HarmonyOS 鸿蒙Next智能推荐系统实现

智能推荐系统通过分析用户学习行为，提供个性化的学习建议。

推荐算法设计：

class SmartRecommendService {
  // 获取今日推荐卡片
  async getTodayRecommendCards(): Promise<RecommendCard[]> {
    const cards: RecommendCard[] = [];
    // 1. 错题回顾推荐
    const wrongCount = await answerRecordService.getWrongQuestionCount();
    if (wrongCount > 0) {
      cards.push({
        type: RecommendType.WRONG_REVIEW,
        title: '错题回顾',
        subtitle: '巩固薄弱知识点',
        count: Math.min(wrongCount, 20),
        color: '#E8636C'
      });
    }
    // 2. 薄弱科目推荐
    const weakSubject = await this.getWeakestSubject();
    if (weakSubject) {
      cards.push({
        type: RecommendType.WEAK_POINT,
        title: '薄弱攻克',
        subtitle: weakSubject.subjectName,
        count: 15,
        color: '#3B82F6',
        subjectId: weakSubject.subjectId
      });
    }
    // 3. 学习目标推荐
    const todayStats = await answerRecordService.getTodayStatistics();
    const remainingGoal = Math.max(0, 50 - todayStats.total);
    if (remainingGoal > 0) {
      cards.push({
        type: RecommendType.NEW_LEARN,
        title: '继续学习',
        subtitle: `距今日目标还差 ${remainingGoal} 题`,
        count: Math.min(remainingGoal, 30),
        color: '#10B981'
      });
    }
    return cards;
  }
  // 分析最薄弱科目
  async getWeakestSubject(): Promise<SubjectProgress | null> {
    const progressList = await this.getAllSubjectProgress();
    // 筛选出有做过题目但正确率较低的科目
    const weakSubjects = progressList.filter(p =>
      p.completedCount > 0 && p.accuracy < 70
    );
    if (weakSubjects.length === 0) {
      // 如果没有薄弱科目，返回进度最低的科目
      const lowProgress = progressList.filter(p => p.progress < 50);
      if (lowProgress.length > 0) {
        lowProgress.sort((a, b) => a.progress - b.progress);
        return lowProgress[0];
      }
      return null;
    }
    // 按正确率排序，返回最低的
    weakSubjects.sort((a, b) => a.accuracy - b.accuracy);
    return weakSubjects[0];
  }
  // 计算掌握程度
  private calculateMasteryLevel(progress: number, accuracy: number): MasteryResult {
    // 综合评分 = 进度 * 0.4 + 正确率 * 0.6
    const score = progress * 0.4 + accuracy * 0.6;
    if (score >= 90) return { level: '精通', color: '#52C41A' };
    if (score >= 75) return { level: '掌握', color: '#1890FF' };
    if (score >= 60) return { level: '熟悉', color: '#FAAD14' };
    if (score >= 30) return { level: '入门', color: '#FF7A45' };
    return { level: '学习中', color: '#FF4D4F' };
  }
}