var mootabs = new Class({
    initialize: function(element, options) {
        this.options = Object.extend({
            width:                '400px',
            height:                '285px',
            changeTransition:    Fx.Transitions.Bounce.easeOut,
            duration:            1000,
            mouseOverClass:        'active',
            activateOnLoad:        'first',
            useAjax:             false,
            ajaxUrl:             '',
            ajaxOptions:         {method:'get'},
            ajaxLoadingText:     'Loading...'
        }, options || {});
        
        this.el = $(element);
        this.elid = element;
        
        this.el.setStyles({
            height: this.options.height,
            width: this.options.width
        });
        
        this.titles = $$('#' + this.elid + ' ul li');
        this.panelHeight = this.el.getSize().size.y - (this.titles[0].getSize().size.y + 4);
        this.panels = $$('#' + this.elid + ' .mootabs_panel');

        
        this.panels.setStyle('height', this.panelHeight);
        
        this.titles.each(function(item) {
            item.addEvent('click', function(){
                    item.removeClass(this.options.mouseOverClass);
                    this.activate(item);
                }.bind(this)
            );
            
            item.addEvent('mouseover', function() {
                if(item != this.activeTitle)
                {
                    item.addClass(this.options.mouseOverClass);
                }
            }.bind(this));
            
            item.addEvent('mouseout', function() {
                if(item != this.activeTitle)
                {
                    item.removeClass(this.options.mouseOverClass);
                }
            }.bind(this));
        }.bind(this));
        
        
        if(this.options.activateOnLoad != 'none')
        {
            if(this.options.activateOnLoad == 'first')
            {
                this.activate(this.titles[0], true);
            }
            else
            {
                this.activate(this.options.activateOnLoad, true);    
            }
        }
    },
    
    activate: function(tab, skipAnim){
        if(! $defined(skipAnim))
        {
            skipAnim = false;
        }
        if($type(tab) == 'string') 
        {
            myTab = $$('#' + this.elid + ' ul li').filterByAttribute('title', '=', tab)[0];
            tab = myTab;
        }
        
        if($type(tab) == 'element')
        {
            var newTab = tab.getProperty('title');
            this.panels.removeClass('active');
            
            this.activePanel = this.panels.filterById(newTab)[0];
            
            this.activePanel.addClass('active');
            
            if(this.options.changeTransition != 'none' && skipAnim==false)
            {
                this.panels.filterById(newTab).setStyle('height', 0);
                var changeEffect = new Fx.Elements(this.panels.filterById(newTab), {duration: this.options.duration, transition: this.options.changeTransition});
                changeEffect.start({
                    '0': {
                        'height': [0, this.panelHeight]
                    }
                });
            }
            
            this.titles.removeClass('active');
            
            tab.addClass('active');
            
            this.activeTitle = tab;
            
            if(this.options.useAjax)
            {
                this._getContent();
            }
        }
    },
    
    _getContent: function(){
        this.activePanel.setHTML(this.options.ajaxLoadingText);
        var newOptions = {update: this.activePanel.getProperty('id')};
        this.options.ajaxOptions = Object.extend(this.options.ajaxOptions, newOptions || {});
        var tabRequest = new Ajax(this.options.ajaxUrl + '?tab=' + this.activeTitle.getProperty('title'), this.options.ajaxOptions);
        tabRequest.request();
    },
    
    addTab: function(title, label, content){
        //the new title
        var newTitle = new Element('li', {
            'title': title
        });
        newTitle.appendText(label);
        this.titles.include(newTitle);
        $$('#' + this.elid + ' ul').adopt(newTitle);
        newTitle.addEvent('click', function() {
            this.activate(newTitle);
        }.bind(this));
        
        newTitle.addEvent('mouseover', function() {
            if(newTitle != this.activeTitle)
            {
                newTitle.addClass(this.options.mouseOverClass);
            }
        }.bind(this));
        newTitle.addEvent('mouseout', function() {
            if(newTitle != this.activeTitle)
            {
                newTitle.removeClass(this.options.mouseOverClass);
            }
        }.bind(this));
        //the new panel
        var newPanel = new Element('div', {
            'style': {'height': this.options.panelHeight},
            'id': title,
            'class': 'mootabs_panel'
        });
        if(!this.options.useAjax)
        {
            newPanel.setHTML(content);
        }
        this.panels.include(newPanel);
        this.el.adopt(newPanel);
    },
    
    removeTab: function(title){
        if(this.activeTitle.title == title)
        {
            this.activate(this.titles[0]);
        }
        $$('#' + this.elid + ' ul li').filterByAttribute('title', '=', title)[0].remove();
        
        $$('#' + this.elid + ' .mootabs_panel').filterById(title)[0].remove();
    },
    
    next: function(){
        var nextTab = this.activeTitle.getNext();
        if(!nextTab) {
            nextTab = this.titles[0];
        }
        this.activate(nextTab);
    },
    
    previous: function(){
        var previousTab = this.activeTitle.getPrevious();
        if(!previousTab) {
            previousTab = this.titles[this.titles.length - 1];
        }
        this.activate(previousTab);
    }
});