const express = require('express')
const bodyParser = require('body-parser')
const MongoClient = require('mongodb').MongoClient,
    assert = require('assert')
const url = 'mongodb://127.0.0.1:27017/LogInApp'
const app = express()

app.use(express.static(__dirname));
app.use(bodyParser.urlencoded({
    extended: true
}))

app.post('/registernewuser', (req, res) => {

    const user = {
        login: req.body.user.login,
        email: req.body.user.email,
        password: req.body.user.password
    }

    isThisValueOccupied('login', 'remes', MongoClient, 'users')

    /*insertDocument('users', user, MongoClient)
        .catch(err => console.log(err))
        .then(res.send('Registered'))*/

})

app.listen(3000, () => {
    console.log('Listening on port 3000!')
})

function insertDocument(collection, data, MongoClient) {

    return new Promise((resolve, reject) => {
        MongoClient.connect(url, (err, db) => {

            if (err) reject(err)
            db.collection(collection).insertOne(data)
            db.close()
            resolve()

        })
    })

}

function isThisValueOccupied(property, value, MongoClient, collection) {

    MongoClient.connect(url, (err, db) => {

        if (err) throw err
        const cursor = db.collection(collection).find({login: 'remes'})
        return cursor.count().then(data => data !== 0)
    })

}