'use strict';
const { CrudService } = require('naf-framework-mongoose-free/lib/service');
const { BusinessError, ErrorCode } = require('naf-core').Error;
const _ = require('lodash');
const assert = require('assert');
const { ObjectId } = require('mongoose').Types;

//
class MenusService extends CrudService {
  constructor(ctx) {
    super(ctx, 'menus');
    this.model = this.ctx.model.Dev.Menus;
  }
  async query(query = {}) {
    let list = await this.model.find(query).sort({ order_num: 1 });
    if (list.length > 0) list = JSON.parse(JSON.stringify(list));
    let treeMenu = list.filter(f => !f.parent_id);
    treeMenu = this.treeMenu(list, treeMenu);
    return treeMenu;
  }

  treeMenu(allMenus, nowMenu) {
    for (const nm of nowMenu) {
      const { _id, parent_id } = nm;
      // 查下下级其是否有目录
      let children = allMenus.filter(f => ObjectId(f.parent_id).equals(_id));
      children = this.treeMenu(allMenus, children);
      if (children.length > 0) nm.children = children;
      // 换父级组件的名称
      if (parent_id) {
        const r = allMenus.find(f => ObjectId(f._id).equals(parent_id));
        if (r) nm.parent_name = r.name;
      }
    }
    nowMenu = _.orderBy(nowMenu, [ 'order_num', [ 'asc' ]]);
    return nowMenu;
  }

  async getUserMenu() {
    const userInfo = this.ctx.admin;
    if (!userInfo) return [];
    const userInfoMenu = _.get(userInfo, 'role.menu');
    const userInfoMenuMode = _.get(userInfo, 'role.menu.mode');
    // 全部权限,直接返回
    if (userInfoMenuMode === 'all') return await this.query();
    const userInfoMenuIds = Object.keys(userInfoMenu).filter(f => f !== 'mode');
    let menus = await this.model.find();
    menus = JSON.parse(JSON.stringify(menus));
    const res = this.getParent(menus, userInfoMenuIds);
    return res;
  }
  /**
   * 查找选中的菜单
   * @param {Array} allMenu 树形菜单
   * @param {Array} nowMenu 选中的菜单id
   */
  getParent(allMenu, nowMenu) {
    let arr = [];
    // 递归查找上级
    const checkParent = (menus, tid) => {
      const cparr = [];
      const parent = menus.find(f => ObjectId(f._id).equals(tid));
      if (!parent) return;
      const { parent_id } = parent;
      cparr.push(parent);
      if (!parent_id) return cparr;
      const pp = checkParent(menus, parent_id);
      cparr.push(...pp);
      return cparr;
    };
    nowMenu = allMenu.filter(f => nowMenu.find(nf => f.path === nf));
    for (const nm of nowMenu) {
      arr.push(nm);
      const { parent_id } = nm;
      if (!parent_id) continue;
      const parent = checkParent(allMenu, parent_id);
      arr.push(...parent);
    }
    arr = _.uniqBy(arr, '_id');
    const headLevel = arr.filter(f => !f.parent_id);
    // 变成树形结构
    const toTree = (allMenu, menus) => {
      for (const m of menus) {
        const children = allMenu.filter(f => ObjectId(f.parent_id).equals(m._id));
        toTree(allMenu, children);
        m.children = children;
      }
      return menus;
    };
    arr = toTree(arr, headLevel);
    return arr;
  }
}

module.exports = MenusService;