class ArgumentMetadata

class ArgumentMetadata {
    public const IS_INSTANCEOF = 2;
    
    /**
     * @param object[] $attributes
     */
    public function __construct(string $name, ?string $type, bool $isVariadic, bool $hasDefaultValue, mixed $defaultValue, bool $isNullable = false, array $attributes = [], string $controllerName = 'n/a') {
        $this->isNullable = $isNullable || null === $type || $hasDefaultValue && null === $defaultValue;
    }
    
    /**
     * Returns the name as given in PHP, $foo would yield "foo".
     */
    public function getName() : string {
        return $this->name;
    }
    
    /**
     * Returns the type of the argument.
     *
     * The type is the PHP class in 5.5+ and additionally the basic type in PHP 7.0+.
     */
    public function getType() : ?string {
        return $this->type;
    }
    
    /**
     * Returns whether the argument is defined as "...$variadic".
     */
    public function isVariadic() : bool {
        return $this->isVariadic;
    }
    
    /**
     * Returns whether the argument has a default value.
     *
     * Implies whether an argument is optional.
     */
    public function hasDefaultValue() : bool {
        return $this->hasDefaultValue;
    }
    
    /**
     * Returns whether the argument accepts null values.
     */
    public function isNullable() : bool {
        return $this->isNullable;
    }
    
    /**
     * Returns the default value of the argument.
     *
     * @throws \LogicException if no default value is present; {@see self::hasDefaultValue()}
     */
    public function getDefaultValue() : mixed {
        if (!$this->hasDefaultValue) {
            throw new \LogicException(\sprintf('Argument $%s does not have a default value. Use "%s::hasDefaultValue()" to avoid this exception.', $this->name, __CLASS__));
        }
        return $this->defaultValue;
    }
    
    /**
     * @param class-string          $name
     * @param self::IS_INSTANCEOF|0 $flags
     *
     * @return array<object>
     */
    public function getAttributes(?string $name = null, int $flags = 0) : array {
        if (!$name) {
            return $this->attributes;
        }
        return $this->getAttributesOfType($name, $flags);
    }
    
    /**
     * @template T of object
     *
     * @param class-string<T>       $name
     * @param self::IS_INSTANCEOF|0 $flags
     *
     * @return array<T>
     */
    public function getAttributesOfType(string $name, int $flags = 0) : array {
        $attributes = [];
        if ($flags & self::IS_INSTANCEOF) {
            foreach ($this->attributes as $attribute) {
                if ($attribute instanceof $name) {
                    $attributes[] = $attribute;
                }
            }
        }
        else {
            foreach ($this->attributes as $attribute) {
                if ($attribute::class === $name) {
                    $attributes[] = $attribute;
                }
            }
        }
        return $attributes;
    }
    public function getControllerName() : string {
        return $this->controllerName;
    }

}