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<?php

namespace Drupal\views\Plugin\views\relationship;

use Drupal\views\Attribute\ViewsRelationship;
use Drupal\views\Plugin\ViewsHandlerManager;
use Drupal\views\Views;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * A relationship handlers which reverse entity references.
 *
 * @ingroup views_relationship_handlers
 */
#[ViewsRelationship("entity_reverse")]
class EntityReverse extends RelationshipPluginBase {

  /**
   * The views plugin join manager.
   */
  public ViewsHandlerManager $joinManager;

  /**
   * The alias for the left table.
   */
  // phpcs:ignore Drupal.NamingConventions.ValidVariableName.LowerCamelName
  public string $first_alias;

  /**
   * Constructs an EntityReverse object.
   *
   * @param array $configuration
   *   A configuration array containing information about the plugin instance.
   * @param string $plugin_id
   *   The plugin ID for the plugin instance.
   * @param array $plugin_definition
   *   The plugin implementation definition.
   * @param \Drupal\views\Plugin\ViewsHandlerManager $join_manager
   *   The views plugin join manager.
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition, ViewsHandlerManager $join_manager) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
    $this->joinManager = $join_manager;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static(
      $configuration,
      $plugin_id,
      $plugin_definition,
      $container->get('plugin.manager.views.join')
    );
  }

  /**
   * Called to implement a relationship in a query.
   */
  public function query() {
    $this->ensureMyTable();
    // First, relate our base table to the current base table to the
    // field, using the base table's id field to the field's column.
    $views_data = Views::viewsData()->get($this->table);
    $left_field = $views_data['table']['base']['field'];

    $first = [
      'left_table' => $this->tableAlias,
      'left_field' => $left_field,
      'table' => $this->definition['field table'],
      'field' => $this->definition['field field'],
      'adjusted' => TRUE,
    ];
    if (!empty($this->options['required'])) {
      $first['type'] = 'INNER';
    }

    if (!empty($this->definition['join_extra'])) {
      $first['extra'] = $this->definition['join_extra'];
    }

    $first_join = $this->joinManager->createInstance('standard', $first);

    $this->first_alias = $this->query->addTable($this->definition['field table'], $this->relationship, $first_join);

    // Second, relate the field table to the entity specified using
    // the entity id on the field table and the entity's id field.
    $second = [
      'left_table' => $this->first_alias,
      'left_field' => 'entity_id',
      'table' => $this->definition['base'],
      'field' => $this->definition['base field'],
      'adjusted' => TRUE,
    ];

    if (!empty($this->options['required'])) {
      $second['type'] = 'INNER';
    }

    $second_join = $this->joinManager->createInstance('standard', $second);
    $second_join->adjusted = TRUE;

    // Use a short alias for this:
    $alias = $this->definition['field_name'] . '_' . $this->table;

    $this->alias = $this->query->addRelationship($alias, $second_join, $this->definition['base'], $this->relationship);
  }

}