSnapshot>();
        List<CoursePurchaseOrderListRow> paidCourseRows = coursePurchaseOrderMapper.selectPaidCourseSnapshots(userId);
        if (paidCourseRows != null) {
            for (CoursePurchaseOrderListRow row : paidCourseRows) {
                Long courseId = row.getCourseId();
                if (courseId == null || snapshotMap.containsKey(courseId)) {
                    continue;
                }
                HealthCourse course = healthCourseMapper.selectById(courseId);
                if (!isEnabledCourse(course)) {
                    continue;
                }
                snapshotMap.put(courseId, buildOwnershipSnapshot(course, "PURCHASED", false));
            }
        }
        List<Long> memberCourseIds = healthCourseMemberJoinRecordMapper.selectActiveCourseIdsByUserId(userId);
        if (memberCourseIds != null) {
            for (Long courseId : memberCourseIds) {
                if (courseId == null || snapshotMap.containsKey(courseId)) {
                    continue;
                }
                HealthCourse course = healthCourseMapper.selectById(courseId);
                if (!isEnabledCourse(course)) {
                    continue;
                }
                snapshotMap.put(courseId, buildOwnershipSnapshot(course, "MEMBER_JOIN", true));
            }
        }
        List<HealthCourseOwnershipSnapshot> snapshots = new ArrayList<HealthCourseOwnershipSnapshot>(snapshotMap.values());
        Collections.sort(snapshots, Comparator.comparing(HealthCourseOwnershipSnapshot::getCourseId).reversed());
        return snapshots;
    }

    /**
     * 校验课程是否属于当前登录用户的我的课程。
     */
    private HealthCourseOwnershipSnapshot requireOwnedCourse(Long userId, Long courseId) {
        List<HealthCourseOwnershipSnapshot> snapshots = listMyCourseSnapshots(userId);
        for (HealthCourseOwnershipSnapshot snapshot : snapshots) {
            if (snapshot.getCourseId().equals(courseId)) {
                return snapshot;
            }
        }
        throw new IllegalArgumentException("课程不存在或未加入我的课程");
    }

    /**
     * 构建课程归属快照，供我的课程相关接口复用。
     */
    private HealthCourseOwnershipSnapshot buildOwnershipSnapshot(HealthCourse course, String sourceType, boolean removable) {
        return new HealthCourseOwnershipSnapshot(
                course.getId(),
                trimToEmpty(course.getTitle()),
                trimToEmpty(course.getCoverImg()),
                countEnabledVideos(course.getId()),
                sourceType,
                removable
        );
    }

    /**
     * 批量构建课程整体进度快照。
     */
    private Map<Long, CourseProgressSnapshot> buildCourseProgressSnapshotMap(Long userId, List<Long> courseIds) {
        if (courseIds == null || courseIds.isEmpty()) {
            return Collections.emptyMap();
        }
        List<AppMyHealthCourseProgressRow> rows = healthCoursePlayRecordMapper.selectCourseProgressByCourseIds(userId, courseIds);
        Map<Long, CourseProgressSnapshot> snapshotMap = new HashMap<Long, CourseProgressSnapshot>();
        if (rows == null) {
            return snapshotMap;
        }
        for (AppMyHealthCourseProgressRow row : rows) {
            if (row.getCourseId() == null) {
                continue;
            }
            snapshotMap.put(row.getCourseId(), new CourseProgressSnapshot(
                    defaultNumber(row.getCompletedLessons()),
                    row.getLatestLearnAt()
            ));
        }
        return snapshotMap;
    }

    /**
     * 批量构建章节进度快照，并以章节ID作为索引键。
     */
    private Map<Long, VideoProgressSnapshot> buildVideoProgressSnapshotMap(Long userId, List<Long> courseIds) {
        if (courseIds == null || courseIds.isEmpty()) {
            return Collections.emptyMap();
        }
        List<AppMyHealthCourseVideoProgressRow> rows = healthCoursePlayRecordMapper.selectVideoProgressByCourseIds(userId, courseIds);
        Map<Long, VideoProgressSnapshot> snapshotMap = new HashMap<Long, VideoProgressSnapshot>();
        if (rows == null) {
            return snapshotMap;
        }
        for (AppMyHealthCourseVideoProgressRow row : rows) {
            if (row.getVideoId() == null) {
                continue;
            }
            snapshotMap.put(row.getVideoId(), new VideoProgressSnapshot(
                    defaultNumber(row.getCumulativeWatchSeconds()),
                    row.getCompleted() != null && row.getCompleted().intValue() == 1,
                    defaultNumber(row.getLastPlayPositionSeconds()),
                    row.getLatestLearnAt()
            ));
        }
        return snapshotMap;
    }

