$.fn.extend({
	// the plugin method itself
	Accordion: function(settings) {
		// setup configuration
		settings = $.extend({}, $.Accordion.defaults, {
			// define context defaults
			header: $(':first-child', this)[0].tagName // take first childs tagName as header
		}, settings);

		// calculate active if not specified, using the first header
		var container = this,
			active = settings.active
				? $(settings.active, this)
				: settings.active === false
					? $("<div>")
					: $(settings.header, this).eq(0),
			running = 0;

		container.find(settings.header)
			.not(active || "")
			.nextUntil(settings.header)
			.hide();
		active.addClass(settings.selectedClass);

		function clickHandler(event) {
			// get the click target
			var clicked = $(event.target);
			
			// due to the event delegation model, we have to check if one
			// of the parent elements is our actual header, and find that
			if ( clicked.parents(settings.header).length ) {
				while ( !clicked.is(settings.header) ) {
					clicked = clicked.parent();
				}
			}
			
			var clickedActive = clicked[0] == active[0];
			
			// if animations are still active, or the active header is the target, ignore click
			if(running || (settings.alwaysOpen && clickedActive) || !clicked.is(settings.header))
				return;

			// switch classes
			active.toggleClass(settings.selectedClass);
			if ( !clickedActive ) {
				clicked.addClass(settings.selectedClass);
			}

			// find elements to show and hide
			var toShow = clicked.nextUntil(settings.header),
				toHide = active.nextUntil(settings.header),
				data = [clicked, active, toShow, toHide];
			active = clickedActive ? $([]) : clicked;
			// count elements to animate
			running = toHide.size() + toShow.size();
			var finished = function(cancel) {
				running = cancel ? 0 : --running;
				if ( running )
					return;

				// trigger custom change event
				container.trigger("change", data);
			};
			// TODO if hideSpeed is set to zero, animations are crappy
			// workaround: use hide instead
			// solution: animate should check for speed of 0 and do something about it
			if ( settings.animated ) {
				if ( !settings.alwaysOpen && clickedActive ) {
					toShow.slideToggle(settings.showSpeed);
					finished(true);
				} else {
					toHide.filter(":hidden").each(finished).end().filter(":visible").slideUp(settings.hideSpeed, finished);
					toShow.slideDown(settings.showSpeed, finished);
				}
			} else {
				if ( !settings.alwaysOpen && clickedActive ) {
					toShow.toggle();
				} else {
					toHide.hide();
					toShow.show();
				}
				finished(true);
			}

			return false;
		};
		function activateHandlder(event, index) {
			// call clickHandler with custom event
			clickHandler({
				target: $(settings.header, this)[index]
			});
		};

		return container
			.bind(settings.event, clickHandler)
			.bind("activate", activateHandlder);
	},
	// programmatic triggering
	activate: function(index) {
		return this.trigger('activate', [index || 0]);
	}
});

$.Accordion = {};
$.extend($.Accordion, {
	defaults: {
		selectedClass: "selected",
		showSpeed: 'slow',
		hideSpeed: 'fast',
		alwaysOpen: true,
		animated: true,
		event: "click"
	},
	setDefaults: function(settings) {
		$.extend($.Accordion.defaults, settings);
	}
});