Added spinner while sending data.

README.md

@@ -1,20 +1,12 @@
-# sourcesage-dev-test
+# qna-frontend-complete
 
-For Data Science roles:
-Create any application on iOS or android that showcase your knowledge of machine learning/data analytics.
-Make use of price data of commodities by dropping an email to jian.sim@sourcesage.co
+Live test site on http://104.199.175.158/
 
-For Software Engineering roles:
-Create a Q & A application that has the following functionality.
-1. a user can ask a question
-2. a user can answer a question
-Real-time is preferred.
+1. Fire up several browsers
+2. Add Questions
+3. Add Answers
+4. Content should update on all browsers in real-time
 
-You can write this application in whatever languages you prefer.
-For backend developers: We like Python, Erlang (but we really don't mind if you write it in other languages)
-For iOS and Android developers: Do you even have another choice?
-
-You should fork this repository and put your work there. 
-This exercise should take no longer than 4 hours. However, you are not timed
-and you can send us a pull request whenever you finish. (If you have something 
-live going on, even better!)
+Improvements:
+- Store questions and answers on a relational database
+- Code refactoring (for both angular and nodejs)

index.js

@@ -0,0 +1,89 @@
+var express = require('express');
+var app = express();
+var bodyParser = require('body-parser');
+var NodeCache = require('node-cache');
+var cache = new NodeCache({ checkPeriod: 120 });
+var _ = require('lodash');
+var uuid = require('node-uuid');
+
+/**
+  * Common middleware.
+  */
+app.use(express.static(__dirname + '/public'));
+app.use(bodyParser.json());
+
+// TODO: change to a map with uuid as key for faster lookup.
+var questions = [];
+
+cache.set('questions', questions); // Using memory cache to store questions/answers.
+
+/**
+  * Routes.
+  */
+app.get('/', function(req, res) {
+	return res.sendFile(__dirname + '/public/index.html');
+});
+
+app.get('/api/questions', function(req, res) {
+	return res.json(cache.get('questions'));
+});
+
+app.post('/api/questions', function(req, res) {
+	var question = req.body;
+	var questions = cache.get('questions');
+
+	question = new QuestionModel(question.questionString);
+
+	questions.push(question);
+
+	cache.set('questions', questions, function() {
+		io.emit('newQuestionAdded', question);
+		return res.json(question);
+	});
+});
+
+app.post('/api/questions/:questionId/answers', function(req, res) {
+	var questions =  cache.get('questions');
+	var qid = _.findIndex(questions, function(question) {
+		return question.id == req.params.questionId;
+	});
+	var question = questions[qid];
+	var answer = new AnswerModel(req.body.answerString, question.id);
+
+	question.answers.push(answer);
+
+	cache.set('questions', questions, function() {
+		io.emit('newAnswerAdded', { answer: answer, question: question });
+		res.json(answer);
+	});
+});
+
+/**
+  * Models.
+  */
+function QuestionModel(questionString) {
+	return {
+		id: uuid.v4(),
+		timestamp: Date.now(),
+		questionString: questionString || '',
+		answers: []
+	}
+}
+
+function AnswerModel(answerString, questionParentId) {
+	return {
+		id: uuid.v4(),
+		timestamp: Date.now(),
+		answerString: answerString || '',
+		questionParentId:  questionParentId
+	}
+}
+
+
+
+var server = app.listen(80);
+
+var io = require('socket.io')(server);
+io.on('connection', function(socket) {
+	console.log('got a connection');
+});