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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\Basic;

use PhpCsFixer\AbstractFixer;
use PhpCsFixer\DocBlock\TypeExpression;
use PhpCsFixer\Fixer\ConfigurableFixerInterface;
use PhpCsFixer\Fixer\ConfigurableFixerTrait;
use PhpCsFixer\FixerConfiguration\FixerConfigurationResolver;
use PhpCsFixer\FixerConfiguration\FixerConfigurationResolverInterface;
use PhpCsFixer\FixerConfiguration\FixerOptionBuilder;
use PhpCsFixer\FixerDefinition\FileSpecificCodeSample;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
use PhpCsFixer\Preg;
use PhpCsFixer\StdinFileInfo;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;
use PhpCsFixer\Tokenizer\TokensAnalyzer;

/**
 * @author Jordi Boggiano <[email protected]>
 * @author Dariusz Rumiński <[email protected]>
 * @author Bram Gotink <[email protected]>
 * @author Graham Campbell <[email protected]>
 * @author Kuba Werłos <[email protected]>
 *
 * @implements ConfigurableFixerInterface<_AutogeneratedInputConfiguration, _AutogeneratedComputedConfiguration>
 *
 * @phpstan-type _AutogeneratedInputConfiguration array{
 *  dir?: null|string
 * }
 * @phpstan-type _AutogeneratedComputedConfiguration array{
 *  dir: null|string
 * }
 */
final class PsrAutoloadingFixer extends AbstractFixer implements ConfigurableFixerInterface
{
    /** @use ConfigurableFixerTrait<_AutogeneratedInputConfiguration, _AutogeneratedComputedConfiguration> */
    use ConfigurableFixerTrait;

    public function getDefinition(): FixerDefinitionInterface
    {
        return new FixerDefinition(
            'Classes must be in a path that matches their namespace, be at least one namespace deep and the class name should match the file name.',
            [
                new FileSpecificCodeSample(
                    '<?php
namespace PhpCsFixer\FIXER\Basic;
class InvalidName {}
',
                    new \SplFileInfo(__FILE__)
                ),
                new FileSpecificCodeSample(
                    '<?php
namespace PhpCsFixer\FIXER\Basic;
class InvalidName {}
',
                    new \SplFileInfo(__FILE__),
                    ['dir' => './src']
                ),
            ],
            null,
            'This fixer may change your class name, which will break the code that depends on the old name.'
        );
    }

    public function isCandidate(Tokens $tokens): bool
    {
        return $tokens->isAnyTokenKindsFound(Token::getClassyTokenKinds());
    }

    public function isRisky(): bool
    {
        return true;
    }

    /**
     * {@inheritdoc}
     *
     * Must run before SelfAccessorFixer.
     */
    public function getPriority(): int
    {
        return -10;
    }

    public function supports(\SplFileInfo $file): bool
    {
        if ($file instanceof StdinFileInfo) {
            return false;
        }

        if (
            // ignore file with extension other than php
            ('php' !== $file->getExtension())
            // ignore file with name that cannot be a class name
            || !Preg::match('/^'.TypeExpression::REGEX_IDENTIFIER.'$/', $file->getBasename('.php'))
        ) {
            return false;
        }

        try {
            $tokens = Tokens::fromCode(\sprintf('<?php class %s {}', $file->getBasename('.php')));

            if ($tokens[3]->isKeyword() || $tokens[3]->isMagicConstant()) {
                // name cannot be a class name - detected by PHP 5.x
                return false;
            }
        } catch (\ParseError $e) {
            // name cannot be a class name - detected by PHP 7.x
            return false;
        }

        // ignore stubs/fixtures, since they typically contain invalid files for various reasons
        return !Preg::match('{[/\\\](stub|fixture)s?[/\\\]}i', $file->getRealPath());
    }

    protected function configurePostNormalisation(): void
    {
        if (null !== $this->configuration['dir']) {
            $realpath = realpath($this->configuration['dir']);

            if (false === $realpath) {
                throw new \InvalidArgumentException(\sprintf('Failed to resolve configured directory "%s".', $this->configuration['dir']));
            }

            $this->configuration['dir'] = $realpath;
        }
    }

    protected function createConfigurationDefinition(): FixerConfigurationResolverInterface
    {
        return new FixerConfigurationResolver([
            (new FixerOptionBuilder('dir', 'If provided, the directory where the project code is placed.'))
                ->setAllowedTypes(['null', 'string'])
                ->setDefault(null)
                ->getOption(),
        ]);
    }

    protected function applyFix(\SplFileInfo $file, Tokens $tokens): void
    {
        $tokenAnalyzer = new TokensAnalyzer($tokens);

        if (null !== $this->configuration['dir'] && !str_starts_with($file->getRealPath(), $this->configuration['dir'])) {
            return;
        }

