/**************************************************************

	Script		: Accordion
	Version		: 1.1
	Authors		: Valerio Proietti, Samuel Birch
	Desc		: Menu system where when one element toggles in, the others toggle back.

**************************************************************/

var Accordion = Fx.Elements.extend({

	defaults: function(){
		return {
			onActive: Class.empty,
			onBackground: Class.empty,
			onComplete: this.onComplete,
			onStart: this.onStart,
			display: 0,
			show: false,
			height: true,
			width: false,
			opacity: true,
			fixedHeight: false,
			fixedWidth: false,
			wait: false,
			alwaysHide: false,
			container: false,
			openById: false
		};
	},

	initialize: function(togglers, elements, options){
		this.setOptions(this.defaults(), options);
		
		this.togglers = togglers || [];
		this.elements = elements || [];
		this.container = $(this.options.container);
		
		this.previous = -1;
		this.height = 0;
		if (this.options.alwaysHide) this.options.wait = true;
		if ($chk(this.options.show)){
			this.options.display = false;
			this.previous = this.options.show;
		}
		if (this.options.start){
			this.options.display = false;
			this.options.show = false;
		}
		this.effects = {};
		if (this.options.opacity) this.effects.opacity = 'fullOpacity';
		if (this.options.width) this.effects.width = this.options.fixedWidth ? 'fullWidth' : 'offsetWidth';
		if (this.options.height) this.effects.height = this.options.fixedHeight ? 'fullHeight' : 'scrollHeight';
		for (var i = 0, l = this.togglers.length; i < l; i++) this.addSection(this.togglers[i], this.elements[i]);
		this.elements.each(function(el, i){
			var id = i;
			if(this.options.openById){
				id = el.id;
			}
			if (this.options.show === id){
				this.fireEvent('onActive', [this.togglers[i], el]);
			} else {
				for (var fx in this.effects) el.setStyle(fx, 0);
			}
		}, this);
		this.parent(this.elements);
		if ($chk(this.options.display)) this.display(this.options.display);
	},

	addSection: function(toggler, element, pos){
		toggler = $(toggler);
		element = $(element);
		var test = this.togglers.contains(toggler);
		var len = this.togglers.length;
		this.togglers.include(toggler);
		this.elements.include(element);
		if (len && (!test || pos)){
			pos = $pick(pos, len - 1);
			toggler.injectBefore(this.togglers[pos]);
			element.injectAfter(toggler);
		} else if (this.container && !test){
			toggler.inject(this.container);
			element.inject(this.container);
		}
		var idx = this.togglers.indexOf(toggler);
		toggler.addEvent('click', this.display.bind(this, idx));
		if (this.options.height) element.setStyles({'padding-top': 0, 'border-top': 'none', 'padding-bottom': 0, 'border-bottom': 'none'});
		if (this.options.width) element.setStyles({'padding-left': 0, 'border-left': 'none', 'padding-right': 0, 'border-right': 'none'});
		element.fullOpacity = 1;
		if (this.options.fixedWidth) element.fullWidth = this.options.fixedWidth;
		if (this.options.fixedHeight) element.fullHeight = this.options.fixedHeight;
		element.setStyle('overflow', 'hidden');
		if (!test){
			for (var fx in this.effects) element.setStyle(fx, 0);
		}
		return this;
	},

	display: function(index){
		index = ($type(index) == 'element') ? this.elements.indexOf(index) : index;
		if ((this.timer && this.options.wait) || (index === this.previous && !this.options.alwaysHide)) return this;
		this.onStart();
		this.previous = index;
		var obj = {};
		this.elements.each(function(el, i){
			obj[i] = {};
			var hide = (i != index) || (this.options.alwaysHide && (el.offsetHeight > 0));
			this.fireEvent(hide ? 'onBackground' : 'onActive', [this.togglers[i], el]);
			for (var fx in this.effects) obj[i][fx] = hide ? 0 : el[this.effects[fx]];
		}, this);
		return this.start(obj);
	},

	showThisHideOpen: function(index){return this.display(index);},
	
	onComplete: function(){
		var el = this.elements[this.previous];
		if (el.offsetHeight > 0) {
			this.height = el.offsetHeight;
			el.setStyle('height', 'auto');
		}
	},
	
	onStart: function(){
		if(this.previous > -1){
			var el = this.elements[this.previous];
			if (el.offsetHeight > 0) {
				el.setStyle('height', this.height);
			}
		}
	}

});

Fx.Accordion = Accordion;

/*************************************************************/