class CommentTestBase

abstract class CommentTestBase extends BrowserTestBase {
    use CommentTestTrait;
    
    /**
     * Modules to install.
     *
     * @var array
     */
    protected static $modules = [
        'block',
        'comment',
        'node',
        'history',
        'field_ui',
        'datetime',
    ];
    
    /**
     * An administrative user with permission to configure comment settings.
     *
     * @var \Drupal\user\UserInterface
     */
    protected $adminUser;
    
    /**
     * A normal user with permission to post comments.
     *
     * @var \Drupal\user\UserInterface
     */
    protected $webUser;
    
    /**
     * A test node to which comments will be posted.
     *
     * @var \Drupal\node\NodeInterface
     */
    protected $node;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        // Create an article content type only if it does not yet exist, so that
        // child classes may specify the standard profile.
        $types = NodeType::loadMultiple();
        if (empty($types['article'])) {
            $this->drupalCreateContentType([
                'type' => 'article',
                'name' => t('Article'),
            ]);
        }
        // Create two test users.
        $this->adminUser = $this->drupalCreateUser([
            'administer content types',
            'administer comments',
            'administer comment types',
            'administer comment fields',
            'administer comment display',
            'skip comment approval',
            'post comments',
            'access comments',
            // Usernames aren't shown in comment edit form autocomplete unless this
            // permission is granted.
'access user profiles',
            'access content',
        ]);
        $this->webUser = $this->drupalCreateUser([
            'access comments',
            'post comments',
            'create article content',
            'edit own comments',
            'skip comment approval',
            'access content',
        ]);
        // Create comment field on article.
        $this->addDefaultCommentField('node', 'article');
        // Create a test node authored by the web user.
        $this->node = $this->drupalCreateNode([
            'type' => 'article',
            'promote' => 1,
            'uid' => $this->webUser
                ->id(),
        ]);
        $this->drupalPlaceBlock('local_tasks_block');
    }
    
    /**
     * Posts a comment.
     *
     * @param \Drupal\Core\Entity\EntityInterface|null $entity
     *   Node to post comment on or NULL to post to the previously loaded page.
     * @param string $comment
     *   Comment body.
     * @param string $subject
     *   Comment subject.
     * @param string $contact
     *   Set to NULL for no contact info, TRUE to ignore success checking, and
     *   array of values to set contact info.
     * @param string $field_name
     *   (optional) Field name through which the comment should be posted.
     *   Defaults to 'comment'.
     *
     * @return \Drupal\comment\CommentInterface|null
     *   The posted comment or NULL when posted comment was not found.
     */
    public function postComment($entity, $comment, $subject = '', $contact = NULL, $field_name = 'comment') {
        $edit = [];
        $edit['comment_body[0][value]'] = $comment;
        if ($entity !== NULL) {
            $field = FieldConfig::loadByName($entity->getEntityTypeId(), $entity->bundle(), $field_name);
        }
        else {
            $field = FieldConfig::loadByName('node', 'article', $field_name);
        }
        $preview_mode = $field->getSetting('preview');
        // Must get the page before we test for fields.
        if ($entity !== NULL) {
            $this->drupalGet('comment/reply/' . $entity->getEntityTypeId() . '/' . $entity->id() . '/' . $field_name);
        }
        // Determine the visibility of subject form field.
        $display_repository = $this->container
            ->get('entity_display.repository');
        if ($display_repository->getFormDisplay('comment', 'comment')
            ->getComponent('subject')) {
            // Subject input allowed.
            $edit['subject[0][value]'] = $subject;
        }
        else {
            $this->assertSession()
                ->fieldNotExists('subject[0][value]');
        }
        if ($contact !== NULL && is_array($contact)) {
            $edit += $contact;
        }
        switch ($preview_mode) {
            case DRUPAL_REQUIRED:
                // Preview required so no save button should be found.
                $this->assertSession()
                    ->buttonNotExists('Save');
                $this->submitForm($edit, 'Preview');
            // Don't break here so that we can test post-preview field presence and
            // function below.
            case DRUPAL_OPTIONAL:
                $this->assertSession()
                    ->buttonExists('Preview');
                $this->assertSession()
                    ->buttonExists('Save');
                $this->submitForm($edit, 'Save');
                break;
            case DRUPAL_DISABLED:
                $this->assertSession()
                    ->buttonNotExists('Preview');
                $this->assertSession()
                    ->buttonExists('Save');
                $this->submitForm($edit, 'Save');
                break;
        }
        $match = [];
        // Get comment ID
        preg_match('/#comment-([0-9]+)/', $this->getURL(), $match);
        // Get comment.
        if ($contact !== TRUE) {
            // If true then attempting to find error message.
            if ($subject) {
                $this->assertSession()
                    ->pageTextContains($subject);
            }
            $this->assertSession()
                ->pageTextContains($comment);
            // Check the comment ID was extracted.
            $this->assertArrayHasKey(1, $match);
        }
        if (isset($match[1])) {
            \Drupal::entityTypeManager()->getStorage('comment')
                ->resetCache([
                $match[1],
            ]);
            return Comment::load($match[1]);
        }
    }
    
