package com.tcm.training.admin.app.home.service;
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import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
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import com.tcm.training.admin.app.home.vo.AppHomeFeaturedContentVO;
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import com.tcm.training.admin.app.home.vo.AppHomeFeaturedHealthCourseVO;
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import com.tcm.training.admin.app.home.vo.AppHomeFeaturedHealthPopularizationVO;
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import com.tcm.training.admin.live.entity.HealthCourse;
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import com.tcm.training.admin.live.entity.HealthPopularization;
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import com.tcm.training.admin.live.entity.LiveCourseCategory;
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import com.tcm.training.admin.live.mapper.HealthCourseMapper;
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import com.tcm.training.admin.live.mapper.HealthPopularizationMapper;
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import com.tcm.training.admin.live.mapper.LiveCourseCategoryMapper;
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import org.springframework.stereotype.Service;
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import java.math.BigDecimal;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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/**
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* APP 首页精选课程介绍模块聚合服务。
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*/
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@Service
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public class AppHomeFeaturedContentService {
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private static final int STATUS_ENABLED = 1;
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private static final int HOME_RECOMMEND_ENABLED = 1;
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private final HealthCourseMapper healthCourseMapper;
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private final HealthPopularizationMapper healthPopularizationMapper;
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private final LiveCourseCategoryMapper liveCourseCategoryMapper;
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/**
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* 注入首页精选模块所需的课程、科普与分类查询能力。
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*/
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public AppHomeFeaturedContentService(HealthCourseMapper healthCourseMapper,
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HealthPopularizationMapper healthPopularizationMapper,
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LiveCourseCategoryMapper liveCourseCategoryMapper) {
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this.healthCourseMapper = healthCourseMapper;
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this.healthPopularizationMapper = healthPopularizationMapper;
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this.liveCourseCategoryMapper = liveCourseCategoryMapper;
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}
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/**
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* 查询 APP 首页精选课程介绍模块数据。
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*/
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public AppHomeFeaturedContentVO getFeaturedContent() {
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AppHomeFeaturedContentVO vo = new AppHomeFeaturedContentVO();
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List<HealthCourse> healthCourses = loadHomeRecommendedHealthCourses();
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vo.setHealthCourses(toHealthCourseCards(healthCourses));
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vo.setHealthPopularizations(toPopularizationCards(loadHomeRecommendedPopularizations()));
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return vo;
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}
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/**
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* 查询首页推荐的养生课程。
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*/
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private List<HealthCourse> loadHomeRecommendedHealthCourses() {
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List<HealthCourse> records = healthCourseMapper.selectList(new LambdaQueryWrapper<HealthCourse>()
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.eq(HealthCourse::getDeleted, 0)
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.eq(HealthCourse::getStatus, STATUS_ENABLED)
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.eq(HealthCourse::getIsHomeRecommend, HOME_RECOMMEND_ENABLED)
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.orderByDesc(HealthCourse::getSort)
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.orderByDesc(HealthCourse::getId));
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return records == null ? Collections.<HealthCourse>emptyList() : records;
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}
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/**
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* 查询首页推荐的健康科普内容。
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*/
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private List<HealthPopularization> loadHomeRecommendedPopularizations() {
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List<HealthPopularization> records = healthPopularizationMapper.selectList(new LambdaQueryWrapper<HealthPopularization>()
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.eq(HealthPopularization::getDeleted, 0)
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.eq(HealthPopularization::getStatus, STATUS_ENABLED)
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.eq(HealthPopularization::getIsHomeRecommend, HOME_RECOMMEND_ENABLED)
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.orderByDesc(HealthPopularization::getSort)
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.orderByDesc(HealthPopularization::getId));
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return records == null ? Collections.<HealthPopularization>emptyList() : records;
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}
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/**
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* 将首页推荐养生课程转换为首页卡片响应。
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*/
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private List<AppHomeFeaturedHealthCourseVO> toHealthCourseCards(List<HealthCourse> courses) {
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if (courses == null || courses.isEmpty()) {
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return Collections.emptyList();
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}
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Map<Long, String> categoryNameMap = loadCategoryNameMap(courses);
