class SearchPageListBuilder

class SearchPageListBuilder extends DraggableListBuilder implements FormInterface {
    use ConfigFormBaseTrait;
    
    /**
     * The entities being listed.
     *
     * @var \Drupal\search\SearchPageInterface[]
     */
    protected $entities = [];
    
    /**
     * Stores the configuration factory.
     *
     * @var \Drupal\Core\Config\ConfigFactoryInterface
     */
    protected $configFactory;
    
    /**
     * The search manager.
     *
     * @var \Drupal\search\SearchPluginManager
     */
    protected $searchManager;
    
    /**
     * The search index.
     *
     * @var \Drupal\search\SearchIndexInterface
     */
    protected $searchIndex;
    
    /**
     * The messenger.
     *
     * @var \Drupal\Core\Messenger\MessengerInterface
     */
    protected $messenger;
    
    /**
     * Constructs a new SearchPageListBuilder object.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   The entity type definition.
     * @param \Drupal\Core\Entity\EntityStorageInterface $storage
     *   The entity storage class.
     * @param \Drupal\search\SearchPluginManager $search_manager
     *   The search plugin manager.
     * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
     *   The factory for configuration objects.
     * @param \Drupal\Core\Messenger\MessengerInterface $messenger
     *   The messenger.
     * @param \Drupal\search\SearchIndexInterface $search_index
     *   The search index.
     */
    public function __construct(EntityTypeInterface $entity_type, EntityStorageInterface $storage, SearchPluginManager $search_manager, ConfigFactoryInterface $config_factory, MessengerInterface $messenger, SearchIndexInterface $search_index) {
        parent::__construct($entity_type, $storage);
        $this->configFactory = $config_factory;
        $this->searchManager = $search_manager;
        $this->messenger = $messenger;
        $this->searchIndex = $search_index;
    }
    
    /**
     * {@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.search'), $container->get('config.factory'), $container->get('messenger'), $container->get('search.index'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'search_admin_settings';
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getEditableConfigNames() {
        return [
            'search.settings',
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildHeader() {
        $header['label'] = [
            'data' => $this->t('Label'),
        ];
        $header['url'] = [
            'data' => $this->t('URL'),
            'class' => [
                RESPONSIVE_PRIORITY_LOW,
            ],
        ];
        $header['plugin'] = [
            'data' => $this->t('Type'),
            'class' => [
                RESPONSIVE_PRIORITY_LOW,
            ],
        ];
        $header['status'] = [
            'data' => $this->t('Status'),
        ];
        $header['progress'] = [
            'data' => $this->t('Indexing progress'),
            'class' => [
                RESPONSIVE_PRIORITY_MEDIUM,
            ],
        ];
        return $header + parent::buildHeader();
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildRow(EntityInterface $entity) {
        
