content: package com.sky.service.impl;
  
  import com.github.pagehelper.Page;
  import com.github.pagehelper.PageHelper;
  import com.sky.constant.MessageConstant;
  import com.sky.constant.StatusConstant;
  import com.sky.dto.CategoryDTO;
  import com.sky.dto.CategoryPageQueryDTO;
  import com.sky.entity.Category;
  import com.sky.exception.DeletionNotAllowedException;
  import com.sky.mapper.CategoryMapper;
  import com.sky.mapper.DishMapper;
  import com.sky.mapper.SetmealMapper;
  import com.sky.result.PageResult;
  import com.sky.service.CategoryService;
  import lombok.extern.slf4j.Slf4j;
  import org.springframework.beans.BeanUtils;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.stereotype.Service;
  
  import java.util.List;
  
  /**
   * 分类业务层
   */
  @Service
  @Slf4j
  public class CategoryServiceImpl implements CategoryService {
  
      @Autowired
      private CategoryMapper categoryMapper;
      @Autowired
      private DishMapper dishMapper;
      @Autowired
      private SetmealMapper setmealMapper;
  
      /**
       * 新增分类
       * @param categoryDTO
       */
      public void save(CategoryDTO categoryDTO) {
          Category category = new Category();
          //属性拷贝
          BeanUtils.copyProperties(categoryDTO, category);
  
          //分类状态默认为禁用状态0
          category.setStatus(StatusConstant.DISABLE);
  
          //设置创建时间、修改时间、创建人、修改人
          //category.setCreateTime(LocalDateTime.now());
          //category.setUpdateTime(LocalDateTime.now());
          //category.setCreateUser(BaseContext.getCurrentId());
          //category.setUpdateUser(BaseContext.getCurrentId());
  
          categoryMapper.insert(category);
      }
  
      /**
       * 分页查询
       * @param categoryPageQueryDTO
       * @return
       */
      public PageResult pageQuery(CategoryPageQueryDTO categoryPageQueryDTO) {
          PageHelper.startPage(categoryPageQueryDTO.getPage(),categoryPageQueryDTO.getPageSize());
          //下一条sql进行分页，自动加入limit关键字分页
          Page<Category> page = categoryMapper.pageQuery(categoryPageQueryDTO);
          return new PageResult(page.getTotal(), page.getResult());
      }
  
      /**
       * 根据id删除分类
       * @param id
       */
      public void deleteById(Long id) {
          //查询当前分类是否关联了菜品，如果关联了就抛出业务异常
          Integer count = dishMapper.countByCategoryId(id);
          if(count > 0){
              //当前分类下有菜品，不能删除
              throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_DISH);
          }
  
          //查询当前分类是否关联了套餐，如果关联了就抛出业务异常
          count = setmealMapper.countByCategoryId(id);
          if(count > 0){
              //当前分类下有菜品，不能删除
              throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
          }
  
          //删除分类数据
          categoryMapper.deleteById(id);
      }
  
      /**
       * 修改分类
       * @param categoryDTO
       */
      public void update(CategoryDTO categoryDTO) {
          Category category = new Category();
          BeanUtils.copyProperties(categoryDTO,category);
  
          //设置修改时间、修改人
          //category.setUpdateTime(LocalDateTime.now());
          //category.setUpdateUser(BaseContext.getCurrentId());
  
          categoryMapper.update(category);
      }
  
      /**
       * 启用、禁用分类
       * @param status
       * @param id
       */
      public void startOrStop(Integer status, Long id) {
          Category category = Category.builder()
                  .id(id)
                  .status(status)
                  //.updateTime(LocalDateTime.now())
                  //.updateUser(BaseContext.getCurrentId())
                  .build();
          categoryMapper.update(category);
      }
  
      /**
       * 根据类型查询分类
       * @param type
       * @return
       */
      public List<Category> list(Integer type) {
          return categoryMapper.list(type);
      }
  }
  