/**!
    Head JS     The only script in your <HEAD>
    Copyright   Tero Piirainen (tipiirai)
    License     MIT / http://bit.ly/mit-license
    Version     0.97a

    http://headjs.com
*/
; (function (win, undefined) {
    "use strict";

    var doc   = win.document,
        nav   = win.navigator,
        loc   = win.location,
        html  = doc.documentElement,
        klass = [],
        conf  = {
            screens: [320, 480, 640, 768, 1024, 1280, 1440, 1680, 1920],
            section: "-section",
            page   : "-page",
            head   : "head"
        };

    if (win.head_conf) {
        for (var item in win.head_conf) {
            if (win.head_conf[item] !== undefined) {
                conf[item] = win.head_conf[item];
            }
        }
    }

    function pushClass(name) {
        klass[klass.length] = name;
    }

    function removeClass(name) {
        var re = new RegExp("\\b" + name + "\\b");
        html.className = html.className.replace(re, '');
    }

    function each(arr, fn) {
        for (var i = 0, l = arr.length; i < l; i++) {
            fn.call(arr, arr[i], i);
        }
    }


    // API
    var api = win[conf.head] = function () {
        api.ready.apply(null, arguments);
    };

    api.feature = function (key, enabled, queue) {

        // internal: apply all classes
        if (!key) {
            html.className += ' ' + klass.join(' ');
            klass = [];
            return api;
        }

        if (Object.prototype.toString.call(enabled) === '[object Function]') {
            enabled = enabled.call();
        }

        pushClass((enabled ? '' : 'no-') + key);
        api[key] = !!enabled;

        // apply class to HTML element
        if (!queue) {
            removeClass('no-' + key);
            removeClass(key);
            api.feature();
        }

        return api;
    };

    // no queue here, so we can remove any eventual pre-existing no-js class
    api.feature("js", true);

    // browser type & version
    var ua = nav.userAgent.toLowerCase(),
        mobile = /mobile|midp/.test(ua);

    // useful for enabling/disabling feature (we can consider a desktop navigator to have more cpu/gpu power)        
    api.feature("mobile" , mobile , true);
    api.feature("desktop", !mobile, true);
    api.feature("touch"  , 'ontouchstart' in win, true);

    // http://www.zytrax.com/tech/web/browser_ids.htm
    // http://www.zytrax.com/tech/web/mobile_ids.html
    ua = /(chrome|firefox)[ \/]([\w.]+)/.exec(ua) || // Chrome & Firefox
         /(iphone|ipad|ipod)(?:.*version)?[ \/]([\w.]+)/.exec(ua) || // Mobile IOS
         /(android)(?:.*version)?[ \/]([\w.]+)/.exec(ua) || // Mobile Webkit
         /(webkit|opera)(?:.*version)?[ \/]([\w.]+)/.exec(ua) || // Safari & Opera
         /(msie) ([\w.]+)/.exec(ua) || [];


    var browser = ua[1],
        version = parseFloat(ua[2]),
        start   = 0,
        stop    = 0;
    
    switch (browser) {
        case 'msie':
            browser = 'ie';
            version = doc.documentMode || version;

            start = 6;
            stop  = 10;
            break;

            // Add/remove extra tests here
        case 'chrome':
            start = 8;
            stop  = 22;
            break;

        case 'firefox':
            browser = 'ff';

            start = 3;
            stop = 17;
            break;

        case 'ipod':
        case 'ipad':
        case 'iphone':
            browser = 'ios';

            start = 3;
            stop  = 6;
            break;

        case 'android':
            start = 2;
            stop  = 4;
            break;

        case 'webkit':
            browser = 'safari';

            start = 9;
            stop  = 12;
            break;

        case 'opera':
            start = 9;
            stop  = 12;
            break;
    }


    // name can be used further on for various tasks, like font-face detection in css3.js
    api.browser = {
        name   : browser,
        version: version
    };
    api.browser[browser] = true;


    // add supported, not supported classes
    var supported = ['ie'];
    //var supported = ['ie', 'chrome', 'ff', 'ios', 'android', 'safari', 'opera'];
    each(supported, function (name) {
        if (name === browser) {
            pushClass(name);
        }
        else {
            pushClass("no-" + name);
        }
    });


    for (var v = start; v <= stop; v++) {
        if (version < v) {
            pushClass("lt-" + browser + v);
        }
    }


    // IE lt9 specific
    if (browser === "ie" && version < 9) {
        // HTML5 support : you still need to add html5 css initialization styles to your site
        // See: assets/html5.css
        each("abbr|article|aside|audio|canvas|details|figcaption|figure|footer|header|hgroup|mark|meter|nav|output|progress|section|summary|time|video".split("|"), function (el) {
            doc.createElement(el);
        });
    }


    // CSS "router"
    each(loc.pathname.split("/"), function (el, i) {
        if (this.length > 2 && this[i + 1] !== undefined) {
            if (i) {
                pushClass(this.slice(1, i + 1).join("-").toLowerCase() + conf.section);
            }
        } else {
            // pageId
            var id = el || "index", index = id.indexOf(".");
            if (index > 0) {
                id = id.substring(0, index);
            }

            html.id = id.toLowerCase() + conf.page;

            // on root?
            if (!i) {
                pushClass("root" + conf.section);
            }
        }
    });

    // basic screen info
    api.screen = {
        height: win.screen.height,
        width : win.screen.width
    };

    // screen resolution: w-100, lt-480, lt-1024 ...
    function screenSize() {
        // Viewport width
        var iw = win.innerWidth || html.clientWidth,
            ow = win.outerWidth || win.screen.width;
        
        api.screen['innerWidth'] = iw;
        api.screen['outerWidth'] = ow;
        

        // START old code
        var w = win.outerWidth || html.clientWidth;

        // remove earlier widths
        html.className = html.className.replace(/ (w|lt|portrait|no-portrait|landscape|no-landscape)-\d+/g, "");

        // add new ones
        pushClass("w-" + Math.round(w / 100) * 100);

        each(conf.screens, function (width) {
            if (w <= width) {
                pushClass("lt-" + width);
            }
        });
        // END old code

        // Viewport height
        var ih = win.innerHeight || html.clientHeight,
            oh = win.outerHeight || win.screen.height;

        api.screen['innerHeight'] = ih;
        api.screen['outerHeight'] = oh;
        
        // no need for onChange event to detect this
        api.feature("portrait" , (ih > iw));
        api.feature("landscape", (ih < iw));
    }

    screenSize();

    // Throttle navigators from triggering too many resize events
    var resizeId = 0;
    function onResize() {
        win.clearTimeout(resizeId);
        resizeId = win.setTimeout(screenSize, 100);
    }

    // Manually attach, as to not overwrite existing handler
    if (win.addEventListener) {
        win.addEventListener("resize", onResize, false);

    } else {
        win.attachEvent("onresize", onResize);
    }
})(window);
