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);
    }

}