/**

 * @author Ryan Johnson <ryan@livepipe.net>

 * @copyright 2007 LivePipe LLC

 * @package Control.Tabs

 * @license MIT

 * @url http://livepipe.net/projects/control_tabs/

 * @version 2.1.1

 */



if(typeof(Control) == 'undefined')

	var Control = {};

Control.Tabs = Class.create();

Object.extend(Control.Tabs,{

	instances: [],

	findByTabId: function(id){

		return Control.Tabs.instances.find(function(tab){

			return tab.links.find(function(link){

				return link.key == id;

			});

		});

	}

});

Object.extend(Control.Tabs.prototype,{

	initialize: function(tab_list_container,options){

		this.activeContainer = false;

		this.activeLink = false;

		this.containers = $H({});

		this.links = [];

		Control.Tabs.instances.push(this);

		this.options = {

			beforeChange: Prototype.emptyFunction,

			afterChange: Prototype.emptyFunction,

			hover: false,

			linkSelector: 'li a',

			setClassOnContainer: false,

			activeClassName: 'active',

			defaultTab: 'first',

			autoLinkExternal: true,

			targetRegExp: /#(.+)$/,

			showFunction: Element.show,

			hideFunction: Element.hide

		};

		Object.extend(this.options,options || {});

		(typeof(this.options.linkSelector == 'string')

			? $(tab_list_container).getElementsBySelector(this.options.linkSelector)

			: this.options.linkSelector($(tab_list_container))

		).findAll(function(link){

			return (/^#/).exec(link.href.replace(window.location.href.split('#')[0],''));

		}).each(function(link){

			this.addTab(link);

		}.bind(this));

		this.containers.values().each(this.options.hideFunction);

		if(this.options.defaultTab == 'first')

			this.setActiveTab(this.links.first());

		else if(this.options.defaultTab == 'last')

			this.setActiveTab(this.links.last());

		else

			this.setActiveTab(this.options.defaultTab);

		var targets = this.options.targetRegExp.exec(window.location);

		if(targets && targets[1]){

			targets[1].split(',').each(function(target){

				this.links.each(function(target,link){

					if(link.key == target){

						this.setActiveTab(link);

						throw $break;

					}

				}.bind(this,target));

			}.bind(this));

		}

		if(this.options.autoLinkExternal){

			$A(document.getElementsByTagName('a')).each(function(a){

				if(!this.links.include(a)){

					var clean_href = a.href.replace(window.location.href.split('#')[0],'');

					if(clean_href.substring(0,1) == '#'){

						if(this.containers.keys().include(clean_href.substring(1))){

							$(a).observe('click',function(event,clean_href){

								this.setActiveTab(clean_href.substring(1));

							}.bindAsEventListener(this,clean_href));

						}

					}

				}

			}.bind(this));

		}

	},

	addTab: function(link){

		this.links.push(link);

		link.key = link.getAttribute('href').replace(window.location.href.split('#')[0],'').split('/').last().replace(/#/,'');

		this.containers[link.key] = $(link.key);

		link[this.options.hover ? 'onmouseover' : 'onclick'] = function(link){

			if(window.event)

				Event.stop(window.event);

			this.setActiveTab(link);

			return false;

		}.bind(this,link);

	},

	setActiveTab: function(link){

		if(!link)

			return;

		if(typeof(link) == 'string'){

			this.links.each(function(_link){

				if(_link.key == link){

					this.setActiveTab(_link);

					throw $break;

				}

			}.bind(this));

		}else{

			this.notify('beforeChange',this.activeContainer);

			if(this.activeContainer)

				this.options.hideFunction(this.activeContainer);

			this.links.each(function(item){

				(this.options.setClassOnContainer ? $(item.parentNode) : item).removeClassName(this.options.activeClassName);

			}.bind(this));

			(this.options.setClassOnContainer ? $(link.parentNode) : link).addClassName(this.options.activeClassName);

			this.activeContainer = this.containers[link.key];

			this.activeLink = link;

			this.options.showFunction(this.containers[link.key]);

			this.notify('afterChange',this.containers[link.key]);

		}

	},

	next: function(){

		this.links.each(function(link,i){

			if(this.activeLink == link && this.links[i + 1]){

				this.setActiveTab(this.links[i + 1]);

				throw $break;

			}

		}.bind(this));

		return false;

	},

	previous: function(){

		this.links.each(function(link,i){

			if(this.activeLink == link && this.links[i - 1]){

				this.setActiveTab(this.links[i - 1]);

				throw $break;

			}

		}.bind(this));

		return false;

	},

	first: function(){

		this.setActiveTab(this.links.first());

		return false;

	},

	last: function(){

		this.setActiveTab(this.links.last());

		return false;

	},

	notify: function(event_name){

		try{

			if(this.options[event_name])

				return [this.options[event_name].apply(this.options[event_name],$A(arguments).slice(1))];

		}catch(e){

			if(e != $break)

				throw e;

			else

				return false;

		}

	}

});

if(typeof(Object.Event) != 'undefined')

	Object.Event.extend(Control.Tabs);