// jQuery Menu Tree Plugin
//
// Version 1.0
//
// Usage: $('.menuTree').menuTree( options, callback )
//
// Options:  
//           menuEvent                      - event to trigger expand/collapse; default = click
//           expandSpeed                    - default = 500 (ms); use -1 for no animation
//           collapseSpeed                  - default = 500 (ms); use -1 for no animation
//           expandEasing                   - easing function to use on expand (optional)
//           collapseEasing                 - easing function to use on collapse (optional)
//           multiOpenedSubMenu             - whether or not to limit to one opened menu at a time; default = false;
//           parentMenuTriggerCallback      - whether or not parent menu triggers callback; default = false;
//           expandedNode                   - default node to expand (optional)
//
// Callback:
//           a callback function triggered with <a> 'rel' parameter.
//
// History:
//
// 1.0 - first release (28 May 2009)
//
if (jQuery) (function($) {

		$.extend($.fn, {
				menuTree: function(o, callback) {
						// Default parameters
						if (!o) var o = {};
						o.data = this.html();
						if (o.menuEvent == undefined) o.menuEvent = 'click';
						if (o.expandSpeed == undefined) o.expandSpeed = 500;
						if (o.collapseSpeed == undefined) o.collapseSpeed = 500;
						if (o.expandEasing == undefined) o.expandEasing = null;
						if (o.collapseEasing == undefined) o.collapseEasing = null;
						if (o.multiOpenedSubMenu == undefined) o.multiOpenedSubMenu = false;
						if (o.parentMenuTriggerCallback == undefined) o.parentMenuTriggerCallback = false;
						if (o.expandedNode == undefined) o.expandedNode = null;

						$(this).each(function() {

								function bindTree(t) {

										var liClickedSelector = callback != undefined ? 'LI > A' : 'LI.parent > A';
										
										$(t).find(liClickedSelector).bind(o.menuEvent, function() {
												currentItem = $(this);
												if ($(this).parent().hasClass('parent')) {
														if ($(this).parent().hasClass('expanded')) {
																// Collapse
																$(this).parent().find('UL').slideUp({ duration: o.collapseSpeed, easing: o.collapseEasing });
																$(this).parent().removeClass('expanded').addClass('collapsed');

														} else {
																// Expand
																if (!o.multiOpenedSubMenu) {
																		$(this).parent().parent().find('UL').slideUp({ duration: o.collapseSpeed, easing: o.collapseEasing });
																		$(this).parent().parent().find('LI.parent').removeClass('expanded').addClass('collapsed');
																}
																$($(this).parent().find("UL")[0]).slideDown({ duration: o.expandSpeed, easing: o.expandEasing });
																$(this).parent().removeClass('collapsed').addClass('expanded');
																$(this).parent().find('LI.parent').removeClass('expanded').addClass('collapsed');

																if (o.parentMenuTriggerCallback)
																		callback($(this).attr('rel'));
														}

												} else {
														callback($(this).attr('rel'));
												}
												return false;
										});

										// Prevent A from triggering the # on non-click events
										if (o.menuEvent.toLowerCase != 'click') $(t).find(liClickedSelector).bind('click', function() { return false; });
								}

								// initialization
								$($(this)).find(":first").show();
								bindTree($(this));

								// Expend default node
								if (o.expandedNode) {

										var elementToExpend = $($(this)).find("a[rel=" + o.expandedNode + "]").parent().parent();

										// Collect all UL items that need to be extended
										var ulMenuElements = new Array();
										var i = 0;
										while (elementToExpend && elementToExpend.find('DIV').length == 0) {

												if (elementToExpend[0].tagName == "UL") {
														ulMenuElements[i] = elementToExpend;
														i++;
												}
												elementToExpend = elementToExpend.parent();
										}
										ulMenuElements = ulMenuElements.reverse()

										// Extend all collected item (recursive)
										var i = 0;
										var openMenu = function() {

												i++; // skip first ul(root)
												if (i >= ulMenuElements.length) return;

												ulMenuElements[i].removeClass('collapsed').addClass('expanded');
												ulMenuElements[i].slideDown({ duration: o.expandSpeed, easing: o.expandEasing, complete: openMenu });

										}
										openMenu(ulMenuElements);
								}
						});
				}
		});

})(jQuery);