package com.ycl.jxkg.service.impl;

import com.alibaba.fastjson2.JSON;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.conditions.query.LambdaQueryChainWrapper;
import com.ycl.jxkg.context.WebContext;
import com.ycl.jxkg.domain.entity.*;
import com.ycl.jxkg.domain.vo.*;
import com.ycl.jxkg.enums.QuestionTypeEnum;
import com.ycl.jxkg.enums.general.ExamStatusEnum;
import com.ycl.jxkg.enums.general.ExamSubmitTempStatusEnum;
import com.ycl.jxkg.mapper.*;
import com.ycl.jxkg.service.ExamService;
import com.ycl.jxkg.base.Result;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.ycl.jxkg.domain.form.ExamForm;
import com.ycl.jxkg.domain.query.ExamQuery;
import org.springframework.stereotype.Service;
import lombok.RequiredArgsConstructor;
import com.ycl.jxkg.utils.PageUtil;
import org.springframework.beans.BeanUtils;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.stream.Collectors;

/**
 * 考试 服务实现类
 *
 * @author xp
 * @since 2024-06-11
 */
@Service
@RequiredArgsConstructor
public class ExamServiceImpl extends ServiceImpl<ExamMapper, Exam> implements ExamService {

    private final ExamMapper examMapper;
    private final WebContext webContext;
    private final QuestionMapper questionMapper;
    private final ExamSubmitTempMapper examSubmitTempMapper;
    private final ClassesUserMapper classesUserMapper;
    private final ExamPaperMapper examPaperMapper;

    /**
     * 添加
     *
     * @param form
     * @return
     */
    @Override
    public Result add(ExamForm form) {
        Exam entity = ExamForm.getEntityByForm(form, null);
        entity.setStatus(ExamStatusEnum.getStatusByTime(form.getStartTime(), form.getEndTime(), null));
        entity.setTeacherId(webContext.getCurrentUser().getId());
        baseMapper.insert(entity);
        return Result.ok("添加成功");
    }

    /**
     * 修改
     *
     * @param form
     * @return
     */
    @Override
    public Result update(ExamForm form) {
        Exam entity = baseMapper.selectById(form.getId());
        // 为空抛IllegalArgumentException，做全局异常处理
        Assert.notNull(entity, "记录不存在");
        BeanUtils.copyProperties(form, entity);
        entity.setStatus(ExamStatusEnum.getStatusByTime(form.getStartTime(), form.getEndTime(), null));
        baseMapper.updateById(entity);
        return Result.ok("修改成功");
    }

    /**
     * 批量删除
     *
     * @param ids
     * @return
     */
    @Override
    public Result remove(List<String> ids) {
        baseMapper.deleteBatchIds(ids);
        return Result.ok("删除成功");
    }

    /**
     * id删除
     *
     * @param id
     * @return
     */
    @Override
    public Result removeById(String id) {
        baseMapper.deleteById(id);
        return Result.ok("删除成功");
    }

    /**
     * 分页查询
     *
     * @param query
     * @return
     */
    @Override
    public Result page(ExamQuery query) {
        IPage<ExamVO> page = PageUtil.getPage(query, ExamVO.class);
        baseMapper.getPage(page, query);
        page.getRecords().stream().forEach(item -> {
            if (! StringUtils.hasText(item.getClassName())) {
                item.setClassName("班级不存在或被删除");
                item.setClassesId(null);
            }
            if (! StringUtils.hasText(item.getExamPaperName())) {
                item.setExamPaperName("试卷不存在或被删除");
                item.setExamPaperId(null);
            }
        });
        return Result.ok().data(page.getRecords()).total(page.getTotal());
    }

    /**
     * 根据id查找
     *
     * @param id
     * @return
     */
    @Override
    public Result detail(Integer id) {
        ExamVO vo = baseMapper.getById(id);
        Assert.notNull(vo, "记录不存在");
        return Result.ok().data(vo);
    }

    /**
     * 列表
     *
     * @return
     */
    @Override
    public Result all() {
        List<Exam> entities = baseMapper.selectList(null);
        List<ExamVO> vos = entities.stream()
                .map(entity -> ExamVO.getVoByEntity(entity, null))
                .collect(Collectors.toList());
        return Result.ok().data(vos);
    }

