/**
 * ### Changed plugin
 *
 * This plugin adds more information to the `changed.jstree` event. The new data is contained in the `changed` event data property, and contains a lists of `selected` and `deselected` nodes.
 */
/*globals jQuery, define, exports, require, document */
(function (factory) {
	"use strict";
	if (typeof define === 'function' && define.amd) {
		define('jstree.changed', ['jquery','./jstree.js'], factory);
	}
	else if(typeof exports === 'object') {
		factory(require('jquery'), require('./jstree.js'));
	}
	else {
		factory(jQuery, jQuery.jstree);
	}
}(function ($, jstree, undefined) {
	"use strict";

	if($.jstree.plugins.changed) { return; }

	$.jstree.plugins.changed = function (options, parent) {
		var last = [];
		this.trigger = function (ev, data) {
			var i, j;
			if(!data) {
				data = {};
			}
			if(ev.replace('.jstree','') === 'changed') {
				data.changed = { selected : [], deselected : [] };
				var tmp = {};
				for(i = 0, j = last.length; i < j; i++) {
					tmp[last[i]] = 1;
				}
				for(i = 0, j = data.selected.length; i < j; i++) {
					if(!tmp[data.selected[i]]) {
						data.changed.selected.push(data.selected[i]);
					}
					else {
						tmp[data.selected[i]] = 2;
					}
				}
				for(i = 0, j = last.length; i < j; i++) {
					if(tmp[last[i]] === 1) {
						data.changed.deselected.push(last[i]);
					}
				}
				last = data.selected.slice();
			}
			/**
			 * triggered when selection changes (the "changed" plugin enhances the original event with more data)
			 * @event
			 * @name changed.jstree
			 * @param {Object} node
			 * @param {Object} action the action that caused the selection to change
			 * @param {Array} selected the current selection
			 * @param {Object} changed an object containing two properties `selected` and `deselected` - both arrays of node IDs, which were selected or deselected since the last changed event
			 * @param {Object} event the event (if any) that triggered this changed event
			 * @plugin changed
			 */
			parent.trigger.call(this, ev, data);
		};
		this.refresh = function (skip_loading, forget_state) {
			last = [];
			return parent.refresh.apply(this, arguments);
		};
	};
}));