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<?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\ClassNotation;

use PhpCsFixer\AbstractFixer;
use PhpCsFixer\ConfigurationException\InvalidFixerConfigurationException;
use PhpCsFixer\DocBlock\DocBlock;
use PhpCsFixer\Fixer\ConfigurableFixerInterface;
use PhpCsFixer\Fixer\ConfigurableFixerTrait;
use PhpCsFixer\FixerConfiguration\FixerConfigurationResolver;
use PhpCsFixer\FixerConfiguration\FixerConfigurationResolverInterface;
use PhpCsFixer\FixerConfiguration\FixerOptionBuilder;
use PhpCsFixer\FixerDefinition\CodeSample;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
use PhpCsFixer\Preg;
use PhpCsFixer\Tokenizer\CT;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;
use PhpCsFixer\Tokenizer\TokensAnalyzer;
use PhpCsFixer\Utils;
use Symfony\Component\OptionsResolver\Options;

/**
 * @author Dariusz Rumiński <dariusz.ruminski@gmail.com>
 *
 * @implements ConfigurableFixerInterface<_AutogeneratedInputConfiguration, _AutogeneratedComputedConfiguration>
 *
 * @phpstan-type _AutogeneratedInputConfiguration array{
 *  annotation_exclude?: list<string>,
 *  annotation_include?: list<string>,
 *  consider_absent_docblock_as_internal_class?: bool,
 *  exclude?: list<string>,
 *  include?: list<string>
 * }
 * @phpstan-type _AutogeneratedComputedConfiguration array{
 *  annotation_exclude: array<string, string>,
 *  annotation_include: array<string, string>,
 *  consider_absent_docblock_as_internal_class: bool,
 *  exclude: array<string, string>,
 *  include: array<string, string>
 * }
 */
final class FinalInternalClassFixer extends AbstractFixer implements ConfigurableFixerInterface
{
    /** @use ConfigurableFixerTrait<_AutogeneratedInputConfiguration, _AutogeneratedComputedConfiguration> */
    use ConfigurableFixerTrait;

private const DEFAULTS = [
        'include' => [
            'internal',
        ],
        'exclude' => [
            'final',
            'Entity',
            'ORM\Entity',
            'ORM\Mapping\Entity',
            'Mapping\Entity',
            'Document',
            'ODM\Document',
        ],
    ];

private bool $checkAttributes;

public function __construct()
    {
        parent::__construct();

$this->checkAttributes = \PHP_VERSION_ID >= 8_00_00;
    }

public function getDefinition(): FixerDefinitionInterface
    {
        return new FixerDefinition(
            'Internal classes should be `final`.',
            [
                new CodeSample("<?php\n/**\n * @internal\n */\nclass Sample\n{\n}\n"),
                new CodeSample(
                    "<?php\n/**\n * @CUSTOM\n */\nclass A{}\n\n/**\n * @CUSTOM\n * @not-fix\n */\nclass B{}\n",
                    [
                        'include' => ['@Custom'],
                        'exclude' => ['@not-fix'],
                    ]
                ),
            ],
            null,
            'Changing classes to `final` might cause code execution to break.'
        );
    }

/**
     * {@inheritdoc}
     *
     * Must run before ProtectedToPrivateFixer, SelfStaticAccessorFixer.
     * Must run after PhpUnitInternalClassFixer.
     */
    public function getPriority(): int
    {
        return 67;
    }

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

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

protected function configurePostNormalisation(): void
    {
        $this->assertConfigHasNoConflicts();
    }

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

for ($index = $tokens->count() - 1; 0 <= $index; --$index) {
            if (!$tokens[$index]->isGivenKind(T_CLASS) || !$this->isClassCandidate($tokensAnalyzer, $tokens, $index)) {
                continue;
            }

// make class 'final'
            $tokens->insertSlices([
                $index => [
                    new Token([T_FINAL, 'final']),
                    new Token([T_WHITESPACE, ' ']),
                ],
            ]);
        }
    }

protected function createConfigurationDefinition(): FixerConfigurationResolverInterface
    {
        $annotationsAsserts = [static function (array $values): bool {
            foreach ($values as $value) {
                if ('' === $value) {
                    return false;
                }
            }

return true;
        }];

