<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\DependencyInjection\Attribute;

use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
use Symfony\Component\DependencyInjection\Exception\LogicException;

/**
 * An attribute to tell how a dependency is used and hint named autowiring aliases.
 *
 * @author Nicolas Grekas <p@tchwork.com>
 */
#[\Attribute(\Attribute::TARGET_PARAMETER)]
final class Target
{
    public function __construct(
        public ?string $name = null,
    ) {
    }

    public function getParsedName(): string
    {
        if (null === $this->name) {
            throw new LogicException(sprintf('Cannot parse the name of a #[Target] attribute that has not been resolved. Did you forget to call "%s::parseName()"?', __CLASS__));
        }

        return lcfirst(str_replace(' ', '', ucwords(preg_replace('/[^a-zA-Z0-9\x7f-\xff]++/', ' ', $this->name))));
    }

    public static function parseName(\ReflectionParameter $parameter, self &$attribute = null): string
    {
        $attribute = null;
        if (!$target = $parameter->getAttributes(self::class)[0] ?? null) {
            return $parameter->name;
        }

        $attribute = $target->newInstance();
        $name = $attribute->name ??= $parameter->name;
        $parsedName = $attribute->getParsedName();

        if (!preg_match('/^[a-zA-Z_\x7f-\xff]/', $parsedName)) {
            if (($function = $parameter->getDeclaringFunction()) instanceof \ReflectionMethod) {
                $function = $function->class.'::'.$function->name;
            } else {
                $function = $function->name;
            }

            throw new InvalidArgumentException(sprintf('Invalid #[Target] name "%s" on parameter "$%s" of "%s()": the first character must be a letter.', $name, $parameter->name, $function));
        }

        return $parsedName;
    }
}
