backend/src/main/java/nju/seec/helper/service/impl/QuizServiceImpl.java

package nju.seec.helper.service.impl;

import nju.seec.helper.dao.QuizDAO;
import nju.seec.helper.dao.QuizStudentAnswerDAO;
import nju.seec.helper.dao.SlideDAO;
import nju.seec.helper.dto.LoginUser;
import nju.seec.helper.entity.*;
import nju.seec.helper.service.QuizService;
import nju.seec.helper.util.BOKUtil;
import nju.seec.helper.util.enums.QuizState;
import nju.seec.helper.util.enums.SlideState;
import nju.seec.helper.vo.quiz.QuestionVO;
import nju.seec.helper.vo.quiz.QuizVO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.Assert;

import java.util.*;

@Service
public class QuizServiceImpl implements QuizService {
    @Autowired
    private SlideDAO slideDAO;
    @Autowired
    private QuizDAO quizDAO;
    @Autowired
    private QuizStudentAnswerDAO quizStudentAnswerDAO;
    @Autowired
    private BOKUtil bokUtil;
    @Transactional
    public QuizVO CreateQuiz(String name, Integer uid, SlideState quizTime,
                             Integer slideId, List<String> questions){
        User teacher =new User();
        teacher.setId(uid);
        Slide slide = slideDAO.findSlideById(slideId);
        Course course = new Course();
        course.setId(slide.getCourseId());
        Quiz quiz = new Quiz();

        quiz.setCourse(course);
        quiz.setName(name);
        quiz.setQuestions(questions);
        quiz.setQuizTime(quizTime);
        quiz.setSlide(slide);
        quiz.setTeacher(teacher);
        quiz.setState(quizTime.getNum()<slide.getState().getNum()?QuizState.CLOSED:QuizState.ONGOING);
        quiz=quizDAO.saveAndFlush(quiz);
        return combineQuiz(quiz.getId());
    }

    public QuizVO combineQuiz(Long quizId){
        Assert.notNull(quizId,"QUIZ ID can't be null!");
        final Quiz quizById = quizDAO.findQuizById(quizId);
        final List<QuestionVO> questionVOS = bokUtil.BokFindByIdIn(quizById.getQuestions());
        QuizVO ret= new QuizVO(quizById,questionVOS);
        return ret;
    }
    public QuizVO combineQuizWithAnswer(Long quizId, Integer uid){
        Assert.notNull(quizId,"QUIZ ID can't be null!");
        final Quiz quizById = quizDAO.findQuizById(quizId);
        User student =new User();
        student.setId(uid);
        final Set<QuizStudentAnswer> QuizAnswers = quizStudentAnswerDAO.findByQuizAndStudent(quizById, student);
        List<QuestionVO> questionVOS = bokUtil.BokFindByIdIn(quizById.getQuestions());
        Map<String,QuizStudentAnswer> qsaMap=new HashMap<>(QuizAnswers.size());
        for(QuizStudentAnswer qsa: QuizAnswers){
            qsaMap.put(qsa.getQuestionId(),qsa);
        }
        for(QuestionVO vo:questionVOS){
            if(qsaMap.get(vo.getQuestionId())!=null){
                vo.exAddAnswer(qsaMap.get(vo.getQuestionId()));
            }

        }
        QuizVO ret= new QuizVO(quizById,questionVOS);
        return ret;
    }
}