class MediaTranslationTest

class MediaTranslationTest extends MediaKernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'language',
        'content_translation',
    ];
    
    /**
     * The test media translation type.
     *
     * @var \Drupal\media\MediaTypeInterface
     */
    protected $testTranslationMediaType;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->installConfig([
            'language',
        ]);
        // Create a test media type for translations.
        $this->testTranslationMediaType = $this->createMediaType('test_translation');
        for ($i = 0; $i < 3; ++$i) {
            $language_id = 'l' . $i;
            ConfigurableLanguage::create([
                'id' => $language_id,
                'label' => $this->randomString(),
            ])
                ->save();
            file_put_contents('public://' . $language_id . '.png', '');
        }
    }
    
    /**
     * Tests translatable fields storage/retrieval.
     */
    public function testTranslatableFieldSaveLoad() : void {
        
        /** @var \Drupal\Core\Entity\EntityTypeInterface $entity_type */
        $entity_type = $this->container
            ->get('entity_type.manager')
            ->getDefinition('media');
        $this->assertTrue($entity_type->isTranslatable(), 'Media is translatable.');
        // Check if the translation handler uses the content_translation handler.
        $translation_handler_class = $entity_type->getHandlerClass('translation');
        $this->assertEquals(ContentTranslationHandler::class, $translation_handler_class, 'Translation handler is set to use the content_translation handler.');
        // Prepare the field translations.
        $source_field_definition = $this->testTranslationMediaType
            ->getSource()
            ->getSourceFieldDefinition($this->testTranslationMediaType);
        $source_field_storage = $source_field_definition->getFieldStorageDefinition();
        
        /** @var \Drupal\Core\Entity\Sql\SqlContentEntityStorage $media_storage */
        $media_storage = $this->container
            ->get('entity_type.manager')
            ->getStorage('media');
        
        /** @var \Drupal\media\Entity\Media $media */
        $media = $media_storage->create([
            'bundle' => $this->testTranslationMediaType
                ->id(),
            'name' => 'Unnamed',
        ]);
        $field_translations = [];
        $available_langcodes = array_keys($this->container
            ->get('language_manager')
            ->getLanguages());
        $media->set('langcode', reset($available_langcodes));
        foreach ($available_langcodes as $langcode) {
            $values = [];
            for ($i = 0; $i < $source_field_storage->getCardinality(); $i++) {
                $values[$i]['value'] = $this->randomString();
            }
            $field_translations[$langcode] = $values;
            $translation = $media->hasTranslation($langcode) ? $media->getTranslation($langcode) : $media->addTranslation($langcode);
            $translation->{$source_field_definition->getName()}
                ->setValue($field_translations[$langcode]);
        }
        // Save and reload the field translations.
        $media->save();
        $media_storage->resetCache();
        $media = $media_storage->load($media->id());
        // Check if the correct source field values were saved/loaded.
        foreach ($field_translations as $langcode => $items) {
            
            /** @var \Drupal\media\MediaInterface $media_translation */
            $media_translation = $media->getTranslation($langcode);
            $result = TRUE;
            foreach ($items as $delta => $item) {
                $result = $result && $item['value'] == $media_translation->{$source_field_definition->getName()}[$delta]->value;
            }
            $this->assertTrue($result, "{$langcode} translation field value not correct.");
            $this->assertSame('public://' . $langcode . '.png', $media_translation->getSource()
                ->getMetadata($media_translation, 'thumbnail_uri'), "{$langcode} translation thumbnail metadata attribute is not correct.");
            $this->assertSame('public://' . $langcode . '.png', $media_translation->get('thumbnail')->entity
                ->getFileUri(), "{$langcode} translation thumbnail value is not correct.");
            $this->assertEquals('Test Thumbnail ' . $langcode, $media_translation->getSource()
                ->getMetadata($media_translation, 'test_thumbnail_alt'), "{$langcode} translation thumbnail alt metadata attribute is not correct.");
            $this->assertSame('Test Thumbnail ' . $langcode, $media_translation->get('thumbnail')->alt, "{$langcode} translation thumbnail alt value is not correct.");
        }
    }

}