renyard/validity

var _gaq = _gaq || [];

var validity = (function(validity) {
    "use strict";
    var stats = {},
        ga_elm,
        purge_timeout,
        PURGE_INTERVAL = 60;

    _gaq.push(['_setAccount', '@gaid@']);
    _gaq.push(['_trackPageview', '/validity/@version@']);

    //    Load Google Analytics Script
    stats._init = function() {
        var ga = document.createElement('script');
        ga.type = 'text/javascript';
        ga.async = true;
        ga.src = 'https://ssl.google-analytics.com/ga.js';

        var s = document.getElementsByTagName('script')[0];
        s.parentNode.insertBefore(ga, s);

        ga_elm = ga;

        if (validity.opts.option('disableAnalytics')) {
            stats.disableAnalytics();
        }
    };

    stats.disableAnalytics = function() {
        window['ga-disable-@gaid@'] = true;

        //    Clear queue periodically.
        stats._purgeTrackingQueue();
        (function clearQueue() {
            purge_timeout = window.setTimeout(function() {
                stats._purgeTrackingQueue();
                clearQueue();
            }, 60 * 60 * 1000);
        })();
    };

    stats.enableAnalytics = function() {
        window.clearTimeout(purge_timeout);
        window['ag-disable-@gaid@'] = false;
    };

    stats._purgeTrackingQueue = function() {
        //    Remove only page and events, not _setAccount from queue.
        for (var i=0; i<=_gaq; i++) {
            if (/^\_track/.match(_gaq[i][0])) {
                _gaq.splice(i, 1);
            }
        }
    };

    stats.track = function(category, action, label, value) {
        var trackingEnabled = !validity.opts.option('disableAnalytics');

        //    Don't track if analytics are disabled.
        if (trackingEnabled) {
            _gaq.push(['_trackEvent', category, action, label, value]);
        }
    };

    document.addEventListener('DOMContentLoaded', stats._init, false);

    validity.stats = stats;
    return validity;
})(validity || {});