jQuery.getJSON('/cart.js', function(cart) {
  items = cart.items;
  var results = items.filter(x => x.id === 6223106801703);
  if ((results.length == 0) && (items.length > 0)) {
    jQuery.post('/cart/add.js', {
      quantity: 1,
      id: 6223106801703
    });
    location.reload();
  }
  if (results.length > 0 ) {
    if ((results.length == 1) && (items.length == 1)) {
      // remove free gift if there are no other products in cart
      jQuery.post('/cart/update.js', {updates: {6223106801703: 0}});
    } else {
      // update free gift gift to quantity = 1, for customers adding multiple free gifts
      jQuery.post('/cart/update.js', {updates: {6223106801703: 1}});
    }
  }

});