class PagePreviewTest

class PagePreviewTest extends NodeTestBase {
    use EntityReferenceTestTrait;
    use CommentTestTrait;
    use TestFileCreationTrait {
        getTestFiles as drupalGetTestFiles;
    }
    
    /**
     * Enable the comment, node and taxonomy modules to test on the preview.
     *
     * @var array
     */
    public static $modules = [
        'node',
        'taxonomy',
        'comment',
        'image',
        'file',
        'text',
        'node_test',
        'menu_ui',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'classy';
    
    /**
     * The name of the created field.
     *
     * @var string
     */
    protected $fieldName;
    protected function setUp() {
        parent::setUp();
        $this->addDefaultCommentField('node', 'page');
        $web_user = $this->drupalCreateUser([
            'edit own page content',
            'create page content',
            'administer menu',
        ]);
        $this->drupalLogin($web_user);
        // Add a vocabulary so we can test different view modes.
        $vocabulary = Vocabulary::create([
            'name' => $this->randomMachineName(),
            'description' => $this->randomMachineName(),
            'vid' => $this->randomMachineName(),
            'langcode' => LanguageInterface::LANGCODE_NOT_SPECIFIED,
            'help' => '',
        ]);
        $vocabulary->save();
        $this->vocabulary = $vocabulary;
        // Add a term to the vocabulary.
        $term = Term::create([
            'name' => $this->randomMachineName(),
            'description' => $this->randomMachineName(),
            'vid' => $this->vocabulary
                ->id(),
            'langcode' => LanguageInterface::LANGCODE_NOT_SPECIFIED,
        ]);
        $term->save();
        $this->term = $term;
        // Create an image field.
        FieldStorageConfig::create([
            'field_name' => 'field_image',
            'entity_type' => 'node',
            'type' => 'image',
            'settings' => [],
            'cardinality' => FieldStorageConfig::CARDINALITY_UNLIMITED,
        ])->save();
        $field_config = FieldConfig::create([
            'field_name' => 'field_image',
            'label' => 'Images',
            'entity_type' => 'node',
            'bundle' => 'page',
            'required' => FALSE,
            'settings' => [],
        ]);
        $field_config->save();
        // Create a field.
        $this->fieldName = mb_strtolower($this->randomMachineName());
        $handler_settings = [
            'target_bundles' => [
                $this->vocabulary
                    ->id() => $this->vocabulary
                    ->id(),
            ],
            'auto_create' => TRUE,
        ];
        $this->createEntityReferenceField('node', 'page', $this->fieldName, 'Tags', 'taxonomy_term', 'default', $handler_settings, FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED);
        
        /** @var \Drupal\Core\Entity\EntityDisplayRepositoryInterface $display_repository */
        $display_repository = \Drupal::service('entity_display.repository');
        $display_repository->getFormDisplay('node', 'page')
            ->setComponent($this->fieldName, [
            'type' => 'entity_reference_autocomplete_tags',
        ])
            ->save();
        // Show on default display and teaser.
        $display_repository->getViewDisplay('node', 'page')
            ->setComponent($this->fieldName, [
            'type' => 'entity_reference_label',
        ])
            ->save();
        $display_repository->getViewDisplay('node', 'page', 'teaser')
            ->setComponent($this->fieldName, [
            'type' => 'entity_reference_label',
        ])
            ->save();
        $display_repository->getFormDisplay('node', 'page')
            ->setComponent('field_image', [
            'type' => 'image_image',
            'settings' => [],
        ])
            ->save();
        $display_repository->getViewDisplay('node', 'page')
            ->setComponent('field_image')
            ->save();
        // Create a multi-value text field.
        $field_storage = FieldStorageConfig::create([
            'field_name' => 'field_test_multi',
            'entity_type' => 'node',
            'cardinality' => FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED,
            'type' => 'text',
            'settings' => [
                'max_length' => 50,
            ],
        ]);
        $field_storage->save();
        FieldConfig::create([
            'field_storage' => $field_storage,
            'bundle' => 'page',
        ])->save();
        $display_repository->getFormDisplay('node', 'page')
            ->setComponent('field_test_multi', [
            'type' => 'text_textfield',
        ])
            ->save();
        $display_repository->getViewDisplay('node', 'page')
            ->setComponent('field_test_multi', [
            'type' => 'string',
        ])
            ->save();
    }
    
