<?php

declare(strict_types=1);

/*
 * This file is part of PHP CS Fixer.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *     Dariusz Rumiński <dariusz.ruminski@gmail.com>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

namespace PhpCsFixer\Console\Report\ListSetsReport;

use Symfony\Component\Finder\Finder as SymfonyFinder;

/**
 * @author Boris Gorbylev <ekho@ekho.name>
 *
 * @internal
 */
final class ReporterFactory
{
    /**
     * @var array<string, ReporterInterface>
     */
    private array $reporters = [];

    public function registerBuiltInReporters(): self
    {
        /** @var null|list<string> $builtInReporters */
        static $builtInReporters;

        if (null === $builtInReporters) {
            $builtInReporters = [];

            foreach (SymfonyFinder::create()->files()->name('*Reporter.php')->in(__DIR__) as $file) {
                $relativeNamespace = $file->getRelativePath();
                $builtInReporters[] = sprintf(
                    '%s\\%s%s',
                    __NAMESPACE__,
                    '' !== $relativeNamespace ? $relativeNamespace.'\\' : '',
                    $file->getBasename('.php')
                );
            }
        }

        foreach ($builtInReporters as $reporterClass) {
            $this->registerReporter(new $reporterClass());
        }

        return $this;
    }

    public function registerReporter(ReporterInterface $reporter): self
    {
        $format = $reporter->getFormat();

        if (isset($this->reporters[$format])) {
            throw new \UnexpectedValueException(sprintf('Reporter for format "%s" is already registered.', $format));
        }

        $this->reporters[$format] = $reporter;

        return $this;
    }

    /**
     * @return list<string>
     */
    public function getFormats(): array
    {
        $formats = array_keys($this->reporters);
        sort($formats);

        return $formats;
    }

    public function getReporter(string $format): ReporterInterface
    {
        if (!isset($this->reporters[$format])) {
            throw new \UnexpectedValueException(sprintf('Reporter for format "%s" is not registered.', $format));
        }

        return $this->reporters[$format];
    }
}