        /** @var \Drupal\search\SearchPageInterface $entity */
        $row['label'] = $entity->label();
        $row['url']['#markup'] = 'search/' . $entity->getPath();
        // If the search page is active, link to it.
        if ($entity->status()) {
            $row['url'] = [
                '#type' => 'link',
                '#title' => $row['url'],
                '#url' => Url::fromRoute('search.view_' . $entity->id()),
            ];
        }
        $definition = $entity->getPlugin()
            ->getPluginDefinition();
        $row['plugin']['#markup'] = $definition['title'];
        if ($entity->isDefaultSearch()) {
            $status = $this->t('Default');
        }
        elseif ($entity->status()) {
            $status = $this->t('Enabled');
        }
        else {
            $status = $this->t('Disabled');
        }
        $row['status']['#markup'] = $status;
        if ($entity->isIndexable()) {
            $status = $entity->getPlugin()
                ->indexStatus();
            $row['progress']['#markup'] = $this->t('%num_indexed of %num_total indexed', [
                '%num_indexed' => $status['total'] - $status['remaining'],
                '%num_total' => $status['total'],
            ]);
        }
        else {
            $row['progress']['#markup'] = $this->t('Does not use index');
        }
        return $row + parent::buildRow($entity);
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state) {
        $form = parent::buildForm($form, $form_state);
        $search_settings = $this->config('search.settings');
        // Collect some stats.
        $remaining = 0;
        $total = 0;
        foreach ($this->entities as $entity) {
            if ($entity->isIndexable() && ($status = $entity->getPlugin()
                ->indexStatus())) {
                $remaining += $status['remaining'];
                $total += $status['total'];
            }
        }
        $this->moduleHandler
            ->loadAllIncludes('admin.inc');
        $count = $this->formatPlural($remaining, 'There is 1 item left to index.', 'There are @count items left to index.');
        $done = $total - $remaining;
        // Use floor() to calculate the percentage, so if it is not quite 100%, it
        // will show as 99%, to indicate "almost done".
        $percentage = $total > 0 ? floor(100 * $done / $total) : 100;
        $percentage .= '%';
        $status = '<p><strong>' . $this->t('%percentage of the site has been indexed.', [
            '%percentage' => $percentage,
        ]) . ' ' . $count . '</strong></p>';
        $form['status'] = [
            '#type' => 'details',
            '#title' => $this->t('Indexing progress'),
            '#open' => TRUE,
            '#description' => $this->t('Only items in the index will appear in search results. To build and maintain the index, a correctly configured <a href=":cron">cron maintenance task</a> is required.', [
                ':cron' => Url::fromRoute('system.cron_settings')->toString(),
            ]),
        ];
        $form['status']['status'] = [
            '#markup' => $status,
        ];
        $form['status']['wipe'] = [
            '#type' => 'submit',
            '#value' => $this->t('Re-index site'),
            '#submit' => [
                '::searchAdminReindexSubmit',
            ],
        ];
        $items = [
            10,
            20,
            50,
            100,
            200,
            500,
        ];
        $items = array_combine($items, $items);
        // Indexing throttle:
        $form['indexing_throttle'] = [
            '#type' => 'details',
            '#title' => $this->t('Indexing throttle'),
            '#open' => TRUE,
        ];
        $form['indexing_throttle']['cron_limit'] = [
            '#type' => 'select',
            '#title' => $this->t('Number of items to index per run'),
            '#default_value' => $search_settings->get('index.cron_limit'),
            '#options' => $items,
            '#description' => $this->t('The maximum number of items processed per indexing run. If necessary, reduce the number of items to prevent timeouts and memory errors while indexing. Some search page types may have their own setting for this.'),
        ];
        // Indexing settings:
        $form['indexing_settings'] = [
            '#type' => 'details',
            '#title' => $this->t('Default indexing settings'),
            '#open' => TRUE,
            '#description' => $this->t('Changing these settings will cause the default search index to be rebuilt to reflect the new settings. Searching will continue to work, based on the existing index, but new content will not be indexed until all existing content has been re-indexed.'),
        ];
        $form['indexing_settings']['minimum_word_size'] = [
            '#type' => 'number',
            '#title' => $this->t('Minimum word length to index'),
            '#default_value' => $search_settings->get('index.minimum_word_size'),
            '#min' => 1,
            '#max' => 1000,
            '#description' => $this->t('The minimum character length for a word to be added to the index. Searches must include a keyword of at least this length.'),
        ];
        $form['indexing_settings']['overlap_cjk'] = [
            '#type' => 'checkbox',
            '#title' => $this->t('Simple CJK handling'),
            '#default_value' => $search_settings->get('index.overlap_cjk'),
            '#description' => $this->t('Whether to apply a simple Chinese/Japanese/Korean tokenizer based on overlapping sequences. Turn this off if you want to use an external preprocessor for this instead. Does not affect other languages.'),
        ];
        // Indexing settings:
        $form['logging'] = [
            '#type' => 'details',
            '#title' => $this->t('Logging'),
            '#open' => TRUE,
        ];
        $form['logging']['logging'] = [
            '#type' => 'checkbox',
            '#title' => $this->t('Log searches'),
            '#default_value' => $search_settings->get('logging'),
            '#description' => $this->t('If checked, all searches will be logged. Uncheck to skip logging. Logging may affect performance.'),
        ];
        $form['search_pages'] = [
            '#type' => 'details',
            '#title' => $this->t('Search pages'),
            '#open' => TRUE,
        ];
        $form['search_pages']['add_page'] = [
            '#type' => 'container',
            '#attributes' => [
                'class' => [
                    'container-inline',
                ],
            ],
        ];
        // In order to prevent validation errors for the parent form, this cannot be
        // required, see self::validateAddSearchPage().
        $form['search_pages']['add_page']['search_type'] = [
            '#type' => 'select',
            '#title' => $this->t('Search page type'),
            '#empty_option' => $this->t('- Choose page type -'),
            '#options' => array_map(function ($definition) {
                return $definition['title'];
            }, $this->searchManager
                ->getDefinitions()),
        ];
        $form['search_pages']['add_page']['add_search_submit'] = [
            '#type' => 'submit',
            '#value' => $this->t('Add search page'),
            '#validate' => [
                '::validateAddSearchPage',
            ],
            '#submit' => [
                '::submitAddSearchPage',
            ],
            '#limit_validation_errors' => [
                [
                    'search_type',
                ],
            ],
        ];
        // Move the listing into the search_pages element.
        $form['search_pages'][$this->entitiesKey] = $form[$this->entitiesKey];
        $form['search_pages'][$this->entitiesKey]['#empty'] = $this->t('No search pages have been configured.');
        unset($form[$this->entitiesKey]);
        $form['actions']['#type'] = 'actions';
        $form['actions']['submit'] = [
            '#type' => 'submit',
            '#value' => $this->t('Save configuration'),
            '#button_type' => 'primary',
        ];
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDefaultOperations(EntityInterface $entity) {
        