    /**
     * 提取课程主键集合，便于批量查询进度。
     */
    private List<Long> extractCourseIds(List<HealthCourseOwnershipSnapshot> snapshots) {
        List<Long> courseIds = new ArrayList<Long>(snapshots.size());
        for (HealthCourseOwnershipSnapshot snapshot : snapshots) {
            courseIds.add(snapshot.getCourseId());
        }
        return courseIds;
    }

    /**
     * 统计课程启用章节数量。
     */
    private int countEnabledVideos(Long courseId) {
        return listEnabledVideos(courseId).size();
    }

    /**
     * 计算百分比进度。
     */
    private int calculateProgressPercent(int current, int total) {
        if (total <= 0 || current <= 0) {
            return 0;
        }
        if (current >= total) {
            return 100;
        }
        return Math.max(Math.min((int) Math.round((current * 100.0D) / total), 100), 0);
    }

    /**
     * 计算章节播放进度展示值，未完播章节最高仅展示到99%，避免与完播态混淆。
     */
    private int calculateVideoDisplayProgressPercent(int current, int total, boolean completed) {
        int progressPercent = calculateProgressPercent(current, total);
        if (!completed && progressPercent >= 100) {
            return 99;
        }
        return progressPercent;
    }

    /**
     * 解析章节续播位置，已完播章节再次进入时从头播放。
     */
    private int resolveVideoResumePosition(VideoProgressSnapshot snapshot) {
        if (snapshot == null || snapshot.isCompleted()) {
            return 0;
        }
        return Math.max(snapshot.getLastPlayPositionSeconds(), 0);
    }

    /**
     * 校验播放记录上报请求。
     */
    private void validatePlayRecordRequest(AppHealthCoursePlayRecordUploadRequest request) {
        if (request == null) {
            throw new IllegalArgumentException("播放记录不能为空");
        }
        if (request.getPlayStart() == null || request.getPlayEnd() == null) {
            throw new IllegalArgumentException("播放时间不能为空");
        }
        if (request.getPlayEnd().isBefore(request.getPlayStart())) {
            throw new IllegalArgumentException("播放结束时间不能早于开始时间");
        }
    }

    /**
     * 查询当前章节已累计观看时长。
     */
    private int resolveExistingCumulativeWatchSeconds(Long userId, Long courseId, Long videoId) {
        List<HealthCoursePlayRecord> records = healthCoursePlayRecordMapper.selectList(new LambdaQueryWrapper<HealthCoursePlayRecord>()
                .eq(HealthCoursePlayRecord::getAppUserId, userId)
                .eq(HealthCoursePlayRecord::getCourseId, courseId)
                .eq(HealthCoursePlayRecord::getVideoId, videoId));
        if (records == null || records.isEmpty()) {
            return 0;
        }
        int sum = 0;
        for (HealthCoursePlayRecord record : records) {
            sum += defaultNumber(record.getDurationSeconds());
        }
        return sum;
    }

    /**
     * 归一化播放位置，避免超出视频时长。
     */
    private int normalizePlayPosition(Integer lastPlayPositionSeconds, int videoDurationSeconds) {
        int position = defaultNumber(lastPlayPositionSeconds);
        if (videoDurationSeconds <= 0) {
            return Math.max(position, 0);
        }
        return Math.max(Math.min(position, videoDurationSeconds), 0);
    }

    /**
     * 使用实体数据解析课程总时长。
     */
    private Integer resolveTotalDurationSecondsByEntity(HealthCourse course, List<HealthCourseVideo> videos) {
        Integer totalDurationSeconds = course.getTotalDurationSeconds();
        if (totalDurationSeconds != null && totalDurationSeconds.intValue() > 0) {
            return totalDurationSeconds;
        }
        int sum = 0;
        for (HealthCourseVideo video : videos) {
            sum += defaultNumber(video.getDurationSeconds());
        }
        return Integer.valueOf(sum);
    }

    /**
     * 判断课程是否为启用状态。
     */
    private boolean isEnabledCourse(HealthCourse course) {
        return course != null
                && course.getDeleted() != null
                && course.getDeleted().intValue() == 0
                && course.getStatus() != null
                && course.getStatus().intValue() == COURSE_STATUS_ENABLED;
    }