    /**
     * Checks current page for specified comment.
     *
     * @param \Drupal\comment\CommentInterface $comment
     *   The comment object.
     * @param bool $reply
     *   Boolean indicating whether the comment is a reply to another comment.
     *
     * @return bool
     *   Boolean indicating whether the comment was found.
     */
    public function commentExists(CommentInterface $comment = NULL, $reply = FALSE) {
        if ($comment) {
            $comment_element = $this->cssSelect(($reply ? '.indented ' : '') . 'article#comment-' . $comment->id());
            if (empty($comment_element)) {
                return FALSE;
            }
            $comment_title = $comment_element[0]->find('xpath', 'div/h3/a');
            if (empty($comment_title) || $comment_title->getText() !== $comment->getSubject()) {
                return FALSE;
            }
            $comment_body = $comment_element[0]->find('xpath', 'div/div/p');
            if (empty($comment_body) || $comment_body->getText() !== $comment->comment_body->value) {
                return FALSE;
            }
            return TRUE;
        }
        else {
            return FALSE;
        }
    }
    
    /**
     * Deletes a comment.
     *
     * @param \Drupal\comment\CommentInterface $comment
     *   Comment to delete.
     */
    public function deleteComment(CommentInterface $comment) {
        $this->drupalGet('comment/' . $comment->id() . '/delete');
        $this->submitForm([], 'Delete');
        $this->assertSession()
            ->pageTextContains('The comment and all its replies have been deleted.');
    }
    
    /**
     * Sets the value governing whether the subject field should be enabled.
     *
     * @param bool $enabled
     *   Boolean specifying whether the subject field should be enabled.
     */
    public function setCommentSubject($enabled) {
        $form_display = $this->container
            ->get('entity_display.repository')
            ->getFormDisplay('comment', 'comment');
        if ($enabled) {
            $form_display->setComponent('subject', [
                'type' => 'string_textfield',
            ]);
        }
        else {
            $form_display->removeComponent('subject');
        }
        $form_display->save();
    }
    
    /**
     * Sets the value governing the previewing mode for the comment form.
     *
     * @param int $mode
     *   The preview mode: DRUPAL_DISABLED, DRUPAL_OPTIONAL or DRUPAL_REQUIRED.
     * @param string $field_name
     *   (optional) Field name through which the comment should be posted.
     *   Defaults to 'comment'.
     */
    public function setCommentPreview($mode, $field_name = 'comment') {
        switch ($mode) {
            case DRUPAL_DISABLED:
                $mode_text = 'disabled';
                break;
            case DRUPAL_OPTIONAL:
                $mode_text = 'optional';
                break;
            case DRUPAL_REQUIRED:
                $mode_text = 'required';
                break;
        }
        $this->setCommentSettings('preview', $mode, new FormattableMarkup('Comment preview @mode_text.', [
            '@mode_text' => $mode_text,
        ]), $field_name);
    }
    