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List<AppHomeFeaturedHealthCourseVO> result =
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new ArrayList<AppHomeFeaturedHealthCourseVO>(courses.size());
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for (HealthCourse course : courses) {
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AppHomeFeaturedHealthCourseVO vo = new AppHomeFeaturedHealthCourseVO();
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vo.setId(course.getId());
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vo.setTitle(trimToEmpty(course.getTitle()));
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vo.setCoverImage(trimToEmpty(course.getCoverImg()));
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vo.setLevelName(categoryNameMap.get(course.getLevelCategoryId()));
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vo.setDifficultyName(categoryNameMap.get(course.getDifficultyCategoryId()));
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vo.setSalePrice(course.getSalePrice() == null ? BigDecimal.ZERO : course.getSalePrice());
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vo.setLearnUserCount(defaultNumber(course.getLearnUserCount()));
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vo.setStudyingCount(defaultNumber(course.getStudyingCount()));
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result.add(vo);
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}
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return result;
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}
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/**
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* 批量加载首页课程卡片需要展示的分类名称。
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*/
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private Map<Long, String> loadCategoryNameMap(List<HealthCourse> courses) {
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List<Long> categoryIds = new ArrayList<Long>(courses.size() * 2);
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for (HealthCourse course : courses) {
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addCategoryId(categoryIds, course.getLevelCategoryId());
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addCategoryId(categoryIds, course.getDifficultyCategoryId());
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}
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if (categoryIds.isEmpty()) {
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return Collections.emptyMap();
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}
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List<LiveCourseCategory> categories = liveCourseCategoryMapper.selectList(new LambdaQueryWrapper<LiveCourseCategory>()
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.in(LiveCourseCategory::getId, categoryIds)
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.eq(LiveCourseCategory::getDeleted, 0));
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Map<Long, String> nameMap = new HashMap<Long, String>(categories.size());
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for (LiveCourseCategory category : categories) {
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nameMap.put(category.getId(), trimToEmpty(category.getName()));
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}
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return nameMap;
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}
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/**
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* 向分类主键列表中追加有效主键，避免空值干扰批量查询。
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*/
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private void addCategoryId(List<Long> categoryIds, Long categoryId) {
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if (categoryId != null && !categoryIds.contains(categoryId)) {
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categoryIds.add(categoryId);
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}
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}
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/**
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* 将首页推荐健康科普转换为首页宫格卡片响应。
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*/
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private List<AppHomeFeaturedHealthPopularizationVO> toPopularizationCards(List<HealthPopularization> items) {
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if (items == null || items.isEmpty()) {
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return Collections.emptyList();
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}
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List<AppHomeFeaturedHealthPopularizationVO> result =
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new ArrayList<AppHomeFeaturedHealthPopularizationVO>(items.size());
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for (HealthPopularization item : items) {
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AppHomeFeaturedHealthPopularizationVO vo = new AppHomeFeaturedHealthPopularizationVO();
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vo.setId(item.getId());
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vo.setTitle(trimToEmpty(item.getTitle()));
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vo.setCoverImage(trimToEmpty(item.getCoverImg()));
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vo.setContentType(item.getContentType());
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vo.setClickCount(defaultNumber(item.getClickCount()));
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result.add(vo);
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}
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return result;
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}
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/**
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* 兜底空数字字段，避免前端展示出现空值。
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*/
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private Integer defaultNumber(Integer value) {
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return value == null ? 0 : value;
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}
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/**
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* 将可空文本转换为前端可直接消费的空字符串。
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*/
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private String trimToEmpty(String value) {
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if (value == null) {
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return "";
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}
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String trimmed = value.trim();
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return trimmed.isEmpty() ? "" : trimmed;
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}
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}
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