    /**
     * 判断当前请求用户是否已收藏课程；游客统一视为未收藏。
     */
    private boolean resolveFavorited(Long courseId) {
        if (!appAuthSessionService.isLogin()) {
            return false;
        }
        Long userId = appAuthSessionService.getLoginUserId();
        if (userId == null) {
            return false;
        }
        return isFavorited(findLatestFavoriteRecord(courseId, userId));
    }

    /**
     * 按课程集合规范化批量取消入参。
     */
    private Set<Long> normalizeCourseIds(AppHealthCourseFavoriteBatchCancelRequest request) {
        if (request == null || request.getCourseIds() == null || request.getCourseIds().isEmpty()) {
            return Collections.emptySet();
        }
        Set<Long> courseIds = new LinkedHashSet<Long>();
        for (Long courseId : request.getCourseIds()) {
            if (courseId != null) {
                courseIds.add(courseId);
            }
        }
        return courseIds;
    }

    /**
     * 按下载记录集合规范化批量删除入参。
     */
    private Set<Long> normalizeDownloadIds(AppHealthCourseDownloadBatchDeleteRequest request) {
        if (request == null || request.getIds() == null || request.getIds().isEmpty()) {
            return Collections.emptySet();
        }
        Set<Long> recordIds = new LinkedHashSet<Long>();
        for (Long id : request.getIds()) {
            if (id != null) {
                recordIds.add(id);
            }
        }
        return recordIds;
    }

    /**
     * 在当前课程仍为收藏态时写入取消流水并回收收藏数。
     */
    private void cancelFavoriteIfNeeded(Long courseId, Long userId) {
        HealthCourse course = healthCourseMapper.selectById(courseId);
        if (course == null || course.getDeleted() == null || course.getDeleted().intValue() != 0) {
            return;
        }
        HealthCourseFavoriteRecord latestRecord = findLatestFavoriteRecord(courseId, userId);
        if (!isFavorited(latestRecord)) {
            return;
        }
        insertFavoriteRecord(courseId, userId, ACTION_TYPE_CANCEL);
        updateFavoriteCount(courseId, false);
    }

    /**
@@ -136,7 +984,7 @@
    /**
     * 将启用视频列表转换为 APP 详情页可直接渲染的数据结构。
     */
    private List<AppHealthCourseVideoVO> toVideoVOList(List<HealthCourseVideo> videos) {
    private List<AppHealthCourseVideoVO> toVideoVOList(List<HealthCourseVideo> videos, PurchaseStateSnapshot purchaseState) {
        if (videos == null || videos.isEmpty()) {
            return Collections.emptyList();
        }
@@ -150,6 +998,15 @@
            videoVO.setSalePrice(defaultPrice(video.getSalePrice()));
            // 前端课程列表直接按该字段切分免费/付费列表，避免再次复制业务判断。
            videoVO.setFreeAccess(Boolean.valueOf(isFreeVideo(videoVO.getSalePrice())));
            boolean purchased = purchaseState.isCourseOwned()
                    || purchaseState.getPurchasedVideoIds().contains(video.getId());
            boolean locked = !Boolean.TRUE.equals(videoVO.getFreeAccess()) && !purchased;
            videoVO.setPurchased(Boolean.valueOf(purchased));
            videoVO.setLocked(Boolean.valueOf(locked));
            // 已购买章节需要直接拿到视频地址，前端才能切换为下载入口。
            videoVO.setVideoUrl(trimToEmpty(video.getVideoUrl()));
            videoVO.setCreatedAt(video.getCreatedAt());
            videoVO.setUpdatedAt(video.getUpdatedAt());
            result.add(videoVO);
        }
        return result;
@@ -201,6 +1058,378 @@
     */
    private boolean isFreeVideo(BigDecimal salePrice) {
        return salePrice == null || salePrice.compareTo(BigDecimal.ZERO) <= 0;
    }

