trait DateRecurModularWidgetFieldsTrait in Recurring Date Field Modular Widgets 8

trait DateRecurModularWidgetFieldsTrait {

  /**
   * Get a time zone element.
   *
   * @param string|null $timeZone
   *   Optional default time zone for which default value is derived.
   *
   * @return array
   *   A render array.
   */
  protected function getFieldTimeZone(?string $timeZone) : array {

    // Saved values (should) always have a time zone.
    $zones = $this
      ->getTimeZoneOptions();
    return [
      '#type' => 'select',
      '#title' => $this
        ->t('Time zone'),
      '#default_value' => $timeZone,
      '#options' => $zones,
    ];
  }

  /**
   * Get a BYMONTH element.
   *
   * @param \Drupal\date_recur\DateRecurRuleInterface|null $rule
   *   Optional rule for which default value is derived.
   *
   * @return array
   *   A render array.
   */
  protected function getFieldMonth(?DateRecurRuleInterface $rule) : array {
    $parts = $rule ? $rule
      ->getParts() : [];
    $monthOptions = DateHelper::monthNames(TRUE);
    $monthDefault = isset($parts['BYMONTH']) ? explode(',', $parts['BYMONTH']) : [];
    return [
      '#type' => 'checkboxes',
      '#title' => $this
        ->t('Months'),
      '#title_display' => 'invisible',
      '#options' => $monthOptions,
      '#default_value' => $monthDefault,
    ];
  }

  /**
   * Get a BYDAY element.
   *
   * @param \Drupal\date_recur\DateRecurRuleInterface|null $rule
   *   Optional rule for which default value is derived.
   * @param string $weekDayLabels
   *   Specify length of weekday labels. Possible values:
   *     - 'full': Full weekday label.
   *     - 'abbreviated': Three character weekday label.
   *
   * @return array
   *   A render array.
   */
  protected function getFieldByDay(?DateRecurRuleInterface $rule, string $weekDayLabels = 'full') : array {
    assert($this->configFactory instanceof ConfigFactoryInterface);
    $parts = $rule ? $rule
      ->getParts() : [];
    $weekdaysKeys = [
      'SU',
      'MO',
      'TU',
      'WE',
      'TH',
      'FR',
      'SA',
    ];
    $weekdayLabels = $weekDayLabels === 'full' ? DateHelper::weekDays(TRUE) : ($weekDayLabels === 'abbreviated' ? DateHelper::weekDaysAbbr(TRUE) : []);
    $weekdays = array_combine($weekdaysKeys, $weekdayLabels);

    // Weekday int. 0-6 (Sun-Sat).
    $firstDayInt = $this->configFactory
      ->get('system.date')
      ->get('first_day');

    // Rebuild weekday options where system first day is first option in list.
    $weekdayOptions = array_merge(array_slice($weekdays, $firstDayInt), array_slice($weekdays, 0, $firstDayInt));
    $weekDayDefault = isset($parts['BYDAY']) ? explode(',', $parts['BYDAY']) : [];
    return [
      '#type' => 'checkboxes',
      '#title_display' => 'invisible',
      '#title' => $this
        ->t('Weekdays'),
      '#options' => $weekdayOptions,
      '#default_value' => $weekDayDefault,
    ];
  }

  /**
   * Get a select element for toggling between common modes.
   *
   * Modes roughly equate to frequencies.
   *
   * @param \Drupal\date_recur\Plugin\Field\FieldType\DateRecurItem $item
   *   A date recur field item.
   *
   * @return array
   *   A render array.
   */
  protected function getFieldMode(DateRecurItem $item) : array {
    $modes = $this
      ->getModes();
    return [
      '#type' => 'select',
      '#title' => $this
        ->t('Mode'),
      '#options' => $modes,
      '#default_value' => $this
        ->getMode($item),
      '#access' => count($modes) > 0,
    ];
  }

  /**
   * Get an radios element for toggling between common end modes.
   *
   * @return array
   *   A render array.
   */
  protected function getFieldEndsMode() : array {
    return [
      '#type' => 'radios',
      '#title' => $this
        ->t('Ends'),
      '#options' => [
        DateRecurModularWidgetOptions::ENDS_MODE_INFINITE => $this
          ->t('Never'),
        DateRecurModularWidgetOptions::ENDS_MODE_OCCURRENCES => $this
          ->t('After number of occurrences'),
        DateRecurModularWidgetOptions::ENDS_MODE_ON_DATE => $this
          ->t('On date'),
      ],
    ];
  }

  /**
   * Builds a #states array for an element dependant on mode selected.
   *
   * @param array $element
   *   The element currently built.
   * @param array $modes
   *   An array of modes which allow an element to be visible.
   *
   * @return array
   *   An array suitable for assignment to a form API '#states' key.
   */
  protected function getVisibilityStates(array $element, array $modes) : array {
    $modeFieldName = $this
      ->getName($element, [
      'mode',
    ]);
    $conditions = [];
    foreach ($modes as $mode) {
      if (count($conditions) > 0) {
        $conditions[] = 'or';
      }
      $conditions[] = [
        ':input[name="' . $modeFieldName . '"]' => [
          'value' => $mode,
        ],
      ];
    }
    return [
      'visible' => $conditions,
    ];
  }

}