        $namespace = null;
        $namespaceStartIndex = null;
        $namespaceEndIndex = null;

        $classyName = null;
        $classyIndex = null;

        foreach ($tokens as $index => $token) {
            if ($token->isGivenKind(T_NAMESPACE)) {
                if (null !== $namespace) {
                    return;
                }

                $namespaceStartIndex = $tokens->getNextMeaningfulToken($index);
                $namespaceEndIndex = $tokens->getNextTokenOfKind($namespaceStartIndex, [';']);
                $namespace = trim($tokens->generatePartialCode($namespaceStartIndex, $namespaceEndIndex - 1));
            } elseif ($token->isClassy()) {
                if ($tokenAnalyzer->isAnonymousClass($index)) {
                    continue;
                }

                if (null !== $classyName) {
                    return;
                }

                $classyIndex = $tokens->getNextMeaningfulToken($index);
                $classyName = $tokens[$classyIndex]->getContent();
            }
        }

        if (null === $classyName) {
            return;
        }

        $expectedClassyName = $this->calculateClassyName($file, $namespace, $classyName);

        if ($classyName !== $expectedClassyName) {
            $tokens[$classyIndex] = new Token([T_STRING, $expectedClassyName]);
        }

        if (null === $this->configuration['dir'] || null === $namespace) {
            return;
        }

        if (!is_dir($this->configuration['dir'])) {
            return;
        }

        $configuredDir = realpath($this->configuration['dir']);
        $fileDir = \dirname($file->getRealPath());

        if (\strlen($configuredDir) >= \strlen($fileDir)) {
            return;
        }

        $newNamespace = substr(str_replace('/', '\\', $fileDir), \strlen($configuredDir) + 1);
        $originalNamespace = substr($namespace, -\strlen($newNamespace));

        if ($originalNamespace !== $newNamespace && strtolower($originalNamespace) === strtolower($newNamespace)) {
            $tokens->clearRange($namespaceStartIndex, $namespaceEndIndex);
            $namespace = substr($namespace, 0, -\strlen($newNamespace)).$newNamespace;

            $newNamespace = Tokens::fromCode('<?php namespace '.$namespace.';');
            $newNamespace->clearRange(0, 2);
            $newNamespace->clearEmptyTokens();

            $tokens->insertAt($namespaceStartIndex, $newNamespace);
        }
    }

    private function calculateClassyName(\SplFileInfo $file, ?string $namespace, string $currentName): string
    {
        $name = $file->getBasename('.php');
        $maxNamespace = $this->calculateMaxNamespace($file, $namespace);

        if (null !== $this->configuration['dir']) {
            return ('' !== $maxNamespace ? (str_replace('\\', '_', $maxNamespace).'_') : '').$name;
        }

        $namespaceParts = array_reverse(explode('\\', $maxNamespace));

        foreach ($namespaceParts as $namespacePart) {
            $nameCandidate = \sprintf('%s_%s', $namespacePart, $name);

            if (strtolower($nameCandidate) !== strtolower(substr($currentName, -\strlen($nameCandidate)))) {
                break;
            }

            $name = $nameCandidate;
        }

        return $name;
    }

    private function calculateMaxNamespace(\SplFileInfo $file, ?string $namespace): string
    {
        if (null === $this->configuration['dir']) {
            $root = \dirname($file->getRealPath());

            while ($root !== \dirname($root)) {
                $root = \dirname($root);
            }
        } else {
            $root = realpath($this->configuration['dir']);
        }

        $namespaceAccordingToFileLocation = trim(str_replace(\DIRECTORY_SEPARATOR, '\\', substr(\dirname($file->getRealPath()), \strlen($root))), '\\');

        if (null === $namespace) {
            return $namespaceAccordingToFileLocation;
        }

        $namespaceAccordingToFileLocationPartsReversed = array_reverse(explode('\\', $namespaceAccordingToFileLocation));
        $namespacePartsReversed = array_reverse(explode('\\', $namespace));

        foreach ($namespacePartsReversed as $key => $namespaceParte) {
            if (!isset($namespaceAccordingToFileLocationPartsReversed[$key])) {
                break;
            }

            if (strtolower($namespaceParte) !== strtolower($namespaceAccordingToFileLocationPartsReversed[$key])) {
                break;
            }

            unset($namespaceAccordingToFileLocationPartsReversed[$key]);
        }

        return implode('\\', array_reverse($namespaceAccordingToFileLocationPartsReversed));
    }
}