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<?php

namespace Drupal\webform\Plugin\WebformElement;

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Form\OptGroup;
use Drupal\webform\Utility\WebformArrayHelper;
use Drupal\webform\WebformSubmissionInterface;

/**
 * Provides a 'table' trait.
 */
trait WebformTableTrait {

  /**
   * {@inheritdoc}
   */
  public function prepare(array &$element, ?WebformSubmissionInterface $webform_submission = NULL) {
    parent::prepare($element, $webform_submission);

    // Add missing element class.
    $element['#attributes']['class'][] = str_replace('_', '-', $element['#type']);

    // If the #header is not specified, use the element's title as
    // the column header.
    if (!isset($element['#header'])) {
      if (empty($element['#title_display']) || $element['#title_display'] === 'header') {
        $element['#header'] = [['data' => static::buildElementTitle($element)]];
      }
      else {
        $element['#header'] = [''];
      }
    }

    // By default do not display the table element's title.
    if (empty($element['#title_display']) || $element['#title_display'] === 'header') {
      $element['#title_display'] = 'none';
    }

    // Convert associative array of options into one column row.
    if (isset($element['#options'])) {
      foreach ($element['#options'] as $options_key => $options_value) {
        if (is_string($options_value)) {
          $element['#options'][$options_key] = [
            ['value' => $options_value],
          ];
        }
      }
    }

    $element['#attached']['library'][] = 'webform/webform.element.' . $element['#type'];

    // Set table select element's #process callback so that fix UX
    // and accessibility issues.
    if ($this->getPluginId() === 'tableselect') {
      static::setProcessTableSelectCallback($element);
    }

    // Add form element theme wrapper.
    $element['#theme_wrappers'][] = 'form_element';
    $element['#label_attributes']['webform-remove-for-attribute'] = TRUE;
  }

  /**
   * {@inheritdoc}
   */
  public function setDefaultValue(array &$element) {
    if (isset($element['#default_value']) && is_array($element['#default_value'])) {
      $element['#default_value'] = array_combine($element['#default_value'], $element['#default_value']);
    }
  }

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

    $form['options']['js_select'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Select all'),
      '#description' => $this->t('If checked, a select all checkbox will be added to the header.'),
      '#return_value' => TRUE,
    ];

    $form['form']['display_container']['title_display']['#options'] = [
      'header' => $this->t('Header'),
    ] + $form['form']['display_container']['title_display']['#options'];

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  protected function getTableSelectElementSelectorOptions(array $element, $input_selector = '') {
    $title = $this->getAdminLabel($element) . ' [' . $this->getPluginLabel() . ']';
    $name = $element['#webform_key'];
    if ($this->hasMultipleValues($element)) {
      $selectors = [];
      foreach ($element['#options'] as $value => $text) {
        if (is_array($text)) {
          $text = $value;
        }
        $selectors[":input[name=\"{$name}[{$value}]$input_selector\"]"] = $text . ' [' . $this->t('Checkbox') . ']';
      }
      return [$title => $selectors];
    }
    else {
      return [":input[name=\"{$name}\"]" => $title];
    }
  }

  /**
   * {@inheritdoc}
   */
  public function getElementSelectorSourceValues(array $element) {
    if ($this->hasMultipleValues($element)) {
      return [];
    }

    $name = $element['#webform_key'];
    $options = OptGroup::flattenOptions($element['#options']);
    return [":input[name=\"{$name}\"]" => $options];
  }

  /**
   * Process table select and attach JavaScript.
   *
   * @param array $element
   *   An associative array containing the properties and children of
   *   the tableselect element.
   *
   * @return array
   *   The processed element.
   *
   * @see \Drupal\Core\Render\Element\Tableselect::processTableselect
   */
  public static function processTableSelect(array $element) {
    $element['#attributes']['class'][] = 'webform-tableselect';
    $element['#attributes']['class'][] = 'js-webform-tableselect';
    $element['#attached']['library'][] = 'webform/webform.element.tableselect';
    if (!empty($element['#required'])) {
      $element['#attributes']['class'][] = 'required';
    }
    $element['#attributes']['multiple'] = !empty($element['#multiple']);
    return $element;
  }

  /**
   * Process table selected options.
   *
   * @param array $element
   *   An associative array containing the properties and children of
   *   the tableselect element.
   *
   * @return array
   *   The processed element.
   *
   * @see \Drupal\Core\Render\Element\Tableselect::processTableselect
   */
  public static function processTableSelectOptions(array $element) {
    foreach ($element['#options'] as $key => $choice) {
      if (!isset($element[$key])) {
        continue;
      }

      // Add #title to the table's options.
      if (empty($element[$key]['#title'])) {
        if ($title = static::getTableSelectOptionTitle($choice)) {
          $element[$key]['#title'] = $title;
          $element[$key]['#title_display'] = 'invisible';
        }
      }

      // Suppress inline error messages from appearing below
      // checkboxes and radios.
      $element[$key]['#error_no_message'] = TRUE;

      // Add required attribute to table select radios.
      if (!empty($element['#required']) && empty($element['#multiple'])) {
        $element[$key]['#attributes']['required'] = TRUE;
      }
    }
    return $element;
  }

  /**
   * Set process table select element callbacks.
   *
   * @param array $element
   *   An associative array containing the properties and children of
   *   the table select element.
   *
   * @see \Drupal\Core\Render\Element\Tableselect::processTableselect
   */
  public static function setProcessTableSelectCallback(array &$element) {
    $class = get_called_class();
    $element['#process'] = [
      ['\Drupal\Core\Render\Element\Tableselect', 'processTableselect'],
      [$class , 'processTableSelect'],
      [$class , 'processTableSelectOptions'],
    ];
  }

  /**
   * Get table selection option title/text.
   *
   * Issue #2719453: Tableselect single radio button missing #title attribute
   * and is not accessible,
   *
   * @param array $option
   *   A table select option.
   *
   * @return string|\Drupal\Component\Render\MarkupInterface|null
   *   Table selection option title/text.
   *
   * @see https://www.drupal.org/project/drupal/issues/2719453
   */
  public static function getTableSelectOptionTitle(array $option) {
    if (is_array($option) && WebformArrayHelper::isAssociative($option)) {
      // Get first value from custom options.
      $title = reset($option);
      if (is_array($title)) {
        $title = \Drupal::service('renderer')->render($title);
      }
      return $title;
    }
    elseif (is_array($option) && !empty($option[0]['value'])) {
      // Get value from default options.
      // @see \Drupal\webform\Plugin\WebformElement\WebformTableTrait::prepare
      return $option[0]['value'];
    }
    else {
      return NULL;
    }
  }

  /**
   * Build an element's title with help.
   *
   * @param array $element
   *   An element.
   *
   * @return array
   *   A render array containing an element's title with help.
   */
  protected static function buildElementTitle(array $element) {
    $title = (!empty($element['#title'])) ? $element['#title'] : '';

    $help = (!empty($element['#help'])) ? [
      '#type' => 'webform_help',
      '#help' => $element['#help'],
      '#help_title' => $title,
    ] : NULL;
    $help_display = (!empty($element['#help_display'])) ? $element['#help_display'] : 'title_after';

    $build = [];
    if ($help && $help_display === 'title_before') {
      $build['help'] = $help;
    }
    $build['title'] = [
      '#markup' => $title,
    ];
    if (!empty($element['#required']) || !empty($element['#_required'])) {
      $build['title'] += [
        '#prefix' => '<span class="form-required">',
        '#suffix' => '</span>',
      ];
    }
    if ($help && $help_display === 'title_after') {
      $build['help'] = $help;
    }
    return $build;
  }

}