package com.mindskip.xzs.service.impl;

import ch.qos.logback.core.joran.util.beans.BeanUtil;
import com.alibaba.fastjson.JSON;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.mindskip.xzs.base.RestResponse;
import com.mindskip.xzs.context.WebContext;
import com.mindskip.xzs.domain.ExamPaperAnswer;
import com.mindskip.xzs.domain.Question;
import com.mindskip.xzs.domain.SelfPractice;
import com.mindskip.xzs.domain.vo.QuestionContentVO;
import com.mindskip.xzs.domain.vo.QuestionVO;
import com.mindskip.xzs.domain.vo.SelfPracticeVO;
import com.mindskip.xzs.repository.QuestionMapper;
import com.mindskip.xzs.repository.QuestionSubjectMapper;
import com.mindskip.xzs.repository.SelfPracticeMapper;
import com.mindskip.xzs.repository.SubjectMapper;
import com.mindskip.xzs.service.SelfPracticeService;
import lombok.RequiredArgsConstructor;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;

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

/**
 * @author：xp
 * @date：2024/5/9 16:16
 */
@Service
@RequiredArgsConstructor
public class SelfPracticeServiceImpl implements SelfPracticeService {

    private final SelfPracticeMapper selfPracticeMapper;
    private final WebContext webContext;
    private final QuestionSubjectMapper questionSubjectMapper;
    private final SubjectMapper subjectMapper;
    private final QuestionMapper questionMapper;

    @Override
    public RestResponse add(SelfPracticeVO vo) {
        SelfPractice entity = new SelfPractice();
        BeanUtils.copyProperties(vo, entity);
        entity.setSubjects(JSON.toJSONString(vo.getSubjects()));
        entity.setCreateTime(new Date());
        entity.setUpdateTime(new Date());
        entity.setDeleted(0);
        entity.setDoNum(0);
        entity.setUserId(webContext.getCurrentUser().getId());
        selfPracticeMapper.add(entity);
        return RestResponse.ok("创建成功");
    }

    @Override
    public RestResponse page(SelfPracticeVO query) {
        if (! Objects.equals(3, webContext.getCurrentUser().getRole())) {
            query.setUserId(webContext.getCurrentUser().getId());
        }
        PageInfo<SelfPracticeVO> info = PageHelper.startPage(query.getPageNum(), query.getPageSize()).doSelectPageInfo(() ->
                selfPracticeMapper.page(query));
        info.getList().stream().forEach(item -> {
            List<Integer> subjects = JSON.parseArray(item.getSubjectString(), Integer.class);
            item.setSubjects(subjects);
            List<String> subjectNames = subjectMapper.selectSubjectName(subjects);
            if (! CollectionUtils.isEmpty(subjectNames)) {
                item.setSubjectNames(subjectNames.stream().collect(Collectors.joining("、")));
            }
            item.setTotalQuestionNum(questionSubjectMapper.countQuestionNum(subjects));
        });
        return RestResponse.ok(info);
    }

    @Override
    public RestResponse remove(List<Integer> ids) {
        selfPracticeMapper.remove(ids);
        return RestResponse.ok("删除成功");
    }

    @Override
    public RestResponse startPractice(Integer id) {
        SelfPractice en = selfPracticeMapper.selectById(id);
        if (Objects.isNull(en)) {
            throw new RuntimeException("练习不存在");
        }
        if (StringUtils.hasText(en.getQuestionIds())) {
            // 生成了题目就直接查
            List<Integer> questionIdList = JSON.parseArray(en.getQuestionIds(), Integer.class);
            List<QuestionVO> vos = questionMapper.getVoByIds(questionIdList);
            jsonQuestion(vos);
            return RestResponse.ok(vos);
        } else {
            // 没生成过就随机生成题目
            List<Integer> subjectIds = JSON.parseArray(en.getSubjects(), Integer.class);
            Integer totalQuestionNum = questionSubjectMapper.countQuestionNum(subjectIds);
            if (totalQuestionNum < en.getQuestionNum()) {
                throw new RuntimeException("你所选的课目题目数量不足");
            }
            // 查询出课目下随机的设定数量题目
            List<QuestionVO> questionVOList = questionSubjectMapper.getRandomQuestionId(subjectIds, en.getQuestionNum());
            List<Integer> ids = questionVOList.stream().map(QuestionVO::getId).collect(Collectors.toList());
            selfPracticeMapper.setQuestionIds(en.getId(), JSON.toJSONString(ids));
            jsonQuestion(questionVOList);
            return RestResponse.ok(questionVOList);
        }
    }

    @Override
    public RestResponse subjectQuestionNum(List<Integer> subjectIds) {
        Integer num = questionSubjectMapper.countQuestionNum(subjectIds);
        return RestResponse.ok(num);
    }


    /**
     * 处理题目内容JSON
     *
     * @param vos
     */
    public void jsonQuestion(List<QuestionVO> vos) {
        vos.stream().forEach(vo -> {
            if (StringUtils.hasText(vo.getContentJson())) {
                QuestionContentVO questionContent = JSON.parseObject(vo.getContentJson(), QuestionContentVO.class);
                vo.setContent(questionContent);
            }
        });
    }
}