GLM 5.2 (paid)

<?php

declare(strict_types=1);

namespace Drupal\current_date\Plugin\Block;

use Drupal\Core\Block\Attribute\Block;
use Drupal\Core\Block\BlockBase;
use Drupal\Core\Datetime\DateFormatterInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides a block that displays the current date.
 */
#[Block(
  id: 'current_date_block',
  admin_label: new TranslatableMarkup('Current date'),
  category: new TranslatableMarkup('Custom'),
)]
class CurrentDateBlock extends BlockBase implements ContainerFactoryPluginInterface {

  /**
   * The available predefined date format types.
   */
  protected const FORMAT_TYPES = [
    'short' => 'Short',
    'medium' => 'Medium',
    'long' => 'Long',
    'custom' => 'Custom',
  ];

  public function __construct(
    array $configuration,
    $plugin_id,
    $plugin_definition,
    protected DateFormatterInterface $dateFormatter,
  ) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition): static {
    return new static(
      $configuration,
      $plugin_id,
      $plugin_definition,
      $container->get('date.formatter'),
    );
  }

  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration(): array {
    return [
      'date_format_type' => 'medium',
      'custom_format' => 'd.m.Y',
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function blockForm($form, FormStateInterface $form_state): array {
    $config = $this->getConfiguration();

    $form['date_format_type'] = [
      '#type' => 'select',
      '#title' => $this->t('Date format'),
      '#description' => $this->t('Choose a predefined date format or "Custom" to enter your own PHP date format string.'),
      '#options' => array_map([$this, 't'], self::FORMAT_TYPES),
      '#default_value' => $config['date_format_type'],
    ];

    $form['custom_format'] = [
      '#type' => 'textfield',
      '#title' => $this->t('Custom date format'),
      '#description' => $this->t('A PHP date format string (e.g. <em>d.m.Y</em>, <em>Y-m-d H:i</em>). Used only when "Custom" format is selected. See the <a href=":url">PHP manual</a> for available placeholders.', [':url' => 'https://www.php.net/manual/datetime.format.php']),
      '#default_value' => $config['custom_format'],
      '#states' => [
        'visible' => [
          ':input[name="settings[date_format_type]"]' => ['value' => 'custom'],
        ],
      ],
    ];

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function blockSubmit($form, FormStateInterface $form_state): void {
    $this->configuration['date_format_type'] = $form_state->getValue('date_format_type');
    $this->configuration['custom_format'] = $form_state->getValue('custom_format');
  }

  /**
   * {@inheritdoc}
   */
  public function blockValidate($form, FormStateInterface $form_state): void {
    if ($form_state->getValue('date_format_type') === 'custom' && trim((string) $form_state->getValue('custom_format')) === '') {
      $form_state->setErrorByName('custom_format', $this->t('A custom date format string is required when "Custom" format is selected.'));
    }
  }

  /**
   * {@inheritdoc}
   */
  public function build(): array {
    $config = $this->getConfiguration();
    $type = $config['date_format_type'];
    $format = $type === 'custom' ? $config['custom_format'] : '';

    $formatted = $this->dateFormatter->format(
      \Drupal::time()->getRequestTime(),
      $type === 'custom' ? 'custom' : $type,
      $format,
    );

    return [
      '#theme' => 'current_date',
      '#date' => $formatted,
      '#cache' => [
        'max-age' => 0,
      ],
    ];
  }

}