/**
 * @author Bruno Bornsztein <bruno@missingmethod.com>
 * @copyright 2007 Curbly LLC
 * @package Glider
 * @license MIT
 * @url http://www.missingmethod.com/projects/glider/
 * @version 0.0.4
 * @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.retroceder = false;
        this.avanzar = false;
        this.scrolling  = false;
        this.wrapper    = $(wrapper);
        this.scroller   = this.wrapper.down('div.scroller');
        this.sections   = this.wrapper.getElementsBySelector('div.section');
        this.options    = Object.extend({
            controlsEvent:'click', 
            duration: 1.0, 
            frequency: 5
        }, options || {});

        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:0
        });
        
        }// initialSection should be the id of the section you want to show up on load
        if(this.options.autoGlide) this.start();
    },
	
    addObservers: function() {
        this.controls = this.wrapper.getElementsBySelector('.controls a');
        this.controls.invoke('observe', this.options.controlsEvent, this.events.click);
    },	

    click: function(event) {
        this.stop();
        var element = Event.findElement(event, 'a');
        if (this.scrolling) this.scrolling.cancel();
    
        moveTo = this.wrapper.down('#'+element.href.split("#")[1])
        this.moveTo(moveTo, this.scroller, {
            duration:this.options.duration
        });     
        Event.stop(event);

        this.controls.each(function(control){
            if (control == element) {
                control.addClassName("active")
            }else{
                control.removeClassName("active")
            }			
        });
    },

    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(){
        var nextIndex;
        var currentIndex;
         
       if(this.options.direccion!="ninguna"){
           
        if (this.current){
                currentIndex = this.current._index;
            if(!this.retroceder){
                if(this.sections.length-1== currentIndex){
                    this.retroceder = true;
                    nextIndex = currentIndex - 1;
                }else{
                    nextIndex = currentIndex +1;
                }
            }else if(this.retroceder){
                if(0 == currentIndex){
                    this.retroceder = false;
                    nextIndex = currentIndex + 1;
                }else{
                    nextIndex = currentIndex - 1;
                }
            }
        }else{
            nextIndex=1;
        }
        
       }else{
            if (this.current) {
                currentIndex = this.current._index;
                nextIndex = (this.sections.length - 1 == currentIndex) ? 0 : currentIndex + 1;      
            } else {nextIndex = 1;}
        }
        
   
        this.moveTo(this.sections[nextIndex], this.scroller, { 
            duration: this.options.duration
        });
    },
	
    previous: function(){
         var currentIndex;
         var prevIndex;
        if(this.options.direccion!="ninguna"){
        if (this.current){
            
            currentIndex = this.current._index;
            //alert(currentIndex);
            if(!this.avanzar){
                if(0==currentIndex){
                    this.avanzar= true;
                    prevIndex= currentIndex +1;
                }else{
                    prevIndex= currentIndex -1; 
                }
            }else if(this.avanzar){
                if(this.sections.length-1 == currentIndex){
                    this.avanzar=false;
                    prevIndex= currentIndex -1;
                }else{
                    prevIndex= currentIndex +1; 
                }
            }
        }else{
            prevIndex= this.sections.length-1;
        }
        }else{
             if (this.current) {
                currentIndex = this.current._index;
                prevIndex = (currentIndex == 0) ? this.sections.length - 1 : currentIndex - 1;
    } else {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.options.direccion == 1)
                this.next();
            else		
                this.previous();
        }
        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;
            if(this.option.direccion == 1)
                this.element.appendChild(this.element.firstChild);
            else
                this.element.appendChild(this.element.lastChild);
        }
   
        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;
    }
});