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/**
 * The YUI module contains the components required for building the YUI seed
 * file.  This includes the script loading mechanism, a simple queue, and the
 * core utilities for the library.
 * @module yui
 * @submodule yui-base
 */

/**
 * YUI user agent detection.
 * Do not fork for a browser if it can be avoided.  Use feature detection when
 * you can.  Use the user agent as a last resort.  UA stores a version
 * number for the browser engine, 0 otherwise.  This value may or may not map
 * to the version number of the browser using the engine.  The value is
 * presented as a float so that it can easily be used for boolean evaluation
 * as well as for looking for a particular range of versions.  Because of this,
 * some of the granularity of the version info may be lost (e.g., Gecko 1.8.0.9
 * reports 1.8).
 * @class UA
 * @static
 */
Y.UA = YUI.Env.UA || function() {

    var numberify = function(s) {
            var c = 0;
            return parseFloat(s.replace(/\./g, function() {
                return (c++ == 1) ? '' : '.';
            }));
        },

        win = Y.config.win,

        nav = win && win.navigator,

        o = {

        /**
         * Internet Explorer version number or 0.  Example: 6
         * @property ie
         * @type float
         * @static
         */
        ie: 0,

        /**
         * Opera version number or 0.  Example: 9.2
         * @property opera
         * @type float
         * @static
         */
        opera: 0,

        /**
         * Gecko engine revision number.  Will evaluate to 1 if Gecko
         * is detected but the revision could not be found. Other browsers
         * will be 0.  Example: 1.8
         * <pre>
         * Firefox 1.0.0.4: 1.7.8   <-- Reports 1.7
         * Firefox 1.5.0.9: 1.8.0.9 <-- 1.8
         * Firefox 2.0.0.3: 1.8.1.3 <-- 1.81
         * Firefox 3.0   <-- 1.9
         * Firefox 3.5   <-- 1.91
         * </pre>
         * @property gecko
         * @type float
         * @static
         */
        gecko: 0,

        /**
         * AppleWebKit version.  KHTML browsers that are not WebKit browsers
         * will evaluate to 1, other browsers 0.  Example: 418.9
         * <pre>
         * Safari 1.3.2 (312.6): 312.8.1 <-- Reports 312.8 -- currently the
         *                                   latest available for Mac OSX 10.3.
         * Safari 2.0.2:         416     <-- hasOwnProperty introduced
         * Safari 2.0.4:         418     <-- preventDefault fixed
         * Safari 2.0.4 (419.3): 418.9.1 <-- One version of Safari may run
         *                                   different versions of webkit
         * Safari 2.0.4 (419.3): 419     <-- Tiger installations that have been
         *                                   updated, but not updated
         *                                   to the latest patch.
         * Webkit 212 nightly:   522+    <-- Safari 3.0 precursor (with native
         * SVG and many major issues fixed).
         * Safari 3.0.4 (523.12) 523.12  <-- First Tiger release - automatic
         * update from 2.x via the 10.4.11 OS patch.
         * Webkit nightly 1/2008:525+    <-- Supports DOMContentLoaded event.
         *                                   yahoo.com user agent hack removed.
         * </pre>
         * http://en.wikipedia.org/wiki/Safari_version_history
         * @property webkit
         * @type float
         * @static
         */
        webkit: 0,

        /**
         * Chrome will be detected as webkit, but this property will also
         * be populated with the Chrome version number
         * @property chrome
         * @type float
         * @static
         */
        chrome: 0,

        /**
         * The mobile property will be set to a string containing any relevant
         * user agent information when a modern mobile browser is detected.
         * Currently limited to Safari on the iPhone/iPod Touch, Nokia N-series
         * devices with the WebKit-based browser, and Opera Mini.
         * @property mobile
         * @type string
         * @static
         */
        mobile: null,