$annotationsNormalizer = static function (Options $options, array $value): array {
            $newValue = [];
            foreach ($value as $key) {
                if (str_starts_with($key, '@')) {
                    $key = substr($key, 1);
                }

$newValue[strtolower($key)] = true;
            }

return $newValue;
        };

return new FixerConfigurationResolver([
            (new FixerOptionBuilder('annotation_include', 'Class level attribute or annotation tags that must be set in order to fix the class (case insensitive).'))
                ->setAllowedTypes(['string[]'])
                ->setAllowedValues($annotationsAsserts)
                ->setDefault(
                    array_map(
                        static fn (string $string) => '@'.$string,
                        self::DEFAULTS['include'],
                    ),
                )
                ->setNormalizer($annotationsNormalizer)
                ->setDeprecationMessage('Use `include` to configure PHPDoc annotations tags and attributes.')
                ->getOption(),
            (new FixerOptionBuilder('annotation_exclude', 'Class level attribute or annotation tags that must be omitted to fix the class, even if all of the white list ones are used as well (case insensitive).'))
                ->setAllowedTypes(['string[]'])
                ->setAllowedValues($annotationsAsserts)
                ->setDefault(
                    array_map(
                        static fn (string $string) => '@'.$string,
                        self::DEFAULTS['exclude'],
                    ),
                )
                ->setNormalizer($annotationsNormalizer)
                ->setDeprecationMessage('Use `exclude` to configure PHPDoc annotations tags and attributes.')
                ->getOption(),
            (new FixerOptionBuilder('include', 'Class level attribute or annotation tags that must be set in order to fix the class (case insensitive).'))
                ->setAllowedTypes(['string[]'])
                ->setAllowedValues($annotationsAsserts)
                ->setDefault(self::DEFAULTS['include'])
                ->setNormalizer($annotationsNormalizer)
                ->getOption(),
            (new FixerOptionBuilder('exclude', 'Class level attribute or annotation tags that must be omitted to fix the class, even if all of the white list ones are used as well (case insensitive).'))
                ->setAllowedTypes(['string[]'])
                ->setAllowedValues($annotationsAsserts)
                ->setDefault(self::DEFAULTS['exclude'])
                ->setNormalizer($annotationsNormalizer)
                ->getOption(),
            (new FixerOptionBuilder('consider_absent_docblock_as_internal_class', 'Whether classes without any DocBlock should be fixed to final.'))
                ->setAllowedTypes(['bool'])
                ->setDefault(false)
                ->getOption(),
        ]);
    }

/**
     * @param int $index T_CLASS index
     */
    private function isClassCandidate(TokensAnalyzer $tokensAnalyzer, Tokens $tokens, int $index): bool
    {
        if ($tokensAnalyzer->isAnonymousClass($index)) {
            return false;
        }

$modifiers = $tokensAnalyzer->getClassyModifiers($index);

if (isset($modifiers['final']) || isset($modifiers['abstract'])) {
            return false; // ignore class; it is abstract or already final
        }

$decisions = [];
        $currentIndex = $index;

$acceptTypes = [
            CT::T_ATTRIBUTE_CLOSE,
            T_DOC_COMMENT,
            T_COMMENT, // Skip comments
        ];

if (\defined('T_READONLY')) {
            // Skip readonly classes for PHP 8.2+
            $acceptTypes[] = T_READONLY;
        }

while ($currentIndex) {
            $currentIndex = $tokens->getPrevNonWhitespace($currentIndex);

if (!$tokens[$currentIndex]->isGivenKind($acceptTypes)) {
                break;
            }

if ($this->checkAttributes && $tokens[$currentIndex]->isGivenKind(CT::T_ATTRIBUTE_CLOSE)) {
                $attributeStartIndex = $tokens->findBlockStart(Tokens::BLOCK_TYPE_ATTRIBUTE, $currentIndex);
                $decisions[] = $this->isClassCandidateBasedOnAttribute($tokens, $attributeStartIndex, $currentIndex);

