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.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.SetmealVO;
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;

@Service
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishMapper dishMapper;

    /**
     * 套餐分页查询
     *
     * @param setmealPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        //设置分页
        PageHelper.startPage(setmealPageQueryDTO.getPage(), setmealPageQueryDTO.getPageSize());
        Page<Setmeal> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 新增套餐
     *
     * @param setmealDTO
     */
    @Override
    @Transactional
    public void insert(SetmealDTO setmealDTO) {
        //插入套餐信息
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        setmealMapper.insert(setmeal);

        //插入套餐包含菜品的信息
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        //设置setmealId
        setmealDishes.forEach(setmealDish -> setmealDish.setSetmealId(setmeal.getId()));
        setmealDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 批量删除套餐
     *
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //查看套餐是否有在售状态
        for (Long id : ids) {
            Setmeal setmeal = setmealMapper.selectById(id);
            if (setmeal.getStatus().equals(StatusConstant.ENABLE)) {
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        }

        //批量删除套餐（动态SQL）
        //删除setmeal数据
        setmealMapper.deleteBatch(ids);
        //删除setmeal_dish数据
        setmealDishMapper.deleteBySetmealIds(ids);
    }

    /**
     * 根据id查询套餐（及关联菜品）
     *
     * @param id
     * @return
     */
    @Override
    public SetmealVO getByIdWithSetmealDishes(Long id) {
        SetmealVO setmealVO = new SetmealVO();
        //查询基本套餐信息
        Setmeal setmeal = setmealMapper.selectById(id);
        BeanUtils.copyProperties(setmeal, setmealVO);
        //查询对应菜品信息
        List<SetmealDish> setmealDishes = setmealDishMapper.selectBySetmealId(id);
        setmealVO.setSetmealDishes(setmealDishes);
        return setmealVO;
    }

    /**
     * 修改套餐
     *
     * @param setmealDTO
     */
    @Override
    @Transactional
    public void updateWithSetmealDishes(SetmealDTO setmealDTO) {
        //更新setmeal基本数据
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        setmealMapper.update(setmeal);

        //更新setmeal_dish数据
        //删除原setmeal_dish相关数据
        setmealDishMapper.deleteBySetmealId(setmealDTO.getId());
        //添加setmeal_id
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> setmealDish.setSetmealId(setmealDTO.getId()));
        //插入新的数据
        setmealDishMapper.insertBatch(setmealDTO.getSetmealDishes());
    }

    /**
     * 套餐起售停售
     *
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        //看是否为起售，如果为起售，需要判断其关联的菜品有停售状态
        if (status.equals(StatusConstant.ENABLE)) {
            /*
            获取其关联的菜品信息--setmeal_dish--setmealDishes--遍历->getDishId
            先把dishId放到一个集合中，批量查询该dish_id对应且status为0的菜品信息
            如果查询到，则抛出删除失败异常
            如果没有，则进行下一步，改变状态
             */
            List<SetmealDish> setmealDishes = setmealDishMapper.selectBySetmealId(id);
            List<Long> dishIds = new ArrayList<>();
            setmealDishes.forEach(setmealDish -> dishIds.add(setmealDish.getDishId()));
            List<Dish> dishes = dishMapper.selectByDishIdsAndStatusDisable(dishIds);
            if (dishes != null && !dishes.isEmpty()){
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ENABLE_FAILED);
            }
        }
        //不为起售则直接更改状态
        Setmeal setmeal = Setmeal.builder()
                .status(status)
                .id(id)
                .build();
        setmealMapper.update(setmeal);

    }
}