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<?php

declare(strict_types=1);

/*
 * This file is part of PHP CS Fixer.
 *
 * (c) Fabien Potencier <[email protected]>
 *     Dariusz Rumiński <[email protected]>
 *
 * 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\DocBlock\Line;
use PhpCsFixer\DocBlock\TypeExpression;
use PhpCsFixer\FixerDefinition\CodeSample;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
use PhpCsFixer\Preg;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;

/**
 * @author Graham Campbell <[email protected]>
 * @author Dave van der Brugge <[email protected]>
 */
final class PhpdocVarWithoutNameFixer extends AbstractFixer
{
    public function getDefinition(): FixerDefinitionInterface
    {
        return new FixerDefinition(
            '`@var` and `@type` annotations of classy properties should not contain the name.',
            [new CodeSample('<?php
final class Foo
{
    /**
     * @var int $bar
     */
    public $bar;

    /**
     * @type $baz float
     */
    public $baz;
}
')]
        );
    }

    /**
     * {@inheritdoc}
     *
     * Must run before PhpdocAlignFixer.
     * Must run after AlignMultilineCommentFixer, CommentToPhpdocFixer, PhpdocIndentFixer, PhpdocScalarFixer, PhpdocToCommentFixer, PhpdocTypesFixer.
     */
    public function getPriority(): int
    {
        return 0;
    }

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

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

            $nextIndex = $tokens->getNextMeaningfulToken($index);

            if (null === $nextIndex) {
                continue;
            }

            // For people writing "static public $foo" instead of "public static $foo"
            if ($tokens[$nextIndex]->isGivenKind(T_STATIC)) {
                $nextIndex = $tokens->getNextMeaningfulToken($nextIndex);
            }

            // We want only doc blocks that are for properties and thus have specified access modifiers next
            $propertyModifierKinds = [T_PRIVATE, T_PROTECTED, T_PUBLIC, T_VAR];

            if (\defined('T_READONLY')) { // @TODO: drop condition when PHP 8.1+ is required
                $propertyModifierKinds[] = T_READONLY;
            }

            if (!$tokens[$nextIndex]->isGivenKind($propertyModifierKinds)) {
                continue;
            }

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

            $firstLevelLines = $this->getFirstLevelLines($doc);
            $annotations = $doc->getAnnotationsOfType(['type', 'var']);

            foreach ($annotations as $annotation) {
                if (isset($firstLevelLines[$annotation->getStart()])) {
                    $this->fixLine($firstLevelLines[$annotation->getStart()]);
                }
            }

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

    private function fixLine(Line $line): void
    {
        Preg::matchAll('/ \$'.TypeExpression::REGEX_IDENTIFIER.'(?<!\$this)/', $line->getContent(), $matches);

        if (isset($matches[0])) {
            foreach ($matches[0] as $match) {
                $line->setContent(str_replace($match, '', $line->getContent()));
            }
        }
    }

    /**
     * @return Line[]
     */
    private function getFirstLevelLines(DocBlock $docBlock): array
    {
        $nested = 0;
        $lines = $docBlock->getLines();

        foreach ($lines as $index => $line) {
            $content = $line->getContent();

            if (Preg::match('/\s*\*\s*}$/', $content)) {
                --$nested;
            }

            if ($nested > 0) {
                unset($lines[$index]);
            }

            if (Preg::match('/\s\{$/', $content)) {
                ++$nested;
            }
        }

        return $lines;
    }
}