class MediaEmbedFilterTestBase

abstract class MediaEmbedFilterTestBase extends KernelTestBase {
    use MediaTypeCreationTrait;
    use TestFileCreationTrait;
    use UserCreationTrait {
        createUser as drupalCreateUser;
        createRole as drupalCreateRole;
    }
    
    /**
     * The UUID to use for the embedded entity.
     *
     * @var string
     */
    const EMBEDDED_ENTITY_UUID = 'e7a3e1fe-b69b-417e-8ee4-c80cb7640e63';
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'field',
        'file',
        'filter',
        'image',
        'media',
        'system',
        'text',
        'user',
    ];
    
    /**
     * The image file to use in tests.
     *
     * @var \Drupal\file\FileInterface
     */
    protected $image;
    
    /**
     * The sample Media entity to embed.
     *
     * @var \Drupal\media\MediaInterface
     */
    protected $embeddedEntity;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        $this->installSchema('file', [
            'file_usage',
        ]);
        $this->installSchema('system', 'sequences');
        $this->installEntitySchema('file');
        $this->installEntitySchema('media');
        $this->installEntitySchema('user');
        $this->installConfig('filter');
        $this->installConfig('image');
        $this->installConfig('media');
        $this->installConfig('system');
        // Create a user with required permissions. Ensure that we don't use user 1
        // because that user is treated in special ways by access control handlers.
        $admin_user = $this->drupalCreateUser([]);
        $user = $this->drupalCreateUser([
            'access content',
            'view media',
        ]);
        $this->container
            ->set('current_user', $user);
        $this->image = File::create([
            'uri' => $this->getTestFiles('image')[0]->uri,
            'uid' => 2,
        ]);
        $this->image
            ->setPermanent();
        $this->image
            ->save();
        // Create a sample media entity to be embedded.
        $media_type = $this->createMediaType('image', [
            'id' => 'image',
        ]);
        EntityViewMode::create([
            'id' => 'media.foobar',
            'targetEntityType' => 'media',
            'status' => TRUE,
            'enabled' => TRUE,
            'label' => $this->randomMachineName(),
        ])
            ->save();
        EntityViewDisplay::create([
            'targetEntityType' => 'media',
            'bundle' => $media_type->id(),
            'mode' => 'foobar',
            'status' => TRUE,
        ])
            ->removeComponent('thumbnail')
            ->removeComponent('created')
            ->removeComponent('uid')
            ->setComponent('field_media_image', [
            'label' => 'visually_hidden',
            'type' => 'image',
            'settings' => [
                'image_style' => 'medium',
                'image_link' => 'file',
            ],
            'third_party_settings' => [],
            'weight' => 1,
            'region' => 'content',
        ])
            ->save();
        $media = Media::create([
            'uuid' => static::EMBEDDED_ENTITY_UUID,
            'bundle' => 'image',
            'name' => 'Screaming hairy armadillo',
            'field_media_image' => [
                [
                    'target_id' => $this->image
                        ->id(),
                    'alt' => 'default alt',
                    'title' => 'default title',
                ],
            ],
        ])
            ->setOwner($user);
        $media->save();
        $this->embeddedEntity = $media;
    }
    
    /**
     * Gets an embed code with given attributes.
     *
     * @param array $attributes
     *   The attributes to add.
     *
     * @return string
     *   A string containing a drupal-media DOM element.
     *
     * @see assertEntityEmbedFilterHasRun()
     */
    protected function createEmbedCode(array $attributes) {
        $dom = Html::load('<drupal-media>This placeholder should not be rendered.</drupal-media>');
        $xpath = new \DOMXPath($dom);
        $drupal_entity = $xpath->query('//drupal-media')[0];
        foreach ($attributes as $attribute => $value) {
            $drupal_entity->setAttribute($attribute, $value);
        }
        return Html::serialize($dom);
    }
    
    /**
     * Applies the `@Filter=media_embed` filter to text, pipes to raw content.
     *
     * @param string $text
     *   The text string to be filtered.
     * @param string $langcode
     *   The language code of the text to be filtered.
     *
     * @return \Drupal\filter\FilterProcessResult
     *   The filtered text, wrapped in a FilterProcessResult object, and possibly
     *   with associated assets, cacheability metadata and placeholders.
     *
     * @see \Drupal\Tests\media\Kernel\MediaEmbedFilterTestBase::createEmbedCode()
     * @see \Drupal\KernelTests\AssertContentTrait::setRawContent()
     */
    protected function applyFilter($text, $langcode = 'en') {
        $this->assertStringContainsString('<drupal-media', $text);
        $this->assertStringContainsString('This placeholder should not be rendered.', $text);
        $filter_result = $this->processText($text, $langcode);
        $output = $filter_result->getProcessedText();
        $this->assertStringNotContainsString('<drupal-media', $output);
        $this->assertStringNotContainsString('This placeholder should not be rendered.', $output);
        $this->setRawContent($output);
        return $filter_result;
    }
    
    /**
     * Assert that the SimpleXMLElement object has the given attributes.
     *
     * @param \SimpleXMLElement $element
     *   The SimpleXMLElement object to check.
     * @param array $expected_attributes
     *   An array of expected attributes.
     */
    protected function assertHasAttributes(\SimpleXMLElement $element, array $expected_attributes) {
        foreach ($expected_attributes as $attribute => $value) {
            if ($value === NULL) {
                $this->assertNull($element[$attribute]);
            }
            else {
                $this->assertSame((string) $value, (string) $element[$attribute]);
            }
        }
    }
    
    /**
     * Processes text through the provided filters.
     *
     * @param string $text
     *   The text string to be filtered.
     * @param string $langcode
     *   The language code of the text to be filtered.
     * @param string[] $filter_ids
     *   (optional) The filter plugin IDs to apply to the given text, in the order
     *   they are being requested to be executed.
     *
     * @return \Drupal\filter\FilterProcessResult
     *   The filtered text, wrapped in a FilterProcessResult object, and possibly
     *   with associated assets, cacheability metadata and placeholders.
     *
     * @see \Drupal\filter\Element\ProcessedText::preRenderText()
     */
    protected function processText($text, $langcode = LanguageInterface::LANGCODE_NOT_SPECIFIED, array $filter_ids = [
        'media_embed',
    ]) {
        $manager = $this->container
            ->get('plugin.manager.filter');
        $bag = new FilterPluginCollection($manager, []);
        $filters = [];
        foreach ($filter_ids as $filter_id) {
            $filters[] = $bag->get($filter_id);
        }
        $render_context = new RenderContext();
        
        /** @var \Drupal\filter\FilterProcessResult $filter_result */
        $filter_result = $this->container
            ->get('renderer')
            ->executeInRenderContext($render_context, function () use ($text, $filters, $langcode) {
            $metadata = new BubbleableMetadata();
            foreach ($filters as $filter) {
                
                /** @var \Drupal\filter\FilterProcessResult $result */
                $result = $filter->process($text, $langcode);
                $metadata = $metadata->merge($result);
                $text = $result->getProcessedText();
            }
            return (new FilterProcessResult($text))->merge($metadata);
        });
        if (!$render_context->isEmpty()) {
            $filter_result = $filter_result->merge($render_context->pop());
        }
        return $filter_result;
    }

}