index.js

'use strict';
 
const {WebhookClient} = require('dialogflow-fulfillment');
const {
  Permission,
  dialogflow,
  Image,
  BasicCard,
  BrowseCarousel,
  BrowseCarouselItem,
  Button,
  Carousel,
  LinkOutSuggestion,
  List,
  MediaObject,
  Suggestions,
  SimpleResponse,
  Table,
 } = require('actions-on-google');
 
const host = 'https://maps.googleapis.com/maps/api/place/findplacefromtext/json?';
const apiKey = 'my key goes here'; 
 
const functions = require('firebase-functions');
const admin = require('firebase-admin');
const app = dialogflow({debug: true});
// initialise DB connection
admin.initializeApp({
  credential: admin.credential.applicationDefault(),
  databaseURL: 'https://mcertificate-27106.firebaseio.com/',
});

process.env.DEBUG = 'dialogflow:debug'; // enables lib debugging statements



app.intent('ask_location', (conv) => {
  // Choose one or more supported permissions to request:
  // NAME, DEVICE_PRECISE_LOCATION, DEVICE_COARSE_LOCATION
  const options = {
    context: 'To help you find a nearby place where you can get your medical certificate made',
    // Ask for more than one permission. User can authorize all or none.
    permissions: ['DEVICE_PRECISE_LOCATION'],
  };
conv.ask(new Permission(options));
});

app.intent('receive_location', (conv, params, permissionGranted) => {
  const {coordinates} = conv.device.location;
  const longitude = conv.device.location.coordinates.longitude;
  const latitude = conv.device.location.coordinates.latitude;
  if (permissionGranted) {
    if (coordinates) {
      //conv.ask(`Your location is longitude: ` + longitude + ` and latitude: ` + latitude);
        return admin.database().ref('hospitals/').once("value").then((snapshot) => {
          var count = 0;
          var temp = "";
          var clong = "";
          var clat = "";
          var countcell = ""; //keep the cell number
          var distance = "";
          var tempdistance = "";
          while(snapshot.child(count).val()){
              clong = snapshot.child(count + '/Longitude').val();
              clat = snapshot.child(count + '/Latitude').val();
              tempdistance = Math.pow((longitude-clong), 2) + Math.pow((latitude-clat), 2);    
              tempdistance = Math.sqrt(tempdistance);
              if(!distance){
              	distance = tempdistance;
              }
              if(tempdistance < distance){
              	distance = tempdistance;
              	countcell = count;
              }
              
              count = count + 1;
          }
          var nstate = snapshot.child(countcell + '/State Name').val();
          var ndistrict = snapshot.child(countcell + '/District Name').val();
          var nsubdistrict = snapshot.child(countcell + '/Subdistrict Name').val();
          var bname = snapshot.child(countcell + '/Facility Name').val();
          var nlongitude = snapshot.child(countcell + '/Longitude').val();
          var nlatitude = snapshot.child(countcell + '/Latitude').val();
          //conv.ask('Min Distance: ' + distance + ', State: ' + nstate + ', District: ' + ndistrict + ', Longitude: ' + nlogitude + ', Latitude: ' + nlatitude);
          var urlmap = 'https://www.google.com/maps/dir/?api=1&origin=' + latitude + ', ' + longitude + '&destination=' + nlatitude + ', ' + nlongitude + '&travelmode=walking';

			//API Works

			var query = 'Museum%20of%20Contemporary%20Art%20Australia&inputtype=textquery&fields=photos,formatted_address,name';
            var data = host + 'query=' + query + '&key=' + apiKey;


			//Basic Card - Check Screen Support
            if (!conv.surface.capabilities.has('actions.capability.SCREEN_OUTPUT')) {
              conv.ask('Sorry, try this on a screen device or select the ' +
                'phone surface in the simulator.');
              return;
            }
          conv.ask(bname + ' is the nearest place to get your medical certificate made.');
conv.ask(new SimpleResponse({
  speech: 'I will tell you the distance to the destination.',
  text: 'distance',
}));
          conv.ask(new Suggestions('Call'));
          // Create a basic card
          conv.ask(new BasicCard({
            text: `Address: to come`,
            subtitle: nsubdistrict + ', ' + ndistrict + ', ' + nstate,
            title: bname,
            buttons: new Button({
              title: 'Open on Google Map',
              url: urlmap,
            }),
            image: new Image({
              url: 'https://maps.googleapis.com/maps/api/staticmap?center=' + nlatitude + ',' + nlongitude + '&zoom=15&size=750x500&markers=color:red%7Clabel:S%7C' + nlatitude + ',' + nlongitude + '&key=I have given my API key here',
              alt: 'Image alternate text',
            }),
            display: 'CROPPED',
          }));
		  
      }); //end return
    }
    else{
       return conv.close('Sorry, I could not figure out where you are.');
    }
  }
  else {
    return conv.ask('Sorry, permission denied.');
  }
});


app.intent('Default Welcome Intent', (conv) => {
    conv.ask('Hello!  How can I help you today?');
});

exports.dialogflowFirebaseFulfillment = functions.https.onRequest(app);