<?php
/**
 * MessageController class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright Copyright &copy; 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\console\controllers;

use yii\console\Controller;

/**
 * This command extracts messages to be translated from source files.
 * The extracted messages are saved as PHP message source files
 * under the specified directory.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class MessageController extends Controller
{
	/**
	 * Searches for messages to be translated in the specified
	 * source files and compiles them into PHP arrays as message source.
	 *
	 * @param string $config the path of the configuration file. You can find
	 * an example in framework/messages/config.php.
	 *
	 * The file can be placed anywhere and must be a valid PHP script which
	 * returns an array of name-value pairs. Each name-value pair represents
	 * a configuration option.
	 *
	 * The following options are available:
	 *
	 *  - sourcePath: string, root directory of all source files.
	 *  - messagePath: string, root directory containing message translations.
	 *  - languages: array, list of language codes that the extracted messages
	 *    should be translated to. For example, array('zh_cn','en_au').
	 *  - fileTypes: array, a list of file extensions (e.g. 'php', 'xml').
	 *    Only the files whose extension name can be found in this list
	 *    will be processed. If empty, all files will be processed.
	 *  - exclude: array, a list of directory and file exclusions. Each
	 *    exclusion can be either a name or a path. If a file or directory name
	 *    or path matches the exclusion, it will not be copied. For example,
	 *    an exclusion of '.svn' will exclude all files and directories whose
	 *    name is '.svn'. And an exclusion of '/a/b' will exclude file or
	 *    directory 'sourcePath/a/b'.
	 *  - translator: the name of the function for translating messages.
	 *    Defaults to 'Yii::t'. This is used as a mark to find messages to be
	 *    translated.
	 *  - overwrite: if message file must be overwritten with the merged messages.
	 *  - removeOld: if message no longer needs translation it will be removed,
	 *    instead of being enclosed between a pair of '@@' marks.
	 *  - sort: sort messages by key when merging, regardless of their translation
	 *    state (new, obsolete, translated.)
	 */
	public function actionIndex($config)
	{
		if(!is_file($config))
			$this->usageError("the configuration file {$config} does not exist.");

		$config=require_once($config);

		$translator='Yii::t';
		extract($config);

		if(!isset($sourcePath,$messagePath,$languages))
			$this->usageError('The configuration file must specify "sourcePath", "messagePath" and "languages".');
		if(!is_dir($sourcePath))
			$this->usageError("The source path $sourcePath is not a valid directory.");
		if(!is_dir($messagePath))
			$this->usageError("The message path $messagePath is not a valid directory.");
		if(empty($languages))
			$this->usageError("Languages cannot be empty.");

		if(!isset($overwrite))
			$overwrite = false;

		if(!isset($removeOld))
			$removeOld = false;

		if(!isset($sort))
			$sort = false;

		$options=array();
		if(isset($fileTypes))
			$options['fileTypes']=$fileTypes;
		if(isset($exclude))
			$options['exclude']=$exclude;
		$files=CFileHelper::findFiles(realpath($sourcePath),$options);

		$messages=array();
		foreach($files as $file)
			$messages=array_merge_recursive($messages,$this->extractMessages($file,$translator));

		foreach($languages as $language)
		{
			$dir=$messagePath.DIRECTORY_SEPARATOR.$language;
			if(!is_dir($dir))
				@mkdir($dir);
			foreach($messages as $category=>$msgs)
			{
				$msgs=array_values(array_unique($msgs));
				$this->generateMessageFile($msgs,$dir.DIRECTORY_SEPARATOR.$category.'.php',$overwrite,$removeOld,$sort);
			}
		}
	}

	protected function extractMessages($fileName,$translator)
	{
		echo "Extracting messages from $fileName...\n";
		$subject=file_get_contents($fileName);
		$n=preg_match_all('/\b'.$translator.'\s*\(\s*(\'.*?(?<!\\\\)\'|".*?(?<!\\\\)")\s*,\s*(\'.*?(?<!\\\\)\'|".*?(?<!\\\\)")\s*[,\)]/s',$subject,$matches,PREG_SET_ORDER);
		$messages=array();
		for($i=0;$i<$n;++$i)
		{
			if(($pos=strpos($matches[$i][1],'.'))!==false)
				$category=substr($matches[$i][1],$pos+1,-1);
			else
				$category=substr($matches[$i][1],1,-1);
			$message=$matches[$i][2];
			$messages[$category][]=eval("return $message;");  // use eval to eliminate quote escape
		}
		return $messages;
	}

	protected function generateMessageFile($messages,$fileName,$overwrite,$removeOld,$sort)
	{
		echo "Saving messages to $fileName...";
		if(is_file($fileName))
		{
			$translated=require($fileName);
			sort($messages);
			ksort($translated);
			if(array_keys($translated)==$messages)
			{
				echo "nothing new...skipped.\n";
				return;
			}
			$merged=array();
			$untranslated=array();
			foreach($messages as $message)
			{
				if(!empty($translated[$message]))
					$merged[$message]=$translated[$message];
				else
					$untranslated[]=$message;
			}
			ksort($merged);
			sort($untranslated);
			$todo=array();
			foreach($untranslated as $message)
				$todo[$message]='';
			ksort($translated);
			foreach($translated as $message=>$translation)
			{
				if(!isset($merged[$message]) && !isset($todo[$message]) && !$removeOld)
				{
					if(substr($translation,0,2)==='@@' && substr($translation,-2)==='@@')
						$todo[$message]=$translation;
					else
						$todo[$message]='@@'.$translation.'@@';
				}
			}
			$merged=array_merge($todo,$merged);
			if($sort)
				ksort($merged);
			if($overwrite === false)
				$fileName.='.merged';
			echo "translation merged.\n";
		}
		else
		{
			$merged=array();
			foreach($messages as $message)
				$merged[$message]='';
			ksort($merged);
			echo "saved.\n";
		}
		$array=str_replace("\r",'',var_export($merged,true));
		$content=<<<EOD
<?php
/**
 * Message translations.
 *
 * This file is automatically generated by 'yiic message' command.
 * It contains the localizable messages extracted from source code.
 * You may modify this file by translating the extracted messages.
 *
 * Each array element represents the translation (value) of a message (key).
 * If the value is empty, the message is considered as not translated.
 * Messages that no longer need translation will have their translations
 * enclosed between a pair of '@@' marks.
 *
 * Message string can be used with plural forms format. Check i18n section
 * of the guide for details.
 *
 * NOTE, this file must be saved in UTF-8 encoding.
 */
return $array;

EOD;
		file_put_contents($fileName, $content);
	}
}