feat: list upcoming events

addresses part of #28

.env.sample

@@ -12,3 +12,6 @@ GH_OAUTH_TOKEN=
 MC_BASE_URL=https://xxx.api.mailchimp.com/3.0
 MC_LIST_ID=xxxx
 MC_API_KEY=xxxx
+
+DEFAULT_EVENT_IMG=https://user-images.githubusercontent.com/261265/52181980-4ccf9500-2809-11e9-811f-9239fff50ed7.png
+FACEBOOK_GROUP_URL=https://fb.com/groups/devcnairobi

bot/events.js

@@ -0,0 +1,53 @@
+const isURL = require('validator/lib/isURL');
+const firebase = require('../storage/firebase');
+
+// // common functions
+const utils = {
+  validArray(data) {
+    return Array.isArray(data) && data.length > 0;
+  },
+  currentTimestamp() {
+    return Math.floor(new Date().getTime() / 1000);
+  },
+};
+
+const getEventsElems = (events) => {
+  const elems = [];
+  events.forEach((event) => {
+    const elem = {
+      title: event.title,
+      image_url: isURL(String(event.cover_img)) ? String(event.cover_img) : process.env.DEFAULT_EVENT_IMG,
+      subtitle: event.description,
+      buttons: [
+        {
+          type: 'web_url',
+          url: isURL(String(event.url)) ? String(event.url) : process.env.FACEBOOK_GROUP_URL,
+          title: 'View Event',
+        },
+        {
+          type: 'postback',
+          title: '♡ Interested',
+          payload: `event:interest:${event.timestamp}`,
+        },
+      ],
+    };
+    elems.push(elem);
+  });
+  return elems;
+};
+
+const upcomingEvents = (payload, chat) => {
+  firebase.listEvents(null, (data) => {
+    if (utils.validArray(data)) {
+      const elems = getEventsElems(data);
+      chat.sendGenericTemplate(elems);
+    }
+    else {
+      chat.say('No events to display');
+    }
+  });
+};
+
+module.exports = {
+  upcomingEvents,
+};

bot/index.js

@@ -1,8 +1,10 @@
 const BootBot = require('bootbot');
+const createLogger = require('bunyan').createLogger;
+
+const db = require('../storage/firebase');
+const events = require('./events');
 const replies = require('./replies');
 const User = require('./user');
-const db = require('../storage/firebase');
-const createLogger = require('bunyan').createLogger;
 
 // load env variables
 const env = require('dotenv'); // https://github.com/motdotla/dotenv/issues/114
@@ -60,6 +62,13 @@ bot.hear([/^RSVP/], (payload, chat) => {
   db.eventRSVP(payload.sender.id, 2, chat);
 });
 
+/**
+ * Display a list of upcoming events
+ */
+bot.hear([/upcoming events/i], (payload, chat) => {
+  events.upcomingEvents(payload, chat);
+});
+
 // listen for postback
 bot.on('postback', (payload, chat) => {
   // if it's the getting started CTA

storage/firebase.js

@@ -56,4 +56,16 @@ module.exports = {
       }
     });
   },
+
+  listEvents(timestamp, callback) {
+    // TODO: add query to get events >= timestamp once
+    // it is provided
+    const eventsRef = fb.database().ref('/events/');
+    eventsRef.once('value').then(snapshot => {
+      const object = snapshot.val();
+      // convert to array
+      const data = Object.values(object);
+      callback(data);
+    });
+  },
 };