    /**
     * Checks the node preview functionality.
     */
    public function testPagePreview() {
        $title_key = 'title[0][value]';
        $body_key = 'body[0][value]';
        $term_key = $this->fieldName . '[target_id]';
        // Fill in node creation form and preview node.
        $edit = [];
        $edit[$title_key] = '<em>' . $this->randomMachineName(8) . '</em>';
        $edit[$body_key] = $this->randomMachineName(16);
        $edit[$term_key] = $this->term
            ->getName();
        // Upload an image.
        $test_image = current($this->drupalGetTestFiles('image', 39325));
        $edit['files[field_image_0][]'] = \Drupal::service('file_system')->realpath($test_image->uri);
        $this->drupalPostForm('node/add/page', $edit, t('Upload'));
        // Add an alt tag and preview the node.
        $this->drupalPostForm(NULL, [
            'field_image[0][alt]' => 'Picture of llamas',
        ], t('Preview'));
        // Check that the preview is displaying the title, body and term.
        $expected_title = $edit[$title_key] . ' | Drupal';
        $this->assertSession()
            ->titleEquals($expected_title);
        $this->assertEscaped($edit[$title_key]);
        $this->assertText($edit[$body_key], 'Body displayed.');
        $this->assertText($edit[$term_key], 'Term displayed.');
        $this->assertSession()
            ->linkExists(t('Back to content editing'));
        // Check that we see the class of the node type on the body element.
        $body_class_element = $this->xpath("//body[contains(@class, 'page-node-type-page')]");
        $this->assertTrue(!empty($body_class_element), 'Node type body class found.');
        // Get the UUID.
        $url = parse_url($this->getUrl());
        $paths = explode('/', $url['path']);
        $view_mode = array_pop($paths);
        $uuid = array_pop($paths);
        // Switch view mode. We'll remove the body from the teaser view mode.
        \Drupal::service('entity_display.repository')->getViewDisplay('node', 'page', 'teaser')
            ->removeComponent('body')
            ->save();
        $view_mode_edit = [
            'view_mode' => 'teaser',
        ];
        $this->drupalPostForm('node/preview/' . $uuid . '/full', $view_mode_edit, t('Switch'));
        $this->assertRaw('view-mode-teaser', 'View mode teaser class found.');
        $this->assertNoText($edit[$body_key], 'Body not displayed.');
        // Check that the title, body and term fields are displayed with the
        // values after going back to the content edit page.
        $this->clickLink(t('Back to content editing'));
        $this->assertFieldByName($title_key, $edit[$title_key], 'Title field displayed.');
        $this->assertFieldByName($body_key, $edit[$body_key], 'Body field displayed.');
        $this->assertFieldByName($term_key, $edit[$term_key], 'Term field displayed.');
        $this->assertFieldByName('field_image[0][alt]', 'Picture of llamas');
        $this->getSession()
            ->getPage()
            ->pressButton('Add another item');
        $this->assertFieldByName('field_test_multi[0][value]');
        $this->assertFieldByName('field_test_multi[1][value]');
        // Return to page preview to check everything is as expected.
        $this->drupalPostForm(NULL, [], t('Preview'));
        $this->assertSession()
            ->titleEquals($expected_title);
        $this->assertEscaped($edit[$title_key]);
        $this->assertText($edit[$body_key], 'Body displayed.');
        $this->assertText($edit[$term_key], 'Term displayed.');
        $this->assertSession()
            ->linkExists(t('Back to content editing'));
        // Assert the content is kept when reloading the page.
        $this->drupalGet('node/add/page', [
            'query' => [
                'uuid' => $uuid,
            ],
        ]);
        $this->assertFieldByName($title_key, $edit[$title_key], 'Title field displayed.');
        $this->assertFieldByName($body_key, $edit[$body_key], 'Body field displayed.');
        $this->assertFieldByName($term_key, $edit[$term_key], 'Term field displayed.');
        // Save the node - this is a new POST, so we need to upload the image.
        $this->drupalPostForm('node/add/page', $edit, t('Upload'));
        $this->drupalPostForm(NULL, [
            'field_image[0][alt]' => 'Picture of llamas',
        ], t('Save'));
        $node = $this->drupalGetNodeByTitle($edit[$title_key]);
        // Check the term was displayed on the saved node.
        $this->drupalGet('node/' . $node->id());
        $this->assertText($edit[$term_key], 'Term displayed.');
        // Check the term appears again on the edit form.
        $this->drupalGet('node/' . $node->id() . '/edit');
        $this->assertFieldByName($term_key, $edit[$term_key] . ' (' . $this->term
            ->id() . ')', 'Term field displayed.');
        // Check with two new terms on the edit form, additionally to the existing
        // one.
        $edit = [];
        $newterm1 = $this->randomMachineName(8);
        $newterm2 = $this->randomMachineName(8);
        $edit[$term_key] = $this->term
            ->getName() . ', ' . $newterm1 . ', ' . $newterm2;
        $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Preview'));
        $this->assertRaw('>' . $newterm1 . '<', 'First new term displayed.');
        $this->assertRaw('>' . $newterm2 . '<', 'Second new term displayed.');
        // The first term should be displayed as link, the others not.
        $this->assertSession()
            ->linkExists($this->term
            ->getName());
        $this->assertSession()
            ->linkNotExists($newterm1);
        $this->assertSession()
            ->linkNotExists($newterm2);
        $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Save'));
        // Check with one more new term, keeping old terms, removing the existing
        // one.
        $edit = [];
        $newterm3 = $this->randomMachineName(8);
        $edit[$term_key] = $newterm1 . ', ' . $newterm3 . ', ' . $newterm2;
        $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Preview'));
        $this->assertRaw('>' . $newterm1 . '<', 'First existing term displayed.');
        $this->assertRaw('>' . $newterm2 . '<', 'Second existing term displayed.');
        $this->assertRaw('>' . $newterm3 . '<', 'Third new term displayed.');
        $this->assertNoText($this->term
            ->getName());
        $this->assertSession()
            ->linkExists($newterm1);
        $this->assertSession()
            ->linkExists($newterm2);
        $this->assertSession()
            ->linkNotExists($newterm3);
        // Check that editing an existing node after it has been previewed and not
        // saved doesn't remember the previous changes.
        $edit = [
            $title_key => $this->randomMachineName(8),
        ];
        $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Preview'));
        $this->assertText($edit[$title_key], 'New title displayed.');
        $this->clickLink(t('Back to content editing'));
        $this->assertFieldByName($title_key, $edit[$title_key], 'New title value displayed.');
        // Navigate away from the node without saving.
        $this->drupalGet('<front>');
        // Go back to the edit form, the title should have its initial value.
        $this->drupalGet('node/' . $node->id() . '/edit');
        $this->assertFieldByName($title_key, $node->label(), 'Correct title value displayed.');
        // Check with required preview.
        $node_type = NodeType::load('page');
        $node_type->setPreviewMode(DRUPAL_REQUIRED);
        $node_type->save();
        $this->drupalGet('node/add/page');
        $this->assertNoRaw('edit-submit');
        $this->drupalPostForm('node/add/page', [
            $title_key => 'Preview',
        ], t('Preview'));
        $this->clickLink(t('Back to content editing'));
        $this->assertRaw('edit-submit');
        // Check that destination is remembered when clicking on preview. When going
        // back to the edit form and clicking save, we should go back to the
        // original destination, if set.
        $destination = 'node';
        $this->drupalPostForm($node->toUrl('edit-form'), [], t('Preview'), [
            'query' => [
                'destination' => $destination,
            ],
        ]);
        $parameters = [
            'node_preview' => $node->uuid(),
            'view_mode_id' => 'full',
        ];
        $options = [
            'absolute' => TRUE,
            'query' => [
                'destination' => $destination,
            ],
        ];
        $this->assertUrl(Url::fromRoute('entity.node.preview', $parameters, $options));
        $this->drupalPostForm(NULL, [
            'view_mode' => 'teaser',
        ], t('Switch'));
        $this->clickLink(t('Back to content editing'));
        $this->drupalPostForm(NULL, [], t('Save'));
        $this->assertUrl($destination);
        // Check that preview page works as expected without a destination set.
        $this->drupalPostForm($node->toUrl('edit-form'), [], t('Preview'));
        $parameters = [
            'node_preview' => $node->uuid(),
            'view_mode_id' => 'full',
        ];
        $this->assertUrl(Url::fromRoute('entity.node.preview', $parameters, [
            'absolute' => TRUE,
        ]));
        $this->drupalPostForm(NULL, [
            'view_mode' => 'teaser',
        ], t('Switch'));
        $this->clickLink(t('Back to content editing'));
        $this->drupalPostForm(NULL, [], t('Save'));
        $this->assertUrl($node->toUrl());
        $this->assertSession()
            ->statusCodeEquals(200);
        