    /**
     * 汇总当前登录用户的课程购买状态。
     */
    private PurchaseStateSnapshot resolvePurchaseState(Long courseId) {
        if (!appAuthSessionService.isLogin()) {
            return PurchaseStateSnapshot.empty();
        }
        Long userId = appAuthSessionService.getLoginUserId();
        if (userId == null) {
            return PurchaseStateSnapshot.empty();
        }
        AppUser user = userMapper.selectById(userId);
        if (user == null || user.getDeleted() == null || user.getDeleted().intValue() != 0) {
            return PurchaseStateSnapshot.empty();
        }
        CoursePurchaseOrder activeCourseOrder = findLatestActivePaidCourseOrder(userId, courseId);
        boolean coursePurchased = activeCourseOrder != null;
        boolean memberCourseJoined = findMemberJoinRecord(courseId, userId) != null;
        boolean courseOwned = coursePurchased || memberCourseJoined;
        return new PurchaseStateSnapshot(
                isActiveMember(user),
                memberCourseJoined,
                courseOwned,
                coursePurchased,
                resolvePurchasedVideoIds(userId, courseId, courseOwned)
        );
    }

    /**
     * 判断当前用户是否拥有指定小节的下载权限。
     */
    private boolean hasVideoDownloadAccess(Long userId, Long courseId, Long courseVideoId) {
        PurchaseStateSnapshot purchaseState = resolvePurchaseState(courseId);
        if (purchaseState.isCourseOwned()) {
            return true;
        }
        return purchaseState.getPurchasedVideoIds().contains(courseVideoId);
    }

    /**
     * 读取当前用户对课程仍有效的已购小节集合。
     */
    private List<Long> resolvePurchasedVideoIds(Long userId, Long courseId, boolean courseOwned) {
        if (courseOwned) {
            List<HealthCourseVideo> enabledVideos = listEnabledVideos(courseId);
            List<Long> allVideoIds = new ArrayList<Long>(enabledVideos.size());
            for (HealthCourseVideo video : enabledVideos) {
                allVideoIds.add(video.getId());
            }
            return allVideoIds;
        }
        List<CoursePurchaseOrder> orders = listActivePaidOrders(userId, courseId);
        Set<Long> purchasedVideoIds = new LinkedHashSet<Long>();
        for (CoursePurchaseOrder order : orders) {
            if (PURCHASE_TARGET_CHAPTER.equals(order.getPurchaseTargetType()) && order.getCourseVideoId() != null) {
                purchasedVideoIds.add(order.getCourseVideoId());
            }
        }
        return new ArrayList<Long>(purchasedVideoIds);
    }

    /**
     * 查询用户当前课程下所有有效的已支付订单。
     */
    private List<CoursePurchaseOrder> listActivePaidOrders(Long userId, Long courseId) {
        List<CoursePurchaseOrder> orders = coursePurchaseOrderMapper.selectList(new LambdaQueryWrapper<CoursePurchaseOrder>()
                .eq(CoursePurchaseOrder::getAppUserId, userId)
                .eq(CoursePurchaseOrder::getCourseType, COURSE_TYPE_HEALTH)
                .eq(CoursePurchaseOrder::getCourseId, courseId)
                .eq(CoursePurchaseOrder::getStatus, ORDER_STATUS_PAID)
                .eq(CoursePurchaseOrder::getDeleted, 0)
                .orderByDesc(CoursePurchaseOrder::getPaidAt)
                .orderByDesc(CoursePurchaseOrder::getId));
        return orders == null ? Collections.<CoursePurchaseOrder>emptyList() : orders;
    }

    /**
     * 查询用户当前课程最近一条有效整课订单。
     */
    private CoursePurchaseOrder findLatestActivePaidCourseOrder(Long userId, Long courseId) {
        return coursePurchaseOrderMapper.selectOne(new LambdaQueryWrapper<CoursePurchaseOrder>()
                .eq(CoursePurchaseOrder::getAppUserId, userId)
                .eq(CoursePurchaseOrder::getCourseType, COURSE_TYPE_HEALTH)
                .eq(CoursePurchaseOrder::getPurchaseTargetType, PURCHASE_TARGET_COURSE)
                .eq(CoursePurchaseOrder::getCourseId, courseId)
                .eq(CoursePurchaseOrder::getStatus, ORDER_STATUS_PAID)
                .eq(CoursePurchaseOrder::getDeleted, 0)
                .orderByDesc(CoursePurchaseOrder::getPaidAt)
                .orderByDesc(CoursePurchaseOrder::getId)
                .last("LIMIT 1"));
    }

