const { Types } = require('mongoose');
const Agenda = require('agenda');
const _ = require('lodash');
const { getConnection } = require('../../connectDb.js');
const handleAttendClassJob = require('../../handlers');


class Events {
  setup(app) {
    this.collectionName = 'events';

    // Reuse mongoose connection
    const connection = getConnection();
    this.agenda = new Agenda();
    this.agenda.mongo(
      connection.collection(this.collectionName).conn.db,
      this.collectionName
    );

    // Define jobs
    this.agenda.define('attend class', handleAttendClassJob);


    // Logs
    this.agenda.on('start', job => console.log(`Starting ${job.attrs.name} job`));
    this.agenda.on('complete', job => console.log(`Job ${job.attrs.name} finished`));
    this.agenda.on('fail', (err, job) => console.log(`Job failed with the error ${err}`));

    return this.agenda.start();
  }

  create(data, params) {
    return this.agenda.schedule(data.date, 'attend class', data);
  }

  find(params) {
    return this.agenda.jobs({}, { nextRunAt: -1, 'data.participants': -1 });
  }

  findOneById(id) {
    return this.agenda
      .jobs({ _id: Types.ObjectId(id) })
      .then(results => results[0]);
  }

  async patch(id, attrs, params) {
    console.log(`Patch ${id}`);
    const job = await this.findOneById(id);
    job.attrs = _.merge(job.attrs, attrs);
    return this.agenda.saveJob(job);
  }

  async remove(id) {
    console.log(`Remove ${id}`);
    return this.agenda.cancel({ _id: Types.ObjectId(id) });
  }
}


module.exports = app => app.use('/events', new Events());