        /** @var \Drupal\Core\File\FileSystemInterface $file_system */
        $file_system = \Drupal::service('file_system');
        // Assert multiple items can be added and are not lost when previewing.
        $test_image_1 = current($this->drupalGetTestFiles('image', 39325));
        $edit_image_1['files[field_image_0][]'] = $file_system->realpath($test_image_1->uri);
        $test_image_2 = current($this->drupalGetTestFiles('image', 39325));
        $edit_image_2['files[field_image_1][]'] = $file_system->realpath($test_image_2->uri);
        $edit['field_image[0][alt]'] = 'Alt 1';
        $this->drupalPostForm('node/add/page', $edit_image_1, t('Upload'));
        $this->drupalPostForm(NULL, $edit, t('Preview'));
        $this->clickLink(t('Back to content editing'));
        $this->assertFieldByName('files[field_image_1][]');
        $this->drupalPostForm(NULL, $edit_image_2, t('Upload'));
        $this->assertNoFieldByName('files[field_image_1][]');
        $title = 'node_test_title';
        $example_text_1 = 'example_text_preview_1';
        $example_text_2 = 'example_text_preview_2';
        $example_text_3 = 'example_text_preview_3';
        $this->drupalGet('node/add/page');
        $edit = [
            'title[0][value]' => $title,
            'field_test_multi[0][value]' => $example_text_1,
        ];
        $this->assertRaw('Storage is not set');
        $this->drupalPostForm(NULL, $edit, t('Preview'));
        $this->clickLink(t('Back to content editing'));
        $this->assertRaw('Storage is set');
        $this->assertFieldByName('field_test_multi[0][value]');
        $this->drupalPostForm(NULL, [], t('Save'));
        $this->assertText('Basic page ' . $title . ' has been created.');
        $node = $this->drupalGetNodeByTitle($title);
        $this->drupalGet('node/' . $node->id() . '/edit');
        $this->getSession()
            ->getPage()
            ->pressButton('Add another item');
        $this->getSession()
            ->getPage()
            ->pressButton('Add another item');
        $edit = [
            'field_test_multi[1][value]' => $example_text_2,
            'field_test_multi[2][value]' => $example_text_3,
        ];
        $this->drupalPostForm(NULL, $edit, t('Preview'));
        $this->clickLink(t('Back to content editing'));
        $this->drupalPostForm(NULL, $edit, t('Preview'));
        $this->clickLink(t('Back to content editing'));
        $this->assertFieldByName('field_test_multi[0][value]', $example_text_1);
        $this->assertFieldByName('field_test_multi[1][value]', $example_text_2);
        $this->assertFieldByName('field_test_multi[2][value]', $example_text_3);
        // Now save the node and make sure all values got saved.
        $this->drupalPostForm(NULL, [], t('Save'));
        $this->assertText($example_text_1);
        $this->assertText($example_text_2);
        $this->assertText($example_text_3);
        // Edit again, change the menu_ui settings and click on preview.
        $this->drupalGet('node/' . $node->id() . '/edit');
        $edit = [
            'menu[enabled]' => TRUE,
            'menu[title]' => 'Changed title',
        ];
        $this->drupalPostForm(NULL, $edit, t('Preview'));
        $this->clickLink(t('Back to content editing'));
        $this->assertFieldChecked('edit-menu-enabled', 'Menu option is still checked');
        $this->assertFieldByName('menu[title]', 'Changed title', 'Menu link title is correct after preview');
        // Save, change the title while saving and make sure that it is correctly
        // saved.
        $edit = [
            'menu[enabled]' => TRUE,
            'menu[title]' => 'Second title change',
        ];
        $this->drupalPostForm(NULL, $edit, t('Save'));
        $this->drupalGet('node/' . $node->id() . '/edit');
        $this->assertFieldByName('menu[title]', 'Second title change', 'Menu link title is correct after saving');
    }
    
