class FileFieldTestBase

abstract class FileFieldTestBase extends BrowserTestBase {
    use FileFieldCreationTrait;
    use TestFileCreationTrait {
        getTestFiles as drupalGetTestFiles;
    }
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'node',
        'file',
        'file_module_test',
        'field_ui',
    ];
    
    /**
     * A user with administration permissions.
     *
     * @var \Drupal\user\UserInterface
     */
    protected $adminUser;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        $this->adminUser = $this->drupalCreateUser([
            'access content',
            'access administration pages',
            'administer site configuration',
            'administer users',
            'administer permissions',
            'administer content types',
            'administer node fields',
            'administer node display',
            'administer nodes',
            'bypass node access',
        ]);
        $this->drupalLogin($this->adminUser);
        $this->drupalCreateContentType([
            'type' => 'article',
            'name' => 'Article',
        ]);
    }
    
    /**
     * Retrieves a sample file of the specified type.
     *
     * @return \Drupal\file\FileInterface
     *   The new unsaved file entity.
     */
    public function getTestFile($type_name, $size = NULL) {
        // Get a file to upload.
        $file = current($this->drupalGetTestFiles($type_name, $size));
        // Add a filesize property to files as would be read by
        // \Drupal\file\Entity\File::load().
        $file->filesize = filesize($file->uri);
        return File::create((array) $file);
    }
    
    /**
     * Retrieves the fid of the last inserted file.
     */
    public function getLastFileId() {
        return (int) \Drupal::entityQueryAggregate('file')->accessCheck(FALSE)
            ->aggregate('fid', 'max')
            ->execute()[0]['fid_max'];
    }
    
    /**
     * Updates an existing file field with new settings.
     */
    public function updateFileField($name, $type_name, $field_settings = [], $widget_settings = []) {
        $field = FieldConfig::loadByName('node', $type_name, $name);
        $field->setSettings(array_merge($field->getSettings(), $field_settings));
        $field->save();
        \Drupal::service('entity_display.repository')->getFormDisplay('node', $type_name)
            ->setComponent($name, [
            'settings' => $widget_settings,
        ])
            ->save();
    }
    
    /**
     * Uploads a file to a node.
     *
     * @param \Drupal\file\FileInterface $file
     *   The File to be uploaded.
     * @param string $field_name
     *   The name of the field on which the files should be saved.
     * @param $nid_or_type
     *   A numeric node id to upload files to an existing node, or a string
     *   indicating the desired bundle for a new node.
     * @param bool $new_revision
     *   The revision number.
     * @param array $extras
     *   Additional values when a new node is created.
     *
     * @return int
     *   The node id.
     */
    public function uploadNodeFile(FileInterface $file, $field_name, $nid_or_type, $new_revision = TRUE, array $extras = []) {
        return $this->uploadNodeFiles([
            $file,
        ], $field_name, $nid_or_type, $new_revision, $extras);
    }
    
    /**
     * Uploads multiple files to a node.
     *
     * @param \Drupal\file\FileInterface[] $files
     *   The files to be uploaded.
     * @param string $field_name
     *   The name of the field on which the files should be saved.
     * @param $nid_or_type
     *   A numeric node id to upload files to an existing node, or a string
     *   indicating the desired bundle for a new node.
     * @param bool $new_revision
     *   The revision number.
     * @param array $extras
     *   Additional values when a new node is created.
     *
     * @return int
     *   The node id.
     */
    public function uploadNodeFiles(array $files, $field_name, $nid_or_type, $new_revision = TRUE, array $extras = []) {
        $edit = [
            'title[0][value]' => $this->randomMachineName(),
            'revision' => (string) (int) $new_revision,
        ];
        $node_storage = $this->container
            ->get('entity_type.manager')
            ->getStorage('node');
        if (is_numeric($nid_or_type)) {
            $nid = $nid_or_type;
            $node_storage->resetCache([
                $nid,
            ]);
            $node = $node_storage->load($nid);
        }
        else {
            // Add a new node.
            $extras['type'] = $nid_or_type;
            $node = $this->drupalCreateNode($extras);
            $nid = $node->id();
            // Save at least one revision to better simulate a real site.
            $node->setNewRevision();
            $node->save();
            $node_storage->resetCache([
                $nid,
            ]);
            $node = $node_storage->load($nid);
            $this->assertNotEquals($nid, $node->getRevisionId(), 'Node revision exists.');
        }
        $this->drupalGet("node/{$nid}/edit");
        $page = $this->getSession()
            ->getPage();
        // Attach files to the node.
        $field_storage = FieldStorageConfig::loadByName('node', $field_name);
        // File input name depends on number of files already uploaded.
        $field_num = count($node->{$field_name});
        foreach ($files as $i => $file) {
            $delta = $field_num + $i;
            $file_path = $this->container
                ->get('file_system')
                ->realpath($file->getFileUri());
            $name = 'files[' . $field_name . '_' . $delta . ']';
            if ($field_storage->getCardinality() != 1) {
                $name .= '[]';
            }
            if (count($files) == 1) {
                $edit[$name] = $file_path;
            }
            else {
                $page->attachFileToField($name, $file_path);
                $this->submitForm([], 'Upload');
            }
        }
        $this->submitForm($edit, 'Save');
        return $nid;
    }
    
    /**
     * Removes a file from a node.
     *
     * Note that if replacing a file, it must first be removed then added again.
     */
    public function removeNodeFile($nid, $new_revision = TRUE) {
        $edit = [
            'revision' => (string) (int) $new_revision,
        ];
        $this->drupalGet('node/' . $nid . '/edit');
        $this->submitForm([], 'Remove');
        $this->submitForm($edit, 'Save');
    }
    
    /**
     * Replaces a file within a node.
     */
    public function replaceNodeFile($file, $field_name, $nid, $new_revision = TRUE) {
        $edit = [
            'files[' . $field_name . '_0]' => \Drupal::service('file_system')->realpath($file->getFileUri()),
            'revision' => (string) (int) $new_revision,
        ];
        $this->drupalGet('node/' . $nid . '/edit');
        $this->submitForm([], 'Remove');
        $this->submitForm($edit, 'Save');
    }
    
    /**
     * Asserts that a file exists in the database.
     */
    public function assertFileEntryExists($file, $message = NULL) {
        $this->container
            ->get('entity_type.manager')
            ->getStorage('file')
            ->resetCache();
        $db_file = File::load($file->id());
        $message = $message ?? new FormattableMarkup('File %file exists in database at the correct path.', [
            '%file' => $file->getFileUri(),
        ]);
        $this->assertEquals($file->getFileUri(), $db_file->getFileUri(), $message);
    }
    
    /**
     * Asserts that a file does not exist in the database.
     */
    public function assertFileEntryNotExists($file, $message) {
        $this->container
            ->get('entity_type.manager')
            ->getStorage('file')
            ->resetCache();
        $message = $message ?? new FormattableMarkup('File %file exists in database at the correct path.', [
            '%file' => $file->getFileUri(),
        ]);
        $this->assertNull(File::load($file->id()), $message);
    }
    
    /**
     * Asserts that a file's status is set to permanent in the database.
     */
    public function assertFileIsPermanent(FileInterface $file, $message = NULL) {
        $message = $message ?? new FormattableMarkup('File %file is permanent.', [
            '%file' => $file->getFileUri(),
        ]);
        $this->assertTrue($file->isPermanent(), $message);
    }

}