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.PrivatizeEnum;
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.ExCourse;
import com.gkhy.exam.system.mapper.ExCourseChapterMapper;
import com.gkhy.exam.system.mapper.ExCourseMapper;
import com.gkhy.exam.system.mapper.ExCoursePhaseMapper;
import com.gkhy.exam.system.service.ExCourseService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * <p>
 * 课程表 服务实现类
 * </p>
 *
 * @author kzy
 * @since 2024-06-05 15:07:36
 */
@Service
public class ExCourseServiceImpl extends ServiceImpl<ExCourseMapper, ExCourse> implements ExCourseService {
    @Autowired
    private ExCourseChapterMapper courseChapterMapper;
    @Autowired
    private ExCoursePhaseMapper coursePhaseMapper;

    @Override
    public CommonPage selectCourseList(ExCourse course) {
        SysUser user= SecurityUtils.getLoginUser().getUser();
        if(!user.getUserType().equals(UserTypeEnum.SYSTEM_USER.getCode())){
            course.setCompanyId(user.getCompanyId());
        }
        PageUtils.startPage();
        List<ExCourse> courseList=baseMapper.selectCourseList(course);
        return CommonPage.restPage(courseList);
    }

    @Override
    public CommonPage selectApproveCourseList(ExCourse course){
        course.setState(ApproveStatusEnum.APPROVED.getCode());
        return selectCourseList(course);
    }

    @Override
    public ExCourse selectCourseById(Long courseId) {
        ExCourse course= baseMapper.selectCourseById(courseId);
        if(course.getPrivatize().equals(PrivatizeEnum.PUBLIC.getCode())){
            return course;
        }
        SysUser currentUser=SecurityUtils.getLoginUser().getUser();
        if(currentUser.getUserType().equals(UserTypeEnum.SYSTEM_USER.getCode())){
            return course;
        }
        if(!course.getCompanyId().equals(currentUser.getCompanyId())){
            throw new ApiException("无权限查看其它企业课程");
        }
        return course;
    }

    @Override
    public int insertCourse(ExCourse course) {
        if(!checkNameUnique(course)){
            throw new ApiException("课程名称已存在");
        }
        checkUserAllowed(course);
        if(SecurityUtils.getLoginUser().getUser().getUserType().equals(UserTypeEnum.SYSTEM_USER.getCode())){
            course.setState(ApproveStatusEnum.APPROVED.getCode());
        }else{
            course.setState(ApproveStatusEnum.APPROVING.getCode());
        }
        int row =baseMapper.insert(course);
        if(row<1){
            throw new ApiException("新增课程失败");
        }
        return row;
    }

    @Override
    public int updateCourse(ExCourse course) {
        if(!checkNameUnique(course)){
            throw new ApiException("课程名称已存在");
        }
        checkUserAllowed(baseMapper.selectById(course.getId()));
        int row =baseMapper.updateById(course);
        if(row<1){
            throw new ApiException("更新课程失败");
        }
        return row;
    }

    public void checkUserAllowed(ExCourse course) {
        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(course.getCompanyId())){
            throw new ApiException("没有权限操作其他企业课程");
        }
        if(course.getId()!=null){
            if(course.getState().equals(ApproveStatusEnum.APPROVED.getCode())){
                throw new ApiException("已审批的课程不能再修改");
            }
        }
    }

    @Override
    public int deleteCourseById(Long courseId) {
        //校验课程是否被分配/是否存在字章节
        checkUserAllowed(baseMapper.selectById(courseId));
        Integer phaseCount= coursePhaseMapper.selectCountByCourseId(courseId);
        if(phaseCount>0){
            throw new ApiException("课程已分配，不能删除");
        }
        Integer chapterCount=courseChapterMapper.selectCountByCourseId(courseId);
        if(chapterCount>0){
            throw new ApiException("课程下存在章节，不能删除");
        }
        int row =baseMapper.deleteByCourseId(courseId);
        if(row<1){
            throw new ApiException("删除课程失败");
        }
        return row;
    }

    @Override
    public boolean checkNameUnique(ExCourse course) {
        Long courseId=course.getId()==null?-1L:course.getId();
        ExCourse cou= baseMapper.checkNameUnique(course.getName());
        if(cou!=null&&cou.getId().longValue()!=courseId.longValue()){
            return UserConstant.NOT_UNIQUE;
        }
        return UserConstant.UNIQUE;
    }

    @Override
    public int doApprove(ExCourse course) {
        ExCourse existCourse=baseMapper.selectById(course.getId());
        checkUserAllowed(existCourse);
        int row=baseMapper.updateById(course);
        if(row<1){
            throw new ApiException("审批失败");
        }
        return row;
    }
}