        /** @var \Drupal\search\SearchPageInterface $entity */
        $operations = parent::getDefaultOperations($entity);
        // Prevent the default search from being disabled or deleted.
        if ($entity->isDefaultSearch()) {
            unset($operations['disable'], $operations['delete']);
        }
        else {
            $operations['default'] = [
                'title' => $this->t('Set as default'),
                'url' => Url::fromRoute('entity.search_page.set_default', [
                    'search_page' => $entity->id(),
                ]),
                'weight' => 50,
            ];
        }
        return $operations;
    }
    
    /**
     * {@inheritdoc}
     */
    public function validateForm(array &$form, FormStateInterface $form_state) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        parent::submitForm($form, $form_state);
        $search_settings = $this->config('search.settings');
        // If these settings change, the default index needs to be rebuilt.
        if ($search_settings->get('index.minimum_word_size') != $form_state->getValue('minimum_word_size') || $search_settings->get('index.overlap_cjk') != $form_state->getValue('overlap_cjk')) {
            $search_settings->set('index.minimum_word_size', $form_state->getValue('minimum_word_size'));
            $search_settings->set('index.overlap_cjk', $form_state->getValue('overlap_cjk'));
            // Specifically mark items in the default index for reindexing, since
            // these settings are used in the SearchIndex::index() function.
            $this->messenger
                ->addStatus($this->t('The default search index will be rebuilt.'));
            $this->searchIndex
                ->markForReindex();
        }
        $search_settings->set('index.cron_limit', $form_state->getValue('cron_limit'))
            ->set('logging', $form_state->getValue('logging'))
            ->save();
        $this->messenger
            ->addStatus($this->t('The configuration options have been saved.'));
    }
    
    /**
     * Form submission handler for reindex button on search admin settings form.
     */
    public function searchAdminReindexSubmit(array &$form, FormStateInterface $form_state) {
        // Send the user to the confirmation page.
        $form_state->setRedirect('search.reindex_confirm');
    }
    
    /**
     * Form validation handler for adding a new search page.
     */
    public function validateAddSearchPage(array &$form, FormStateInterface $form_state) {
        if ($form_state->isValueEmpty('search_type')) {
            $form_state->setErrorByName('search_type', $this->t('You must select the new search page type.'));
        }
    }
    
    /**
     * Form submission handler for adding a new search page.
     */
    public function submitAddSearchPage(array &$form, FormStateInterface $form_state) {
        $form_state->setRedirect('search.add_type', [
            'search_plugin_id' => $form_state->getValue('search_type'),
        ]);
    }

}