server.js for Pager interview

server.js

// author Renato Back (renatopb@gmail.com)

const Hapi = require('hapi');
const MongoClient = require('mongodb').MongoClient;

const server = Hapi.server({
    port: 3000,
    debug: {
        request: ['*']
    }
});

const routes = [
    {
        method: 'GET',
        path: '/locations',
        handler: async (request, h) => {

            const db = server.app.db;
            const locationCollection = db.collection('locations');

            // query all locations
            const documents = await locationCollection.find({}).toArray();
            return documents;
        }
    },
    {
        method: 'GET',
        path: '/locations/{locationId}/items',
        handler: async (request, h) => {

            const db = server.app.db;
            const itemCollection = db.collection('items');
            const locationCollection = db.collection('locations');

            const { locationId: locationIdAsString } = request.params;

            if (!locationIdAsString) {
                // error bad request
            }
            const locationId = Number(locationIdAsString);

            const locations = await locationCollection.find({ locationId }).toArray();
            if (!locations.length) {
                return h.response({}).code(404);
            }

            // query all items from a specific location
            const documents = await itemCollection.find({ locationId }).toArray();
            // const documents = await itemCollection.find({ 'locationId': 1 }).toArray();
            return documents;
        }
    },
    {
        method: 'POST',
        path: '/locations/{locationId}/order',
        handler: async (request, h) => {

            const db = server.app.db;
            const ordersCollection = db.collection('orders');
            const itemsCollection = db.collection("items");

            const { payload } = request;

            // query all locations

            payload.total = 0;

            for (let i = 0; i < payload.items.length; i++) {
                let orderItem = payload.items[i];
                const item = await itemsCollection.findOne({ itemId: orderItem.itemId });
                const totalForItem = (orderItem.quantity * item.price);
                payload.total += totalForItem;
            }

            payload.total = Math.round(payload.total * 100) / 100;

            console.log("stop here");

            // try {
            //     // const document = await ordersCollection.create(payload);
            // } catch (e) {
            //
            // }
            return h.response(payload).code(201);
        }
    }
];

const init = async () => {

    // connect to DB
    const url = 'mongodb://localhost:27017/local-grocery-store';
    const client = new MongoClient(url, {  useNewUrlParser: true });
    await client.connect();

    const db = client.db();
    server.app.db = db;

    console.log("Connected successfully to mongo");

    // routes configuration
    server.route(routes);

    try {
        if (!module.parent) {
            await server.start();
        }
        else {
            await server.initialize();
        }
        return server;
    }
    catch (error) {
        console.error(error);
        process.exit(1);
    }
};

process.on('unhandledRejection', (err) => {

    console.log(err);
    process.exit(1);
});

void async function () {
    if (!module.parent) {
        await init();
    }
}();

module.exports = {
    init
}