// accordion.js v2.0
// Copyright (c) 2007 stickmanlabs
// Author: Kevin P Miller | http://www.stickmanlabs.com
// Accordion is freely distributable under the terms of an MIT-style license.
/*-----------------------------------------------------------------------------------------------*/
if (typeof Effect == 'undefined') 
	throw("accordion.js requires including script.aculo.us' effects.js library!");

var Accordion = Class.create();
Accordion.prototype = {

	//
	//  Setup the Variables
	//
	showAccordion : null,
	currentAccordion : null,
	duration : null,
	effects : [],
	animating : false,
	
	//  
	//  Initialize the accordions
	//
	initialize: function(container, options) {
	  if (!$(container)) {
	    throw(container+" doesn't exist!");
	    return false;
	  }
	  
		this.options = Object.extend({
			resizeSpeed : 8,
			classNames : {
				toggle : 'accordion_toggle',
				toggleActive : 'accordion_toggle_active',
				content : 'accordion_content'
			},
			defaultSize : {
				height : null,
				width : null
			},
			direction : 'vertical',
			onEvent : 'click'

		}, options || {});
		
		this.duration = ((11-this.options.resizeSpeed)*0.15);
		
        this.containerNode = $(container);
        this.containerID = $(container).id;

		var accordions = $$('#'+this.containerID+' .'+this.options.classNames.toggle);
//		var i;
//		accordions.each(function(accordion) {
//    		accordion.setAttribute('index', i);
//    		i++;
//    	});
    	$$('#'+this.containerID+' .accordion_toggle').each(function(item, idx){
    		item.setAttribute('index',idx);
    	});

		accordions.each(function(accordion) {
			Event.observe(accordion, this.options.onEvent, this.activate.bind(this, accordion), false);
			if (this.options.onEvent == 'click') {
			  accordion.onclick = function() {return false;};
			}
			
			if (this.options.direction == 'horizontal') {
				var options = ({width: '0px'});
			} else {
				var options = ({height: '0px'});			
			}
			Object.extend(options, {display: 'none'});		
			
			this.currentAccordion = $(accordion.next(0)).setStyle(options);			
		}.bind(this));
	},
	
	//
	//  Activate an accordion
	//
	activate : function(accordion) {
		if (this.animating) {
			return false;
		}
		
		this.effects = [];
		
		accordion = $(accordion);
		accordion.fire('accordion:onBeforeActivate');
		
		this.currentAccordion = $(accordion.next(0));
		this.currentAccordion.setStyle({
			display: 'block'
		});		
		
		this.currentAccordion.previous(0).addClassName(this.options.classNames.toggleActive);

		if (this.options.direction == 'horizontal') {
			this.scaling = ({
				scaleX: true,
				scaleY: false
			});
		} else {
			this.scaling = ({
				scaleX: false,
				scaleY: true
			});			
		}
			
		if (this.currentAccordion == this.showAccordion) {
			if ($$('#'+this.containerID+' .accordion_toggle').length == 1) {
				this.deactivate();
			}
			else {
				var nextIndex = 0;
				//last element
				if (eval(this.currentAccordion.previous(0).getAttribute('index')) == ($$('#'+this.containerID+' .accordion_toggle').length - 1)) {
					nextIndex = $$('#'+this.containerID+' .accordion_toggle').length - 2;
				}
				//other elements
				else{ 
					nextIndex = eval(this.currentAccordion.previous(0).getAttribute('index')) + 1;
				}
				this.activate($$('#'+this.containerID+' .accordion_toggle')[nextIndex])
			}
		} else {
		  this._handleAccordion();
		}
	},
	// 
	// Deactivate an active accordion
	//
	deactivate : function() {
		var options = ({
		  duration: this.duration,
			scaleContent: false,
			transition: Effect.Transitions.sinoidal,
			queue: {
				position: 'end', 
				scope: 'accordionAnimation'
			},
			scaleMode: { 
				originalHeight: this.options.defaultSize.height ? this.options.defaultSize.height : this.currentAccordion.scrollHeight,
				originalWidth: this.options.defaultSize.width ? this.options.defaultSize.width : this.currentAccordion.scrollWidth
			},
			afterFinish: function() {
				this.showAccordion.setStyle({
          			height: 'auto',
					display: 'none'
				});				
				this.showAccordion = null;
				this.animating = false;
			}.bind(this)
		});
		
		this.showAccordion.fire('accordion:onBeforeDeactivate');
				
    	Object.extend(options, this.scaling);
    	this.showAccordion.previous(0).removeClassName(this.options.classNames.toggleActive);
		
		new Effect.Scale(this.showAccordion, 0, options);
	},

  //
  // Handle the open/close actions of the accordion
  //
	_handleAccordion : function() {
		var options = ({
			sync: true,
			scaleFrom: 0,
			scaleContent: false,
			transition: Effect.Transitions.sinoidal,
			scaleMode: { 
				originalHeight: this.options.defaultSize.height ? this.options.defaultSize.height : this.currentAccordion.scrollHeight,
				originalWidth: this.options.defaultSize.width ? this.options.defaultSize.width : this.currentAccordion.scrollWidth
			}
		});
		Object.extend(options, this.scaling);

		this.currentAccordion.previous(0).fire('accordion:onBeforeExpand');			
		this.effects.push(
			new Effect.Scale(this.currentAccordion, 100, options)
		);
						
		if (this.showAccordion) {
			this.showAccordion.previous(0).removeClassName(this.options.classNames.toggleActive);
			
			options = ({
				sync: true,
				scaleContent: false,
				transition: Effect.Transitions.sinoidal
			});
			Object.extend(options, this.scaling);
			
			this.showAccordion.previous(0).fire('accordion:onBeforeCollapse');
			this.effects.push(
				new Effect.Scale(this.showAccordion, 0, options)
			);				
		}
		
    new Effect.Parallel(this.effects, {
			duration: this.duration, 
			queue: {
				position: 'end', 
				scope: 'accordionAnimation'
			},
			beforeStart: function() {
				this.animating = true;
			}.bind(this),
			afterFinish: function() {
				if (this.showAccordion) {
					this.showAccordion.setStyle({
						display: 'none'
					});				
				}

				

				$(this.currentAccordion).setStyle({
				  height: 'auto'
				});

				this.showAccordion = this.currentAccordion;
				this.animating = false;
			}.bind(this)
		});
		
		
		
	}
}