    /**
     * Checks the node preview functionality, when using revisions.
     */
    public function testPagePreviewWithRevisions() {
        $title_key = 'title[0][value]';
        $body_key = 'body[0][value]';
        $term_key = $this->fieldName . '[target_id]';
        // Force revision on "Basic page" content.
        $node_type = NodeType::load('page');
        $node_type->setNewRevision(TRUE);
        $node_type->save();
        // Fill in node creation form and preview node.
        $edit = [];
        $edit[$title_key] = $this->randomMachineName(8);
        $edit[$body_key] = $this->randomMachineName(16);
        $edit[$term_key] = $this->term
            ->id();
        $edit['revision_log[0][value]'] = $this->randomString(32);
        $this->drupalPostForm('node/add/page', $edit, t('Preview'));
        // Check that the preview is displaying the title, body and term.
        $this->assertTitle($edit[$title_key] . ' | Drupal');
        $this->assertText($edit[$title_key], 'Title displayed.');
        $this->assertText($edit[$body_key], 'Body displayed.');
        $this->assertText($edit[$term_key], 'Term displayed.');
        // Check that the title and body fields are displayed with the correct
        // values after going back to the content edit page.
        $this->clickLink(t('Back to content editing'));
        $this->assertFieldByName($title_key, $edit[$title_key], 'Title field displayed.');
        $this->assertFieldByName($body_key, $edit[$body_key], 'Body field displayed.');
        $this->assertFieldByName($term_key, $edit[$term_key], 'Term field displayed.');
        // Check that the revision log field has the correct value.
        $this->assertFieldByName('revision_log[0][value]', $edit['revision_log[0][value]'], 'Revision log field displayed.');
        // Save the node after coming back from the preview page so we can create a
        // pending revision for it.
        $this->drupalPostForm(NULL, [], t('Save'));
        $node = $this->drupalGetNodeByTitle($edit[$title_key]);
        // Check that previewing a pending revision of a node works. This can not be
        // accomplished through the UI so we have to use API calls.
        // @todo Change this test to use the UI when we will be able to create
        // pending revisions in core.
        // @see https://www.drupal.org/node/2725533
        $node->setNewRevision(TRUE);
        $node->isDefaultRevision(FALSE);
        
