// Easing equation, borrowed from jQuery easing plugin
// http://gsgd.co.uk/sandbox/jquery/easing/
jQuery.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.demos.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 the commented ones.
    * 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' scroll on both ways
        navigation: '#navigation li a',
        duration: 700, // Length of the animation (if you scroll 2 axes and use queue, then each axis take half this time)
        force: true, // Force a scroll to the element specified by 'start' (some browsers don't reset on refreshes)
        jump:true, // If true, items become clickable (or w/e 'event' is, and when activated, the pane scrolls to them)

        //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:false,// Each click will stop any previous animations of the target. (false by default)
        //lock:true, // Ignore events if already animating (true by default)		
        //start: 0, // On which element (index) to begin ( 0 is the default, redundant in this case )		
        //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:1000, // It's the number of milliseconds to automatically go to the next
        //constant:true, // constant speed

        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',
        offset: -230, //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, was true
    });

    //Clicking on the image will redirect to the image collection page
    /*$('#slideshow').click(function() {
        alert();
    });*/

    /**
    * 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: 2000,
        force: true,
        axis: 'y',
        easing: 'linear',
        lazy: true, // NOTE: it's set to true, meaning you can add/remove/reorder items and the changes are taken into account.
        interval: 1, // 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
    });
});