var dbName = 'platform-interview';
var user = 'platform-interviewee';
var password = 'plaid';
var server = 'leranf-interview.plaid.com:27017/';
var url = 'mongodb://' + user + ':' + password + '@' + server + dbName;
var MongoClient = require('mongodb').MongoClient;
var fs = require('fs');

var serialize = function (client_id, item_id, institution_type) {
  return new Buffer(client_id + ',' + item_id + ',' + institution_type, 'utf8').toString('base64');
};

MongoClient.connect(url, function(err, db) {
  db.collection('items').find().toArray(function(err, data) {
    var tokens = '';

    data.forEach(function(item) {
      var newToken = serialize(item._client, item._id, item.institution_type) + '\n';
      tokens += newToken;
    });

    fs.writeFile('tokens.txt', tokens, 'utf8', function (err, data) {
      if (err) {
        console.log(err);
      } else {
        console.log('created new-line text file with all access-tokens');
      }
    });

    db.close();
  });
});