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.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
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.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品
     *
     * @param dishDTO
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        //向菜品表插入数据（一条）
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.insert(dish);

        //获取Insert语句生成的主键值
        Long id = dish.getId();

        //向口味表插入N条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && !flavors.isEmpty()) {
            //遍历flavors，插入id
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(id));
            //批量插入
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分页查询
     *
     * @param pageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO pageQueryDTO) {
        //设置分页
        PageHelper.startPage(pageQueryDTO.getPage(), pageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(pageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 菜品批量删除
     *
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断菜品是否能够删除
        //是否有起售中菜品
        for (Long id : ids) {
            Dish dish = dishMapper.selectById(id);
            if (dish.getStatus().equals(StatusConstant.ENABLE)) {
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //是否关联套餐
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && !setmealIds.isEmpty()) {
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品
        /*for (Long id : ids) {
            dishMapper.deleteById(id);
            //删除菜品口味
            dishFlavorMapper.deleteByDishId(id);
        }*/
        dishMapper.deleteByIds(ids);
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品及口味
     *
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品
        Dish dish = dishMapper.selectById(id);

        //根据菜品id查询口味
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        //封装到DishVO对象
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 修改菜品基本信息（及口味）
     *
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        //修改菜品基本信息
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);

        //删除原有口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入新的口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && !flavors.isEmpty()) {
            //设置dishId
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dish.getId()));
            //插入新的口味数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> selectByCategoryId(Long categoryId) {
        return dishMapper.selectByCategoryId(categoryId);
    }

    /**
     * 菜品起售停售
     * @param status
     * @param id
     */
    @Override
    @Transactional
    //TODO 菜品关联套餐状态
    public void startOrStop(Integer status, Long id) {
        //更新菜品状态
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
        //更新菜品所关联套餐的状态

    }
}