    /**
     * 查询用户当前课程最近一条有效小节订单。
     */
    private CoursePurchaseOrder findLatestActivePaidVideoOrder(Long userId, Long courseId, Long videoId) {
        return coursePurchaseOrderMapper.selectOne(new LambdaQueryWrapper<CoursePurchaseOrder>()
                .eq(CoursePurchaseOrder::getAppUserId, userId)
                .eq(CoursePurchaseOrder::getCourseType, COURSE_TYPE_HEALTH)
                .eq(CoursePurchaseOrder::getPurchaseTargetType, PURCHASE_TARGET_CHAPTER)
                .eq(CoursePurchaseOrder::getCourseId, courseId)
                .eq(CoursePurchaseOrder::getCourseVideoId, videoId)
                .eq(CoursePurchaseOrder::getStatus, ORDER_STATUS_PAID)
                .eq(CoursePurchaseOrder::getDeleted, 0)
                .orderByDesc(CoursePurchaseOrder::getPaidAt)
                .orderByDesc(CoursePurchaseOrder::getId)
                .last("LIMIT 1"));
    }

    /**
     * 查询当前用户该小节最近一条未删除下载记录。
     */
    private HealthCourseDownloadRecord findActiveDownloadRecord(Long userId, Long courseVideoId) {
        return healthCourseDownloadRecordMapper.selectOne(new LambdaQueryWrapper<HealthCourseDownloadRecord>()
                .eq(HealthCourseDownloadRecord::getAppUserId, userId)
                .eq(HealthCourseDownloadRecord::getCourseVideoId, courseVideoId)
                .eq(HealthCourseDownloadRecord::getDeleted, 0)
                .orderByDesc(HealthCourseDownloadRecord::getUpdatedAt)
                .orderByDesc(HealthCourseDownloadRecord::getId)
                .last("LIMIT 1"));
    }

    /**
     * 组装课程小节下载记录快照。
     */
    private HealthCourseDownloadRecord buildDownloadRecord(Long userId, HealthCourse course, HealthCourseVideo video) {
        HealthCourseDownloadRecord record = new HealthCourseDownloadRecord();
        record.setAppUserId(userId);
        record.setCourseId(course.getId());
        record.setCourseVideoId(video.getId());
        record.setCourseTitleSnapshot(trimToEmpty(course.getTitle()));
        record.setChapterNameSnapshot(trimToEmpty(video.getChapterName()));
        record.setCoverImgSnapshot(trimToEmpty(course.getCoverImg()));
        record.setVideoUrlSnapshot(trimToEmpty(video.getVideoUrl()));
        record.setDurationSecondsSnapshot(defaultNumber(video.getDurationSeconds()));
        record.setDeleted(0);
        return record;
    }

    /**
     * 查询用户当前课程有效的会员加课记录。
     */
    private HealthCourseMemberJoinRecord findMemberJoinRecord(Long courseId, Long userId) {
        return healthCourseMemberJoinRecordMapper.selectOne(new LambdaQueryWrapper<HealthCourseMemberJoinRecord>()
                .eq(HealthCourseMemberJoinRecord::getCourseId, courseId)
                .eq(HealthCourseMemberJoinRecord::getAppUserId, userId)
                .eq(HealthCourseMemberJoinRecord::getDeleted, 0)
                .orderByDesc(HealthCourseMemberJoinRecord::getJoinedAt)
                .orderByDesc(HealthCourseMemberJoinRecord::getId)
                .last("LIMIT 1"));
    }

    /**
     * 组装整课订单数据，支付方案落地前直接记为已支付。
     */
    private CoursePurchaseOrder buildCourseOrder(AppUser user, HealthCourse course, String paymentMethod, LocalDateTime now) {
        CoursePurchaseOrder order = new CoursePurchaseOrder();
        order.setOrderNo(buildOrderNo(user.getId(), now));
        order.setAppUserId(user.getId());
        order.setUserNickname(resolveUserNickname(user));
        order.setUserPhone(trimToEmpty(user.getPhone()));
        order.setCourseType(COURSE_TYPE_HEALTH);
        order.setPurchaseTargetType(PURCHASE_TARGET_COURSE);
        order.setCourseId(course.getId());
        order.setCourseVideoId(null);
        order.setProductNameSnapshot(trimToEmpty(course.getTitle()));
        order.setCourseTitleSnapshot(trimToEmpty(course.getTitle()));
        order.setChapterNameSnapshot(null);
        order.setCoverImgSnapshot(trimToEmpty(course.getCoverImg()));
        order.setOrderAmount(defaultPrice(course.getSalePrice()));
        order.setPaymentMethod(paymentMethod);
        order.setRefundAmount(null);
        order.setRefundRemark(null);
        order.setStatus(ORDER_STATUS_PAID);
        order.setPaidAt(now);
        order.setRefundedAt(null);
        order.setCancelledAt(null);
        order.setDeleted(0);
        return order;
    }

