/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Ajax.org Code Editor (ACE).
 *
 * The Initial Developer of the Original Code is
 * Ajax.org B.V.
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *      Fabian Jakobs <fabian AT ajax DOT org>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

define(function(require, exports, module) {
"use strict";

var os = (navigator.platform.match(/mac|win|linux/i) || ["other"])[0].toLowerCase();
var ua = navigator.userAgent;

// Is the user using a browser that identifies itself as Windows
exports.isWin = (os == "win");

// Is the user using a browser that identifies itself as Mac OS
exports.isMac = (os == "mac");

// Is the user using a browser that identifies itself as Linux
exports.isLinux = (os == "linux");

exports.isIE = 
    navigator.appName == "Microsoft Internet Explorer"
    && parseFloat(navigator.userAgent.match(/MSIE ([0-9]+[\.0-9]+)/)[1]);
    
exports.isOldIE = exports.isIE && exports.isIE < 9;

// Is this Firefox or related?
exports.isGecko = exports.isMozilla = window.controllers && window.navigator.product === "Gecko";

// oldGecko == rev < 2.0 
exports.isOldGecko = exports.isGecko && parseInt((navigator.userAgent.match(/rv\:(\d+)/)||[])[1], 10) < 4;

// Is this Opera 
exports.isOpera = window.opera && Object.prototype.toString.call(window.opera) == "[object Opera]";

// Is the user using a browser that identifies itself as WebKit 
exports.isWebKit = parseFloat(ua.split("WebKit/")[1]) || undefined;

exports.isChrome = parseFloat(ua.split(" Chrome/")[1]) || undefined;

exports.isAIR = ua.indexOf("AdobeAIR") >= 0;

exports.isIPad = ua.indexOf("iPad") >= 0;

exports.isTouchPad = ua.indexOf("TouchPad") >= 0;

/*
 * I hate doing this, but we need some way to determine if the user is on a Mac
 * The reason is that users have different expectations of their key combinations.
 *
 * Take copy as an example, Mac people expect to use CMD or APPLE + C
 * Windows folks expect to use CTRL + C
 */
exports.OS = {
    LINUX: "LINUX",
    MAC: "MAC",
    WINDOWS: "WINDOWS"
};

/*
 * Return an exports.OS constant
 */
exports.getOS = function() {
    if (exports.isMac) {
        return exports.OS.MAC;
    } else if (exports.isLinux) {
        return exports.OS.LINUX;
    } else {
        return exports.OS.WINDOWS;
    }
};

});