// 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.
//
// I don't care what you think about the file size...
//   Be a pro: 
//	    http://www.thinkvitamin.com/features/webapps/serving-javascript-fast
//      http://rakaz.nl/item/make_your_pages_load_faster_by_combining_and_compressing_javascript_and_css_files
//

/*-----------------------------------------------------------------------------------------------*/

if (typeof Effect == 'undefined') 
	throw("accordion.js requires including script.aculo.us' effects.js library!");

/*
	I had to change the namespace for this library to nfl.ui.accordion
	due to a conflict with a function named.. you guessed it, accordion.
	this is exactly why things like this should be namespaced. the existing 
	function is used all over the site so it's easier to retrofit this library.
*/
nfl.namespace('nfl.ui.accordion');

nfl.ui.accordion = Class.create();
nfl.ui.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);
		if(typeof this.options.classNames.toggle == 'string'){
			nfl.log("accordian has a single class name");
			var accordions = $$('#'+container+' .'+this.options.classNames.toggle);
		}else{
			/* they passed in an array, add all classes */
			nfl.log("accordian has an array of class names");
			var accordions = [];
			try{
				for(i=0;i<this.options.classNames.toggle.length; i++){
					$$('#'+container+' .'+this.options.classNames.toggle[i]).each(function(ele){
						accordions[accordions.length]	= ele;
					});
				}
			}catch(e){}
		}
		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 = [];
	
		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) {
		  this.deactivate();
		} 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)
		};    
		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.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.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)
		});
	}
}