<?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\Fixer\Phpdoc;

use PhpCsFixer\AbstractFixer;
use PhpCsFixer\FixerDefinition\CodeSample;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
use PhpCsFixer\Preg;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;

/**
 * Fixer for part of rule defined in PSR5 ¶7.22.
 */
final class PhpdocSingleLineVarSpacingFixer extends AbstractFixer
{
    public function getDefinition(): FixerDefinitionInterface
    {
        return new FixerDefinition(
            'Single line `@var` PHPDoc should have proper spacing.',
            [new CodeSample("<?php /**@var   MyClass   \$a   */\n\$a = test();\n")]
        );
    }

    /**
     * {@inheritdoc}
     *
     * Must run before PhpdocAlignFixer.
     * Must run after AlignMultilineCommentFixer, CommentToPhpdocFixer, PhpdocIndentFixer, PhpdocNoAliasTagFixer, PhpdocScalarFixer, PhpdocToCommentFixer, PhpdocTypesFixer.
     */
    public function getPriority(): int
    {
        return -10;
    }

    public function isCandidate(Tokens $tokens): bool
    {
        return $tokens->isAnyTokenKindsFound([T_COMMENT, T_DOC_COMMENT]);
    }

    protected function applyFix(\SplFileInfo $file, Tokens $tokens): void
    {
        /** @var Token $token */
        foreach ($tokens as $index => $token) {
            if (!$token->isComment()) {
                continue;
            }

            $content = $token->getContent();
            $fixedContent = $this->fixTokenContent($content);

            if ($content !== $fixedContent) {
                $tokens[$index] = new Token([T_DOC_COMMENT, $fixedContent]);
            }
        }
    }

    private function fixTokenContent(string $content): string
    {
        return Preg::replaceCallback(
            '#^/\*\*\h*@var\h+(\S+)\h*(\$\S+)?\h*([^\n]*)\*/$#',
            static function (array $matches) {
                $content = '/** @var';

                for ($i = 1, $m = \count($matches); $i < $m; ++$i) {
                    if ('' !== $matches[$i]) {
                        $content .= ' '.$matches[$i];
                    }
                }

                return rtrim($content).' */';
            },
            $content
        );
    }
}