'use strict';


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

class GroupService extends CrudService {
  constructor(ctx) {
    super(ctx, 'group');
    this.model = this.ctx.model.Group;
  }

  async insert(data) {
    const { groupid, stuid, stuname } = data;
    const group = await this.model.findById(groupid);
    const stuids = [];
    for (const student of group.students) {
      stuids.push(student.stuid);
    }
    if (stuids.includes(stuid)) {
      throw new BusinessError(ErrorCode.DATA_EXIST, '您已加入该组，请勿重复操作');
    } else {
      group.students.push({ stuid, stuname });
      await group.save();
    }
  }

  async exit(data) {
    const { groupid, stuid } = data;
    const group = await this.model.findById(groupid);
    const students = group.students;
    for (const student of students) {
      if (student.stuid === stuid) {
        students.remove(student);
      }
    }
    await group.save();
  }
}


module.exports = GroupService;