feat:App首页-精选课程介绍

“mitao”

2026-04-10 78e9de1810cd996a83784027be688789e2e170b6

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package com.tcm.training.admin.app.popularization.service;
 
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.tcm.training.admin.app.popularization.vo.AppHealthPopularizationDetailVO;
import com.tcm.training.admin.live.entity.HealthPopularization;
import com.tcm.training.admin.live.mapper.HealthPopularizationMapper;
import org.springframework.stereotype.Service;
 
/**
 * APP 健康科普详情聚合服务。
 */
@Service
public class AppHealthPopularizationService {
 
    private static final int STATUS_ENABLED = 1;
 
    private final HealthPopularizationMapper healthPopularizationMapper;
 
    /**
     * 注入 APP 健康科普详情所需依赖。
     */
    public AppHealthPopularizationService(HealthPopularizationMapper healthPopularizationMapper) {
        this.healthPopularizationMapper = healthPopularizationMapper;
    }
 
    /**
     * 获取 APP 健康科普详情页数据。
     */
    public AppHealthPopularizationDetailVO detail(Long popularizationId) {
        HealthPopularization item = requireEnabledItem(popularizationId);
        AppHealthPopularizationDetailVO detailVO = new AppHealthPopularizationDetailVO();
        detailVO.setId(item.getId());
        detailVO.setTitle(trimToEmpty(item.getTitle()));
        detailVO.setCoverImage(trimToEmpty(item.getCoverImg()));
        detailVO.setContentType(item.getContentType());
        detailVO.setContentTypeText(resolveContentTypeText(item.getContentType()));
        detailVO.setContent(trimToEmpty(item.getContent()));
        detailVO.setVideoUrl(trimToEmpty(item.getVideoUrl()));
        detailVO.setVideoFileName(trimToEmpty(item.getVideoFileName()));
        return detailVO;
    }
 
    /**
     * 查询启用中的健康科普详情，避免 APP 访问到后台下线内容。
     */
    private HealthPopularization requireEnabledItem(Long popularizationId) {
        HealthPopularization item = healthPopularizationMapper.selectOne(new LambdaQueryWrapper<HealthPopularization>()
                .eq(HealthPopularization::getId, popularizationId)
                .eq(HealthPopularization::getDeleted, 0)
                .eq(HealthPopularization::getStatus, STATUS_ENABLED)
                .last("LIMIT 1"));
        if (item == null) {
            throw new IllegalArgumentException("健康科普不存在");
        }
        return item;
    }
 
    /**
     * 解析内容类型文案，便于前端按类型渲染页面。
     */
    private String resolveContentTypeText(Integer contentType) {
        if (contentType != null && contentType.intValue() == HealthPopularization.CONTENT_TYPE_VIDEO) {
            return "视频";
        }
        return "图文";
    }
 
    /**
     * 将可空文本统一转换为空字符串。
     */
    private String trimToEmpty(String value) {
        if (value == null) {
            return "";
        }
        String trimmed = value.trim();
        return trimmed.isEmpty() ? "" : trimmed;
    }
}