/**
* 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);