    /**
     * Sets the value governing whether the comment form is on its own page.
     *
     * @param bool $enabled
     *   TRUE if the comment form should be displayed on the same page as the
     *   comments; FALSE if it should be displayed on its own page.
     * @param string $field_name
     *   (optional) Field name through which the comment should be posted.
     *   Defaults to 'comment'.
     */
    public function setCommentForm($enabled, $field_name = 'comment') {
        $this->setCommentSettings('form_location', $enabled ? CommentItemInterface::FORM_BELOW : CommentItemInterface::FORM_SEPARATE_PAGE, 'Comment controls ' . ($enabled ? 'enabled' : 'disabled') . '.', $field_name);
    }
    
    /**
     * Sets the value governing restrictions on anonymous comments.
     *
     * @param int $level
     *   The level of the contact information allowed for anonymous comments:
     *   - 0: No contact information allowed.
     *   - 1: Contact information allowed but not required.
     *   - 2: Contact information required.
     */
    public function setCommentAnonymous($level) {
        $this->setCommentSettings('anonymous', $level, new FormattableMarkup('Anonymous commenting set to level @level.', [
            '@level' => $level,
        ]));
    }
    
    /**
     * Sets the value specifying the default number of comments per page.
     *
     * @param int $number
     *   Comments per page value.
     * @param string $field_name
     *   (optional) Field name through which the comment should be posted.
     *   Defaults to 'comment'.
     */
    public function setCommentsPerPage($number, $field_name = 'comment') {
        $this->setCommentSettings('per_page', $number, new FormattableMarkup('Number of comments per page set to @number.', [
            '@number' => $number,
        ]), $field_name);
    }
    
    /**
     * Sets a comment settings variable for the article content type.
     *
     * @param string $name
     *   Name of variable.
     * @param string $value
     *   Value of variable.
     * @param string $message
     *   Status message to display.
     * @param string $field_name
     *   (optional) Field name through which the comment should be posted.
     *   Defaults to 'comment'.
     */
    public function setCommentSettings($name, $value, $message, $field_name = 'comment') {
        $field = FieldConfig::loadByName('node', 'article', $field_name);
        $field->setSetting($name, $value);
        $field->save();
    }
    
    /**
     * Checks whether the commenter's contact information is displayed.
     *
     * @return bool
     *   Contact info is available.
     */
    public function commentContactInfoAvailable() {
        return (bool) preg_match('/(input).*?(name="name").*?(input).*?(name="mail").*?(input).*?(name="homepage")/s', $this->getSession()
            ->getPage()
            ->getContent());
    }
    
    /**
     * Performs the specified operation on the specified comment.
     *
     * @param \Drupal\comment\CommentInterface $comment
     *   Comment to perform operation on.
     * @param string $operation
     *   Operation to perform.
     * @param bool $approval
     *   Operation is found on approval page.
     */
    public function performCommentOperation(CommentInterface $comment, $operation, $approval = FALSE) {
        $edit = [];
        $edit['operation'] = $operation;
        $edit['comments[' . $comment->id() . ']'] = TRUE;
        $this->drupalGet('admin/content/comment' . ($approval ? '/approval' : ''));
        $this->submitForm($edit, 'Update');
        if ($operation == 'delete') {
            $this->submitForm([], 'Delete');
            $this->assertSession()
                ->pageTextContains('Deleted 1 comment.');
        }
        else {
            $this->assertSession()
                ->pageTextContains('The update has been performed.');
        }
    }
    
    /**
     * Gets the comment ID for an unapproved comment.
     *
     * @param string $subject
     *   Comment subject to find.
     *
     * @return int
     *   Comment id.
     */
    public function getUnapprovedComment($subject) {
        $this->drupalGet('admin/content/comment/approval');
        preg_match('/href="(.*?)#comment-([^"]+)"(.*?)>(' . $subject . ')/', $this->getSession()
            ->getPage()
            ->getContent(), $match);
        return $match[2];
    }
    
    /**
     * Creates a comment type (bundle).
     *
     * @param string $label
     *   The comment type label.
     *
     * @return \Drupal\comment\Entity\CommentType
     *   Created comment type.
     */
    protected function createCommentType($label) {
        $bundle = CommentType::create([
            'id' => $label,
            'label' => $label,
            'description' => '',
            'target_entity_type_id' => 'node',
        ]);
        $bundle->save();
        return $bundle;
    }

}