    /**
     * 组装课程小节订单数据，支付方案落地前直接记为已支付。
     */
    private CoursePurchaseOrder buildVideoOrder(AppUser user,
                                                HealthCourse course,
                                                HealthCourseVideo video,
                                                String paymentMethod,
                                                LocalDateTime now) {
        CoursePurchaseOrder order = new CoursePurchaseOrder();
        order.setOrderNo(buildOrderNo(user.getId(), now));
        order.setAppUserId(user.getId());
        order.setUserNickname(resolveUserNickname(user));
        order.setUserPhone(trimToEmpty(user.getPhone()));
        order.setCourseType(COURSE_TYPE_HEALTH);
        order.setPurchaseTargetType(PURCHASE_TARGET_CHAPTER);
        order.setCourseId(course.getId());
        order.setCourseVideoId(video.getId());
        order.setProductNameSnapshot(trimToEmpty(course.getTitle()) + "-" + trimToEmpty(video.getChapterName()));
        order.setCourseTitleSnapshot(trimToEmpty(course.getTitle()));
        order.setChapterNameSnapshot(trimToEmpty(video.getChapterName()));
        order.setCoverImgSnapshot(trimToEmpty(course.getCoverImg()));
        order.setOrderAmount(defaultPrice(video.getSalePrice()));
        order.setPaymentMethod(paymentMethod);
        order.setRefundAmount(null);
        order.setRefundRemark(null);
        order.setStatus(ORDER_STATUS_PAID);
        order.setPaidAt(now);
        order.setRefundedAt(null);
        order.setCancelledAt(null);
        order.setDeleted(0);
        return order;
    }

    /**
     * 组装购买结果响应，供详情页直接回写购买态。
     */
    private AppHealthCoursePurchaseResultVO buildPurchaseResult(CoursePurchaseOrder order,
                                                                boolean coursePurchased,
                                                                List<Long> purchasedVideoIds) {
        AppHealthCoursePurchaseResultVO resultVO = new AppHealthCoursePurchaseResultVO();
        resultVO.setOrderId(order == null ? null : order.getId());
        resultVO.setOrderNo(order == null ? null : order.getOrderNo());
        resultVO.setPaymentMethod(order == null ? null : order.getPaymentMethod());
        resultVO.setStatus(order == null ? ORDER_STATUS_PAID : order.getStatus());
        resultVO.setPaidAt(order == null ? null : order.getPaidAt());
        resultVO.setCoursePurchased(Boolean.valueOf(coursePurchased));
        resultVO.setPurchasedVideoIds(purchasedVideoIds == null ? Collections.<Long>emptyList() : purchasedVideoIds);
        return resultVO;
    }

    /**
     * 校验当前登录用户存在且可用。
     */
    private AppUser requireEnabledUser(Long userId) {
        AppUser user = userMapper.selectById(userId);
        if (user == null || user.getDeleted() == null || user.getDeleted().intValue() != 0) {
            throw new IllegalArgumentException("用户不存在");
        }
        if (user.getStatus() == null || user.getStatus().intValue() != 1) {
            throw new IllegalArgumentException("用户已禁用");
        }
        return user;
    }

    /**
     * 校验课程小节存在、归属正确且已启用。
     */
    private HealthCourseVideo requireEnabledVideo(Long courseId, Long videoId) {
        HealthCourseVideo video = healthCourseVideoMapper.selectById(videoId);
        if (video == null || video.getDeleted() == null || video.getDeleted().intValue() != 0
                || video.getStatus() == null || video.getStatus().intValue() != VIDEO_STATUS_ENABLED) {
            throw new IllegalArgumentException("课程小节不存在");
        }
        if (!courseId.equals(video.getCourseId())) {
            throw new IllegalArgumentException("课程小节不存在");
        }
        return video;
    }

    /**
     * 规范化支付方式入参，仅允许微信或支付宝。
     */
    private String normalizePaymentMethod(String paymentMethod) {
        String normalized = trimToEmpty(paymentMethod).toUpperCase();
        if (PAYMENT_METHOD_WECHAT.equals(normalized) || PAYMENT_METHOD_ALIPAY.equals(normalized)) {
            return normalized;
        }
        throw new IllegalArgumentException("支付方式不合法");
    }

