package com.gkhy.exam.system.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.gkhy.exam.common.api.CommonPage;
import com.gkhy.exam.common.constant.UserConstant;
import com.gkhy.exam.common.domain.entity.SysUser;
import com.gkhy.exam.common.enums.ApproveStatusEnum;
import com.gkhy.exam.common.enums.UserTypeEnum;
import com.gkhy.exam.common.exception.ApiException;
import com.gkhy.exam.common.utils.PageUtils;
import com.gkhy.exam.common.utils.SecurityUtils;
import com.gkhy.exam.system.domain.ExCourseChapter;
import com.gkhy.exam.system.mapper.ExCourseChapterMapper;
import com.gkhy.exam.system.mapper.ExCourseChapterPeriodMapper;
import com.gkhy.exam.system.mapper.ExCourseMapper;
import com.gkhy.exam.system.service.ExCourseChapterService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * <p>
 * 课程章节表 服务实现类
 * </p>
 *
 * @author kzy
 * @since 2024-06-05 15:07:36
 */
@Service
public class ExCourseChapterServiceImpl extends ServiceImpl<ExCourseChapterMapper, ExCourseChapter> implements ExCourseChapterService {
    @Autowired
    private ExCourseChapterPeriodMapper courseChapterPeriodMapper;
    @Autowired
    private ExCourseMapper courseMapper;

    @Override
    public CommonPage selectChapterList(ExCourseChapter chapter) {
        if(chapter.getCourseId()==null){
            throw new ApiException("课程id不能为空");
        }
        PageUtils.startPage();
        List<ExCourseChapter> chapterList=baseMapper.selectChapterList(chapter);
        return CommonPage.restPage(chapterList);
    }

    @Override
    public ExCourseChapter selectChapterById(Long chapterId) {
        return baseMapper.selectChapterById(chapterId);
    }

    @Override
    @Transactional(rollbackFor = RuntimeException.class)
    public int insertChapter(ExCourseChapter chapter) {
        checkUserAllowed(chapter);
        if(!checkNameUnique(chapter)){
            throw new ApiException("章节名称已存在");
        }
        SysUser user= SecurityUtils.getLoginUser().getUser();
        Long companyId=!user.getUserType().equals(UserTypeEnum.SYSTEM_USER)?user.getCompanyId():null;
        chapter.setCompanyId(companyId);
        int row=baseMapper.insert(chapter);
        if(row<1){
            throw new ApiException("新增章节失败");
        }
        return row;
    }


    @Override
    @Transactional(rollbackFor = RuntimeException.class)
    public int updateChapter(ExCourseChapter chapter) {
        checkUserAllowed(chapter);
        if(!checkNameUnique(chapter)){
            throw new ApiException("章节名称已存在");
        }
        SysUser user= SecurityUtils.getLoginUser().getUser();
        int row=baseMapper.updateById(chapter);
        if(row<1){
            throw new ApiException("更新章节失败");
        }
        return row;
    }

    @Override
    @Transactional(rollbackFor = RuntimeException.class)
    public int deleteChapterById(Long chapterId) {
        //校验课程是否已被分配 ，章节下面是否存在课时
        checkUserAllowed(baseMapper.selectChapterById(chapterId));

        int periodCount=baseMapper.selectPeriodCountById(chapterId);
        if(periodCount>0){
            throw new ApiException("章节下已绑定课时，不能删除");
        }
        int row=baseMapper.deleteById(chapterId);
        if(row<1){
            throw new ApiException("删除章节失败");
        }
        courseChapterPeriodMapper.deletePeriodByChapterId(chapterId);
        return row;
    }

    @Override
    public boolean checkNameUnique(ExCourseChapter chapter) {
        if(chapter.getCourseId()==null){
            throw new ApiException("课程id不能为空");
        }
        Long chapterId=chapter.getId()==null?-1L:chapter.getId();
        ExCourseChapter cc= baseMapper.checkNameUnique(chapter.getName(),chapter.getCourseId());
        if(cc!=null&&cc.getId().longValue()!=chapterId.longValue()){
            return UserConstant.NOT_UNIQUE;
        }
        return UserConstant.UNIQUE;
    }

    @Override
    public List<ExCourseChapter> selectChapterByCourseId(Long courseId) {
        return baseMapper.selectChapterByCourseId(courseId);
    }


    public void checkUserAllowed(ExCourseChapter courseChapter) {
        SysUser currentUser= SecurityUtils.getLoginUser().getUser();
        if(currentUser.getUserType().equals(UserTypeEnum.SYSTEM_USER.getCode())){
            return;
        }
        if(currentUser.getUserType().equals(UserTypeEnum.STUDENT.getCode())){
            throw new ApiException("没有权限操作");
        }
        if(!currentUser.getCompanyId().equals(courseChapter.getCompanyId())){
            throw new ApiException("没有权限操作其他企业课程");
        }
        int state=courseMapper.selectCourseState(courseChapter.getCourseId());
        if(state==ApproveStatusEnum.APPROVED.getCode()){
            throw new ApiException("已审批的课程不能再修改");
        }
    }
}