(function (ns) {

    function onGtmEventClick(e) {
        onGtmEventNodeClick(e.currentTarget)
    }

    function onGtmEventNodeClick(node) {
        var $node, data, event;
        $node = $(node);
        data = parseEventAttr($node.data('gtmEvent'));
        if (null == data || $node.data('gtmEventProcessed')) {
            return;
        }
        $node.data('gtmEventProcessed', 1);
        setTimeout(function () {
            $node.data('gtmEventProcessed', null);
        }, 100);
        event = {
            'event': 'gaTriggerEvent',
            'gaEventCategory': data.hasOwnProperty('category') ? data.category : '',
            'gaEventAction': data.hasOwnProperty('action') ? data.action : '',
            'gaEventLabel': data.hasOwnProperty('label') ? data.label : ''
        };
        if ('dataLayer' in window) {
            dataLayer.push(event);
        }
    }

    function parseEventAttr(text) {
        if (!text) {
            return;
        }
        var data, list, field, name, value, i, c;
        list = String(text).split(',');
        for (i = 0, c = list.length; i < c; ++i) {
            if (list[i] && (field = String(list[i]).split(':')).length >= 2) {
                name = field[0].replace(/^\s+|\s+$/g,'');
                value = field[1].replace(/^\s+|\s+$/g,'');
                if (!data) data = {};
                data[name] = value;
            }
        }
        return data;
    }


    ns.gtmEvent = function () {};

    ns.gtmEvent.triggerByNode = function (node) {
        onGtmEventNodeClick(node);
    };

    // data-gtm-event="category:PrintResults,action:ClickButton"
    $(function () {
        $('body').on('click.gtmEvent', '[data-gtm-event]', onGtmEventClick);
    });

})(qs.defineNS('app'));