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<?php

namespace Drupal\datetime_range\Plugin\Field\FieldFormatter;

use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\datetime\Plugin\Field\FieldFormatter\DateTimePlainFormatter;
use Drupal\datetime_range\DateTimeRangeTrait;

/**
 * Plugin implementation of the 'Plain' formatter for 'daterange' fields.
 *
 * This formatter renders the data range as a plain text string, with a
 * configurable separator using an ISO-like date format string.
 *
 * @FieldFormatter(
 *   id = "daterange_plain",
 *   label = @Translation("Plain"),
 *   field_types = {
 *     "daterange"
 *   }
 * )
 */
class DateRangePlainFormatter extends DateTimePlainFormatter {

  use DateTimeRangeTrait;

  /**
   * {@inheritdoc}
   */
  public static function defaultSettings() {
    return [
      'separator' => '-',
    ] + parent::defaultSettings();
  }

  /**
   * {@inheritdoc}
   */
  public function viewElements(FieldItemListInterface $items, $langcode) {
    $elements = [];
    $separator = $this->getSetting('separator');

    foreach ($items as $delta => $item) {
      if (!empty($item->start_date) && !empty($item->end_date)) {
        /** @var \Drupal\Core\Datetime\DrupalDateTime $start_date */
        $start_date = $item->start_date;
        /** @var \Drupal\Core\Datetime\DrupalDateTime $end_date */
        $end_date = $item->end_date;

        if ($start_date->getTimestamp() !== $end_date->getTimestamp()) {
          $elements[$delta] = [
            'start_date' => $this->buildDate($start_date),
            'separator' => ['#plain_text' => ' ' . $separator . ' '],
            'end_date' => $this->buildDate($end_date),
          ];
        }
        else {
          $elements[$delta] = $this->buildDate($start_date);
        }
      }
    }

    return $elements;
  }

  /**
   * {@inheritdoc}
   */
  public function settingsForm(array $form, FormStateInterface $form_state) {
    $form = parent::settingsForm($form, $form_state);

    $form['separator'] = [
      '#type' => 'textfield',
      '#title' => $this->t('Date separator'),
      '#description' => $this->t('The string to separate the start and end dates'),
      '#default_value' => $this->getSetting('separator'),
    ];

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function settingsSummary() {
    $summary = parent::settingsSummary();

    if ($separator = $this->getSetting('separator')) {
      $summary[] = $this->t('Separator: %separator', ['%separator' => $separator]);
    }

    return $summary;
  }

}
 ?>