/*
 * jQuery.include - A dynamic javascript/css loader plugin for jQuery.
 *
 * Copyright (c) 2007 Dave Stewart <dave@yesterdave.com>, http://www.yesterdave.com
 * Licensed under the MIT License:
 * http://www.opensource.org/licenses/mit-license.php
 * 
 * $Version: 2007.04.27 +r3
 *
 * hard time figuring out a way to ensure js/css is loaded before proceeding with the next file
 *   - use ajax to get js/css file then inject it in a new script/style tag
 *
 * hard time trying to figure out why safari wouldn't work with either:
 *   - script.onload
 *   - script.text
 * finally found http://tobielangel.com/2007/2/23/to-eval-or-not-to-eval
 *   - append javscript text to script tag with document.createTextNode
 *
 * keep in mind that no two external files should have the same name, becase path is disregarded
 *
 * Options:
 *   - sync: determines whether or not the files are load synchronously (Default: true)
 *   - onload: the function to run after all the files are loaded (Default: null)
 *   - jsBase: the base directory where javascript files are found (Default: '')
 *   - cssBase: the base directory where css files are found (Default: '')
 *
 */
(function($){
	var list = {};
	var queue = [];
	var running = false;
	var add = function(file, o){
		o = $.extend({sync: true, onload: null, jsBase: '', cssBase: ''}, o || {});
		fillList();
		var files = file.split(',');
		var len = files.length;
		$.each(files, function(i, file){
			file = (file.indexOf('.css') > -1 ? o.cssBase : o.jsBase) + file;
			var cb = (i == len - 1) ? o.onload : null;
			if (!o.sync)
				insert(file, cb || function(){}, false);
			else
				queue.push({file: file, onload: cb});
		});
		if (!running)
			next();
	};
	var next = function(){
		if (queue.length > 0) {
			running = true;
			var item = queue.shift();
			var cb = function(){
				if (item.onload)
					item.onload();
				next();
			};
			insert(item.file, cb, true);
		} else
			running = false;
	};
	var insert = function(file, cb, sync){
		if (!list[file]) {
			list[file] = true;
			if (file.indexOf('.css') > -1)
				createCSS(file, cb, sync);
			else
			    createJS(file, cb, sync);
		} else
			cb();
	};
	var createJS = function(file, cb, sync){
		if (!sync) {
		    $(document.createElement('script')).attr({type: 'text/javascript', src: file}).appendTo('head');
		    cb();
		} else {
	        $.get(file, null, function(jsText){
                var s = $(document.createElement('script')).attr('type', 'text/javascript');
                if ($.browser.safari)
                    s.append(document.createTextNode(jsText));
                else
                    s[0].text = jsText; 
                s.appendTo('head');
                cb();
	        });
		}
	}
	var createCSS = function(file, cb, sync){
		if (!sync) {
		    $(document.createElement('link')).attr({type: 'text/css', rel: 'stylesheet', href: file}).appendTo('head');
		    cb();
		} else {
		    $.get(file, null, function(cssText){
                if ($.browser.msie) {
                    var s = document.createStyleSheet();
                    s.cssText = cssText;
                } else {
                    var s = $(document.createElement('style')).attr('type', 'text/css');
                    try {
                        s.append(document.createTextNode(cssText));
                    } catch (e) {
                        s[0].cssText = cssText; 
                    }
                    s.appendTo('head');
                }
                cb();
		    });
		}
	};
	var fillList = function(){
		var toAdd = [];
		$("script").each(function(){
			toAdd.push(this.src);
		});
		$("link").each(function(){
			toAdd.push(this.href);
		});
		$.each(toAdd, function(i, file){
			if (file && file.length > 0 && file != '//:')
				list[stripPath(file)] = true;
		});
	};
	var stripPath = function(href){
		return href.substring(href.lastIndexOf('/') + 1);
	};
	$.extend({
		include: add,
		externalResources: list
	});
	$(fillList);
})(jQuery);