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<?php
 /*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
 
 namespace Symfony\Component\Translation;
 
 use Psr\Log\LoggerInterface;
 use Symfony\Component\Translation\Exception\InvalidArgumentException;
 
 /**
 * @author Abdellatif Ait boudad <[email protected]>
 */
 class LoggingTranslator implements TranslatorInterface, TranslatorBagInterface
 {
 /**
 * @var TranslatorInterface|TranslatorBagInterface
 */
 private $translator;
 
 /**
 * @var LoggerInterface
 */
 private $logger;
 
 /**
 * @param TranslatorInterface $translator The translator must implement TranslatorBagInterface
 * @param LoggerInterface     $logger
 */
 public function __construct(TranslatorInterface $translator, LoggerInterface $logger)
 {
 if (!$translator instanceof TranslatorBagInterface) {
 throw new InvalidArgumentException(sprintf('The Translator "%s" must implement TranslatorInterface and TranslatorBagInterface.', get_class($translator)));
 }
 
 $this->translator = $translator;
 $this->logger = $logger;
 }
 
 /**
 * {@inheritdoc}
 */
 public function trans($id, array $parameters = array(), $domain = null, $locale = null)
 {
 $trans = $this->translator->trans($id, $parameters, $domain, $locale);
 $this->log($id, $domain, $locale);
 
 return $trans;
 }
 
 /**
 * {@inheritdoc}
 */
 public function transChoice($id, $number, array $parameters = array(), $domain = null, $locale = null)
 {
 $trans = $this->translator->transChoice($id, $number, $parameters, $domain, $locale);
 $this->log($id, $domain, $locale);
 
 return $trans;
 }
 
 /**
 * {@inheritdoc}
 */
 public function setLocale($locale)
 {
 $this->translator->setLocale($locale);
 }
 
 /**
 * {@inheritdoc}
 */
 public function getLocale()
 {
 return $this->translator->getLocale();
 }
 
 /**
 * {@inheritdoc}
 */
 public function getCatalogue($locale = null)
 {
 return $this->translator->getCatalogue($locale);
 }
 
 /**
 * Gets the fallback locales.
 *
 * @return array $locales The fallback locales
 */
 public function getFallbackLocales()
 {
 if ($this->translator instanceof Translator || method_exists($this->translator, 'getFallbackLocales')) {
 return $this->translator->getFallbackLocales();
 }
 
 return array();
 }
 
 /**
 * Passes through all unknown calls onto the translator object.
 */
 public function __call($method, $args)
 {
 return call_user_func_array(array($this->translator, $method), $args);
 }
 
 /**
 * Logs for missing translations.
 *
 * @param string      $id
 * @param string|null $domain
 * @param string|null $locale
 */
 private function log($id, $domain, $locale)
 {
 if (null === $domain) {
 $domain = 'messages';
 }
 
 $id = (string) $id;
 $catalogue = $this->translator->getCatalogue($locale);
 if ($catalogue->defines($id, $domain)) {
 return;
 }
 
 if ($catalogue->has($id, $domain)) {
 $this->logger->debug('Translation use fallback catalogue.', array('id' => $id, 'domain' => $domain, 'locale' => $catalogue->getLocale()));
 } else {
 $this->logger->warning('Translation not found.', array('id' => $id, 'domain' => $domain, 'locale' => $catalogue->getLocale()));
 }
 }
 }
 
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