const mongoose = require('mongoose');
mongoose.connect('mongodb://backone_inspect:backone_inspect@mongodb.prod.proit.id:27017/backone_inspect_0').then(async () => {
  const db = mongoose.connection.db;
  const raw = await db.collection('countrystats').aggregate([
    { $group: {
        _id: '$country_name',
        download: { $sum: '$download' },
        upload: { $sum: '$upload' },
        flow_count: { $sum: { $ifNull: ['$flows', 1] } },
        country_code: { $first: '$country_name' }
    }},
    { $sort: { download: -1 } },
    { $limit: 200 }
  ]).toArray();
  console.log(raw.length, 'countries returned');
  console.log(raw.slice(0, 10));
  mongoose.disconnect();
});