        /** @var \Drupal\Core\Controller\ControllerResolverInterface $controller_resolver */
        $controller_resolver = \Drupal::service('controller_resolver');
        $node_preview_controller = $controller_resolver->getControllerFromDefinition('\\Drupal\\node\\Controller\\NodePreviewController::view');
        $node_preview_controller($node, 'full');
    }
    
    /**
     * Checks the node preview accessible for simultaneous node editing.
     */
    public function testSimultaneousPreview() {
        $title_key = 'title[0][value]';
        $node = $this->drupalCreateNode([]);
        $edit = [
            $title_key => 'New page title',
        ];
        $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Preview'));
        $this->assertText($edit[$title_key]);
        $user2 = $this->drupalCreateUser([
            'edit any page content',
        ]);
        $this->drupalLogin($user2);
        $this->drupalGet('node/' . $node->id() . '/edit');
        $this->assertFieldByName($title_key, $node->label(), 'No title leaked from previous user.');
        $edit2 = [
            $title_key => 'Another page title',
        ];
        $this->drupalPostForm('node/' . $node->id() . '/edit', $edit2, t('Preview'));
        $this->assertUrl(Url::fromRoute('entity.node.preview', [
            'node_preview' => $node->uuid(),
            'view_mode_id' => 'full',
        ], [
            'absolute' => TRUE,
        ])
            ->toString());
        $this->assertText($edit2[$title_key]);
    }

}