classifier.js

const mongoose = require('mongoose');
const Twit = require('twit');
const config = require('./config');
let T = new Twit(config);
var NaturalLanguageUnderstandingV1 = require('watson-developer-cloud/natural-language-understanding/v1.js');
var natural_language_understanding = new NaturalLanguageUnderstandingV1({
  username: process.env.USERNAME,
  password: process.env.PASSWORD,
  version_date: process.env.VERSION_DATE,
});

module.exports = params => {
  return new Promise((resolve, reject) => {
    var result;
    T.get('search/tweets', params)
      .then(info => {
        var twitString = '';
        let tweets = info.data.statuses;
        for (let i = 0; i < tweets.length; i++) {
          twitString =
            twitString +
            ' ' +
            tweets[i].text.replace(/[&\/\\#,;.+()$~%.'":*?<>{}]/g, '');
        }
        return twitString;
      })
      .then(data => {
        var parameters = {
          text: data,
          features: {
            entities: {
              emotion: true,
              sentiment: true,
              limit: 1,
            },
          },
        };

        natural_language_understanding.analyze(parameters, function(
          err,
          response
        ) {
          if (err) console.log(err);
          else
            var a = 0,
              b;
          for (var i = 0; i < 5; i++) {
            if (a < Object.values(response.entities[0].emotion)[i])
              a = Object.values(response.entities[0].emotion)[i];
            b = Object.getOwnPropertyNames(response.entities[0].emotion)[i];
            console.log(b)
          }
          var result = {
            name: Object.values(response.entities[0].text)
              .join()
              .toString()
              .replace(/,/g, ''),
            emotion: b,
            value: a,
          };
          resolve(result); 
        });
      });
  });
};