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<?php

namespace Drupal\webform;

use Drupal\Core\Cache\Cache;
use Drupal\Core\Config\Entity\ConfigEntityStorage;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\Core\StreamWrapper\StreamWrapperInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Storage controller class for "webform" configuration entities.
 */
class WebformEntityStorage extends ConfigEntityStorage implements WebformEntityStorageInterface {

  /**
   * Active database connection.
   *
   * @var \Drupal\Core\Database\Connection
   */
  protected $database;

  /**
   * The entity type manager service.
   *
   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
   */
  protected $entityTypeManager;

  /**
   * The file system service.
   *
   * @var \Drupal\Core\File\FileSystemInterface
   */
  protected $fileSystem;

  /**
   * The cache backend service.
   *
   * @var \Drupal\Core\Cache\CacheBackendInterface
   */
  protected $cacheBackend;

  /**
   * The language manager.
   *
   * @var \Drupal\Core\Language\LanguageManagerInterface
   */
  protected $languageManager;

  /**
   * Associative array container total results for all webforms.
   *
   * @var array
   */
  protected $totals;

  /**
   * {@inheritdoc}
   */
  public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
    $instance = parent::createInstance($container, $entity_type);
    $instance->database = $container->get('database');
    $instance->entityTypeManager = $container->get('entity_type.manager');
    $instance->fileSystem = $container->get('file_system');
    $instance->cacheBackend = $container->get('cache.default');
    $instance->languageManager = $container->get('language_manager');
    return $instance;
  }

  /**
   * {@inheritdoc}
   */
  protected function doCreate(array $values) {
    $entity = parent::doCreate($values);
    // Cache new created webform entity so that it can be loaded using just the
    // webform's id.
    // @see '_webform_ui_temp_form'
    // @see \Drupal\webform_ui\Form\WebformUiElementTestForm
    // @see \Drupal\webform_ui\Form\WebformUiElementTypeFormBase
    $id = $entity->id();
    if ($id && $id === '_webform_ui_temp_form') {
      $this->setStaticCache([$id => $entity]);
    }
    return $entity;
  }

  /**
   * {@inheritdoc}
   */
  protected function doPostSave(EntityInterface $entity, $update) {
    if ($update && $entity->getAccessRules() !== $entity->original->getAccessRules()) {
      // Invalidate webform_submission listing cache tags because due to the
      // change in access rules of this webform, some listings might have
      // changed for users.
      $cache_tags = $this->entityTypeManager->getDefinition('webform_submission')->getListCacheTags();
      Cache::invalidateTags($cache_tags);
    }

    parent::doPostSave($entity, $update);
  }

  /**
   * {@inheritdoc}
   */
  public function save(EntityInterface $entity) {
    $return = parent::save($entity);
    if ($return === SAVED_NEW) {
      // Insert webform database record used for transaction tracking.
      $this->database->insert('webform')
        ->fields([
          'webform_id' => $entity->id(),
          'next_serial' => 1,
        ])
        ->execute();
    }
    return $return;
  }

  /**
   * {@inheritdoc}
   */
  public function delete(array $entities) {
    parent::delete($entities);
    if (!$entities) {
      // If no entities were passed, do nothing.
      return;
    }

    // Delete all webform submission log entries.
    $webform_ids = [];
    foreach ($entities as $entity) {
      $webform_ids[] = $entity->id();
    }

    // Delete all webform records used to track next serial.
    $this->database->delete('webform')
      ->condition('webform_id', $webform_ids, 'IN')
      ->execute();

    // Remove the webform specific file directory for all stream wrappers.
    // @see \Drupal\webform\Plugin\WebformElement\WebformManagedFileBase
    // @see \Drupal\webform\Plugin\WebformElement\WebformSignature
    foreach ($entities as $entity) {
      $stream_wrappers = array_keys(\Drupal::service('stream_wrapper_manager')
        ->getNames(StreamWrapperInterface::WRITE_VISIBLE));
      foreach ($stream_wrappers as $stream_wrapper) {
        $file_directory = $stream_wrapper . '://webform/' . $entity->id();

        if (file_exists($file_directory)) {
          // Clear all signature files.
          // @see \Drupal\webform\Plugin\WebformElement\WebformSignature::getImageUrl
          $files = $this->fileSystem->scanDirectory($file_directory, '/^signature-.*/');
          foreach (array_keys($files) as $uri) {
            $this->fileSystem->delete($uri);
          }

          // Clear empty webform directory.
          if (empty($this->fileSystem->scanDirectory($file_directory, '/.*/'))) {
            $this->fileSystem->deleteRecursive($file_directory);
          }
        }
      }
    }

    $this->resetCategoriesCache();
  }

  /**
   * Get all webform ids.
   *
   * @return array
   *   An array containing all webform ids.
   */
  public function getWebformIds() {
    if ($cache = $this->cacheBackend->get('webform_ids')) {
      return $cache->data;
    }
    $webform_ids = array_values($this->getQuery()->execute());
    $this->cacheBackend->get('webform_ids', $webform_ids, Cache::PERMANENT, ['config:webform_list']);
    return $webform_ids;
  }

  /**
   * {@inheritdoc}
   */
  public function getCategories($template = NULL, $default = FALSE) {
    // Get categories cache key which includes langcode and template type.
    $cache_key = $this->languageManager->getCurrentLanguage()->getId();
    if ($template === FALSE) {
      $cache_key .= '.forms';
    }
    elseif ($template === TRUE) {
      $cache_key .= '.templates';
    }
    else {
      $cache_key .= '.all';
    }
    if ($default) {
      $cache_key .= '.default';
    }

