/**
 * @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 || {});
		
		
	    //get the section and give it an index #
	    this.sections.each( function(section, index) {							
		section._index = index;		
	    }); //end init function

	    //assign the events and bind them to the scroller
	    this.events = {
	        //click: this.click.bind(this),
	      mouseover: this.mouseover.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.start();
	},

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

	mouseout: function(event) {	
		var element = Event.findElement(event, 'a');
    	        this.start();
		Event.stop(event);
	},
	
	mouseover: function(event) {
		this.stop();
		var element = Event.findElement(event, 'a');
		if (this.scrolling) this.scrolling.cancel();
		this.moveTo(element.name, this.scroller, { duration:this.options.duration });     
    	        Event.stop(event);
  	},


/*---------------------------------------------------------------
	    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();
	  },
	
  addObservers: function() {
		this.controls = this.wrapper.getElementsBySelector('.controls a');
		this.controls.invoke('observe', this.options.controlsEvent, this.events.click);
	},	
----------------------------------------------------------------*/

	styleButton: function(currentName) {		
		//set all names to 'off' style
		for (var i = 0; i<this.controls.length; i++){
			//console.log(this.controls[i].id);
			$(this.controls[i].id).removeClassName('active');		
		};
		$('control_'+currentName).addClassName('active');		
	},


	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 = $(element);
		this.styleButton(this.current.readAttribute('id'));
		Position.prepare();
		var containerOffset = Position.cumulativeOffset(container),
		elementOffset = Position.cumulativeOffset($(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;
		this.moveTo(this.sections[nextIndex], this.scroller, {duration: this.options.duration});
	},

	
	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*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;
  }
});