/**
 * @author Bruno Bornsztein <bruno@missingmethod.com>
 * @copyright 2007 Curbly LLC
 * @package Glider
 * @license MIT
 * @url http://www.missingmethod.com/projects/glider/
 * @version 0.0.3
 * @dependencies prototype.js 1.5.1+, effects.js
 */

/*  Thanks to Andrew Dupont for refactoring help and code cleanup - http://andrewdupont.net/  */

Glider = Class.create();
Object.extend(Object.extend(Glider.prototype, Abstract.prototype), {
	initialize: function(wrapper, options){
	    this.scrolling  = false;
	    this.wrapper    = $(wrapper);
	    this.scroller   = this.wrapper.down('div.scroller');
	    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)
	    };
		
		
		//Prüft ob der Last Parameter in der URL gesetzt ist
		if(location.search.match('&last=1'))
		{
			this.currentIndex = this.sections.length - 1;
		}

	    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.start();
	  },
	
  addObservers: function() {
    var controls = this.wrapper.getElementsBySelector('div.controls a');
    controls.invoke('observe', 'click', this.events.click);
  },	

  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);
  },

	moveTo: function(element, container, options){
		
if (this.current)
{
	this.current.removeClassName('current_slide');	
}
		this.current = $(element);
		this.current.addClassName('current_slide');
		
		
		this.highlight('link_' + this.current.id);

		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(){
    if (this.current) {
      var currentIndex = this.current._index;
      var nextIndex = (this.sections.length - 1 == currentIndex) ? 0 : currentIndex + 1;      
    } else var nextIndex = 1;
	
	if(nextIndex!=0)
	{
	    this.moveTo(this.sections[nextIndex], this.scroller, { 
	      duration: this.options.duration
	    });		
	}
	else
	{
		if(typeof next_page != "undefined")
			location.href='/index.php?id='+next_page;
		else
			location.href='/index.php?id=28';
	}


  },
  
  scrollTo: function(element) {
	  
	  
	this.moveTo(element, this.scroller, { 
		      duration: this.options.duration
		    });	  	
  },
  
  highlight: function(element) {

	controls = document.getElementsByClassName("control_item");
	controls.each(function(e) {
		e.className = 'control_item';
	});	
	
  	if($(element))
	{
		$(element).className = 'current control_item';
	}
	else
	{
		var currentId = element.replace('link_section','');
		controls.reverse();
		var foundMe = false;
		var result = 0;
		
		//Suche nach vorherigem Navigationseintrag
		var sectionList = this.sections.clone();
		sectionList.reverse().each(function(e) {
			var sectionId = e.id.replace('section','');
			
			if(sectionId == currentId)
				foundMe = true;
				
			if(foundMe)
			{
				controls.each(function(f) {
					var linkId = f.id.replace('link_section','');
					if(sectionId == linkId && result==0)
						result = linkId;
				});				
			}
		});
		if(result)
		{
			$('link_section'+result).className = 'current control_item';			
		}
	}
  },
  
  reposition: function(){
    if (this.currentIndex)
      var thisIndex = this.currentIndex;      
    else
	  var thisIndex = 0;
	
    this.moveTo(this.sections[thisIndex], this.scroller, { 
      duration: 0
    });
  },
	
  previous: function(){
    if (this.current) {
      var currentIndex = this.current._index;
      var prevIndex = (currentIndex == 0) ? -1: 
       currentIndex - 1;
    } else var prevIndex = this.sections.length - 1;
    
	if(prevIndex!=-1)
	{
	    this.moveTo(this.sections[prevIndex], this.scroller, { 
	      duration: this.options.duration
	    });		
	}
	else
	{
		if(typeof prev_page != "undefined")
			location.href='/index.php?id='+prev_page+'&last=1';
		else
			location.href='/index.php?id='+last_page+'&last=1';
	}
  },

	stop: function()
	{
		clearTimeout(this.timer);
	},
	
	start: function()
	{
		this.periodicallyUpdate();
	},
		
	periodicallyUpdate: function()
	{ 
		if (this.timer != null) {
			clearTimeout(this.timer);
			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;
  }
});