const express = require('express');
const app = express()
var MongoClient = require('mongodb').MongoClient;
var assert = require('assert');
var ObjectId = require('mongodb').ObjectID;
var url = 'XXXXXXXX';

var client;

// GET /families
app.get('/families', (req, res) => {
    var collection = client.collection('families')
    collection.find().toArray(function(err, families)) {
        if(err) {
            res.status(500).send(err)
            return
        }

        res.json(families)
    }
})

// Connect to db and start server
MongoClient.connect(url, function(err, connectedClient) {
    if (err) {
        console.log('Unable to connect to Mongo.')
        process.exit(1)
    }

    client = connectedClient

    insertSampleDocuments((err) => {
        if (err) {
            console.log('Error inserting sample documents: ' + err)
            process.exit(2)
        }
        app.listen(3000, function() {
        console.log('Listening on port 3000...')
    })
    }
})






var insertSampleDocuments = function(db, callback) {
    db.collection('families').insertOne( {
        "id": "PetersenFamily",
        "lastName": "Petersen",
        "parents": [
            { "firstName": "Thomas" },
            { "firstName": "Mary Kay" }
        ],
        "children": [
            { "firstName": "John", "gender": "male", "grade": 7 }
        ],
        "pets": [
            { "givenName": "Fluffy" }
        ],
        "address": { "country": "USA", "state": "WA", "city": "Seattle" }
    }, callback);
};