        /**
         * Adobe AIR version number or 0.  Only populated if webkit is detected.
         * Example: 1.0
         * @property air
         * @type float
         */
        air: 0,
        /**
         * Detects Apple iPad's OS version
         * @property ipad
         * @type float
         * @static
         */
        ipad: 0,
        /**
         * Detects Apple iPhone's OS version
         * @property iphone
         * @type float
         * @static
         */
        iphone: 0,
        /**
         * Detects Apples iPod's OS version
         * @property ipod
         * @type float
         * @static
         */
        ipod: 0,
        /**
         * General truthy check for iPad, iPhone or iPod
         * @property ios
         * @type float
         * @static
         */
        ios: null,
        /**
         * Detects Googles Android OS version
         * @property android
         * @type float
         * @static
         */
        android: 0,

        /**
         * Google Caja version number or 0.
         * @property caja
         * @type float
         */
        caja: nav && nav.cajaVersion,

        /**
         * Set to true if the page appears to be in SSL
         * @property secure
         * @type boolean
         * @static
         */
        secure: false,

        /**
         * The operating system.  Currently only detecting windows or macintosh
         * @property os
         * @type string
         * @static
         */
        os: null

    },

    ua = nav && nav.userAgent,

    loc = win && win.location,

    href = loc && loc.href,

    m;

    o.secure = href && (href.toLowerCase().indexOf('https') === 0);

    if (ua) {

        if ((/windows|win32/i).test(ua)) {
            o.os = 'windows';
        } else if ((/macintosh/i).test(ua)) {
            o.os = 'macintosh';
        } else if ((/rhino/i).test(ua)) {
            o.os = 'rhino';
        }

        // Modern KHTML browsers should qualify as Safari X-Grade
        if ((/KHTML/).test(ua)) {
            o.webkit = 1;
        }
        // Modern WebKit browsers are at least X-Grade
        m = ua.match(/AppleWebKit\/([^\s]*)/);
        if (m && m[1]) {
            o.webkit = numberify(m[1]);

            // Mobile browser check
            if (/ Mobile\//.test(ua)) {
                o.mobile = 'Apple'; // iPhone or iPod Touch

                m = ua.match(/OS ([^\s]*)/);
                if (m && m[1]) {
                    m = numberify(m[1].replace('_', '.'));
                }
                o.ipad = (navigator.platform == 'iPad') ? m : 0;
                o.ipod = (navigator.platform == 'iPod') ? m : 0;
                o.iphone = (navigator.platform == 'iPhone') ? m : 0;
                o.ios = o.ipad || o.iphone || o.ipod;
            } else {
                m = ua.match(/NokiaN[^\/]*|Android \d\.\d|webOS\/\d\.\d/);
                if (m) {
                    // Nokia N-series, Android, webOS, ex: NokiaN95
                    o.mobile = m[0];
                }
                if (/ Android/.test(ua)) {
                    o.mobile = 'Android';
                    m = ua.match(/Android ([^\s]*);/);
                    if (m && m[1]) {
                        o.android = numberify(m[1]);
                    }

                }
            }

            m = ua.match(/Chrome\/([^\s]*)/);
            if (m && m[1]) {
                o.chrome = numberify(m[1]); // Chrome
            } else {
                m = ua.match(/AdobeAIR\/([^\s]*)/);
                if (m) {
                    o.air = m[0]; // Adobe AIR 1.0 or better
                }
            }
        }

        if (!o.webkit) { // not webkit
// @todo check Opera/8.01 (J2ME/MIDP; Opera Mini/2.0.4509/1316; fi; U; ssr)
            m = ua.match(/Opera[\s\/]([^\s]*)/);
            if (m && m[1]) {
                o.opera = numberify(m[1]);
                m = ua.match(/Opera Mini[^;]*/);
                if (m) {
                    o.mobile = m[0]; // ex: Opera Mini/2.0.4509/1316
                }
            } else { // not opera or webkit
                m = ua.match(/MSIE\s([^;]*)/);
                if (m && m[1]) {
                    o.ie = numberify(m[1]);
                } else { // not opera, webkit, or ie
                    m = ua.match(/Gecko\/([^\s]*)/);
                    if (m) {
                        o.gecko = 1; // Gecko detected, look for revision
                        m = ua.match(/rv:([^\s\)]*)/);
                        if (m && m[1]) {
                            o.gecko = numberify(m[1]);
                        }
                    }
                }
            }
        }
    }

    YUI.Env.UA = o;

    return o;
}();

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