app-functions.js

/* HELPER FUNCTIONS */

function selectRandomFact() {
    const FACTS_ARRAY = ['description', 'released', 'global', 'regions',
        'geographies', 'platforms', 'categories', 'products', 'cognitive',
        'compliance', 'first', 'certifications', 'competition', 'functions'];

    return FACTS_ARRAY[Math.floor(Math.random() * FACTS_ARRAY.length)];
}

function buildFactResponse(factToQuery, callback) {
    if (factToQuery.toString().trim() === 'random') {
        factToQuery = selectRandomFact();
    }

    mongoClient.connect(COSMOS_DB_CONN_STR, function (err, client) {
        const db = client.db(DB_COLLECTION);
        findFact(db, factToQuery, function (document) {
            client.close();
            if (!document) {
                console.log(`No document returned for value of ${factToQuery}?`);
            }
            return callback(document);
        });
    });
}

function createHeroCard(session, botResponse) {
    return new builder.HeroCard(session)
        .title('Azure Tech Facts')
        .subtitle(botResponse.title)
        .text(botResponse.response)
        .images([
            builder.CardImage.create(session, `${ICON_STORAGE_URL}/${botResponse.image}`)
        ])
        .buttons([
            builder.CardAction.openUrl(session, 'https://azure.microsoft.com', 'Learn more...')
        ]);
}

function createThumbnailCard(session, botResponse) {
    return new builder.ThumbnailCard(session)
        .title('Azure Tech Facts')
        .subtitle(botResponse.title)
        .text(botResponse.response)
        .images([
            builder.CardImage.create(session, `${ICON_STORAGE_URL}/${botResponse.image}`)
        ])
        .buttons([
            builder.CardAction.openUrl(session, 'https://azure.microsoft.com', 'Learn more...')
        ]);
}

function findFact(db, factToQuery, callback) {
    console.log(`fact to query: ${factToQuery}`);
    db.collection(DB_COLLECTION).findOne({"fact": factToQuery})
        .then(function (document) {
            if (!document) {
                console.log(`No document found for fact '${factToQuery}'`);
            }
            console.log(`Document found: ${JSON.stringify(document)}`);
            return callback(document);
        });
}