class ContactFormEditForm

class ContactFormEditForm extends EntityForm implements ContainerInjectionInterface {
    use ConfigFormBaseTrait;
    
    /**
     * The email validator.
     *
     * @var \Drupal\Component\Utility\EmailValidatorInterface
     */
    protected $emailValidator;
    
    /**
     * The path validator.
     *
     * @var \Drupal\Core\Path\PathValidatorInterface
     */
    protected $pathValidator;
    
    /**
     * Constructs a new ContactFormEditForm.
     *
     * @param \Drupal\Component\Utility\EmailValidatorInterface $email_validator
     *   The email validator.
     * @param \Drupal\Core\Path\PathValidatorInterface $path_validator
     *   The path validator service.
     */
    public function __construct(EmailValidatorInterface $email_validator, PathValidatorInterface $path_validator) {
        $this->emailValidator = $email_validator;
        $this->pathValidator = $path_validator;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('email.validator'), $container->get('path.validator'));
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getEditableConfigNames() {
        return [
            'contact.settings',
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function form(array $form, FormStateInterface $form_state) {
        $form = parent::form($form, $form_state);
        $contact_form = $this->entity;
        $default_form = $this->config('contact.settings')
            ->get('default_form');
        $form['label'] = [
            '#type' => 'textfield',
            '#title' => $this->t('Label'),
            '#maxlength' => 255,
            '#default_value' => $contact_form->label(),
            '#description' => $this->t("Example: 'website feedback' or 'product information'."),
            '#required' => TRUE,
        ];
        $form['id'] = [
            '#type' => 'machine_name',
            '#default_value' => $contact_form->id(),
            '#maxlength' => EntityTypeInterface::BUNDLE_MAX_LENGTH,
            '#machine_name' => [
                'exists' => '\\Drupal\\contact\\Entity\\ContactForm::load',
            ],
            '#disabled' => !$contact_form->isNew(),
        ];
        $form['recipients'] = [
            '#type' => 'textarea',
            '#title' => $this->t('Recipients'),
            '#default_value' => implode(', ', $contact_form->getRecipients()),
            '#description' => $this->t("Example: 'webmaster@example.com' or 'sales@example.com,support@example.com' . To specify multiple recipients, separate each email address with a comma."),
            '#required' => TRUE,
        ];
        $form['message'] = [
            '#type' => 'textarea',
            '#title' => $this->t('Message'),
            '#default_value' => $contact_form->getMessage(),
            '#description' => $this->t('The message to display to the user after submission of this form. Leave blank for no message.'),
        ];
        $form['redirect'] = [
            '#type' => 'path',
            '#title' => $this->t('Redirect path'),
            '#convert_path' => PathElement::CONVERT_NONE,
            '#default_value' => $contact_form->getRedirectPath(),
            '#description' => $this->t('Path to redirect the user to after submission of this form. For example, type "/about" to redirect to that page. Use a relative path with a slash in front.'),
        ];
        $form['reply'] = [
            '#type' => 'textarea',
            '#title' => $this->t('Auto-reply'),
            '#default_value' => $contact_form->getReply(),
            '#description' => $this->t('Optional auto-reply. Leave empty if you do not want to send the user an auto-reply message.'),
        ];
        $form['weight'] = [
            '#type' => 'weight',
            '#title' => $this->t('Weight'),
            '#default_value' => $contact_form->getWeight(),
            '#description' => $this->t('When listing forms, those with lighter (smaller) weights get listed before forms with heavier (larger) weights. Forms with equal weights are sorted alphabetically.'),
        ];
        $form['selected'] = [
            '#type' => 'checkbox',
            '#title' => $this->t('Make this the default form'),
            '#default_value' => $default_form === $contact_form->id(),
        ];
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function validateForm(array &$form, FormStateInterface $form_state) {
        parent::validateForm($form, $form_state);
        // Validate and each email recipient.
        $recipients = explode(',', $form_state->getValue('recipients'));
        foreach ($recipients as &$recipient) {
            $recipient = trim($recipient);
            if (!$this->emailValidator
                ->isValid($recipient)) {
                $form_state->setErrorByName('recipients', $this->t('%recipient is an invalid email address.', [
                    '%recipient' => $recipient,
                ]));
            }
        }
        $form_state->setValue('recipients', $recipients);
        $redirect_url = $form_state->getValue('redirect');
        if ($redirect_url && $this->pathValidator
            ->isValid($redirect_url)) {
            if (mb_substr($redirect_url, 0, 1) !== '/') {
                $form_state->setErrorByName('redirect', $this->t('The path should start with /.'));
            }
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function save(array $form, FormStateInterface $form_state) {
        $contact_form = $this->entity;
        $status = $contact_form->save();
        $contact_settings = $this->config('contact.settings');
        $edit_link = $this->entity
            ->toLink($this->t('Edit'))
            ->toString();
        $view_link = $contact_form->toLink($contact_form->label(), 'canonical')
            ->toString();
        if ($status == SAVED_UPDATED) {
            $this->messenger()
                ->addStatus($this->t('Contact form %label has been updated.', [
                '%label' => $view_link,
            ]));
            $this->logger('contact')
                ->notice('Contact form %label has been updated.', [
                '%label' => $contact_form->label(),
                'link' => $edit_link,
            ]);
        }
        else {
            $this->messenger()
                ->addStatus($this->t('Contact form %label has been added.', [
                '%label' => $view_link,
            ]));
            $this->logger('contact')
                ->notice('Contact form %label has been added.', [
                '%label' => $contact_form->label(),
                'link' => $edit_link,
            ]);
        }
        // Update the default form.
        if ($form_state->getValue('selected')) {
            $contact_settings->set('default_form', $contact_form->id())
                ->save();
        }
        elseif ($contact_settings->get('default_form') == $contact_form->id()) {
            $contact_settings->set('default_form', NULL)
                ->save();
        }
        $form_state->setRedirectUrl($contact_form->toUrl('collection'));
    }

}