/**

 * @license Copyright (c) 2003-2013, CKSource - Frederico Knabben. All rights reserved.

 * For licensing, see LICENSE.md or http://ckeditor.com/license

 */



(function() {

	var loadedLangs = {};



	/**

	 * Holds language related functions.

	 *

	 * @class

	 * @singleton

	 */

	CKEDITOR.lang = {

		/**

		 * The list of languages available in the editor core.

		 *

		 *		alert( CKEDITOR.lang.en ); // 1

		 */

		languages: { 'af':1,'ar':1,'bg':1,'bn':1,'bs':1,'ca':1,'cs':1,'cy':1,'da':1,'de':1,'el':1,'en-au':1,'en-ca':1,'en-gb':1,'en':1,'eo':1,'es':1,'et':1,'eu':1,'fa':1,'fi':1,'fo':1,'fr-ca':1,'fr':1,'gl':1,'gu':1,'he':1,'hi':1,'hr':1,'hu':1,'id':1,'is':1,'it':1,'ja':1,'ka':1,'km':1,'ko':1,'ku':1,'lt':1,'lv':1,'mk':1,'mn':1,'ms':1,'nb':1,'nl':1,'no':1,'pl':1,'pt-br':1,'pt':1,'ro':1,'ru':1,'si':1,'sk':1,'sl':1,'sq':1,'sr-latn':1,'sr':1,'sv':1,'th':1,'tr':1,'ug':1,'uk':1,'vi':1,'zh-cn':1,'zh':1 },



		/**

		 * Loads a specific language file, or auto detect it. A callback is

		 * then called when the file gets loaded.

		 *

		 * @param {String} languageCode The code of the language file to be

		 * loaded. If null or empty, autodetection will be performed. The

		 * same happens if the language is not supported.

		 * @param {String} defaultLanguage The language to be used if

		 * languageCode is not supported or if the autodetection fails.

		 * @param {Function} callback A function to be called once the

		 * language file is loaded. Two parameters are passed to this

		 * function: the language code and the loaded language entries.

		 */

		load: function( languageCode, defaultLanguage, callback ) {

			// If no languageCode - fallback to browser or default.

			// If languageCode - fallback to no-localized version or default.

			if ( !languageCode || !CKEDITOR.lang.languages[ languageCode ] )

				languageCode = this.detect( defaultLanguage, languageCode );



			if ( !this[ languageCode ] ) {

				CKEDITOR.scriptLoader.load( CKEDITOR.getUrl( 'lang/' + languageCode + '.js' ), function() {

					callback( languageCode, this[ languageCode ] );

				}, this );

			} else

				callback( languageCode, this[ languageCode ] );

		},



		/**

		 * Returns the language that best fit the user language. For example,

		 * suppose that the user language is "pt-br". If this language is

		 * supported by the editor, it is returned. Otherwise, if only "pt" is

		 * supported, it is returned instead. If none of the previous are

		 * supported, a default language is then returned.

		 *

		 *		alert( CKEDITOR.lang.detect( 'en' ) ); // e.g., in a German browser: 'de'

		 *

		 * @param {String} defaultLanguage The default language to be returned

		 * if the user language is not supported.

		 * @param {String} [probeLanguage] A language code to try to use,

		 * instead of the browser based autodetection.

		 * @returns {String} The detected language code.

		 */

		detect: function( defaultLanguage, probeLanguage ) {

			var languages = this.languages;

			probeLanguage = probeLanguage || navigator.userLanguage || navigator.language || defaultLanguage;



			var parts = probeLanguage.toLowerCase().match( /([a-z]+)(?:-([a-z]+))?/ ),

				lang = parts[ 1 ],

				locale = parts[ 2 ];



			if ( languages[ lang + '-' + locale ] )

				lang = lang + '-' + locale;

			else if ( !languages[ lang ] )

				lang = null;



			CKEDITOR.lang.detect = lang ?

			function() {

				return lang;

			} : function( defaultLanguage ) {

				return defaultLanguage;

			};



			return lang || defaultLanguage;

		}

	};



})();