<?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\DocBlock\DocBlock;
use PhpCsFixer\FixerDefinition\CodeSample;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
use PhpCsFixer\Preg;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;

/**
 * @author Dariusz Rumiński <dariusz.ruminski@gmail.com>
 */
final class PhpdocAnnotationWithoutDotFixer extends AbstractFixer
{
    /**
     * @var list<string>
     */
    private array $tags = ['throws', 'return', 'param', 'internal', 'deprecated', 'var', 'type'];

    public function getDefinition(): FixerDefinitionInterface
    {
        return new FixerDefinition(
            'PHPDoc annotation descriptions should not be a sentence.',
            [new CodeSample('<?php
/**
 * @param string $bar Some string.
 */
function foo ($bar) {}
')]
        );
    }

    /**
     * {@inheritdoc}
     *
     * Must run before PhpdocAlignFixer.
     * Must run after AlignMultilineCommentFixer, CommentToPhpdocFixer, PhpdocIndentFixer, PhpdocToCommentFixer.
     */
    public function getPriority(): int
    {
        return 17;
    }

    public function isCandidate(Tokens $tokens): bool
    {
        return $tokens->isTokenKindFound(T_DOC_COMMENT);
    }

    protected function applyFix(\SplFileInfo $file, Tokens $tokens): void
    {
        foreach ($tokens as $index => $token) {
            if (!$token->isGivenKind(T_DOC_COMMENT)) {
                continue;
            }

            $doc = new DocBlock($token->getContent());
            $annotations = $doc->getAnnotations();

            if (0 === \count($annotations)) {
                continue;
            }

            foreach ($annotations as $annotation) {
                if (
                    !$annotation->getTag()->valid() || !\in_array($annotation->getTag()->getName(), $this->tags, true)
                ) {
                    continue;
                }

                $lineAfterAnnotation = $doc->getLine($annotation->getEnd() + 1);
                if (null !== $lineAfterAnnotation) {
                    $lineAfterAnnotationTrimmed = ltrim($lineAfterAnnotation->getContent());
                    if ('' === $lineAfterAnnotationTrimmed || !str_starts_with($lineAfterAnnotationTrimmed, '*')) {
                        // malformed PHPDoc, missing asterisk !
                        continue;
                    }
                }

                $content = $annotation->getContent();

                if (
                    !Preg::match('/[.。]\h*$/u', $content)
                    || Preg::match('/[.。](?!\h*$)/u', $content, $matches)
                ) {
                    continue;
                }

                $endLine = $doc->getLine($annotation->getEnd());
                $endLine->setContent(Preg::replace('/(?<![.。])[.。]\h*(\H+)$/u', '\1', $endLine->getContent()));

                $startLine = $doc->getLine($annotation->getStart());
                $optionalTypeRegEx = $annotation->supportTypes()
                    ? \sprintf('(?:%s\s+(?:\$\w+\s+)?)?', preg_quote(implode('|', $annotation->getTypes()), '/'))
                    : '';
                $content = Preg::replaceCallback(
                    '/^(\s*\*\s*@\w+\s+'.$optionalTypeRegEx.')(\p{Lu}?(?=\p{Ll}|\p{Zs}))(.*)$/',
                    static fn (array $matches): string => $matches[1].mb_strtolower($matches[2]).$matches[3],
                    $startLine->getContent(),
                    1
                );
                $startLine->setContent($content);
            }

            $tokens[$index] = new Token([T_DOC_COMMENT, $doc->getContent()]);
        }
    }
}
