/**
* jQuery.LocalScroll
* Copyright (c) 2007-2008 Ariel Flesler - aflesler(at)gmail(dot)com | http://flesler.blogspot.com
* Dual licensed under MIT and GPL.
* Date: 3/10/2008
*
* @projectDescription Animated scrolling navigation, using anchors.
* http://flesler.blogspot.com/2007/10/jquerylocalscroll-10.html
* @author Ariel Flesler
* @version 1.2.5
*
* @id jQuery.fn.localScroll
* @param {Object} settings Hash of settings, it is passed in to jQuery.ScrollTo, none is required.
* @return {jQuery} Returns the same jQuery object, for chaining.
*
* @example $('ul.links').localScroll();
*
* @example $('ul.links').localScroll({ filter:'.animated', duration:400, axis:'x' });
*
* @example $.localScroll({ target:'#pane', axis:'xy', queue:true, event:'mouseover' });
*
* Notes:
*	- The plugin requires jQuery.ScrollTo.
*	- The hash of settings, is passed to jQuery.ScrollTo, so the settings are valid for that plugin as well.
*	- jQuery.localScroll can be used if the desired links, are all over the document, it accepts the same settings.
*  - If the setting 'lazy' is set to true, then the binding will still work for later added anchors.
*  - The setting 'speed' is deprecated, use 'duration' instead.
*	- If onBefore returns false, the event is ignored.
**/
; (function($) {
	var URI = location.href.replace(/#.*/, ''); //local url without hash

	var $localScroll = $.localScroll = function(settings) {
		$('body').localScroll(settings);
	};

	//Many of these defaults, belong to jQuery.ScrollTo, check it's demo for an example of each option.
	//@see http://www.freewebs.com/flesler/jQuery.ScrollTo/
	$localScroll.defaults = {//the defaults are public and can be overriden.
		duration: 1000, //how long to animate.
		axis: 'y', //which of top and left should be modified.
		event: 'click', //on which event to react.
		stop: true//avoid queuing animations 
		/*
		lock:false,//ignore events if already animating
		lazy:false,//if true, links can be added later, and will still work.
		target:null, //what to scroll (selector or element). Keep it null if want to scroll the whole window.
		filter:null, //filter some anchors out of the matched elements.
		hash: false//if true, the hash of the selected link, will appear on the address bar.
		*/
	};

	//if the URL contains a hash, it will scroll to the pointed element
	$localScroll.hash = function(settings) {
		settings = $.extend({}, $localScroll.defaults, settings);
		settings.hash = false; //can't be true
		if (location.hash)
			setTimeout(function() { scroll(0, location, settings); }, 0); //better wrapped with a setTimeout
	};

	$.fn.localScroll = function(settings) {
		settings = $.extend({}, $localScroll.defaults, settings);

		return (settings.persistent || settings.lazy)
				? this.bind(settings.event, function(e) {//use event delegation, more links can be added later.
					var a = $([e.target, e.target.parentNode]).filter(filter)[0]; //if a valid link was clicked.
					a && scroll(e, a, settings); //do scroll.
				})
				: this.find('a')//bind concretely, to each matching link
						.filter(filter).bind(settings.event, function(e) {
							scroll(e, this, settings);
						}).end()
					.end();

		function filter() {//is this a link that points to an anchor and passes a possible filter ? href is checked to avoid a bug in FF.
			return !!this.href && !!this.hash && this.href.replace(this.hash, '') == URI && (!settings.filter || $(this).is(settings.filter));
		};
	};

	function scroll(e, link, settings) {
		var id = link.hash.slice(1),
			elem = document.getElementById(id) || document.getElementsByName(id)[0];
		if (elem) {
			e && e.preventDefault();
			var $target = $(settings.target || $.scrollTo.window()); //if none specified, then the window.

			if (settings.lock && $target.is(':animated') ||
			settings.onBefore && settings.onBefore.call(link, e, elem, $target) === false) return;

			if (settings.stop)
				$target.queue('fx', []).stop(); //remove all its animations
			$target
				.scrollTo(elem, settings)//do scroll
				.trigger('notify.serialScroll', [elem]); //notify serialScroll about this change
			if (settings.hash)
				$target.queue(function() {
					location = link.hash;
				});
		}
	};

})(jQuery);