dialog-serverless.js

'use strict';
 
const functions = require('firebase-functions');
const admin = require('firebase-admin');
const {WebhookClient} = require('dialogflow-fulfillment');
const {Card, Suggestion} = require('dialogflow-fulfillment');
 
process.env.DEBUG = 'dialogflow:debug'; // enables lib debugging statements
const config = process.env.FIREBASE_CONFIG;

admin.initializeApp({
  credential: admin.credential.cert(config),
  databaseURL: 'ws://medicalchat-hfccsy.firebaseio.com'
});

const ref = admin.database().ref('disease');
exports.dialogflowFirebaseFulfillment = functions.https.onRequest((request, response) => {
  const agent = new WebhookClient({ request, response });
  console.log('Dialogflow Request headers: ' + JSON.stringify(request.headers));
  console.log('Dialogflow Request body: ' + JSON.stringify(request.body));
 
  function welcome(agent) {
    agent.add(`Welcome to my agent!`);
  }
 
  function fallback(agent) {
    agent.add(`I didn't understand`);
    agent.add(`I'm sorry, can you try again?`);
  }
  
  function handleDisease(agent) {
    const disease = JSON.stringify(agent.parameters.disease);
    console.log(`disease is: ${disease}. Type of ${typeof disease}`);
    const diseaseKey = disease.toLowerCase().replace(/ /g, '_').replace(/"/g, '');
    console.log(`Disease key: ${diseaseKey}`);
    agent.add(`Thank you for sharing that information`);

    return ref.child(diseaseKey).once("value").then((data) => {
      console.log('data', JSON.stringify(data), typeof data);
      if (data && data.val()) {
        const value = data.val();
      	agent.add(`Medicine for ${disease} is ${value.medicine}. \n And the symptoms for this disease might be \n ${value.symptoms}`);
      } else {
      	agent.add(`Sorry no medicine found for this dieases`);
      }
    }).catch(err => {
      console.log('error', err);
    }); 
  }

 
  let intentMap = new Map();
  intentMap.set('AskDisease', handleDisease);
  agent.handleRequest(intentMap);
});