class Target

final class Target {
  public const TARGET_CLASS = 1;
  public const TARGET_METHOD = 2;
  public const TARGET_PROPERTY = 4;
  public const TARGET_ANNOTATION = 8;
  public const TARGET_FUNCTION = 16;
  public const TARGET_ALL = 31;
  /** @var array<string, int> */
  private static $map = [
    'ALL' => self::TARGET_ALL,
    'CLASS' => self::TARGET_CLASS,
    'METHOD' => self::TARGET_METHOD,
    'PROPERTY' => self::TARGET_PROPERTY,
    'FUNCTION' => self::TARGET_FUNCTION,
    'ANNOTATION' => self::TARGET_ANNOTATION,
  ];
  /** @phpstan-var list<string> */
  public $value;
  
  /**
   * Targets as bitmask.
   *
   * @var int
   */
  public $targets;
  
  /**
   * Literal target declaration.
   *
   * @var string
   */
  public $literal;
  
  /**
   * @phpstan-param array{value?: string|list<string>} $values
   *
   * @throws InvalidArgumentException
   */
  public function __construct(array $values) {
    if (!isset($values['value'])) {
      $values['value'] = null;
    }
    if (is_string($values['value'])) {
      $values['value'] = [
        $values['value'],
      ];
    }
    if (!is_array($values['value'])) {
      throw new InvalidArgumentException(sprintf('@Target expects either a string value, or an array of strings, "%s" given.', is_object($values['value']) ? get_class($values['value']) : gettype($values['value'])));
    }
    $bitmask = 0;
    foreach ($values['value'] as $literal) {
      if (!isset(self::$map[$literal])) {
        throw new InvalidArgumentException(sprintf('Invalid Target "%s". Available targets: [%s]', $literal, implode(', ', array_keys(self::$map))));
      }
      $bitmask |= self::$map[$literal];
    }
    $this->targets = $bitmask;
    $this->value = $values['value'];
    $this->literal = implode(', ', $this->value);
  }

}