/**
 * jQuery custom event "outerClick".
 * @author David Brockman Smoliansky http://littleroom.se/
 * @license GNU Lesser General Public License: http://creativecommons.org/licenses/LGPL/2.1/
 * @version 1.0.1
 * 2009/02/24
 */

/*global jQuery */
(function ($, elements, OUTER_CLICK, LENGTH) {
	
	/**
	 * Check if the event should be fired.
	 * @param {Object} event  The click event.
	 * @private
	 */
	function check(event) {
		for (var target = event.target, i = 0, l = elements[LENGTH], el; i < l; i++) {
			el = elements[i];
			if (el !== target && !(el.contains ? el.contains(target) : el.compareDocumentPosition ? el.compareDocumentPosition(target) & 16 : true)) {
				$.event.trigger(OUTER_CLICK, event, el);
			}
		}
	}
	
	
	$.event.special[OUTER_CLICK] = {
		
		setup: function () {
			if (!elements[LENGTH]) {
				// elements list is empty: attach the listener.
				$.event.add(document, 'click', check);
			}
			if ($.inArray(this, elements) < 0) {
				elements[elements[LENGTH]] = this;
			}
		},
		
		teardown: function () {
			for (var filtered = [], i = 0, j = 0, l = elements[LENGTH], el; i < l; i++) {
				el = elements[i];
				if (el !== this) {
					filtered[j++] = el;
				}
			}
			elements[LENGTH] = 0;
			if (!elements.push.apply(elements, filtered)) {
				// elements list is empty: detach the listener.
				$.event.remove(document, 'click', check);
			}
		}
		
	};
	
	
	/**
	 * The outerClick event is fired when an element outside of the target element is clicked.
	 * Event helper outerClick: $.fn.outerClick
	 * 
	 * @param  {Function} [fn]  A function to bind to the outerClick event on each of the matched elements.
	 *                          If fn is omitted the event is instead triggered.
	 * @return {jQuery}         Returns the jQuery object.
	 */
	$.fn[OUTER_CLICK] = function (fn) {
		return fn ? this.bind(OUTER_CLICK, fn) : this.trigger(OUTER_CLICK);
	};
	
})(jQuery, [], 'outerClick', 'length');