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<?php

namespace Drupal\form_test;

use Drupal\Core\Form\FormStateInterface;

/**
 * Simple class for testing methods as Form API callbacks.
 */
class Callbacks {

  /**
   * Form element validation handler for 'name' in form_test_validate_form().
   */
  public function validateName(&$element, FormStateInterface $form_state) {
    $triggered = FALSE;
    if ($form_state->getValue('name') == 'element_validate') {
      // Alter the form element.
      $element['#value'] = '#value changed by #element_validate';
      // Alter the submitted value in $form_state.
      $form_state->setValueForElement($element, 'value changed by setValueForElement() in #element_validate');

      $triggered = TRUE;
    }
    if ($form_state->getValue('name') == 'element_validate_access') {
      $form_state->set('form_test_name', $form_state->getValue('name'));
      // Alter the form element.
      $element['#access'] = FALSE;

      $triggered = TRUE;
    }
    elseif ($form_state->has('form_test_name')) {
      // To simplify this test, just take over the element's value into $form_state.
      $form_state->setValueForElement($element, $form_state->get('form_test_name'));

      $triggered = TRUE;
    }

    if ($triggered) {
      // Output the element's value from $form_state.
      \Drupal::messenger()->addStatus(t('@label value: @value', ['@label' => $element['#title'], '@value' => $form_state->getValue('name')]));

      // Trigger a form validation error to see our changes.
      $form_state->setErrorByName('');
    }
  }

}