class ArgumentMetadataFactory

final class ArgumentMetadataFactory implements ArgumentMetadataFactoryInterface {
    public function createArgumentMetadata(string|object|array $controller, ?\ReflectionFunctionAbstract $reflector = null) : array {
        $arguments = [];
        $reflector ??= new \ReflectionFunction($controller(...));
        $controllerName = $this->getPrettyName($reflector);
        foreach ($reflector->getParameters() as $param) {
            $attributes = [];
            foreach ($param->getAttributes() as $reflectionAttribute) {
                if (class_exists($reflectionAttribute->getName())) {
                    $attributes[] = $reflectionAttribute->newInstance();
                }
            }
            $arguments[] = new ArgumentMetadata($param->getName(), $this->getType($param), $param->isVariadic(), $param->isDefaultValueAvailable(), $param->isDefaultValueAvailable() ? $param->getDefaultValue() : null, $param->allowsNull(), $attributes, $controllerName);
        }
        return $arguments;
    }
    
    /**
     * Returns an associated type to the given parameter if available.
     */
    private function getType(\ReflectionParameter $parameter) : ?string {
        if (!($type = $parameter->getType())) {
            return null;
        }
        $name = $type instanceof \ReflectionNamedType ? $type->getName() : (string) $type;
        return match (strtolower($name)) {    'self' => $parameter->getDeclaringClass()?->name,
            'parent' => get_parent_class($parameter->getDeclaringClass()?->name ?? '') ?: null,
            default => $name,
        
        };
    }
    private function getPrettyName(\ReflectionFunctionAbstract $r) : string {
        $name = $r->name;
        if ($r instanceof \ReflectionMethod) {
            return $r->class . '::' . $name;
        }
        if ($r->isAnonymous() || !($class = $r->getClosureCalledClass())) {
            return $name;
        }
        return $class->name . '::' . $name;
    }

}