class FileFieldRevisionTest

class FileFieldRevisionTest extends FileFieldTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests creating multiple revisions of a node and managing attached files.
     *
     * Expected behaviors:
     *  - Adding a new revision will make another entry in the field table, but
     *    the original file will not be duplicated.
     *  - Deleting a revision should not delete the original file if the file
     *    is in use by another revision.
     *  - When the last revision that uses a file is deleted, the original file
     *    should be deleted also.
     */
    public function testRevisions() : void {
        // This test expects unused managed files to be marked as a temporary file
        // and then deleted up by file_cron().
        $this->config('file.settings')
            ->set('make_unused_managed_files_temporary', TRUE)
            ->save();
        $node_storage = $this->container
            ->get('entity_type.manager')
            ->getStorage('node');
        $type_name = 'article';
        $field_name = $this->randomMachineName();
        $this->createFileField($field_name, 'node', $type_name);
        // Create the same fields for users.
        $this->createFileField($field_name, 'user', 'user');
        $test_file = $this->getTestFile('text');
        // Create a new node with the uploaded file.
        $nid = $this->uploadNodeFile($test_file, $field_name, $type_name);
        // Check that the file exists on disk and in the database.
        $node_storage->resetCache([
            $nid,
        ]);
        $node = $node_storage->load($nid);
        $node_file_r1 = File::load($node->{$field_name}->target_id);
        $node_vid_r1 = $node->getRevisionId();
        $this->assertFileExists($node_file_r1->getFileUri());
        $this->assertFileEntryExists($node_file_r1, 'File entry exists in database on node creation.');
        $this->assertFileIsPermanent($node_file_r1, 'File is permanent.');
        // Upload another file to the same node in a new revision.
        $this->replaceNodeFile($test_file, $field_name, $nid);
        $node_storage->resetCache([
            $nid,
        ]);
        $node = $node_storage->load($nid);
        $node_file_r2 = File::load($node->{$field_name}->target_id);
        $node_vid_r2 = $node->getRevisionId();
        $this->assertFileExists($node_file_r2->getFileUri());
        $this->assertFileEntryExists($node_file_r2, 'Replacement file entry exists in database after creating new revision.');
        $this->assertFileIsPermanent($node_file_r2, 'Replacement file is permanent.');
        // Check that the original file is still in place on the first revision.
        $node = $node_storage->loadRevision($node_vid_r1);
        $current_file = File::load($node->{$field_name}->target_id);
        $this->assertEquals($node_file_r1->id(), $current_file->id(), 'Original file still in place after replacing file in new revision.');
        $this->assertFileExists($node_file_r1->getFileUri());
        $this->assertFileEntryExists($node_file_r1, 'Original file entry still in place after replacing file in new revision');
        $this->assertFileIsPermanent($node_file_r1, 'Original file is still permanent.');
        // Save a new version of the node without any changes.
        // Check that the file is still the same as the previous revision.
        $this->drupalGet('node/' . $nid . '/edit');
        $this->submitForm([
            'revision' => '1',
        ], 'Save');
        $node_storage->resetCache([
            $nid,
        ]);
        $node = $node_storage->load($nid);
        $node_file_r3 = File::load($node->{$field_name}->target_id);
        $node_vid_r3 = $node->getRevisionId();
        $this->assertEquals($node_file_r2->id(), $node_file_r3->id(), 'Previous revision file still in place after creating a new revision without a new file.');
        $this->assertFileIsPermanent($node_file_r3, 'New revision file is permanent.');
        // Revert to the first revision and check that the original file is active.
        $this->drupalGet('node/' . $nid . '/revisions/' . $node_vid_r1 . '/revert');
        $this->submitForm([], 'Revert');
        $node_storage->resetCache([
            $nid,
        ]);
        $node = $node_storage->load($nid);
        $node_file_r4 = File::load($node->{$field_name}->target_id);
        $this->assertEquals($node_file_r1->id(), $node_file_r4->id(), 'Original revision file still in place after reverting to the original revision.');
        $this->assertFileIsPermanent($node_file_r4, 'Original revision file still permanent after reverting to the original revision.');
        // Delete the second revision and check that the file is kept (since it is
        // still being used by the third revision).
        $this->drupalGet('node/' . $nid . '/revisions/' . $node_vid_r2 . '/delete');
        $this->submitForm([], 'Delete');
        $this->assertFileExists($node_file_r3->getFileUri());
        $this->assertFileEntryExists($node_file_r3, 'Second file entry is still available after deleting second revision, since it is being used by the third revision.');
        $this->assertFileIsPermanent($node_file_r3, 'Second file entry is still permanent after deleting second revision, since it is being used by the third revision.');
        // Attach the second file to a user.
        $user = $this->drupalCreateUser();
        $user->{$field_name}->target_id = $node_file_r3->id();
        $user->{$field_name}->display = 1;
        $user->save();
        $this->drupalGet('user/' . $user->id() . '/edit');
        // Delete the third revision and check that the file is not deleted yet.
        $this->drupalGet('node/' . $nid . '/revisions/' . $node_vid_r3 . '/delete');
        $this->submitForm([], 'Delete');
        $this->assertFileExists($node_file_r3->getFileUri());
        $this->assertFileEntryExists($node_file_r3, 'Second file entry is still available after deleting third revision, since it is being used by the user.');
        $this->assertFileIsPermanent($node_file_r3, 'Second file entry is still permanent after deleting third revision, since it is being used by the user.');
        // Delete the user and check that the file is also deleted.
        $user->delete();
        // Call file_cron() to clean up the file. Make sure the changed timestamp
        // of the file is older than the system.file.temporary_maximum_age
        // configuration value. We use an UPDATE statement because using the API
        // would set the timestamp.
        $connection = Database::getConnection();
        $connection->update('file_managed')
            ->fields([
            'changed' => \Drupal::time()->getRequestTime() - ($this->config('system.file')
                ->get('temporary_maximum_age') + 1),
        ])
            ->condition('fid', $node_file_r3->id())
            ->execute();
        \Drupal::service('cron')->run();
        $this->assertFileDoesNotExist($node_file_r3->getFileUri());
        $this->assertFileEntryNotExists($node_file_r3, 'Second file entry is now deleted after deleting third revision, since it is no longer being used by any other nodes.');
        // Delete the entire node and check that the original file is deleted.
        $this->drupalGet('node/' . $nid . '/delete');
        $this->submitForm([], 'Delete');
        // Call file_cron() to clean up the file. Make sure the changed timestamp
        // of the file is older than the system.file.temporary_maximum_age
        // configuration value. We use an UPDATE statement because using the API
        // would set the timestamp.
        $connection->update('file_managed')
            ->fields([
            'changed' => \Drupal::time()->getRequestTime() - ($this->config('system.file')
                ->get('temporary_maximum_age') + 1),
        ])
            ->condition('fid', $node_file_r1->id())
            ->execute();
        \Drupal::service('cron')->run();
        $this->assertFileDoesNotExist($node_file_r1->getFileUri());
        $this->assertFileEntryNotExists($node_file_r1, 'Original file entry is deleted after deleting the entire node with two revisions remaining.');
    }

}