    @Override
    public Result examSubmit(ExamSubmitVO submitData) {
        // 校验
        Exam exam = examMapper.selectById(submitData.getExamId());
        if (Objects.isNull(exam)) {
            throw new RuntimeException("该考试不存在");
        }
        // 判断单选、多选、判断题对错
        List<Integer> questionIds = submitData.getQuestionList().stream().map(DoQuestionVO::getId).collect(Collectors.toList());
        List<Question> questionList = questionMapper.getAnswerInfo(questionIds);
        Map<Integer, Question> answerMap = questionList.stream().collect(Collectors.toMap(Question::getId, entity -> entity));
        submitData.getQuestionList().stream().forEach(item -> {
            Question question = answerMap.get(item.getId());
            if (Objects.nonNull(question)
                    && (QuestionTypeEnum.SingleChoice.getCode().equals(question.getQuestionType())
                    || QuestionTypeEnum.MultipleChoice.getCode().equals(question.getQuestionType())
                    || QuestionTypeEnum.TrueFalse.getCode().equals(question.getQuestionType())
            )) {
                String correct = question.getCorrect();
                if (QuestionTypeEnum.MultipleChoice.getCode().equals(question.getQuestionType())) {
                    // 如果是选择题，那么将答案转为list
                    List<String> answerList = JSON.parseArray(correct, String.class);
                    item.setRight(answerList.containsAll(item.getAnswerList()));
                } else {
                    item.setRight(question.getCorrect().equals(item.getAnswer()));
                }
            }
        });
        // 阅卷后才往exam_paper_answer保存考试成绩、以及保存到exam_paper_customer_answer
        // 现在只需要保存到一张临时表
        // 该接口是主动提交，所以状态都设置为完成，以便后续老师阅卷
        saveTempExam(submitData, ExamSubmitTempStatusEnum.FINISH);
        return Result.ok();
    }

    @Override
    public Result timingSubmit(ExamSubmitVO submitData) {
        saveTempExam(submitData, ExamSubmitTempStatusEnum.TEMP);
        return Result.ok();
    }

    /**
     * 保存临时试卷
     *
     * @param submitData  前端传递的试卷数据
     * @param status  试卷的状态
     */
    public void saveTempExam(ExamSubmitVO submitData, ExamSubmitTempStatusEnum status) {
        ExamSubmitTemp one = new LambdaQueryChainWrapper<>(examSubmitTempMapper)
                .eq(ExamSubmitTemp::getExamId, submitData.getExamId())
                .eq(ExamSubmitTemp::getUserId, webContext.getCurrentUser().getId())
                .one();
        if (Objects.nonNull(one)) {
            if (ExamSubmitTempStatusEnum.FINISH.equals(one.getStatus())) {
                return;
            }
            one.setDoTime(submitData.getDoTime());
            one.setExamSubmit(JSON.toJSONString(submitData.getQuestionList()));
            one.setCreateTime(new Date());
            one.setStatus(status);
            examSubmitTempMapper.updateById(one);
        } else {
            ExamSubmitTemp examSubmitTemp = new ExamSubmitTemp();
            examSubmitTemp.setExamId(submitData.getExamId());
            examSubmitTemp.setDoTime(submitData.getDoTime());
            examSubmitTemp.setStatus(status);
            examSubmitTemp.setUserId(webContext.getCurrentUser().getId());
            examSubmitTemp.setExamSubmit(JSON.toJSONString(submitData.getQuestionList()));
            examSubmitTemp.setMarkPaperStatus(ExamSubmitTempStatusEnum.TEMP);
            examSubmitTempMapper.insert(examSubmitTemp);
        }
    }

    @Override
    public Result getMarkPaperInfo(Integer id) {
        Exam exam = baseMapper.selectById(id);
        if (Objects.isNull(exam)) {
            throw new RuntimeException("该考试不存在");
        }
        ExamPaper examPaper = examPaperMapper.selectById(exam.getExamPaperId());
        if (Objects.isNull(examPaper)) {
            throw new RuntimeException("考试试卷不存在");
        }
        List<ExamSubmitTemp> examSubmitTempList = new LambdaQueryChainWrapper<>(examSubmitTempMapper)
                .eq(ExamSubmitTemp::getExamId, id)
                .list();
        // 参考人数
        Integer joinExamNum = examSubmitTempList.size();
        // 参考但未完成提交人数
        Integer joinButNotFinishedNum = Math.toIntExact(examSubmitTempList.stream().filter(item -> ExamSubmitTempStatusEnum.TEMP.equals(item.getStatus())).count());

        List<StudentExamInfoVO> studentExamList = classesUserMapper.getClassesUserList(exam.getClassesId());
        // 应考人数
        Integer shouldUserNum = studentExamList.size();

        studentExamList.stream().forEach(item -> {
            if (StringUtils.hasText(item.getExamSubmit())) {
                item.setQuestionList(JSON.parseArray(item.getExamSubmit(), DoQuestionVO.class));
            }
        });

        MarkPaperVO markPaperVO = new MarkPaperVO();
        markPaperVO.setExamName(exam.getExamName());
        markPaperVO.setExamId(exam.getId());
        markPaperVO.setJoinButNotFinishNum(joinButNotFinishedNum);
        markPaperVO.setShouldJoinNum(shouldUserNum);
        markPaperVO.setStudentExamInfoVOList(studentExamList);
        markPaperVO.setMissJoinNum(shouldUserNum - joinExamNum);
        markPaperVO.setJoinNum(joinExamNum);
        markPaperVO.setExamPaperName(examPaper.getName());
        markPaperVO.setSuggestTime(examPaper.getSuggestTime());
        return Result.ok().data(markPaperVO);
    }
}