package com.gkhy.exam.system.service.impl;
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import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
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import com.gkhy.exam.common.constant.UserConstant;
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import com.gkhy.exam.common.domain.entity.SysUser;
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import com.gkhy.exam.common.enums.UserTypeEnum;
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import com.gkhy.exam.common.exception.ApiException;
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import com.gkhy.exam.common.utils.SecurityUtils;
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import com.gkhy.exam.system.domain.SysCategory;
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import com.gkhy.exam.system.mapper.ExCourseMapper;
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import com.gkhy.exam.system.mapper.ExQuestionBankMapper;
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import com.gkhy.exam.system.mapper.SysCategoryMapper;
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import com.gkhy.exam.system.service.SysCategoryService;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Service;
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import java.util.Comparator;
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import java.util.List;
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import java.util.Objects;
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import java.util.stream.Collectors;
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/**
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* <p>
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* 课程分类表 服务实现类
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* </p>
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*
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* @author kzy
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* @since 2024-06-05 11:15:14
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*/
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@Service
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public class SysCategoryServiceImpl extends ServiceImpl<SysCategoryMapper, SysCategory> implements SysCategoryService {
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@Autowired
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private ExCourseMapper courseMapper;
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@Autowired
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private ExQuestionBankMapper questionBankMapper;
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@Override
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public List<SysCategory> selectCategoryList(SysCategory category) {
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List<SysCategory> categoryList=baseMapper.selectCategoryList(category);
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return getChildCategory(categoryList,0L);
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}
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public List<SysCategory> getChildCategory(List<SysCategory> categoryList, Long parentId){
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List<SysCategory> childList=categoryList.stream().filter(m -> Objects.equals(m.getParentId(),parentId)).map(m -> {
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m.setChildren(getChildCategory(categoryList, m.getId()));
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return m;
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}).sorted(Comparator.comparingInt(m -> (m.getSort()==null?0:m.getSort())))
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.collect(Collectors.toList());
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return childList;
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}
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@Override
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public SysCategory selectCategoryById(Long categoryId) {
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return baseMapper.selectById(categoryId);
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}
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@Override
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public int insertCategory(SysCategory category) {
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if(!checkNameUnique(category)){
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throw new ApiException("新增课程分类名称已存在");
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}
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checkUserAllowed();
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int row =baseMapper.insert(category);
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if(row<1){
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throw new ApiException("新增课程分类失败");
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}
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return row;
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}
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@Override
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public int updateCategory(SysCategory category) {
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checkUserAllowed();
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int row=baseMapper.updateById(category);
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if(row<1){
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throw new ApiException("修改课程分类失败");
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}
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return row;
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}
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public void checkUserAllowed() {
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SysUser currentUser= SecurityUtils.getLoginUser().getUser();
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if(currentUser.getUserType().equals(UserTypeEnum.STUDENT.getCode())){
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throw new ApiException("没有权限操作");
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}
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}
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@Override
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public int deleteCategoryById(Long categoryId) {
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//校验课程分类是否存在课程或者题目
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checkUserAllowed();
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int courseCount=courseMapper.selectCountByCategoryId(categoryId);
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if(courseCount>0){
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throw new ApiException("已绑定课程，无法删除");
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}
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int bankCount=questionBankMapper.selectCountByCategoryId(categoryId);
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if(bankCount>0){
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throw new ApiException("已绑定题库，无法删除");
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}
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int row=baseMapper.deleteByCategoryId(categoryId);
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if(row<1){
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throw new ApiException("删除课程分类失败");
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}
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return row;
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}
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@Override
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public boolean checkNameUnique(SysCategory category) {
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if(category.getParentId()==null){
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category.setParentId(0L);
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}
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Long categoryId=category.getId()==null?-1L:category.getId();
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SysCategory ca= baseMapper.checkNameUnique(category.getName(),category.getParentId());
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if(ca!=null&&ca.getId().longValue()!=categoryId.longValue()){
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return UserConstant.NOT_UNIQUE;
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}
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return UserConstant.UNIQUE;
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}
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}
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