/**
 * @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.controls   = $$('span.control');
            this.bg         = $('glider-bg');
            this.options    = Object.extend({ duration: 1.0, frequency: 3 }, options || {});
            this.menu       = $$('.menu-img span a');
            this.span       = $$('.menu-img span');
            this.glid       = this;
            
            
            this.selected = this.controls[0];

            this.controls[0].setStyle({
                    //background: 'url(../agency/images/btn-crossfader-hover.png)'
            });

	    this.sections.each( function(section, index) {
	      section._index = index;
	    });    
             
             
             
	    this.events = {
	      click: this.click.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.start();
	  },
	  

  updateControls: function (cur, next){
	
        
        
        id = cur.readAttribute('id');
        
      

        
        switch(id) {
            
          
          case "sez1":
            $$('.link').each(function(s) {
              s.setStyle(
                {color:'#7E5F06',
                 textShadow:'0px 0px 0px'}
              );
            });

            $('lsez2').setStyle(
                {color: '#FFF',
                textShadow: '2px 2px 2px #666'}
            );  
                
            this.bg.setStyle(
                {background: 'url(/images/barraMenu1.png)'}
            );
         
                
          break;

          case "sez2":
            $$('.link').each(function(s) {
              s.setStyle(
                {color:'#7E5F06',
                 textShadow:'0px 0px 0px'}
              );
            });

            $('lsez3').setStyle(
                {color: '#FFF',
                textShadow: '2px 2px 2px #666'}
            );  

            this.bg.setStyle(
                {background: 'url(/images/barraMenu2.png)'}
            );
            
                
          break;

          case "sez3":
           
           $$('.link').each(function(s) {
              s.setStyle(
                {color:'#7E5F06',
                 textShadow:'0px 0px 0px'}
              );
            });

            $('lsez4').setStyle(
                {color: '#FFF',
                textShadow: '2px 2px 2px #666'}
            );  
            
            this.bg.setStyle(
                {background: 'url(/images/barraMenu3.png)'}
            );
            
                
          break;

          case "sez4":
            
           $$('.link').each(function(s) {
              s.setStyle(
                {color:'#7E5F06',
                 textShadow:'0px 0px 0px'}
              );
            });

            $('lsez5').setStyle(
                {color: '#FFF',
                textShadow: '2px 2px 2px #666'}
            );  

            this.bg.setStyle(
                {background: 'url(/images/barraMenu4.png)'}
            );
               
                
          break;

          default:
             $$('.link').each(function(s) {
              s.setStyle(
                {color:'#7E5F06',
                 textShadow:'0px 0px 0px'}
              );
            });

          
            this.bg.setStyle(
                {background: 'url(/images/barraMenu.png)'}
            );
        }
        
        
	this.selected = next.up(0);
        
  },
  
   addObservers: function() {
    var controls = this.wrapper.getElementsBySelector('div.controls a');
    var xxx = this.glid;
    
    
        
       /* this.span.invoke('observe','click',function(event){
            xxx.updateControls(this,xxx.controls);
        });*/
 
    
    //controls.invoke('observe', 'click', this.events.click);
  },

  click: function(event) {
    


    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);

	this.updateControls(this.selected,element);
        
  },

  moveTo: function(element, container, options){
     // alert('moveto');
		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(){
    //alert('next:' + this.current);
    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
    });
    
    if (nextIndex==0){
        this.updateControls(this.selected,this.controls[nextIndex].firstChild);
    	this.controls[3].setStyle({
    		//background: 'url(../agency/images/btn-crossfader.png)'
    	});
    	this.controls[0].setStyle({
    		//background: 'url(../agency/images/btn-crossfader-hover.png)'
                
    	});
        this.selected=this.controls[0];
    }
    else {
   
            this.updateControls(this.selected,this.controls[nextIndex].firstChild);
        }

  },
	
  previous: function(){
    
    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);
			this.next();
		}
		this.timer = setTimeout(this.periodicallyUpdate.bind(this), this.options.frequency*1800);
	}

});

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;
  }
});