// JavaScript Document
/**
 * jQuery TOOLS plugin :: tabs.history 1.0.2
 * 
 * Copyright (c) 2009 Tero Piirainen
 * http://flowplayer.org/tools/tabs.html#history
 *
 * Dual licensed under MIT and GPL 2+ licenses
 * http://www.opensource.org/licenses
 *
 * Launch  : September 2009
 * Date: ${date}
 * Revision: ${revision} 
 */
(function($) {
    
    var t = $.tools.tabs; 
    t.plugins = t.plugins || {};
    
    t.plugins.history = { 
        version: '1.0.2',       
        conf: {
            api: false
        }       
    };
        
    var hash, iframe;       

    function setIframe(h) {
        if (h) {
            var doc = iframe.contentWindow.document;
            doc.open().close(); 
            doc.location.hash = h;
        }
    }
    
    // jQuery plugin implementation
    $.fn.onHash = function(fn) {
            
        var el = this;
        
        // IE
        if ($.browser.msie && $.browser.version < '8') {
            
            // create iframe that is constantly checked for hash changes
            if (!iframe) {
                iframe = $("<iframe/>").attr("src", "javascript:false;").hide().get(0);
                $("body").append(iframe);
                                
                setInterval(function() {
                    var idoc = iframe.contentWindow.document, 
                         h = idoc.location.hash;
                
                    if (hash !== h) {                       
                        $.event.trigger("hash", h);
                        hash = h;
                    }
                }, 100);
                
                setIframe(location.hash || '#');
            }
            
            // when link is clicked the iframe hash updated
            el.bind("click.hash", function(e) {
                setIframe($(this).attr("href"));
            }); 

            
        // other browsers scans for location.hash changes directly withou iframe hack
        } else { 
            setInterval(function() {
                var h = location.hash;
                var els = el.filter("[href$=" + h + "]");
                
                if (!els.length) { 
                    h = h.replace("#", "");
                    els = el.filter("[href$=" + h + "]");
                }
                
                if (els.length && h !== hash) {
                    hash = h;
                    $.event.trigger("hash", h);
                }                       
            }, 100);
        }
         
        // bind a history listener
        $(window).bind("hash", fn);
        
        // return jQuery
        return this;        
    };  
    

    $.fn.history = function(conf) {
    
        var globals = $.extend({}, t.plugins.history.conf), ret;
        conf = $.extend(globals, conf);
        
        this.each(function() {
            
            var api = $(this).tabs(), 
                 tabs = api.getTabs();
                 
            if (api) { ret = api; }
            
            // enable history support
            tabs.onHash(function(evt, hash) {
                if (!hash || hash == '#') { hash = api.getConf().initialIndex; }
                api.click(hash);        
            });   
            
            // tab clicks perform their original action
            tabs.click(function(e) {
                location.hash = $(this).attr("href").replace("#tab-", "");
            }); 

        });
        
        return conf.api ? ret : this;
        
    };
        
})(jQuery);