<?php

declare(strict_types=1);


namespace phpDocumentor\Reflection;

use InvalidArgumentException;
use function assert;
use function end;
use function explode;
use function is_string;
use function preg_match;
use function sprintf;
use function trim;


final class Fqsen
{
    
    private $fqsen;

    
    private $name;

    
    public function __construct(string $fqsen)
    {
        $matches = [];

        $result = preg_match(
            
            '/^\\\\([a-zA-Z_\\x7f-\\xff][a-zA-Z0-9_\\x7f-\\xff\\\\]*)?(?:[:]{2}\\$?([a-zA-Z_\\x7f-\\xff][a-zA-Z0-9_\\x7f-\\xff]*))?(?:\\(\\))?$/',
            $fqsen,
            $matches
        );

        if ($result === 0) {
            throw new InvalidArgumentException(
                sprintf('"%s" is not a valid Fqsen.', $fqsen)
            );
        }

        $this->fqsen = $fqsen;

        if (isset($matches[2])) {
            $this->name = $matches[2];
        } else {
            $matches = explode('\\', $fqsen);
            $name = end($matches);
            assert(is_string($name));
            $this->name = trim($name, '()');
        }
    }

    
    public function __toString() : string
    {
        return $this->fqsen;
    }

    
    public function getName() : string
    {
        return $this->name;
    }
}