class EntityMethod

final class EntityMethod implements ConfigActionPluginInterface, ContainerFactoryPluginInterface {
    
    /**
     * Constructs a EntityMethod object.
     *
     * @param string $pluginId
     *   The config action plugin ID.
     * @param \Drupal\Core\Config\ConfigManagerInterface $configManager
     *   The config manager.
     * @param string $method
     *   The method to call on the config entity.
     * @param \Drupal\Core\Config\Action\Exists $exists
     *   Determines behavior of action depending on entity existence.
     * @param int $numberOfParams
     *   The number of parameters the method has.
     * @param int $numberOfRequiredParams
     *   The number of required parameters the method has.
     * @param bool $pluralized
     *   Determines whether an array maps to multiple calls.
     */
    public function __construct(string $pluginId, ConfigManagerInterface $configManager, string $method, Exists $exists, int $numberOfParams, int $numberOfRequiredParams, bool $pluralized) {
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) : static {
        assert(is_array($plugin_definition) && is_array($plugin_definition['constructor_args']), '$plugin_definition contains the expected settings');
        return new static($plugin_id, $container->get('config.manager'), ...$plugin_definition['constructor_args']);
    }
    
    /**
     * {@inheritdoc}
     */
    public function apply(string $configName, mixed $value) : void {
        
        /** @var \Drupal\Core\Config\Entity\ConfigEntityInterface|null $entity */
        $entity = $this->configManager
            ->loadConfigEntityByName($configName);
        if ($this->exists
            ->returnEarly($configName, $entity)) {
            return;
        }
        $entity = $this->pluralized ? $this->applyPluralized($entity, $value) : $this->applySingle($entity, $value);
        $entity->save();
    }
    
    /**
     * Applies the action to entity treating the $values array as multiple calls.
     *
     * @param \Drupal\Core\Config\Entity\ConfigEntityInterface $entity
     *   The entity to apply the action to.
     * @param mixed $values
     *   The values for the action to use.
     *
     * @return \Drupal\Core\Config\Entity\ConfigEntityInterface
     *   The unsaved entity with the action applied.
     */
    private function applyPluralized(ConfigEntityInterface $entity, mixed $values) : ConfigEntityInterface {
        if (!is_array($values)) {
            throw new EntityMethodException(sprintf('The pluralized entity method config action \'%s\' requires an array value in order to call %s::%s() multiple times', $this->pluginId, $entity->getEntityType()
                ->getClass(), $this->method));
        }
        foreach ($values as $value) {
            $entity = $this->applySingle($entity, $value);
        }
        return $entity;
    }
    
    /**
     * Applies the action to entity treating the $values array a single call.
     *
     * @param \Drupal\Core\Config\Entity\ConfigEntityInterface $entity
     *   The entity to apply the action to.
     * @param mixed $value
     *   The value for the action to use.
     *
     * @return \Drupal\Core\Config\Entity\ConfigEntityInterface
     *   The unsaved entity with the action applied.
     */
    private function applySingle(ConfigEntityInterface $entity, mixed $value) : ConfigEntityInterface {
        // If $value is not an array then we only support calling the method if the
        // number of parameters or required parameters is 1. If there is only 1
        // parameter and $value is an array then assume that the parameter expects
        // an array.
        if (!is_array($value) || $this->numberOfParams === 1) {
            if ($this->numberOfRequiredParams !== 1 && $this->numberOfParams !== 1) {
                throw new EntityMethodException(sprintf('Entity method config action \'%s\' requires an array value. The number of parameters or required parameters for %s::%s() is not 1', $this->pluginId, $entity->getEntityType()
                    ->getClass(), $this->method));
            }
            $result = $entity->{$this->method}($value);
        }
        else {
            $result = $entity->{$this->method}(...$value);
        }
        // If an instance of the entity (either itself, or a clone) was returned
        // by the method, return that.
        return is_a($result, get_class($entity)) ? $result : $entity;
    }

}