/**
 * Packery Item Element
**/

( function( window ) {

'use strict';

// -------------------------- Item -------------------------- //

function itemDefinition( Outlayer ) {

// sub-class Outlayer Item
function Item() {
  Outlayer.Item.apply( this, arguments );
}

Item.prototype = new Outlayer.Item();

Item.prototype._create = function() {
  // assign id, used for original-order sorting
  this.id = this.layout.itemGUID++;
  Outlayer.Item.prototype._create.call( this );
  this.sortData = {};
};

Item.prototype.updateSortData = function() {
  // default sorters
  this.sortData.id = this.id;
  // for backward compatibility
  this.sortData['original-order'] = this.id;
  this.sortData.random = Math.random();
  // go thru getSortData obj and apply the sorters
  var getSortData = this.layout.options.getSortData;
  for ( var key in getSortData ) {
    var sorter = getSortData[ key ];
    this.sortData[ key ] = sorter( this.element, this );
  }
};

return Item;

}

// -------------------------- transport -------------------------- //

if ( typeof define === 'function' && define.amd ) {
  // AMD
  define( [
      'outlayer/outlayer'
    ],
    itemDefinition );
} else {
  // browser global
  window.Isotope = window.Isotope || {};
  window.Isotope.Item = itemDefinition(
    window.Outlayer
  );
}

})( window );