class ComponentMetadata

class ComponentMetadata {
    use StringTranslationTrait;
    
    /**
     * The absolute path to the component directory.
     *
     * @var string
     */
    public readonly string $path;
    
    /**
     * The component documentation.
     *
     * @var string
     */
    public readonly string $documentation;
    
    /**
     * The status of the component.
     *
     * @var string
     */
    public readonly string $status;
    
    /**
     * The machine name for the component.
     *
     * @var string
     */
    public readonly string $machineName;
    
    /**
     * The component's name.
     *
     * @var string
     */
    public readonly string $name;
    
    /**
     * The PNG path for the component thumbnail.
     *
     * @var string
     */
    private string $thumbnailPath;
    
    /**
     * The component group.
     *
     * @var string
     */
    public readonly string $group;
    
    /**
     * Schema for the component props.
     *
     * @var array[]|null
     *   The schemas.
     */
    public readonly ?array $schema;
    
    /**
     * The component description.
     *
     * @var string
     */
    public readonly string $description;
    
    /**
     * TRUE if the schemas for props and slots are mandatory.
     *
     * @var bool
     */
    public readonly bool $mandatorySchemas;
    
    /**
     * Slot information.
     *
     * @var array
     */
    public readonly array $slots;
    
    /**
     * ComponentMetadata constructor.
     *
     * @param array $metadata_info
     *   The metadata info.
     * @param string $app_root
     *   The application root.
     * @param bool $enforce_schemas
     *   Enforces the definition of schemas for props and slots.
     *
     * @throws \Drupal\Core\Render\Component\Exception\InvalidComponentException
     */
    public function __construct(array $metadata_info, string $app_root, bool $enforce_schemas) {
        $path = $metadata_info['path'];
        // Make the absolute path, relative to the Drupal root.
        $app_root = rtrim($app_root, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR;
        if (str_starts_with($path, $app_root)) {
            $path = substr($path, strlen($app_root));
        }
        $this->mandatorySchemas = $enforce_schemas;
        $this->path = $path;
        [
            ,
            $machine_name,
        ] = explode(':', $metadata_info['id'] ?? []);
        $this->machineName = $machine_name;
        $this->name = $metadata_info['name'] ?? mb_convert_case($machine_name, MB_CASE_TITLE);
        $this->description = $metadata_info['description'] ?? $this->t('- Description not available -');
        $this->status = ExtensionLifecycle::isValid($metadata_info['status'] ?? '') ? $metadata_info['status'] : ExtensionLifecycle::STABLE;
        $this->documentation = $metadata_info['documentation'] ?? '';
        $this->group = $metadata_info['group'] ?? $this->t('All Components');
        // Save the schemas.
        $this->parseSchemaInfo($metadata_info);
        $this->slots = $metadata_info['slots'] ?? [];
    }
    
    /**
     * Parse the schema information.
     *
     * @param array $metadata_info
     *   The metadata information as decoded from the component definition file.
     *
     * @throws \Drupal\Core\Render\Component\Exception\InvalidComponentException
     */
    private function parseSchemaInfo(array $metadata_info) : void {
        if (empty($metadata_info['props'])) {
            if ($this->mandatorySchemas) {
                throw new InvalidComponentException(sprintf('The component "%s" does not provide schema information. Schema definitions are mandatory for components declared in modules. For components declared in themes, schema definitions are only mandatory if the "enforce_prop_schemas" key is set to "true" in the theme info file.', $metadata_info['id']));
            }
            $schema = NULL;
        }
        else {
            $schema = $metadata_info['props'];
            if (($schema['type'] ?? 'object') !== 'object') {
                throw new InvalidComponentException('The schema for the props in the component metadata is invalid. The schema should be of type "object".');
            }
            if ($schema['additionalProperties'] ?? FALSE) {
                throw new InvalidComponentException('The schema for the %s in the component metadata is invalid. Arbitrary additional properties are not allowed.');
            }
            $schema['additionalProperties'] = FALSE;
            // All props should also support "object" this allows deferring rendering
            // in Twig to the render pipeline.
            $schema_props = $metadata_info['props'];
            foreach ($schema_props['properties'] ?? [] as $name => $prop_schema) {
                $type = $prop_schema['type'] ?? '';
                $schema['properties'][$name]['type'] = array_unique([
                    (array) $type,
                    'object',
                ]);
            }
        }
        $this->schema = $schema;
    }
    
    /**
     * Gets the thumbnail path.
     *
     * @return string
     *   The path.
     */
    public function getThumbnailPath() : string {
        if (!isset($this->thumbnailPath)) {
            $thumbnail_path = sprintf('%s/thumbnail.png', $this->path);
            $this->thumbnailPath = file_exists($thumbnail_path) ? $thumbnail_path : '';
        }
        return $this->thumbnailPath;
    }
    
    /**
     * Normalizes the value object.
     *
     * @return array
     *   The normalized value object.
     */
    public function normalize() : array {
        return [
            'path' => $this->path,
            'machineName' => $this->machineName,
            'status' => $this->status,
            'name' => $this->name,
            'group' => $this->group,
        ];
    }

}