    // Get categories cached data.
    $cache = $this->cacheBackend->get('webform.categories');
    $cache_data = ($cache) ? $cache->data : [];
    if (isset($cache_data[$cache_key])) {
      return $cache_data[$cache_key];
    }

    $categories = [];

    // Append default categories.
    if ($default) {
      $default_categories = $this->configFactory->get('webform.settings')
        ->get('settings.default_categories');
      if ($default_categories) {
        $categories += array_combine($default_categories, $default_categories);
      }
    }

    // Append selected categories.
    $webforms = $this->loadMultiple();
    foreach ($webforms as $webform) {
      if ($template !== NULL && $webform->get('template') !== $template) {
        continue;
      }
      if ($webform_categories = $webform->get('categories')) {
        $categories += array_combine($webform_categories, $webform_categories);
      }
    }
    ksort($categories);

    // Add to categories cached data.
    $this->cacheBackend->set('webform.categories', [$cache_key => $categories] + $cache_data);

    return $categories;
  }

  /**
   * {@inheritdoc}
   */
  public function resetCategoriesCache() {
    $this->cacheBackend->delete('webform.categories');
  }

  /**
   * {@inheritdoc}
   */
  public function getOptions($template = NULL) {
    /** @var \Drupal\webform\WebformInterface[] $webforms */
    $webforms = $this->loadMultiple();
    @uasort($webforms, [$this->entityType->getClass(), 'sort']);

    $uncategorized_options = [];
    $categorized_options = [];
    foreach ($webforms as $id => $webform) {
      // Skip templates.
      if ($template !== NULL && $webform->get('template') !== $template) {
        continue;
      }
      // Skip archived.
      if ($webform->isArchived()) {
        continue;
      }

      if ($categories = $webform->get('categories')) {
        $categorized_options[reset($categories)][$id] = $webform->label();
      }
      else {
        $uncategorized_options[$id] = $webform->label();
      }
    }

    // Merge uncategorized options with categorized options.
    $options = $uncategorized_options;
    foreach ($categorized_options as $optgroup => $optgroup_options) {
      // If webform id and optgroup conflict move the webform into the optgroup.
      if (isset($options[$optgroup])) {
        $options[$optgroup] = [$optgroup => $options[$optgroup]]
          + $optgroup_options;
        asort($options[$optgroup]);
      }
      else {
        $options[$optgroup] = $optgroup_options;
      }
    }

    return $options;
  }

  /**
   * {@inheritdoc}
   */
  public function getNextSerial(WebformInterface $webform) {
    return $this->database->select('webform', 'w')
      ->fields('w', ['next_serial'])
      ->condition('webform_id', $webform->id())
      ->execute()
      ->fetchField();
  }

  /**
   * {@inheritdoc}
   */
  public function setNextSerial(WebformInterface $webform, $next_serial = 1) {
    $this->database->update('webform')
      ->fields(['next_serial' => $next_serial])
      ->condition('webform_id', $webform->id())
      ->execute();
  }

  /**
   * {@inheritdoc}
   */
  public function getSerial(WebformInterface $webform) {
    // Use a transaction with SELECT … FOR UPDATE to lock the row between
    // the SELECT and the UPDATE, ensuring that multiple Webform submissions
    // at the same time do not have duplicate numbers. FOR UPDATE must be inside
    // a transaction. The return value of db_transaction() must be assigned or
    // the transaction will commit immediately.
    //
    // The transaction will commit when $transaction goes out-of-scope.
    //
    // @see \Drupal\Core\Database\Transaction
    // phpcs:ignore DrupalPractice.CodeAnalysis.VariableAnalysis.UnusedVariable
    $transaction = $this->database->startTransaction();

    // Get the next_serial value.
    $next_serial = $this->database->select('webform', 'w')
      // Only add FOR UPDATE when incrementing.
      ->forUpdate()
      ->fields('w', ['next_serial'])
      ->condition('webform_id', $webform->id())
      ->execute()
      ->fetchField();

    // $next_serial must be greater than any existing serial number.
    $next_serial = max($next_serial, $this->getMaxSerial($webform));

    // Increment the next_value.
    $this->database->update('webform')
      ->fields(['next_serial' => $next_serial + 1])
      ->condition('webform_id', $webform->id())
      ->execute();

    return $next_serial;
  }

  /**
   * {@inheritdoc}
   */
  public function getMaxSerial(WebformInterface $webform) {
    $query = $this->database->select('webform_submission');
    $query->condition('webform_id', $webform->id());
    $query->addExpression('MAX(serial)');
    return $query->execute()->fetchField() + 1;
  }

  /**
   * {@inheritdoc}
   */
  public function getTotalNumberOfResults($webform_id = NULL) {
    if ($webform_id) {
      $query = $this->database->select('webform_submission', 'ws');
      $query->condition('webform_id', $webform_id);
      $query->addExpression('COUNT(sid)', 'results');
      return $query->execute()->fetchField() ?: 0;
    }
    else {
      $query = $this->database->select('webform_submission', 'ws');
      $query->fields('ws', ['webform_id']);
      $query->addExpression('COUNT(sid)', 'results');
      $query->groupBy('webform_id');
      return array_map('intval', $query->execute()->fetchAllKeyed());
    }
  }

}