app.js

/**
 * Module dependencies.
 */

var express = require('express');
var http = require('http');
var path = require('path');
var twilio = require('twilio');
var client = require('twilio')('AC8071f4e79c9ec1e28ac712b696634652', 'e13e174fbee885c77d5a039a1d372356');
var Canvas = require('canvas');
var fs = require('fs');
var request = require('request');

var app = express();

// all environments
app.set('port', process.env.PORT || 5000);
app.use(express.cookieParser('S3CRE7'));
app.use(express.cookieSession());
app.use(express.logger('dev'));
app.use(express.urlencoded());
app.use(app.router);
app.use(express.static(path.join(__dirname, 'public')));

// development only
if ('development' == app.get('env')) {

	app.use(express.errorHandler());

}

/**
 * Receives GET request from Twilio with a message.
 * Determines which route to use based off values stored in a session cookie.
 */

app.get('/tee-text', function(req, res) {

	// Options	
	var colors = ['Green', 'Blue', 'Red', 'Yellow', 'Purple'];
	var sizes = ['sml', 'med', 'lrg'];
	var apiKey = '03ae700441d285b1937cda732868b74180d12fbd';

	// Controller
	if(!req.session.message)
		askSize();
	else if(!req.session.size)
		askColor();
	else if(!req.session.color)
		askQuantity();
	else
		sendQuote();


	// Routes
	function askSize() {

		req.session.message = req.query.Body;

		sendMessage('What size tshirt? Options: sml, med, lrg');

	}

	function askColor() {

		var size = req.query.Body;
		size = size.toLowerCase();

		// Check and see if the size is valid
		if(sizes.indexOf(size) == -1)
			sendMessage('Invalid size. Try again.');
		else
		{
			req.session.size = size;
			sendMessage('What color tshirt? Options: red, blue, yellow, purple, green');
		}

	}

	function askQuantity() {

		var color = req.query.Body;
		color = color.toLowerCase();
		color = color.charAt(0).toUpperCase() + color.slice(1);

		// Check and see if the color is valid
		if(colors.indexOf(color) == -1)
			sendMessage('Invalid color. Try again.');
		else
		{
			// Color fix
			if(color == 'Blue')
				color = 'Royal+Blue';
			else if(color == 'Yellow')
				color = 'Yellow+Haze';
			else if(color == 'Green')
				color = 'Turf+Green';

			req.session.color = color;
			sendMessage('How many tshirts do you want?');
		}

	}

	function sendQuote() {

		var quantity = req.query.Body;
		quantity = parseInt(quantity, 10);

		// Check and see if quantity is a number
		if(!isInt(quantity))
			sendMessage('Invalid quantity. Try again.');
		else
		{
			var url = 'https://www.shirts.io/api/v1/quote/?api_key=' + apiKey + '&garment[0][product_id]=1&garment[0][color]=' + req.session.color + '&garment[0][sizes][' + req.session.size + ']=' + quantity + '&print[front][color_count]=1';
			request(url, function (error, response, body) {

				if (!error && response.statusCode == 200) {
					makeImage();

					// Parse JSON
					body = JSON.parse(body);

					// Reset session
					req.session = null;

					sendMessage('Your total comes to $' + body.result.total + ' | Check out the design http://glacial-headland-8432.herokuapp.com/images/' + req.query.From + '.png');
				}
				else
				{
					console.log(error);
					console.log(response.statusCode);
					req.session = null;
					sendMessage('Sorry. Something blew up. Please start over.');
				}

			});
		}

	}

	// Helpers
	function sendMessage(message) {

		var resp = new twilio.TwimlResponse();
		resp.message(message);
		res.type('text/xml');
		res.send(resp.toString());

	}

	function makeImage() {

		// Canvas
		var canvas = new Canvas(546, 596);
		var ctx = canvas.getContext('2d');

		// T-shirt image template
		var Image = Canvas.Image;
		var img = new Image();

		img.onload = function(){

			ctx.drawImage(img,0,0);

			// T-shirt text
			var message = req.session.message;
			ctx.font = '30px Impact';
			var te = ctx.measureText(message);
			ctx.fillStyle = '#ffffff';
			ctx.fillText(message, 273 - 0.5 * te.width, 198);

		};

		img.src = __dirname + '/public/images/' + req.session.color + '.png';

		// Convert canvas to .png
		var imageName = req.query.From + '.png';
		var out = fs.createWriteStream(__dirname + '/public/images/' + imageName);
		var stream = canvas.pngStream();

		stream.on('data', function(chunk){

			out.write(chunk);

		});

		stream.on('end', function(){

			return;

		});

	}

	function isInt(n) {

		return typeof n === 'number' && n % 1 === 0;

	}

});

http.createServer(app).listen(app.get('port'), function(){

  console.log('Express server listening on port ' + app.get('port'));

});