// 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)

    //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
  });

  /**
   * 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:3 // scroll 3 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
  });
});