/*!
 * jQuery QueryString v0.9.0 (Beta version)
 *
 * http://www.darlesson.com/
 *
 * Copyright 2010, Darlesson Oliveira
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 * @requires jQuery v1.3.2 or above
 *
 * Reporting bugs, comments or suggestions: http://darlesson.com/contact/
 * Documentation and other jQuery plug-ins: http://darlesson.com/jquery/
 * Donations are welcome: http://darlesson.com/donate/
 */

// QueryString
(function($){

    $.QueryString = function( queryString, options ){
		
		var defaults = {
				href : window.location.href, // href may be informed or the website URL will be considered
				index : null, // If index is not informed and there is more than one querystring with the same name, an array will be returned
				isCaseSensitive : true
			}, settings = $.extend({}, defaults, options );
		
		var isCaseSensitive = settings.isCaseSensitive,
			queryString = ( queryString == null )? null:( isCaseSensitive )? queryString.toString():queryString.toString().toLowerCase(),
			href = settings.href.toString(),
			href = ( href.lastIndexOf("?") > -1 )? href.substring( href.lastIndexOf("?") + 1, href.length ):null;
		
		this.size = 0;
		
		if( href && !queryString ){ // Return the query strings as objects
			var arr = href.split("&"),
				arrValue = "",
				thisObject = "";
			
			this.size = arr.length;
			
			for( var x = 0; x < arr.length; x++){
				var query = ( isCaseSensitive )? arr[x].split("=")[0]:arr[x].split("=")[0].toLowerCase(),
					value = arr[x].split("=")[1],
					insertComma = ( arrValue == "" )? "[{":", " ;
				
				arrValue += ( insertComma + "" + query + " : '" + value + "'" );
				thisObject += ( "this." + query + " = '" + value + "';" ); 
			}
			
			arrValue = eval( arrValue + "}]" )[0];
			eval( thisObject );
					
			return this;
		}else if( href && queryString && href.indexOf(queryString + "=") > -1 ){ // Return the query string informed
			var arr = href.split("&"),
				firstItemValue = null,
				count = 0,
				arrValue = new Array();
				
			for( var x = 0; x < arr.length; x++){
				var query = ( isCaseSensitive )? arr[x].split("=")[0]:arr[x].split("=")[0].toLowerCase(),
					value = arr[x].split("=")[1];
				
				if( isNaN(settings.index) || settings.index > arr.length ){ // If the index informed doesn't exist, null will be returned
					return null;
				}else if( query == queryString && settings.index === x ){ // If the index is right the value will be returned
					return value;
				}else if( query == queryString ){
					if( !firstItemValue ){
						firstItemValue = value;
					};
					arrValue[count] = value;
					count += 1;
				};
			};
			
			if( arrValue.length > 1 ){
				return arrValue;
			}else{
				return firstItemValue;
			};
			
		}else if( href && queryString && href.indexOf(queryString + "=") == -1 ){
			return null;	
		};
		
		return null;
        
    };
    
})(jQuery);