/*!*
 * @filename include.jquery.js
 * @name jQuery Include File
 * @type jQuery
 * @projectDescription Include a file (css and js) in a head of the document and execute
 * @date 08/07/2008
 * @version 1.0
 * @cat Ajax
 * @require
 * @author Alex
 * @param required none url String|Array The address of the plugin that will be inserted.
 * You can pass a indexed array of url
 * @param optional none callback Function The function to be executed after the file has loaded
 * @example
 * $.include('/foo/test/file.js');
 * @desc load the current script
 * @example
 * var files = ['test.js','another.js','onemore.js'];
 * $.include(files,function(){
 *              //execute some code after all scripts are completed
 * });
 * @desc load all the script inside the array
 * @return false | Element (object)
 */

(function($) {

        $.extend({
                // You can change the base path to be applied in all imports
                ImportBasePath: '',
                // Associative array storing wating tasks and their callback
                __WaitingTasks: new Object(),
                // Called when a single file is loaded successfully - update and check WaitingTasks to see if it's ok to load callback
                __loadedSuccessfully: function(taskId){
                        if (taskId in $.__WaitingTasks){
                                if (($.__WaitingTasks[taskId].loading -= 1) < 1){
                                        var callback = $.__WaitingTasks[taskId].task;
                                        if (typeof callback == 'function') {
                                                callback();
                                        }
                                        delete $.__WaitingTasks[taskId];
                                }
                        }
                },
                //pass a file name and return a array with file name and extension
                fileinfo:       function(data){
            data = data.replace(/^\s|\s$/g, "");
                        var m;
            if (/\.\w+$/.test(data)) {
                m = data.match(/([^\/\\]+)\.(\w+)$/);
                if (m) {
                                        if (m[2] == 'js') {
                                                return {
                                                        filename: m[1],
                                                        ext: m[2],
                                                        tag: 'script'
                                                };
                                        }
                                        else
                                                if (m[2] == 'css') {
                                                        return {
                                                                filename: m[1],
                                                                ext: m[2],
                                                                tag: 'link'
                                                        };
                                                }
                                                else {
                                                        return {
                                                                filename: m[1],
                                                                ext: m[2],
                                                                tag: null
                                                        };
                                                }
                                }
                                else {
                                        return {
                                                filename: null,
                                                ext: null
                                        };
                                }
            } else {
                m = data.match(/([^\/\\]+)$/);
                if (m) {
                                        return {
                                                filename: m[1],
                                                ext: null,
                                                tag: null
                                        };
                                }
                                else {
                                        return {
                                                filename: null,
                                                ext: null,
                                                tag: null
                                        };
                                }      
            }
        },
                //Check if the file that is been included already exist and return a Boolean value
                fileExist: function(filename,filetype,attrCheck) {
                        var elementsArray = document.getElementsByTagName(filetype);
                        for(var i=0;i<elementsArray.length;i++) {
                                if(elementsArray[i].getAttribute(attrCheck)==$.ImportBasePath+filename) {
                                        return true;
                                }
                        }
                        return false;
                },
                //Create the element depending of the file type and return the element (Object)
                createElement: function(filename,filetype) {
                        switch(filetype) {
                                case 'script' :
                                if (!$.fileExist(filename, filetype, 'src')) {
                                        var scriptTag = document.createElement(filetype);
                                        scriptTag.setAttribute('language', 'javascript');
                                        scriptTag.setAttribute('type', 'text/javascript');
                                        scriptTag.setAttribute('src', $.ImportBasePath + filename);
                                        return scriptTag;
                                } else {
                                        return false;
                                }
                                break;
                                case 'link' :
                                if (!$.fileExist(filename, filetype, 'href')) {
                                        var styleTag = document.createElement(filetype);
                                        styleTag.setAttribute('type', 'text/css');
                                        styleTag.setAttribute('rel', 'stylesheet');
                                        styleTag.setAttribute('href', $.ImportBasePath + filename);
                                        return styleTag;
                                } else {
                                        return false;
                                }
                                break;

                                default :
                                        return false;
                                break;
                        }
                },
                cssReady: function(index, taskId) {
                        function check() {
                                if(document.styleSheets[index]){
                                        window.clearInterval(checkInterval);
                                        $.__loadedSuccessfully(taskId);
                                }
                        }
                        var checkInterval = window.setInterval(check,200);
                },
                //The main function to insert the file
                include: function(file,callback) {
                        var headerTag = document.getElementsByTagName('head')[0];
                        var fileArray = [];
                        //if file is string, give a single index element
                        typeof file=='string' ? fileArray[0] = file : fileArray = file;
                        // Create a unique id using the current time
                        var taskId = new Date().getTime().toString();
                        $.__WaitingTasks[taskId] = {'loading': fileArray.length, 'task': callback};
                        //go through all the files
                        for (var i = 0; i < fileArray.length; i++) {
                                var elementTag = $.fileinfo(fileArray[i]).tag;
                                var el = [];
                                if (elementTag !== null) {
                                        el[i] = $.createElement(fileArray[i], elementTag);
                                        if (el[i]) {
                                                headerTag.appendChild(el[i]);
                                                if ($.browser.msie) {
                                                        el[i].onreadystatechange = function(){
                                                                if (this.readyState === 'loaded' || this.readyState === 'complete') {
                                                                        $.__loadedSuccessfully(taskId);
                                                                }
                                                        };
                                                }
                                                else {
                                                        if (elementTag == 'link') {
                                                                $.cssReady(i, taskId);
                                                        }
                                                        else {
                                if (/WebKit/i.test(navigator.userAgent)) {
                                    var _timer = setInterval(function(){
                                        if (/loaded|complete/.test(document.readyState)) {
                                            $.__loadedSuccessfully(taskId); // call of the call
                                        }
                                    }, 100);
                                }
                                                                el[i].onload = function(){
                                                                        $.__loadedSuccessfully(taskId);
                                                                };
                                                        }
                                                }
                                        }else{
                                                $.__loadedSuccessfully(taskId);
                                        }
                                } else {
                                        return false;
                                }
                        }
                }
        });

})(jQuery);