var O = (function() {

  var account = s_account || '', // <== fill this in with default s_account
    instance = s || s_gi(account);

  /**
  * Description
  * @method init
  * @return
  */
  function init() {
    // if you need to do anything on init, add it here.
  }

  /**
  * Clears the tracking vars to prevent double tracking on instances when the page doesn't reload
  */
  function clearVars() {
    for (var i=0; i < 75; i++) {
      s['prop'+i]='';
      s['eVar'+i]='';
      if(i<=5)
        s['hier'+i]='';
    }
    var svarArr = ['pageName','channel','products','events','campaign','purchaseID','state','zip','server','linkName'];
    for (var i=0; i < svarArr.length ; i++) {
      s[svarArr[i]]='';
    }
  }

  /**
  * Sets values to local instance of `s`.
  * @method set
  * @param {String} key
  * @param {String} [val]
  * @return
  */
  function set(key, val) {
    if (typeof key === 'object' && typeof val === 'undefined') {
      val = key;
      for (var prop in val) {
        if (val.hasOwnProperty(prop)) {
          set(prop, val[prop]);
        }
      }
    } else {
      instance[key] = val;
    }
  }

  /**
  * Retrieves values stored on local instance of `s`.
  * @method get
  * @param {String} key
  * @return MemberExpression
  */
  function get(key) {
    return instance[key];
  }

  /**
  * Trigger for s.t();
  * @method trackPageLoad
  * @return
  */
  function trackPageLoad() {
    console.groupCollapsed('[Omniture] page loaded');
    console.log('s object: ', s);
    console.groupEnd();
    instance.t();
  }

  /**
  * Trigger for s.tl();
  * @method trackClick
  * @param el
  * @param event
  * @return
  */
  function trackClick(el, event, callback) {
    console.groupCollapsed('[Omniture] click tracked');
    if (typeof el === 'string') {
      el = $('[href="' + el + '"]').get(0);
    }
    set('referrer', window.location.href);

    if (!!callback) {
      instance.tl(el, 'o', event, null, callback);
    } else {
      instance.tl(el, 'o', event);
    }

    console.log('Element: ', el);
    console.log('Event/LinkName: ', event);
    console.log('External link: ', utils.isExternalLink($(el).attr('href')));
    console.log('s_objectID: ', data('s_objectID'));
    console.log(s);
    console.groupEnd();
  }

  /**
  * Overrides local instance with new a `s` variable.
  * @method clearProps
  * @return
  */
  function clearProps() {
    instance = s_gi(account);
  }

  return {
    init: init,
    s: instance,
    set: set,
    get: get,
    trackPageLoad: trackPageLoad,
    trackClick: trackClick,
    clearProps: clearProps,
    clearVars: clearVars
  };


})();




// Usages

// Init
O.init();

// Set values
O.set('event', 'event5'); // single value
O.set({ // multi value
  'prop1': 'foo',
  'prop2': 'bar'
});

// Get values
var prop2 = O.get('prop2');

// Click tracking
$('a.foo').click(function(e) {
  omniture.set({
    eVar1: 'Expert Blogs',
    eVar3: location.pathname,
    linkTrackVars: 'events,eVar1,eVar2,eVar3,eVar8,eVar17,eVar18,eVar31,eVar32,eVar34,eVar39,eVar56,eVar60,eVar62,eVar63,eVar68,channel',
    events: 'event3',
    linkTrackEvents: 'event3'
  });
  omniture.trackClick(e.currentTarget, 'event3');
});

// Track page loaad
O.trackPageLoad();