class ConfigTest

class ConfigTest extends ConfigEntityBase implements ConfigTestInterface {
    
    /**
     * The machine name for the configuration entity.
     *
     * @var string
     */
    protected $id;
    
    /**
     * The human-readable name of the configuration entity.
     *
     * @var string
     */
    public $label;
    
    /**
     * The weight of the configuration entity.
     *
     * @var int
     */
    public $weight = 0;
    
    /**
     * The image style to use.
     *
     * @var string
     */
    public $style;
    
    /**
     * A protected property of the configuration entity.
     *
     * @var string
     */
    protected $protected_property;
    
    /**
     * An array property of the configuration entity.
     *
     * @var array
     */
    protected array $array_property = [];
    
    /**
     * {@inheritdoc}
     */
    public static function sort(ConfigEntityInterface $a, ConfigEntityInterface $b) {
        \Drupal::state()->set('config_entity_sort', TRUE);
        return parent::sort($a, $b);
    }
    
    /**
     * {@inheritdoc}
     */
    public function postSave(EntityStorageInterface $storage, $update = TRUE) {
        // Used to test secondary writes during config sync.
        if ($this->id() == 'primary') {
            $secondary = $storage->create([
                'id' => 'secondary',
                'label' => 'Secondary Default',
            ]);
            $secondary->save();
        }
        if ($this->id() == 'dependency') {
            $dependent = $storage->load('dependent');
            $dependent->delete();
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public static function postDelete(EntityStorageInterface $storage, array $entities) {
        parent::postDelete($storage, $entities);
        foreach ($entities as $entity) {
            if ($entity->id() == 'dependency') {
                $dependent = $storage->load('dependent');
                $dependent->delete();
            }
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function calculateDependencies() {
        parent::calculateDependencies();
        if ($module = \Drupal::state()->get('config_test_new_dependency', FALSE)) {
            $this->addDependency('module', $module);
        }
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function onDependencyRemoval(array $dependencies) {
        // Record which entities have this method called on and what dependencies
        // are passed.
        $called = \Drupal::state()->get('config_test.on_dependency_removal_called', []);
        $called[$this->id()] = $dependencies;
        $called[$this->id()]['config'] = array_keys($called[$this->id()]['config']);
        $called[$this->id()]['content'] = array_keys($called[$this->id()]['content']);
        \Drupal::state()->set('config_test.on_dependency_removal_called', $called);
        $changed = parent::onDependencyRemoval($dependencies);
        if (!isset($this->dependencies['enforced']['config'])) {
            return $changed;
        }
        $fix_deps = \Drupal::state()->get('config_test.fix_dependencies', []);
        foreach ($dependencies['config'] as $entity) {
            if (in_array($entity->getConfigDependencyName(), $fix_deps)) {
                $key = array_search($entity->getConfigDependencyName(), $this->dependencies['enforced']['config']);
                if ($key !== FALSE) {
                    $changed = TRUE;
                    unset($this->dependencies['enforced']['config'][$key]);
                }
            }
        }
        // If any of the dependencies removed still exists, return FALSE.
        if (array_intersect_key(array_flip($this->dependencies['enforced']['config']), $dependencies['config'])) {
            return FALSE;
        }
        return $changed;
    }
    
    /**
     * Sets the enforced dependencies.
     *
     * @param array $dependencies
     *   A config dependency array.
     *
     * @return $this
     *
     * @see \Drupal\Core\Config\Entity\ConfigDependencyManager
     */
    public function setEnforcedDependencies(array $dependencies) {
        $this->dependencies['enforced'] = $dependencies;
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function isInstallable() {
        return $this->id != 'is_installable' || \Drupal::state()->get('config_test.is_installable');
    }
    
    /**
     * Sets the protected property value.
     *
     * @param $value
     *   The value to set.
     *
     * @return $this
     *   The config entity.
     */
    public function setProtectedProperty(string $value) : static {
        $this->protected_property = $value;
        return $this;
    }
    
    /**
     * Gets the protected property value.
     *
     * @return string
     *   The protected property value.
     */
    public function getProtectedProperty() : string {
        return $this->protected_property;
    }
    
    /**
     * Concatenates the two params and sets the protected property value.
     *
     * @param $value1
     *   The first value to concatenate.
     * @param $value2
     *   The second value to concatenate.
     *
     * @return $this
     *   The config entity.
     */
    public function concatProtectedProperty(string $value1, string $value2) : static {
        $this->protected_property = $value1 . $value2;
        return $this;
    }
    
    /**
     * Concatenates up to two params and sets the protected property value.
     *
     * @param $value1
     *   The first value to concatenate.
     * @param $value2
     *   (optional) The second value to concatenate. Defaults to ''.
     *
     * @return $this
     *   The config entity.
     */
    public function concatProtectedPropertyOptional(string $value1, string $value2 = '') : static {
        $this->protected_property = $value1 . $value2;
        return $this;
    }
    
    /**
     * Appends to protected property.
     *
     * @param $value
     *   The value to append.
     *
     * @return $this
     *   The config entity.
     */
    public function append(string $value) : static {
        $this->protected_property .= $value;
        return $this;
    }
    
    /**
     * Sets the protected property to a default value.
     *
     * @return $this
     *   The config entity.
     */
    public function defaultProtectedProperty() : static {
        $this->protected_property = 'Set by method';
        return $this;
    }
    
    /**
     * Adds a value to the array property.
     *
     * @param mixed $value
     *   The value to add.
     *
     * @return $this
     *   The config entity.
     */
    public function addToArray(mixed $value) : static {
        $this->array_property[] = $value;
        return $this;
    }
    
    /**
     * Gets the array property value.
     *
     * @return array
     *   The array property value.
     */
    public function getArrayProperty() : array {
        return $this->array_property;
    }
    
    /**
     * Sets the array property.
     *
     * @param $value
     *   The value to set.
     *
     * @return $this
     *   The config entity.
     */
    public function setArray(array $value) : static {
        $this->array_property = $value;
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function toArray() {
        $properties = parent::toArray();
        // Only export the 'array_property' is there is data.
        if (empty($properties['array_property'])) {
            unset($properties['array_property']);
        }
        return $properties;
    }

}