const fs = require('fs')
const mongoClient = require('mongodb').MongoClient

const databaseInfo = {
  host: 'host',
  port: 'port',
  user: 'username',
  pass: 'password',
  db: 'database',
  collection: 'collection',
  get url () {
    return `mongodb://${this.user}:${this.pass}@${this.host}:${this.port}/${this.db}`
  }
}

const MONGO_URL = databaseInfo.url
const COLLECTION = databaseInfo.collection

const insertDocuments = (db, data, callback) => {
  const collection = db.collection(COLLECTION)

  collection.insertMany(data, (err, result) => {
    if (err) {
      throw err
    }

    console.log('THE DATA HAS BEEN SAVED.')
    callback(result)
  })
}

mongoClient.connect(MONGO_URL, (err, db) => {
  if (err) {
    throw err
  }

  fs.readFile('./sample.json', 'utf8', (err, data) => {
    if (err) {
      throw err
    }

    insertDocuments(db, JSON.parse(data), () => {
      db.close()
    })
  })
})