/*  Prototabs
 *  (c) 2007 James Starmer
 *
 *  Prototabs is freely distributable under the terms of an MIT-style license.
 *  For details, see the web site: http://www.jamesstarmer.com/prototabs
 *
/*--------------------------------------------------------------------------*/

var ProtoTabs = Class.create();
ProtoTabs.prototype = {

    initialize: function(element, options) {
        this.options = Object.extend({
            defaultPanel: '',
            ajaxUrls: {},
            ajaxLoadingText: 'Loading...'
        }, options || {});

        this.currentTab = '';

        this.element = $(element);
        if (this.element == null) 
            return;
        this.listElements = $A(this.element.getElementsByTagName('LI'));

        //loop over each list element
        for (i = 0; i < this.listElements.length; i++) {

            //get the tabs
            tabLI = this.listElements[i];
            var itemLinks = tabLI.getElementsByTagName('A');
            tabLI.itemId = itemLinks[0].href.split("#")[1];
            tabLI.linkedPanel = $(tabLI.itemId);
            tabLI.linkedPanel.style.clear = "both"; 	//firefox hack

            //check for the intially active tab
            if ((this.options.defaultPanel != '') && (this.options.defaultPanel == tabLI.itemId)) {
                this.openPanel(tabLI);
            } else {
                $($(tabLI).linkedPanel).hide();
            }

            // watch for clicked
            $(itemLinks[0]).observe('click', function(event) {
                element = Event.findElement(event, 'LI');
                this.openPanel(element);
                Event.stop(event); // like return false;
            } .bind(this));
        }

    },

    openPanel: function(tab) {
        tab = $(tab); // ie hack

        if (this.currentTab != '') {
            this.currentTab.linkedPanel.hide();
            this.currentTab.removeClassName('selected');
        }

        //set the currently open panel to the new panel
        this.currentTab = tab;

        tab.linkedPanel.show();
        tab.addClassName('selected');
        var url = this.options.ajaxUrls[tab.itemId];

        // if there is an ajax url defined update the panel with ajax
        if (url != undefined) {
            tab.linkedPanel.update(this.options.ajaxLoadingText);
            new Ajax.Request(url, {
                onComplete: function(transport) {
                    tab.linkedPanel.update(transport.responseText);
                }
            });
        }

    }
};