    /**
     * 生成课程订单号。
     */
    private String buildOrderNo(Long userId, LocalDateTime now) {
        String seed = String.valueOf(Math.abs((userId == null ? 0L : userId.longValue()) % 10000L));
        int nanoTail = Math.abs(now.getNano() / 1000) % 1000000;
        return "CPO" + ORDER_NO_TIME_FORMATTER.format(now)
                + String.format("%06d", nanoTail)
                + String.format("%04d", Integer.parseInt(seed));
    }

    /**
     * 优先使用昵称快照，没有昵称时降级到微信昵称或用户编号。
     */
    private String resolveUserNickname(AppUser user) {
        String nickname = trimToEmpty(user.getNickname());
        if (!nickname.isEmpty()) {
            return nickname;
        }
        String wechatNickname = trimToEmpty(user.getWechatNickname());
        if (!wechatNickname.isEmpty()) {
            return wechatNickname;
        }
        return "用户" + user.getId();
    }

    /**
     * 判断用户当前是否仍属于有效会员。
     */
    private boolean isActiveMember(AppUser user) {
        return user != null && user.getMemberExpireAt() != null && user.getMemberExpireAt().isAfter(LocalDateTime.now());
    }

    /**
     * 读取用户对课程的最新收藏操作记录。
     */
    private HealthCourseFavoriteRecord findLatestFavoriteRecord(Long courseId, Long userId) {
        return healthCourseFavoriteRecordMapper.selectOne(new LambdaQueryWrapper<HealthCourseFavoriteRecord>()
                .eq(HealthCourseFavoriteRecord::getCourseId, courseId)
                .eq(HealthCourseFavoriteRecord::getAppUserId, userId)
                .orderByDesc(HealthCourseFavoriteRecord::getActionTime)
                .orderByDesc(HealthCourseFavoriteRecord::getId)
                .last("LIMIT 1"));
    }

    /**
     * 判断最新操作是否表示当前仍处于已收藏状态。
     */
    private boolean isFavorited(HealthCourseFavoriteRecord latestRecord) {
        return latestRecord != null && ACTION_TYPE_FAVORITE.equalsIgnoreCase(trimToEmpty(latestRecord.getActionType()));
    }

    /**
     * 写入一条收藏流水记录。
     */
    private void insertFavoriteRecord(Long courseId, Long userId, String actionType) {
        HealthCourseFavoriteRecord record = new HealthCourseFavoriteRecord();
        record.setCourseId(courseId);
        record.setAppUserId(userId);
        record.setActionType(actionType);
        record.setActionTime(LocalDateTime.now());
        healthCourseFavoriteRecordMapper.insert(record);
    }

    /**
     * 更新课程收藏计数，仅在状态发生切换时调用。
     */
    private void updateFavoriteCount(Long courseId, boolean increase) {
        LambdaUpdateWrapper<HealthCourse> updateWrapper = new LambdaUpdateWrapper<HealthCourse>()
                .eq(HealthCourse::getId, courseId);
        if (increase) {
            updateWrapper.setSql("favorite_count = COALESCE(favorite_count, 0) + 1");
        } else {
            updateWrapper.setSql("favorite_count = GREATEST(COALESCE(favorite_count, 0) - 1, 0)");
        }
        healthCourseMapper.update(null, updateWrapper);
    }

    /**
     * 构造收藏操作返回结果，避免控制器层重复拼装。
     */
    private AppHealthCourseFavoriteResultVO buildFavoriteResult(Long courseId, boolean favorited, Integer favoriteCount) {
        AppHealthCourseFavoriteResultVO resultVO = new AppHealthCourseFavoriteResultVO();
        resultVO.setCourseId(courseId);
        resultVO.setFavorited(Boolean.valueOf(favorited));
        resultVO.setFavoriteCount(Integer.valueOf(Math.max(defaultNumber(favoriteCount), 0)));
        return resultVO;
    }

    /**
     * 校验课程存在且为启用状态。
     */
    private HealthCourse requireEnabledCourse(Long courseId) {
        HealthCourse course = healthCourseMapper.selectById(courseId);
        if (course == null || course.getDeleted() == null || course.getDeleted().intValue() != 0
                || course.getStatus() == null || course.getStatus().intValue() != COURSE_STATUS_ENABLED) {
            throw new IllegalArgumentException("养生课程不存在");
        }
        return course;
    }

