package com.imed.costaccount.service.impl;

import cn.hutool.core.collection.CollUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.imed.costaccount.common.constants.Constant;
import com.imed.costaccount.common.exception.CostException;
import com.imed.costaccount.common.util.PageUtils;
import com.imed.costaccount.mapper.MenuMapper;
import com.imed.costaccount.model.Menu;
import com.imed.costaccount.model.User;
import com.imed.costaccount.model.dto.MenuSaveDTO;
import com.imed.costaccount.model.vo.MenuVO;
import com.imed.costaccount.service.MenuService;
import com.imed.costaccount.utils.BeanUtil;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;


@Service("menuService")
public class MenuServiceImpl extends ServiceImpl<MenuMapper, Menu> implements MenuService {


    /**
     * 保存菜单
     *
     * @param menuSaveDTO {@link MenuSaveDTO}
     * @param user        {@linkplain User}
     */
    @Override
    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public void saveMenu(MenuSaveDTO menuSaveDTO, User user) {
        // 校验
        this.check(menuSaveDTO);

        Menu menu = BeanUtil.convertObj(menuSaveDTO, Menu.class);
        menu.setHospId(user.getHospId())
                .setModifyTime(System.currentTimeMillis())
                .setModifyUserId(user.getId());

        this.save(menu);
    }


    /**
     * 分页查询菜单列表
     *
     * @param page     页码
     * @param pageSize 每页数据大小
     * @param user     当前登录用户
     * @return 菜单伪列表
     */
    @Override
    public PageUtils selectList(Integer page, Integer pageSize, User user) {
        List<Menu> list = this.list(
                new LambdaQueryWrapper<Menu>().eq(Menu::getHospId, user.getHospId()).orderByAsc(Menu::getOrderNum)
        );
        List<MenuVO> menuVOS = BeanUtil.convertList(list, MenuVO.class);
        List<MenuVO> roots = menuVOS.stream().filter(i -> i.getParentId() == 0).collect(Collectors.toList());
        List<MenuVO> treeVOs = new ArrayList<>();
        for (MenuVO i : roots) {
            List<MenuVO> menus = this.getMenuTree(i, menuVOS);
            treeVOs.addAll(menus);

        }
        return new PageUtils(list,0,0,0);
    }

    /**
     * 递归遍历
     * @param menuVO
     * @param menuVOS
     * @return
     */
    private List<MenuVO> getMenuTree(MenuVO menuVO, List<MenuVO> menuVOS) {
        List<MenuVO> list = new ArrayList<>();
        list.add(menuVO);
        List<MenuVO> children = menuVO.getChildren();
        if (CollUtil.isEmpty(children)) {
            children = new ArrayList<>();
        }
        for (MenuVO j : menuVOS) {
            if (j.getParentId().equals(menuVO.getMenuId())) {
                children.add(j);
            }
            menuVO.setChildren(children);
            this.getMenuTree(j, menuVOS);
        }
        return list;
    }

    /**
     * 校验相关 菜单格式
     * @param menuSaveDTO
     */
    private void check(MenuSaveDTO menuSaveDTO) {
        //上级菜单类型
        int parentType = Constant.MenuType.CATALOG.getValue();
        if (menuSaveDTO.getParentId() != 0) {
            Menu parentMenu = this.getById(menuSaveDTO.getParentId());
            parentType = parentMenu.getType();
        }

        // 如果当前是 目录、菜单
        if (menuSaveDTO.getType() == Constant.MenuType.CATALOG.getValue() ||
                menuSaveDTO.getType() == Constant.MenuType.MENU.getValue()) {
            if (parentType != Constant.MenuType.CATALOG.getValue()) {
                throw new CostException("上级菜单只能为目录类型");
            }
            return;
        }

        // 如果当前是按钮
        if (menuSaveDTO.getType() == Constant.MenuType.BUTTON.getValue()) {
            if (parentType != Constant.MenuType.MENU.getValue()) {
                throw new CostException("上级菜单只能为菜单类型");
            }
            return;
        }
    }
}