rominirani · May 16, 2018 05:28
diff --git a/index.js b/index.js
 const admin = require('firebase-admin');
 const functions = require('firebase-functions');


 //Initialize Firebase
 admin.initializeApp(functions.config().firebase);

 const db = admin.firestore();

 //Number of Questions. We could have evaluated the count of questions, but thats for a future
 //enhancement
 const countQuestions = 2

 //HTML Template for question
 let question_template = ({
    id,
    title,
    option1,
    option2,
    option3,
    option4
 }) => {
    return `
      <!DOCTYPE html>
      <html>
        <head>
        </head>
        <body>
          <h2>Welcome to Countries and their Capitals quiz</h2>
          <form name="quizform" action="/checkanswer" method="POST">
            <input type="hidden" name="id" value="${id}">
            <p>${title}</p>
            <select name="answer">
                <option value="1">${option1}</option>
                <option value="2">${option2}</option>
                <option value="3">${option3}</option>
                <option value="4">${option4}</option>
            </select>
            <input name="submit" type="submit"/>
          </form>
        </body>
      </html>`;
 }

 //HTML Template for correct answer
 let correct_answer_template = () => {
    return `
      <!DOCTYPE html>
      <html>
        <head>
        </head>
        <body>
          <h2>Welcome to Countries and their Capitals quiz</h2>
          <p>Great. Your answer is correct. <a href="/getRandomQuestion">Answer another question</a></p>
        </body>
      </html>`;
 }

 //HTML Template for wrong answer
 let wrong_answer_template = ({
    correct_answer
 }) => {
    return `
      <!DOCTYPE html>
      <html>
        <head>
        </head>
        <body>
          <h2>Welcome to Countries and their Capitals quiz</h2>
          <p>Sorry. The correct is ${correct_answer}. <a href="/getRandomQuestion">Answer another question</a></p>
        </body>
      </html>`;
 }

 //Function to get a random question from the Firestore questions collection
 exports.getRandomQuestion = (req, res) => {

    //Get a random id
    const id = Math.floor(Math.random() * (countQuestions) + 1)
    var questionRef = db.collection('questions').doc(id.toString());
    var getDoc = questionRef.get()
        .then(doc => {
            if (!doc.exists) {
                throw new Error("No such document");
            } else {
                console.log('Document data:', doc.data());
                res.status(200).send(question_template({
                    id: doc.id,
                    title: doc.get('title'),
                    option1: doc.get('option1'),
                    option2: doc.get('option2'),
                    option3: doc.get('option3'),
                    option4: doc.get('option4')
                }));
            }
        })
        .catch(err => {
            console.log('Error getting document', err);
            res.status(400).send('Error');
        });
 }

 //Function to check the answer submitted
 exports.checkanswer = (req, res) => {

    //Extract out the id and the answer
    let id = req.body.id;
    let answer = req.body.answer;

    var questionRef = db.collection('questions').doc(id.toString());
    var getDoc = questionRef.get()
        .then(doc => {
            if (!doc.exists) {
                throw new Error("No such document");
            } else {
                if (doc.get('answer') === answer) {
                    res.status(200).send(correct_answer_template());
                } else {
                    res.status(200).send(wrong_answer_template({
                        correct_answer: getAnswer(doc, doc.get('answer'))
                    }));
                }
            }
        })
        .catch(err => {
            console.log('Error getting document', err);
            res.status(400).send('Error');
        });
 }

 //Retrieve the answer from the Question DocumentRef based on the option provided
 function getAnswer(doc, answer) {
    let answer_text = "";
    switch (answer) {
        case "1":
            answer_text = doc.get('option1');
            break;
        case "2":
            answer_text = doc.get('option2');
            break;
        case "3":
            answer_text = doc.get('option3');
            break;
        case "4":
            answer_text = doc.get('option4');
            break;
    }
    return answer_text;
 }
	const admin = require('firebase-admin');
	const functions = require('firebase-functions');


	//Initialize Firebase
	admin.initializeApp(functions.config().firebase);

	const db = admin.firestore();

	//Number of Questions. We could have evaluated the count of questions, but thats for a future
	//enhancement
	const countQuestions = 2

	//HTML Template for question
	let question_template = ({
	id,
	title,
	option1,
	option2,
	option3,
	option4
	}) => {
	return `
	<!DOCTYPE html>
	<html>
	<head>
	</head>
	<body>
	<h2>Welcome to Countries and their Capitals quiz</h2>
	<form name="quizform" action="/checkanswer" method="POST">
	<input type="hidden" name="id" value="${id}">
	<p>${title}</p>
	<select name="answer">
	<option value="1">${option1}</option>
	<option value="2">${option2}</option>
	<option value="3">${option3}</option>
	<option value="4">${option4}</option>
	</select>
	<input name="submit" type="submit"/>
	</form>
	</body>
	</html>`;
	}

	//HTML Template for correct answer
	let correct_answer_template = () => {
	return `
	<!DOCTYPE html>
	<html>
	<head>
	</head>
	<body>
	<h2>Welcome to Countries and their Capitals quiz</h2>
	<p>Great. Your answer is correct. <a href="/getRandomQuestion">Answer another question</a></p>
	</body>
	</html>`;
	}

	//HTML Template for wrong answer
	let wrong_answer_template = ({
	correct_answer
	}) => {
	return `
	<!DOCTYPE html>
	<html>
	<head>
	</head>
	<body>
	<h2>Welcome to Countries and their Capitals quiz</h2>
	<p>Sorry. The correct is ${correct_answer}. <a href="/getRandomQuestion">Answer another question</a></p>
	</body>
	</html>`;
	}

	//Function to get a random question from the Firestore questions collection
	exports.getRandomQuestion = (req, res) => {

	//Get a random id
	const id = Math.floor(Math.random() * (countQuestions) + 1)
	var questionRef = db.collection('questions').doc(id.toString());
	var getDoc = questionRef.get()
	.then(doc => {
	if (!doc.exists) {
	throw new Error("No such document");
	} else {
	console.log('Document data:', doc.data());
	res.status(200).send(question_template({
	id: doc.id,
	title: doc.get('title'),
	option1: doc.get('option1'),
	option2: doc.get('option2'),
	option3: doc.get('option3'),
	option4: doc.get('option4')
	}));
	}
	})
	.catch(err => {
	console.log('Error getting document', err);
	res.status(400).send('Error');
	});
	}

	//Function to check the answer submitted
	exports.checkanswer = (req, res) => {

	//Extract out the id and the answer
	let id = req.body.id;
	let answer = req.body.answer;

	var questionRef = db.collection('questions').doc(id.toString());
	var getDoc = questionRef.get()
	.then(doc => {
	if (!doc.exists) {
	throw new Error("No such document");
	} else {
	if (doc.get('answer') === answer) {
	res.status(200).send(correct_answer_template());
	} else {
	res.status(200).send(wrong_answer_template({
	correct_answer: getAnswer(doc, doc.get('answer'))
	}));
	}
	}
	})
	.catch(err => {
	console.log('Error getting document', err);
	res.status(400).send('Error');
	});
	}

	//Retrieve the answer from the Question DocumentRef based on the option provided
	function getAnswer(doc, answer) {
	let answer_text = "";
	switch (answer) {
	case "1":
	answer_text = doc.get('option1');
	break;
	case "2":
	answer_text = doc.get('option2');
	break;
	case "3":
	answer_text = doc.get('option3');
	break;
	case "4":
	answer_text = doc.get('option4');
	break;
	}
	return answer_text;
	}