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.context.BaseContext;
  import com.sky.dto.CategoryDTO;
  import com.sky.dto.CategoryPageQueryDTO;
  import com.sky.entity.Category;
  import com.sky.entity.Employee;
  import com.sky.exception.DeletionNotAllowedException;
  import com.sky.mapper.CategoryMapper;
  import com.sky.mapper.DishMapper;
  import com.sky.mapper.EmployeeMapper;
  import com.sky.mapper.SetmealMapper;
  import com.sky.result.PageResult;
  import com.sky.service.CategoryService;
  import org.springframework.beans.BeanUtils;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.stereotype.Service;
  
  import java.time.LocalDateTime;
  import java.util.List;
  
  /**
   * @version 1.0
   * @Author Imak
   * @Date 2024/8/6 20:36
   * @注释
   */
  @Service
  public class CategoryServiceImpl implements CategoryService {
      @Autowired
      private DishMapper dishMapper;
  
      @Autowired
      private SetmealMapper setmealMapper;
  
      @Autowired
      private CategoryMapper categoryMapper;
  
      /**
       * 分类分页查询
       * @param categoryPageQueryDTO
       * @return
       */
      public PageResult pageQuery(CategoryPageQueryDTO categoryPageQueryDTO) {
          // limit 0,10
          //分页查询
          PageHelper.startPage(categoryPageQueryDTO.getPage(),categoryPageQueryDTO.getPageSize());
  
  
          Page<Category> page=categoryMapper.pageQuery(categoryPageQueryDTO);
          long total = page.getTotal();
          List<Category> records = page.getResult();
  
          return new PageResult(total, records);
      }
  
      /**
       * 修改分类
       * @param categoryDTO
       */
      public void update(CategoryDTO categoryDTO) {
          Category category=new Category();
          BeanUtils.copyProperties(categoryDTO,category);//因为update接收的是Category类型，先进行转换
  
  
  
          categoryMapper.update(category);
      }
  
      /**
       * 启用禁用分类
       * @param status
       * @param id
       */
      public void startOrStop(Integer status, Long id) {
          Category category=Category.builder().status(status).id(id).build();
          categoryMapper.update(category);
      }
  
      /**
       * 新增分类
       * @param categoryDTO
       */
      public void save(CategoryDTO categoryDTO) {
          Category category=new Category();
          BeanUtils.copyProperties(categoryDTO,category);
  
          //设置其他属性
          category.setStatus(StatusConstant.DISABLE);
  
  
          categoryMapper.insert(category);
      }
  
      /**
       * 删除分类
       * @param id
       */
      public void deleteById(Long id) {
          //查询当前分类是否关联了菜品
          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套餐
          count=setmealMapper.countByCategoryId(id);
          if(count>0){
              //当前分类下有套餐,不能删除
              throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
          }
          //删除分类
          categoryMapper.deleteById(id);
  
      }
  
      /**
       * 根据类型查询分类
       * @param type
       * @return
       */
      public List<Category> list(Integer type) {
          return categoryMapper.list(type);
      }
  }
  