    /**
@@ -260,4 +1489,173 @@
        String trimmed = value.trim();
        return trimmed.isEmpty() ? "" : trimmed;
    }

    /**
     * 读取当前系统配置的客服电话，未配置时返回空字符串。
     */
    private String resolveServicePhone() {
        SystemSettingsVO systemSettings = systemSettingsAppService.current();
        if (systemSettings == null) {
            return "";
        }
        return trimToEmpty(systemSettings.getServicePhone());
    }

    /**
     * APP 课程购买态快照。
     */
    private static final class PurchaseStateSnapshot {

        private final boolean member;
        private final boolean memberCourseJoined;
        private final boolean courseOwned;
        private final boolean coursePurchased;
        private final List<Long> purchasedVideoIds;

        private PurchaseStateSnapshot(boolean member,
                                      boolean memberCourseJoined,
                                      boolean courseOwned,
                                      boolean coursePurchased,
                                      List<Long> purchasedVideoIds) {
            this.member = member;
            this.memberCourseJoined = memberCourseJoined;
            this.courseOwned = courseOwned;
            this.coursePurchased = coursePurchased;
            this.purchasedVideoIds = purchasedVideoIds == null ? Collections.<Long>emptyList() : purchasedVideoIds;
        }

        private static PurchaseStateSnapshot empty() {
            return new PurchaseStateSnapshot(false, false, false, false, Collections.<Long>emptyList());
        }

        private boolean isMember() {
            return member;
        }

        private boolean isMemberCourseJoined() {
            return memberCourseJoined;
        }

        private boolean isCourseOwned() {
            return courseOwned;
        }

        private boolean isCoursePurchased() {
            return coursePurchased;
        }

        private List<Long> getPurchasedVideoIds() {
            return purchasedVideoIds;
        }
    }

    /**
     * 我的课程来源快照。
     */
    private static final class HealthCourseOwnershipSnapshot {

        private final Long courseId;
        private final String title;
        private final String coverImage;
        private final int totalLessons;
        private final String sourceType;
        private final boolean removable;

        private HealthCourseOwnershipSnapshot(Long courseId,
                                              String title,
                                              String coverImage,
                                              int totalLessons,
                                              String sourceType,
                                              boolean removable) {
            this.courseId = courseId;
            this.title = title;
            this.coverImage = coverImage;
            this.totalLessons = totalLessons;
            this.sourceType = sourceType;
            this.removable = removable;
        }

        private Long getCourseId() {
            return courseId;
        }

        private String getTitle() {
            return title;
        }

        private String getCoverImage() {
            return coverImage;
        }

        private int getTotalLessons() {
            return totalLessons;
        }

        private String getSourceType() {
            return sourceType;
        }

        private boolean isRemovable() {
            return removable;
        }
    }

    /**
     * 我的课程整体进度快照。
     */
    private static final class CourseProgressSnapshot {

        private final int completedLessons;
        private final LocalDateTime latestLearnAt;

        private CourseProgressSnapshot(int completedLessons, LocalDateTime latestLearnAt) {
            this.completedLessons = completedLessons;
            this.latestLearnAt = latestLearnAt;
        }

        private int getCompletedLessons() {
            return completedLessons;
        }

        private LocalDateTime getLatestLearnAt() {
            return latestLearnAt;
        }
    }

    /**
     * 我的课程章节进度快照。
     */
    private static final class VideoProgressSnapshot {

        private final int cumulativeWatchSeconds;
        private final boolean completed;
        private final int lastPlayPositionSeconds;
        private final LocalDateTime latestLearnAt;

        private VideoProgressSnapshot(int cumulativeWatchSeconds,
                                      boolean completed,
                                      int lastPlayPositionSeconds,
                                      LocalDateTime latestLearnAt) {
            this.cumulativeWatchSeconds = cumulativeWatchSeconds;
            this.completed = completed;
            this.lastPlayPositionSeconds = lastPlayPositionSeconds;
            this.latestLearnAt = latestLearnAt;
        }

        private int getCumulativeWatchSeconds() {
            return cumulativeWatchSeconds;
        }

        private boolean isCompleted() {
            return completed;
        }

        private int getLastPlayPositionSeconds() {
            return lastPlayPositionSeconds;
        }

        private LocalDateTime getLatestLearnAt() {
            return latestLearnAt;
        }
    }
}