$currentIndex = $attributeStartIndex;
            }

if ($tokens[$currentIndex]->isGivenKind([T_DOC_COMMENT])) {
                $decisions[] = $this->isClassCandidateBasedOnPhpDoc($tokens, $currentIndex);
            }
        }

if (\in_array(false, $decisions, true)) {
            return false;
        }

return \in_array(true, $decisions, true)
            || ([] === $decisions && true === $this->configuration['consider_absent_docblock_as_internal_class']);
    }

private function isClassCandidateBasedOnPhpDoc(Tokens $tokens, int $index): ?bool
    {
        $doc = new DocBlock($tokens[$index]->getContent());
        $tags = [];

foreach ($doc->getAnnotations() as $annotation) {
            if (!Preg::match('/@([^\(\s]+)/', $annotation->getContent(), $matches)) {
                continue;
            }
            $tag = strtolower(substr(array_shift($matches), 1));

$tags[$tag] = true;
        }

if (\count(array_intersect_key($this->configuration['exclude'], $tags)) > 0) {
            return false;
        }

if ($this->isConfiguredAsInclude($tags)) {
            return true;
        }

return null;
    }

private function isClassCandidateBasedOnAttribute(Tokens $tokens, int $startIndex, int $endIndex): ?bool
    {
        $attributeCandidates = [];
        $attributeString = '';
        $currentIndex = $startIndex;

while ($currentIndex < $endIndex && null !== ($currentIndex = $tokens->getNextMeaningfulToken($currentIndex))) {
            if (!$tokens[$currentIndex]->isGivenKind([T_STRING, T_NS_SEPARATOR])) {
                if ('' !== $attributeString) {
                    $attributeCandidates[$attributeString] = true;
                    $attributeString = '';
                }

continue;
            }

$attributeString .= strtolower($tokens[$currentIndex]->getContent());
        }

if (\count(array_intersect_key($this->configuration['exclude'], $attributeCandidates)) > 0) {
            return false;
        }

if ($this->isConfiguredAsInclude($attributeCandidates)) {
            return true;
        }

return null;
    }

/**
     * @param array<string, bool> $attributes
     */
    private function isConfiguredAsInclude(array $attributes): bool
    {
        if (0 === \count($this->configuration['include'])) {
            return true;
        }

return \count(array_intersect_key($this->configuration['include'], $attributes)) > 0;
    }

private function assertConfigHasNoConflicts(): void
    {
        foreach (['include' => 'annotation_include', 'exclude' => 'annotation_exclude'] as $newConfigKey => $oldConfigKey) {
            $defaults = [];

foreach (self::DEFAULTS[$newConfigKey] as $foo) {
                $defaults[strtolower($foo)] = true;
            }

$newConfigIsSet = $this->configuration[$newConfigKey] !== $defaults;
            $oldConfigIsSet = $this->configuration[$oldConfigKey] !== $defaults;

if ($newConfigIsSet && $oldConfigIsSet) {
                throw new InvalidFixerConfigurationException($this->getName(), \sprintf('Configuration cannot contain deprecated option "%s" and new option "%s".', $oldConfigKey, $newConfigKey));
            }

if ($oldConfigIsSet) {
                $this->configuration[$newConfigKey] = $this->configuration[$oldConfigKey]; // @phpstan-ignore-line crazy mapping, to be removed while cleaning up deprecated options
                $this->checkAttributes = false; // run in old mode
            }

// if ($newConfigIsSet) - only new config is set, all good
            // if (!$newConfigIsSet && !$oldConfigIsSet) - both are set as to default values, all good

unset($this->configuration[$oldConfigKey]); // @phpstan-ignore-line crazy mapping, to be removed while cleaning up deprecated options
        }

$intersect = array_intersect_assoc($this->configuration['include'], $this->configuration['exclude']);

if (\count($intersect) > 0) {
            throw new InvalidFixerConfigurationException($this->getName(), \sprintf('Annotation cannot be used in both "include" and "exclude" list, got duplicates: %s.', Utils::naturalLanguageJoin(array_keys($intersect))));
        }
    }
}

✏️ Editing: FinalInternalClassFixer.php

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