class ContentLanguageSettings

class ContentLanguageSettings extends ConfigEntityBase implements ContentLanguageSettingsInterface {
    
    /**
     * The id. Combination of $target_entity_type_id.$target_bundle.
     *
     * @var string
     */
    protected $id;
    
    /**
     * The entity type ID (machine name).
     *
     * @var string
     */
    protected $target_entity_type_id;
    
    /**
     * The bundle (machine name).
     *
     * @var string
     */
    protected $target_bundle;
    
    /**
     * The default language code.
     *
     * @var string
     */
    protected $default_langcode = LanguageInterface::LANGCODE_SITE_DEFAULT;
    
    /**
     * Indicates if the language is alterable or not.
     *
     * @var bool
     */
    protected $language_alterable = FALSE;
    
    /**
     * Constructs a ContentLanguageSettings object.
     *
     * In most cases, Field entities are created via
     * FieldConfig::create($values), where $values is the same
     * parameter as in this constructor.
     *
     * @param array $values
     *   An array of the referring entity bundle with:
     *   - target_entity_type_id: The entity type.
     *   - target_bundle: The bundle.
     *   Other array elements will be used to set the corresponding properties on
     *   the class; see the class property documentation for details.
     * @param string $entity_type
     *   (optional) The entity type ID that is being created. Defaults to
     *   "language_content_settings".
     */
    public function __construct(array $values, $entity_type = 'language_content_settings') {
        if (empty($values['target_entity_type_id'])) {
            throw new ContentLanguageSettingsException('Attempt to create content language settings without a target_entity_type_id.');
        }
        if (empty($values['target_bundle'])) {
            throw new ContentLanguageSettingsException('Attempt to create content language settings without a target_bundle.');
        }
        parent::__construct($values, $entity_type);
    }
    
    /**
     * {@inheritdoc}
     */
    public function id() {
        return $this->target_entity_type_id . '.' . $this->target_bundle;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getTargetEntityTypeId() {
        return $this->target_entity_type_id;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getTargetBundle() {
        return $this->target_bundle;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setTargetBundle($target_bundle) {
        $this->target_bundle = $target_bundle;
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setDefaultLangcode($default_langcode) {
        $this->default_langcode = $default_langcode;
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDefaultLangcode() {
        return $this->default_langcode;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setLanguageAlterable($language_alterable) {
        $this->language_alterable = $language_alterable;
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function isLanguageAlterable() {
        return $this->language_alterable;
    }
    
    /**
     * {@inheritdoc}
     */
    public function preSave(EntityStorageInterface $storage) {
        $this->id = $this->id();
        parent::preSave($storage);
    }
    
    /**
     * {@inheritdoc}
     */
    public function isDefaultConfiguration() {
        return !$this->language_alterable && $this->default_langcode == LanguageInterface::LANGCODE_SITE_DEFAULT;
    }
    
    /**
     * Loads a content language config entity based on the entity type and bundle.
     *
     * @param string $entity_type_id
     *   ID of the entity type.
     * @param string $bundle
     *   Bundle name.
     *
     * @return $this
     *   The content language config entity if one exists. Otherwise, returns
     *   default values.
     */
    public static function loadByEntityTypeBundle($entity_type_id, $bundle) {
        if ($entity_type_id == NULL || $bundle == NULL) {
            return NULL;
        }
        $config = \Drupal::entityTypeManager()->getStorage('language_content_settings')
            ->load($entity_type_id . '.' . $bundle);
        if ($config == NULL) {
            $config = ContentLanguageSettings::create([
                'target_entity_type_id' => $entity_type_id,
                'target_bundle' => $bundle,
            ]);
        }
        return $config;
    }
    
    /**
     * {@inheritdoc}
     */
    public function calculateDependencies() {
        parent::calculateDependencies();
        // Create dependency on the bundle.
        $entity_type = \Drupal::entityTypeManager()->getDefinition($this->target_entity_type_id);
        $bundle_config_dependency = $entity_type->getBundleConfigDependency($this->target_bundle);
        $this->addDependency($bundle_config_dependency['type'], $bundle_config_dependency['name']);
        return $this;
    }
    
    /**
     * Returns all valid values for the `default_langcode` property.
     *
     * @return string[]
     *   All possible valid default langcodes. This includes all langcodes in the
     *   standard list of human languages, along with special langcodes like
     *   `site_default`, `current_interface` and `authors_default`.
     *
     * @see \Drupal\language\Element\LanguageConfiguration::getDefaultOptions()
     * @see \Drupal\Core\TypedData\Plugin\DataType\LanguageReference::getAllValidLangcodes()
     */
    public static function getAllValidDefaultLangcodes() : array {
        $language_manager = \Drupal::service('language_manager');
        return array_unique([
            array_keys($language_manager->getLanguages(LanguageInterface::STATE_ALL)),
            LanguageInterface::LANGCODE_SITE_DEFAULT,
            'current_interface',
            'authors_default',
        ]);
    }

}