//easing equation, borrowed from jQuery easing plugin
//http://gsgd.co.uk/sandbox/jquery/easing/
$.easing.easeOutQuart = function (x, t, b, c, d) {
    return -c * ((t=t/d-1)*t*t*t - 1) + b;
};

jQuery(function( $ ){
    /**
     * Most jQuery.serialScroll's settings, actually belong to jQuery.ScrollTo, check it's demo for an example of each option.
     * @see http://flesler.webs.com/jQuery.ScrollTo/
     * You can use EVERY single setting of jQuery.ScrollTo, in the settings hash you send to jQuery.serialScroll.
     */
    
    /**
     * The plugin binds 6 events to the container to allow external manipulation.
     * prev, next, goto, start, stop and notify
     * You use them like this: $(your_container).trigger('next'), $(your_container).trigger('goto', [5]) (0-based index).
     * If for some odd reason, the element already has any of these events bound, trigger it with the namespace.
     */		
    
    /**
     * IMPORTANT: this call to the plugin specifies ALL the settings (plus some of jQuery.ScrollTo)
     * This is done so you can see them. You DON'T need to specify them all.
     * A 'target' is specified, that means that #screen is the context for target, prev, next and navigation.
     */
    $('#screen').serialScroll({
        target:'#sections',
        items:'li', //selector to the items ( relative to the matched elements, '#sections' in this case )
        prev:'img.prev',//selector to the 'prev' button (absolute!, meaning it's relative to the document)
        next:'img.next',//selector to the 'next' button (absolute too)
        axis:'xy',//the default is 'y'
        queue:false,//we scroll on both axes, scroll both at the same time.
        event:'click',//on which event to react (click is the default, you probably won't need to specify it)
        stop:true,//each click will stop any previous animations of the target. (false by default)
        lock:true, //ignore events if already animating (true by default)
        duration:700,//length of the animation (if you scroll 2 axes and use queue, then each axis take half this time)
        start: 0, //on which element (index) to begin ( 0 is the default, redundant in this case )
        force:true, //force a scroll to the element specified by 'start' (some browsers don't reset on refreshes)
        cycle:true,//cycle endlessly ( constant velocity, true is the default )
        step:1, //how many items to scroll each time ( 1 is the default, no need to specify )
        jump:false, //if true, items become clickable (or w/e 'event' is, and when activated, the pane scrolls to them)
        lazy:false,//(default) if true, the plugin looks for the items on each event(allows AJAX or JS content, or reordering)
        interval:false, //it's the number of milliseconds to automatically go to the next
        navigation:'#navigation li',
        constant:true,
        onBefore:function( e, elem, $pane, $items, pos ){
            /**
             * 'this' is the triggered element 
             * e is the event object
             * elem is the element we'll be scrolling to
             * $pane is the element being scrolled
             * $items is the items collection at this moment
             * pos is the position of elem in the collection
             * if it returns false, the event will be ignored
             */
             //those arguments with a $ are jqueryfied, elem isn't.
            e.preventDefault();
            if( this.blur )
                this.blur();
        },
        onAfter:function( elem ){
            //'this' is the element being scrolled ($pane) not jqueryfied
        }
    });
    
    /**
     * No need to have only one element in view, you can use it for slideshows or similar.
     * In this case, clicking the images, scrolls to them.
     * No target in this case, so the selectors are absolute.
     */
    
    $('#slideshow').serialScroll({
        items:'li',
        prev:'#screen2 a.prev',
        next:'#screen2 a.next',
        axis:'x',
        offset:-280, //when scrolling to photo, stop 230 before reaching it (from the left)
        start:1, //as we are centering it, start at the 2nd
        duration:1200,
        force:true,
        stop:true,
        lock:false,
        cycle:false, //don't pull back once you reach the end
        easing:'easeOutQuart', //use this easing equation for a funny effect
        jump: false //click on the images to scroll to them
    });
    
    /**
     * The call below, is just to show that you are not restricted to prev/next buttons
     * In this case, the plugin will react to a custom event on the container
     * You can trigger the event from the outside.
     */
    
    var $news = $('#news-ticker');//we'll re use it a lot, so better save it to a var.
    $news.serialScroll({
        items:'div',
        duration:700,
        force:true,
        axis:'y',
        lazy:true,//NOTE: it's set to true, meaning you can add/remove/reorder items and the changes are taken into account.
        interval:5000, //yeah! I now added auto-scrolling
        step:2 //scroll 2 news each time
    });	
    
    /**
     * The following you don't need to see, is just for the "Add 2 Items" and "Shuffle"" buttons
     * These exemplify the use of the option 'lazy'.
     */
    $('#add-news').click(function(){
        var 
            $items = $news.find('div'),
            num = $items.length + 1;
            
        $items.slice(-2).clone().find('h4').each(function(i){
            $(this).text( 'News ' + (num + i) );
        }).end().appendTo($news);
    });
    $('#shuffle-news').click(function(){//don't shuffle the first, don't wanna deal with css
        var shuffled = $news.find('div').get().slice(1).sort(function(){
            return Math.round(Math.random())-0.5;//just a random number between -0.5 and 0.5
        });
        $(shuffled).appendTo($news);//add them all reordered
    });
});