/*
 * Epirts.js
 * Free software replacement for Stripe.js implementing a subset of the
 * Stripe.js API
 *
 * @licstart  The following is the entire license notice for the
 * JavaScript code in this file.
 *
 * Copyright (C) 2015  Patrick "P. J." McDermott
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * As additional permission under GNU GPL version 3 section 7, you
 * may distribute non-source (e.g. minimized or compacted) forms of
 * this program without the copy of the GNU GPL normally required by
 * section 4, provided you include this license notice and a URL
 * through which recipients can access the Corresponding Source.
 *
 * @licend  The above is the entire license notice
 * for the JavaScript code in this file.
 */

var Stripe = Epirts = (function() {
	var pub = {};
	var _key = undefined;

	pub.card = (function() {
		var pub = {};

		pub.createToken = function(data, callback) {
		};

		pub.validateCardNumber = function(number) {
			number = (number + '').replace(/\s|-/g);
			if (number.match(/\D/)) {
				return false;
			} else if (number.length < 13 || number.length > 16) {
				/* Card number lengths:
				 *   * VISA: 13 or 16
				 *   * MasterCard: 16
				 *   * American Express: 15
				 *   * JCB: 16
				 *   * Discover: 16
				 *   * Diners Club: 14-16
				 */
				return false;
			} else if (!pub.luhnCheck(number)) {
				return false;
			}
			return true;
		};

		pub.luhnCheck = function(number) {
			var i;
			var digit;
			var sum;

			number += '';
			sum = 0;
			for (i = 0; i < number.length; ++i) {
				digit = number.charAt(number.length - 1 - i);
				digit = parseInt(digit);
				digit *= i % 2 + 1;
				if (digit > 9) {
					digit -= 9;
				}
				sum += digit;
			}
			return sum % 10 === 0;
		};

		pub.validateExpiry = function(month, year) {
		};

		pub.validateCVC = function(cvc) {
			cvc += '';
			if (cvc.match(/\D/)) {
				return false;
			} else if (cvc.length < 3 || cvc.length > 4) {
				return false;
			}
			return true;
		};

		pub.cardType = function(number) {
			var p;
			var i;

			/* Approximate IIN prefixes */
			p = {};
			for (i = 40; i <= 49; ++i) p[i] = 'Visa';
			for (i = 51; i <= 55; ++i) p[i] = 'MasterCard';
			p[34] = p[37] = 'American Express';
			p[35] = 'JCB';
			p[60] = p[62] = p[64] = p[65] = 'Discover';
			p[30] = p[36] = p[38] = p[39] = 'Diners Club';

			return p[(number + '').slice(0, 2)] || 'Unknown';
		};

		return pub;
	}());

	pub.setPublishableKey = function(key) {
		if (typeof key !== 'string') {
			throw new Error('Invalid publishable key');
		}
		if (!key.match(/^pk_[A-Za-z0-9_]+/)) {
			throw new Error('Invalid publishable key');
		}
		_key = key;
	};

	return pub;
}());