class RulesReactionListBuilder

class RulesReactionListBuilder extends ConfigEntityListBuilder {
    
    /**
     * The Rules event plugin manager.
     *
     * @var \Drupal\Core\RulesEventManager
     */
    protected $eventManager;
    
    /**
     * Constructs a new RulesReactionListBuilder object.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   The entity type definition.
     * @param \Drupal\Core\Entity\EntityStorageInterface $storage
     *   The entity storage class.
     * @param \Drupal\Core\RulesEventManager $eventManager
     *   The Rules event plugin manager.
     */
    public function __construct(EntityTypeInterface $entity_type, EntityStorageInterface $storage, RulesEventManager $eventManager) {
        parent::__construct($entity_type, $storage);
        // Disable the pager because this list builder uses client-side filters,
        // which requires all entities to be listed.
        $this->limit = FALSE;
        $this->eventManager = $eventManager;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
        return new static($entity_type, $container->get('entity_type.manager')
            ->getStorage($entity_type->id()), $container->get('plugin.manager.rules_event'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function load() {
        $entities = [
            'enabled' => [],
            'disabled' => [],
        ];
        foreach (parent::load() as $entity) {
            if ($entity->status()) {
                $entities['enabled'][] = $entity;
            }
            else {
                $entities['disabled'][] = $entity;
            }
        }
        return $entities;
    }
    
    /**
     * {@inheritdoc}
     *
     * Building the header and content lines for the reaction rules list.
     *
     * Calling the parent::buildHeader() adds a column for the possible actions
     * and inserts the 'edit' and 'delete' links as defined for the entity type.
     */
    public function buildHeader() {
        $header['label'] = $this->t('Reaction Rule');
        $header['event'] = $this->t('Event');
        $header['description'] = $this->t('Description');
        return $header + parent::buildHeader();
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildRow(EntityInterface $entity) {
        $event_names = $entity->getEventNames();
        $event_labels = [];
        // List all Events that trigger this Rule.
        foreach ($event_names as $event_name) {
            $event_definition = $this->eventManager
                ->getDefinition($event_name);
            $event_labels[] = $event_definition['label'];
        }
        
        /** @var \Drupal\rules\Entity\ReactionRuleConfig $entity */
        $details = $this->t('Machine name: @name', [
            '@name' => $entity->id(),
        ]);
        if ($entity->hasTags()) {
            $details = $details . '<br />' . $this->t('Tags: @tags', [
                '@tags' => implode(', ', $entity->getTags()),
            ]);
        }
        $row['label']['data-drupal-selector'] = 'rules-table-filter-text-source';
        $row['label']['data'] = [
            '#plain_text' => $entity->label(),
            '#suffix' => '<div class="description">' . $details . '</div>',
        ];
        $row['event']['data-drupal-selector'] = 'rules-table-filter-text-source';
        $row['event']['data'] = [
            '#markup' => implode(",<br />", $event_labels),
        ];
        $row['description']['data-drupal-selector'] = 'rules-table-filter-text-source';
        $row['description']['data'] = [
            '#type' => 'processed_text',
            '#text' => $entity->getDescription(),
            '#format' => 'restricted_html',
        ];
        return $row + parent::buildRow($entity);
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildOperations(EntityInterface $entity) {
        $build = parent::buildOperations($entity);
        uasort($build['#links'], 'Drupal\\Component\\Utility\\SortArray::sortByWeightElement');
        return $build;
    }
    
    /**
     * {@inheritdoc}
     */
    public function render() {
        $build['description'] = [
            '#prefix' => '<p>',
            '#markup' => $this->t('Reaction rules, listed below, react on selected events on the site. Each reaction rule may fire any number of <em>actions</em>, and may have any number of <em>conditions</em> that must be met for the actions to be executed. You can also set up <a href=":components">components</a> – stand-alone sets of Rules configuration that can be used in Rules and other parts of your site. See <a href=":documentation">the online documentation</a> for an introduction on how to use Rules.', [
                ':components' => Url::fromRoute('entity.rules_component.collection')->toString(),
                ':documentation' => 'https://www.drupal.org/node/298480',
            ]),
            '#suffix' => '</p>',
        ];
        $entities = $this->load();
        $build['#type'] = 'container';
        $build['#attributes']['id'] = 'rules-entity-list';
        $build['#attached']['library'][] = 'core/drupal.ajax';
        $build['#attached']['library'][] = 'rules/rules_ui.listing';
        $build['filters'] = [
            '#type' => 'container',
            '#attributes' => [
                'class' => [
                    'table-filter',
                    'js-show',
                ],
            ],
        ];
        $build['filters']['text'] = [
            '#type' => 'search',
            '#title' => $this->t('Filter'),
            '#title_display' => 'invisible',
            '#size' => 60,
            '#placeholder' => $this->t('Filter by rule name, machine name, event, description, or tag'),
            '#attributes' => [
                'class' => [
                    'rules-filter-text',
                ],
                'data-table' => '.rules-listing-table',
                'autocomplete' => 'off',
                'title' => $this->t('Enter a part of the rule name, machine name, event, description, or tag to filter by.'),
            ],
        ];
        $build['enabled']['heading'] = [
            '#prefix' => '<h2>',
            '#markup' => $this->t('Enabled', [], [
                'context' => 'Plural',
            ]),
            '#suffix' => '</h2>',
        ];
        $build['disabled']['heading'] = [
            '#prefix' => '<h2>',
            '#markup' => $this->t('Disabled', [], [
                'context' => 'Plural',
            ]),
            '#suffix' => '</h2>',
        ];
        foreach ([
            'enabled',
            'disabled',
        ] as $status) {
            $build[$status]['#type'] = 'container';
            $build[$status]['#attributes'] = [
                'class' => [
                    'rules-list-section',
                    $status,
                ],
            ];
            $build[$status]['table'] = [
                '#type' => 'table',
                '#header' => $this->buildHeader(),
                '#attributes' => [
                    'class' => [
                        'rules-listing-table',
                        $status,
                    ],
                ],
                '#cache' => [
                    'contexts' => $this->entityType
                        ->getListCacheContexts(),
                    'tags' => $this->entityType
                        ->getListCacheTags(),
                ],
            ];
            foreach ($entities[$status] as $entity) {
                $build[$status]['table']['#rows'][$entity->id()] = $this->buildRow($entity);
            }
        }
        $build['enabled']['table']['#empty'] = $this->t('There are no enabled @label.', [
            '@label' => $this->entityType
                ->getPluralLabel(),
        ]);
        $build['disabled']['table']['#empty'] = $this->t('There are no disabled @label.', [
            '@label' => $this->entityType
                ->getPluralLabel(),
        ]);
        return $build;
    }

}