content: package com.itheima.reggie.service.impl;
  
  import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
  import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
  import com.itheima.reggie.common.CustomException;
  import com.itheima.reggie.dto.SetmealDto;
  import com.itheima.reggie.entity.Setmeal;
  import com.itheima.reggie.entity.SetmealDish;
  import com.itheima.reggie.mapper.SetmealMapper;
  import com.itheima.reggie.service.SetmealDishService;
  import com.itheima.reggie.service.SetmealService;
  import lombok.extern.slf4j.Slf4j;
  import org.springframework.beans.BeanUtils;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.stereotype.Service;
  import org.springframework.transaction.annotation.Transactional;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.stream.Collectors;
  
  @Service
  @Slf4j
  public class SetmealServiceImpl extends ServiceImpl<SetmealMapper,Setmeal> implements SetmealService {
  
      @Autowired
      private SetmealDishService setmealDishService;
  
      /**
       * 新增套餐，同时需要保存套餐和菜品的关联关系
       * @param setmealDto
       */
      @Transactional
      public void saveWithDish(SetmealDto setmealDto) {
          //保存套餐的基本信息，操作setmeal，执行insert操作
          this.save(setmealDto);
  
          List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
          setmealDishes.stream().map((item) -> {
              item.setSetmealId(setmealDto.getId());
              return item;
          }).collect(Collectors.toList());
  
          //保存套餐和菜品的关联信息，操作setmeal_dish,执行insert操作
          setmealDishService.saveBatch(setmealDishes);
      }
  
      /**
       * 删除套餐，同时需要删除套餐和菜品的关联数据
       * @param ids
       */
      @Transactional
      public void removeWithDish(List<Long> ids) {
          //select count(*) from setmeal where id in (1,2,3) and status = 1
          //查询套餐状态，确定是否可用删除
          LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper();
          queryWrapper.in(Setmeal::getId,ids);
          queryWrapper.eq(Setmeal::getStatus,1);
  
          int count = this.count(queryWrapper);
          if(count > 0){
              //如果不能删除，抛出一个业务异常
              throw new CustomException("套餐正在售卖中，不能删除");
          }
  
          //如果可以删除，先删除套餐表中的数据---setmeal
          this.removeByIds(ids);
  
          //delete from setmeal_dish where setmeal_id in (1,2,3)
          LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
          lambdaQueryWrapper.in(SetmealDish::getSetmealId,ids);
          //删除关系表中的数据----setmeal_dish
          setmealDishService.remove(lambdaQueryWrapper);
      }
  
      /**
       * 根据id查询套餐内容并回显
       * @param ids
       * @return
       */
      @Override
      public SetmealDto getByIdWithDish(Long ids) {
          //查询套餐的基本信息，从数据表中查询
          Setmeal setmeal = this.getById(ids);
          SetmealDto setmealDto = new SetmealDto();
  
          BeanUtils.copyProperties(setmeal,setmealDto);
  
          //查询当前套餐下的具体菜品
          LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
          queryWrapper.eq(SetmealDish::getSetmealId,ids);
          List<SetmealDish> list = setmealDishService.list(queryWrapper);
          setmealDto.setSetmealDishes(list);
  
          return setmealDto;
      }
  
      /**
       * 修改套餐信息
       * @param setmealDto
       */
      @Override
      public void updateWithDish(SetmealDto setmealDto) {
          //查询套餐状态，确定是否可以修改
          LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
  
          List<Long> list = new ArrayList<>();
          list.add(setmealDto.getId());
          queryWrapper.in(Setmeal::getId,list);
          queryWrapper.eq(Setmeal::getStatus,1);
  
          int count = this.count(queryWrapper);
  
          if(count > 0){
              //如果不能修改，抛出业务运行异常
              throw new CustomException("套餐正在售卖中，不能修改");
          }
  
          //如果可以修改，则先删除表中的对应数据
          this.removeByIds(list);
  
          LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
          lambdaQueryWrapper.in(SetmealDish::getSetmealId,list);
  
          //删除记录套餐中具体餐品的表中的指定数据
          setmealDishService.remove(lambdaQueryWrapper);
  
  
          //saveWithDish(setmealDto);
  
          //保存套餐的基本信息，操作setmeal，执行insert操作
          this.save(setmealDto);
  
          List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
  
          setmealDishes.stream().map((item) -> {
              item.setSetmealId(setmealDto.getId());
              return item;
          }).collect(Collectors.toList());
  
          //保存套餐和菜品的关联信息，操作setmeal_dish,执行insert操作
          setmealDishService.saveBatch(setmealDishes);
      }
  }
  