Glider = Class.create();
Object.extend( Object.extend(Glider.prototype, Abstract.prototype), {
  initialize: function(wrapper, options){
	    this.scrolling  = false;
	    this.wrapper    = $(wrapper);
	    this.scroller   =  $('list');
		this.direction	= 'right';

	    this.sections   = this.wrapper.getElementsBySelector('div.section');
	    this.options    = Object.extend({ duration: 1.0, frequency: 3 }, options || {});

	    this.sections.each( function(section, index) {
	      section._index = index;
	    });    

	    this.events = {
	      click: this.click.bind(this),
		  moveLeft: this.moveLeft.bind(this),
		  moveRight: this.moveRight.bind(this),
		  mouseout: this.mouseout.bind(this)
	    };
	
	    this.addObservers();
		if(this.options.initialSection) this.moveTo(this.options.initialSection, this.scroller, { duration:this.options.duration });  // initialSection should be the id of the section you want to show up on load
		if(this.options.autoGlide) this.moveTo(this.sections[8], this.scroller, { duration: 8 });
		
  },
  addObservers: function() {
    var controls = this.wrapper.getElementsBySelector('div.controls a');
    controls.invoke('observe', 'click', this.events.click);
	if(this.options.leftButton){
		$(this.options.leftButton).observe('mouseover', this.events.moveLeft);
		$(this.options.leftButton).observe('mouseout', this.events.mouseout);
	}
	if(this.options.rightButton){
		$(this.options.rightButton).observe('mouseover', this.events.moveRight);
		$(this.options.rightButton).observe('mouseout', this.events.mouseout);
	}
	this.scroller.observe('mouseover', this.events.mouseout);

  },	
  click: function(event) {
	this.stop();
    var element = Event.findElement(event, 'a');
    if (this.scrolling) this.scrolling.cancel();
    
    this.moveTo(element.href.split("#")[1], this.scroller, { duration:this.options.duration });     
    Event.stop(event);
  },
  moveLeft: function(event) {
    if (this.scrolling) this.scrolling.cancel();
	
	elementOffset = Position.realOffset($(this.sections[0]));
	var duration = elementOffset[0] / 150;
	this.moveTo(this.sections[0], this.scroller, { duration: duration });
    Event.stop(event);
  },
  moveRight: function(event) {
    if (this.scrolling) this.scrolling.cancel();
	
	elementOffset = Position.realOffset($(this.sections[0]));
	var duration = (672 - elementOffset[0]) / 150;	
	this.moveTo(this.sections[8], this.scroller, { duration: duration });
	Event.stop(event);
  },
  mouseout: function(event) {
    if (this.scrolling) this.scrolling.cancel();
	Event.stop(event);
  },
  moveTo: function(element, container, options){
		this.current = $(element);
		
		Position.prepare();
	    var containerOffset = Position.cumulativeOffset(container);
	    elementOffset = Position.cumulativeOffset($(element));
		
		this.scrolling = new Effect.SmoothScroll(container, {duration:options.duration, x:(elementOffset[0]-containerOffset[0]), y:(elementOffset[1]-containerOffset[1])});
		return false;
  },
  next: function(){
	this.direction = 'right';
    if (this.current) {
      var currentIndex = this.current._index;
      var nextIndex = (this.sections.length - 1 == currentIndex) ? 0 : currentIndex + 1;      
    } else var nextIndex = 1;

    this.moveTo(this.sections[nextIndex], this.scroller, { 
		duration: this.options.duration
    });
  },
  previous: function(){
	this.direction = 'left';
    if (this.current) {
      var currentIndex = this.current._index;
      var prevIndex = (currentIndex == 0) ? this.sections.length - 1 : 
       currentIndex - 1;
    } else var prevIndex = this.sections.length - 1;
    
    this.moveTo(this.sections[prevIndex], this.scroller, { duration: this.options.duration });
  },
  stop: function(){
	clearTimeout(this.timer);
  },	
  start: function(){
	this.periodicallyUpdate();
  },
  periodicallyUpdate: function(){ 
	if (this.timer != null) {
		clearTimeout(this.timer);
		if(this.direction=='left')this.previous();
		else this.next();
	}
	this.timer = setTimeout(this.periodicallyUpdate.bind(this), this.options.frequency*1000);
  }
});

Effect.SmoothScroll = Class.create();
Object.extend(Object.extend(Effect.SmoothScroll.prototype, Effect.Base.prototype), {
  initialize: function(element) {
    this.element = $(element);
    var options = Object.extend({
      x:    0,
      y:    0,
      mode: 'absolute'
    } , arguments[1] || {}  );
    this.start(options);
  },
  setup: function() {
    if (this.options.continuous && !this.element._ext ) {
      this.element.cleanWhitespace();
      this.element._ext=true;
      this.element.appendChild(this.element.firstChild);
    }
   
    this.originalLeft=this.element.scrollLeft;
    this.originalTop=this.element.scrollTop;
   
    if(this.options.mode == 'absolute') {
      this.options.x -= this.originalLeft;
      this.options.y -= this.originalTop;
    } 
  },
  update: function(position) {   
    this.element.scrollLeft = this.options.x * position + this.originalLeft;
    this.element.scrollTop  = this.options.y * position + this.originalTop;
  }
});