'use strict';
const Subscription = require('egg').Subscription;
const { ObjectId } = require('mongoose').Types;
class ClearApply extends Subscription {
  // 通过 schedule 属性来设置定时任务的执行间隔等配置
  static get schedule() {
    return {
      interval: '1h', // 1 分钟间隔
      type: 'worker', // 指定所有的 worker 都需要执行
    };
  }

  // 执行函数:清除错误申请(没有学科或者期,教师的申请数据)
  async subscribe() {
    const settingModel = this.ctx.model.Setting;
    const applyModel = this.ctx.model.Apply;
    const trainModel = this.ctx.model.Trainplan;
    const teacherModel = this.ctx.model.Teacher;
    const subjectModel = this.ctx.model.Subject;
    const defaultSetting = await settingModel.findOne();
    // 查出默认数据
    const tranPlan = await trainModel.findOne({ _id: defaultSetting.planid }).lean();
    const allTeacher = await teacherModel.find({}).lean();
    const allSubject = await subjectModel.find({}).lean();
    // 分两步:1,期id分开:不在任何一个计划中的&在计划中的; 2. 在计划中的.查看科目和授课教师是否存在.日子过没过期
    const termids = tranPlan.termnum.map(i => ObjectId(i._id).toString());
    const startDate = `${tranPlan.year}-01-01`;
    const endDate = `${tranPlan.year}-12-31`;
    const thisYearPlan = await applyModel.find({ date: { $gte: startDate, $lte: endDate } }).lean();
    const inTermPlans = thisYearPlan.filter(f => termids.includes(f.termid));
    const notInTermPlans = thisYearPlan.filter(f => !termids.includes(f.termid));
    const errorList = inTermPlans.filter(f => !(allTeacher.find(t => ObjectId(t._id).equals(f.teacherid)) && allSubject.find(s => ObjectId(s._id).equals(f.subid))));
    const deleteIds = [ ...errorList.map(i => ObjectId(i._id).toString()), ...notInTermPlans.map(i => ObjectId(i._id).toString()) ];
    await applyModel.deleteMany({ _id: deleteIds });
  }
}

module.exports = ClearApply;