/*
 * Copyright (C) 2006-2009 Corllete ltd (clabteam.com), License - http://www.free-source.net/licenses/design.txt)
 * Download and update at http://www.free-source.net/
 * $Id: accordion.js 371 2009-08-15 13:00:38Z sonice $
 *
 * Theme GG - JS Accordion
*/  


/* Simple Accordion Script 
 * Requires Prototype and Script.aculo.us Libraries
 * By: Brian Crescimanno <brian.crescimanno@gmail.com>
 * http://briancrescimanno.com
 * This work is licensed under the Creative Commons Attribution-Share Alike 3.0
 * http://creativecommons.org/licenses/by-sa/3.0/us/
 */

if (typeof Effect == 'undefined')
  throw("You must have the script.aculo.us library to use this accordion");

var Accordion = Class.create({

    initialize: function(id, defaultExpandedCount, options) {
        //if(!$(id)) throw("Attempted to initalize accordion with id: "+ id + " which was not found.");
        if(!$(id)) return;
        this.accordion = $(id);
        this.options = {
            toggleClass: "accordion-toggle",
            toggleActive: "accordion-toggle-active",
            contentClass: "accordion-content"
        }
		Object.extend(this.options, options || {});
		
		this.items	= $$('div.'+this.options.toggleClass);
        this.contents = $$('div.'+this.options.contentClass);
		
        this.isAnimating = false;
        this.maxHeight = 0;
        this.current = defaultExpandedCount ? this.contents[defaultExpandedCount-1] : this.contents[0];
        this.toExpand = null;

        this.checkMaxHeight();
        this.initialHide();
        this.attachInitialMaxHeight();

		this.items.each(function(item,i){ 
								 
			Event.observe(item, 'click', function(event) {
    			this.expand(i);
			}.bind(this));
								  
		}.bind(this));
   
   },
	
    expand: function(el) {
		if (!this.isAnimating){
			this.toExpand = this.contents[el] ;
			if(this.current != this.toExpand){
				this.toExpand.show();
				this.animate();
			}
		}
    },

    checkMaxHeight: function() {
        for(var i=0; i<this.contents.length; i++) {
            if(this.contents[i].getHeight() > this.maxHeight) {
                this.maxHeight = this.contents[i].getHeight();
            }
        }
    },

    attachInitialMaxHeight: function() {
		this.current.previous('div.'+this.options.toggleClass).addClassName(this.options.toggleActive);
        if(this.current.getHeight() != this.maxHeight) this.current.setStyle({height: this.maxHeight+"px"});
    },

    initialHide: function(){
        for(var i=0; i<this.contents.length; i++){
            if(this.contents[i] != this.current) {
                //this.contents[i].hide();
                this.contents[i].setStyle({height: 0});
            }
        }
    },

    animate: function() {
        var effects = new Array();
        var options = {
            sync: true,
            scaleFrom: 0,
            scaleContent: false,
            transition: Effect.Transitions.sinoidal,
            scaleMode: {
                originalHeight: this.maxHeight,
                originalWidth: this.accordion.getWidth()
            },
            scaleX: false,
            scaleY: true
        };

        effects.push(new Effect.Scale(this.toExpand, 100, options));

        options = {
            sync: true,
            scaleContent: false,
            transition: Effect.Transitions.sinoidal,
            scaleX: false,
            scaleY: true
        };

        effects.push(new Effect.Scale(this.current, 0, options));

        var myDuration = 0.4;

        new Effect.Parallel(effects, {
            duration: myDuration,
            fps: 35,
            queue: {
                position: 'end',
                scope: 'accordion'
            },
            beforeStart: function() {
                this.isAnimating = true;
                this.current.previous('div.'+this.options.toggleClass).removeClassName(this.options.toggleActive);
                this.toExpand.previous('div.'+this.options.toggleClass).addClassName(this.options.toggleActive);
            }.bind(this),
            afterFinish: function() {
                //this.current.hide();
                this.toExpand.setStyle({ height: this.maxHeight+"px" });
                this.current = this.toExpand;
                this.isAnimating = false;
            }.bind(this)
        });
    }

});