class TopBarItemManager

final class TopBarItemManager extends DefaultPluginManager implements TopBarItemManagerInterface {
  
  /**
   * Constructs the object.
   */
  public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler) {
    parent::__construct('Plugin/TopBarItem', $namespaces, $module_handler, TopBarItemPluginInterface::class, TopBarItem::class);
    $this->alterInfo('top_bar_item');
    $this->setCacheBackend($cache_backend, 'top_bar_item_plugins');
  }
  
  /**
   * {@inheritdoc}
   */
  public function getDefinitionsByRegion(TopBarRegion $region) : array {
    return array_filter($this->getDefinitions(), fn(array $definition) => $definition['region'] === $region);
  }
  
  /**
   * {@inheritdoc}
   */
  public function getRenderedTopBarItemsByRegion(TopBarRegion $region) : array {
    $instances = [];
    foreach ($this->getDefinitionsByRegion($region) as $plugin_id => $plugin_definition) {
      $instances[$plugin_id] = $this->createInstance($plugin_id)
        ->build();
    }
    return $instances;
  }
  
  /**
   * {@inheritdoc}
   */
  public function getDefinitions() : array {
    $definitions = parent::getDefinitions();
    // Sort definitions by weight.
    uasort($definitions, function (array $a, array $b) {
      return ($a['weight'] ?? 0) <=> ($b['weight'] ?? 0);
    });
    return $definitions;
  }

}