<?php
  
  /*
   * This file is part of the Symfony package.
   *
   * (c) Fabien Potencier <fabien@symfony.com>
   *
   * 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;
  use Symfony\Contracts\Translation\LocaleAwareInterface;
  use Symfony\Contracts\Translation\TranslatorInterface;
  
  /**
   * @author Abdellatif Ait boudad <a.aitboudad@gmail.com>
   */
  class LoggingTranslator implements TranslatorInterface, TranslatorBagInterface, LocaleAwareInterface
  {
      private $translator;
      private $logger;
  
      /**
       * @param TranslatorInterface&TranslatorBagInterface&LocaleAwareInterface $translator The translator must implement TranslatorBagInterface
       */
      public function __construct(TranslatorInterface $translator, LoggerInterface $logger)
      {
          if (!$translator instanceof TranslatorBagInterface || !$translator instanceof LocaleAwareInterface) {
              throw new InvalidArgumentException(sprintf('The Translator "%s" must implement TranslatorInterface, TranslatorBagInterface and LocaleAwareInterface.', get_debug_type($translator)));
          }
  
          $this->translator = $translator;
          $this->logger = $logger;
      }
  
      /**
       * {@inheritdoc}
       */
      public function trans(?string $id, array $parameters = [], ?string $domain = null, ?string $locale = null)
      {
          $trans = $this->translator->trans($id = (string) $id, $parameters, $domain, $locale);
          $this->log($id, $domain, $locale);
  
          return $trans;
      }
  
      /**
       * {@inheritdoc}
       */
      public function setLocale(string $locale)
      {
          $prev = $this->translator->getLocale();
          $this->translator->setLocale($locale);
          if ($prev === $locale) {
              return;
          }
  
          $this->logger->debug(sprintf('The locale of the translator has changed from "%s" to "%s".', $prev, $locale));
      }
  
      /**
       * {@inheritdoc}
       */
      public function getLocale()
      {
          return $this->translator->getLocale();
      }
  
      /**
       * {@inheritdoc}
       */
      public function getCatalogue(?string $locale = null)
      {
          return $this->translator->getCatalogue($locale);
      }
  
      /**
       * {@inheritdoc}
       */
      public function getCatalogues(): array
      {
          return $this->translator->getCatalogues();
      }
  
      /**
       * Gets the fallback locales.
       *
       * @return array
       */
      public function getFallbackLocales()
      {
          if ($this->translator instanceof Translator || method_exists($this->translator, 'getFallbackLocales')) {
              return $this->translator->getFallbackLocales();
          }
  
          return [];
      }
  
      /**
       * Passes through all unknown calls onto the translator object.
       */
      public function __call(string $method, array $args)
      {
          return $this->translator->{$method}(...$args);
      }
  
      /**
       * Logs for missing translations.
       */
      private function log(string $id, ?string $domain, ?string $locale)
      {
          if (null === $domain) {
              $domain = 'messages';
          }
  
          $catalogue = $this->translator->getCatalogue($locale);
          if ($catalogue->defines($id, $domain)) {
              return;
          }
  
          if ($catalogue->has($id, $domain)) {
              $this->logger->debug('Translation use fallback catalogue.', ['id' => $id, 'domain' => $domain, 'locale' => $catalogue->getLocale()]);
          } else {
              $this->logger->warning('Translation not found.', ['id' => $id, 'domain' => $domain, 'locale' => $catalogue->getLocale()]);
          }
      }
  }