class RestResourceConfig

class RestResourceConfig extends ConfigEntityBase implements RestResourceConfigInterface {
    
    /**
     * The REST resource config id.
     *
     * @var string
     */
    protected $id;
    
    /**
     * The REST resource plugin id.
     *
     * @var string
     */
    protected $plugin_id;
    
    /**
     * The REST resource configuration granularity.
     *
     * Currently either:
     * - \Drupal\rest\RestResourceConfigInterface::METHOD_GRANULARITY
     * - \Drupal\rest\RestResourceConfigInterface::RESOURCE_GRANULARITY
     *
     * @var string
     */
    protected $granularity;
    
    /**
     * The REST resource configuration.
     *
     * @var array
     */
    protected $configuration;
    
    /**
     * The rest resource plugin manager.
     *
     * @var \Drupal\Component\Plugin\PluginManagerInterface
     */
    protected $pluginManager;
    
    /**
     * {@inheritdoc}
     */
    public function __construct(array $values, $entity_type) {
        parent::__construct($values, $entity_type);
        // The config entity id looks like the plugin id but uses __ instead of :
        // because : is not valid for config entities.
        if (!isset($this->plugin_id) && isset($this->id)) {
            // Generate plugin_id on first entity creation.
            $this->plugin_id = str_replace('.', ':', $this->id);
        }
    }
    
    /**
     * Returns the resource plugin manager.
     *
     * @return \Drupal\Component\Plugin\PluginManagerInterface
     */
    protected function getResourcePluginManager() {
        if (!isset($this->pluginManager)) {
            $this->pluginManager = \Drupal::service('plugin.manager.rest');
        }
        return $this->pluginManager;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getResourcePlugin() {
        return $this->getPluginCollections()['resource']
            ->get($this->plugin_id);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getMethods() {
        switch ($this->granularity) {
            case RestResourceConfigInterface::METHOD_GRANULARITY:
                return $this->getMethodsForMethodGranularity();
            case RestResourceConfigInterface::RESOURCE_GRANULARITY:
                return $this->configuration['methods'];
            default:
                throw new \InvalidArgumentException('Invalid granularity specified.');
        }
    }
    
    /**
     * Retrieves a list of supported HTTP methods for this resource.
     *
     * @return string[]
     *   A list of supported HTTP methods.
     */
    protected function getMethodsForMethodGranularity() {
        $methods = array_keys($this->configuration);
        return array_map([
            $this,
            'normalizeRestMethod',
        ], $methods);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getAuthenticationProviders($method) {
        switch ($this->granularity) {
            case RestResourceConfigInterface::METHOD_GRANULARITY:
                return $this->getAuthenticationProvidersForMethodGranularity($method);
            case RestResourceConfigInterface::RESOURCE_GRANULARITY:
                return $this->configuration['authentication'];
            default:
                throw new \InvalidArgumentException('Invalid granularity specified.');
        }
    }
    
    /**
     * Retrieves a list of supported authentication providers.
     *
     * @param string $method
     *   The request method e.g GET or POST.
     *
     * @return string[]
     *   A list of supported authentication provider IDs.
     */
    public function getAuthenticationProvidersForMethodGranularity($method) {
        $method = $this->normalizeRestMethod($method);
        if (in_array($method, $this->getMethods()) && isset($this->configuration[$method]['supported_auth'])) {
            return $this->configuration[$method]['supported_auth'];
        }
        return [];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormats($method) {
        switch ($this->granularity) {
            case RestResourceConfigInterface::METHOD_GRANULARITY:
                return $this->getFormatsForMethodGranularity($method);
            case RestResourceConfigInterface::RESOURCE_GRANULARITY:
                return $this->configuration['formats'];
            default:
                throw new \InvalidArgumentException('Invalid granularity specified.');
        }
    }
    
    /**
     * Retrieves a list of supported response formats.
     *
     * @param string $method
     *   The request method e.g GET or POST.
     *
     * @return string[]
     *   A list of supported format IDs.
     */
    protected function getFormatsForMethodGranularity($method) {
        $method = $this->normalizeRestMethod($method);
        if (in_array($method, $this->getMethods()) && isset($this->configuration[$method]['supported_formats'])) {
            return $this->configuration[$method]['supported_formats'];
        }
        return [];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getPluginCollections() {
        return [
            'resource' => new DefaultSingleLazyPluginCollection($this->getResourcePluginManager(), $this->plugin_id, []),
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function calculateDependencies() {
        parent::calculateDependencies();
        foreach ($this->getRestResourceDependencies()
            ->calculateDependencies($this) as $type => $dependencies) {
            foreach ($dependencies as $dependency) {
                $this->addDependency($type, $dependency);
            }
        }
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function onDependencyRemoval(array $dependencies) {
        $parent = parent::onDependencyRemoval($dependencies);
        // If the dependency problems are not marked as fixed at this point they
        // should be related to the resource plugin and the config entity should
        // be deleted.
        $changed = $this->getRestResourceDependencies()
            ->onDependencyRemoval($this, $dependencies);
        return $parent || $changed;
    }
    
    /**
     * Returns the REST resource dependencies.
     *
     * @return \Drupal\rest\Entity\ConfigDependencies
     */
    protected function getRestResourceDependencies() {
        return \Drupal::service('class_resolver')->getInstanceFromDefinition(ConfigDependencies::class);
    }
    
    /**
     * Normalizes the method.
     *
     * @param string $method
     *   The request method.
     *
     * @return string
     *   The normalized request method.
     */
    protected function normalizeRestMethod($method) {
        return strtoupper($method);
    }
    
    /**
     * {@inheritdoc}
     */
    public function postSave(EntityStorageInterface $storage, $update = TRUE) {
        parent::postSave($storage, $update);
        \Drupal::service('router.builder')->setRebuildNeeded();
    }
    
    /**
     * {@inheritdoc}
     */
    public static function postDelete(EntityStorageInterface $storage, array $entities) {
        parent::postDelete($storage, $entities);
        \Drupal::service('router.builder')->setRebuildNeeded();
    }

}