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<?php

namespace Drupal\contextual\Plugin\views\field;

use Drupal\Component\Serialization\Json;
use Drupal\Component\Utility\Html;
use Drupal\Component\Utility\UrlHelper;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Routing\RedirectDestinationTrait;
use Drupal\Core\Url;
use Drupal\views\Attribute\ViewsField;
use Drupal\views\Plugin\views\field\FieldPluginBase;
use Drupal\views\ResultRow;

/**
 * Provides a handler that adds contextual links.
 *
 * @ingroup views_field_handlers
 */
#[ViewsField("contextual_links")]
class ContextualLinks extends FieldPluginBase {

  use RedirectDestinationTrait;

  /**
   * {@inheritdoc}
   */
  public function usesGroupBy() {
    return FALSE;
  }

  /**
   * {@inheritdoc}
   */
  protected function defineOptions() {
    $options = parent::defineOptions();

    $options['fields'] = ['default' => []];
    $options['destination'] = ['default' => 1];

    return $options;
  }

  /**
   * {@inheritdoc}
   */
  public function buildOptionsForm(&$form, FormStateInterface $form_state) {
    $all_fields = $this->view->display_handler->getFieldLabels();
    // Offer to include only those fields that follow this one.
    $field_options = array_slice($all_fields, 0, array_search($this->options['id'], array_keys($all_fields)));
    $form['fields'] = [
      '#type' => 'checkboxes',
      '#title' => $this->t('Fields'),
      '#description' => $this->t('Fields to be included as contextual links.'),
      '#options' => $field_options,
      '#default_value' => $this->options['fields'],
    ];
    $form['destination'] = [
      '#type' => 'select',
      '#title' => $this->t('Include destination'),
      '#description' => $this->t('Include a "destination" parameter in the link to return the user to the original view upon completing the contextual action.'),
      '#options' => [
        '0' => $this->t('No'),
        '1' => $this->t('Yes'),
      ],
      '#default_value' => $this->options['destination'],
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function preRender(&$values) {
    // Add a row plugin css class for the contextual link.
    $class = 'contextual-region';
    if (!empty($this->view->style_plugin->options['row_class'])) {
      $this->view->style_plugin->options['row_class'] .= " $class";
    }
    else {
      $this->view->style_plugin->options['row_class'] = $class;
    }
  }

  /**
   * Overrides \Drupal\views\Plugin\views\field\FieldPluginBase::render().
   *
   * Renders the contextual fields.
   *
   * @param \Drupal\views\ResultRow $values
   *   The values retrieved from a single row of a view's query result.
   *
   * @see contextual_preprocess()
   * @see contextual_contextual_links_view_alter()
   */
  public function render(ResultRow $values) {
    $links = [];
    foreach ($this->options['fields'] as $field) {
      $rendered_field = $this->view->style_plugin->getField($values->index, $field);
      if (empty($rendered_field)) {
        continue;
      }
      $title = $this->view->field[$field]->last_render_text;
      $path = '';
      if (!empty($this->view->field[$field]->options['alter']['path'])) {
        $path = $this->view->field[$field]->options['alter']['path'];
      }
      elseif (!empty($this->view->field[$field]->options['alter']['url']) && $this->view->field[$field]->options['alter']['url'] instanceof Url) {
        $path = $this->view->field[$field]->options['alter']['url']->toString();
      }
      if (!empty($title) && !empty($path)) {
        // Make sure that tokens are replaced for this paths as well.
        $tokens = $this->getRenderTokens([]);
        $path = strip_tags(Html::decodeEntities(strtr($path, $tokens)));

        $links[$field] = [
          'href' => $path,
          'title' => $title,
        ];
        if (!empty($this->options['destination'])) {
          $links[$field]['query'] = $this->getDestinationArray();
        }
      }
    }

    // Renders a contextual links placeholder.
    if (!empty($links)) {
      $contextual_links = [
        'contextual' => [
          '',
          [],
          [
            'contextual-views-field-links' => UrlHelper::encodePath(Json::encode($links)),
          ],
        ],
      ];

      $element = [
        '#type' => 'contextual_links_placeholder',
        '#id' => _contextual_links_to_id($contextual_links),
      ];
      return \Drupal::service('renderer')->render($element);
    }
    else {
      return '';
    }
  }

  /**
   * {@inheritdoc}
   */
  public function query() {}

}