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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\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\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;
use Symfony\Component\OptionsResolver\Exception\InvalidOptionsException;

/**
 * @author Graham Campbell <[email protected]>
 * @author Jakub Kwaśniewski <[email protected]>
 *
 * @implements ConfigurableFixerInterface<_AutogeneratedInputConfiguration, _AutogeneratedComputedConfiguration>
 *
 * @phpstan-type _AutogeneratedInputConfiguration array{
 *  order?: list<string>
 * }
 * @phpstan-type _AutogeneratedComputedConfiguration array{
 *  order: list<string>
 * }
 */
final class PhpdocOrderFixer extends AbstractFixer implements ConfigurableFixerInterface
{
    /** @use ConfigurableFixerTrait<_AutogeneratedInputConfiguration, _AutogeneratedComputedConfiguration> */
    use ConfigurableFixerTrait;

    /**
     * @const string[]
     *
     * @TODO: 4.0 - change default to ['param', 'return', 'throws']
     */
    private const ORDER_DEFAULT = ['param', 'throws', 'return'];

    public function getDefinition(): FixerDefinitionInterface
    {
        $code = <<<'EOF'
            <?php
            /**
             * Hello there!
             *
             * @throws Exception|RuntimeException foo
             * @custom Test!
             * @return int  Return the number of changes.
             * @param string $foo
             * @param bool   $bar Bar
             */

            EOF;

        return new FixerDefinition(
            'Annotations in PHPDoc should be ordered in defined sequence.',
            [
                new CodeSample($code),
                new CodeSample($code, ['order' => self::ORDER_DEFAULT]),
                new CodeSample($code, ['order' => ['param', 'return', 'throws']]),
                new CodeSample($code, ['order' => ['param', 'custom', 'throws', 'return']]),
            ],
        );
    }

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

    /**
     * {@inheritdoc}
     *
     * Must run before PhpdocAlignFixer, PhpdocSeparationFixer, PhpdocTrimFixer.
     * Must run after AlignMultilineCommentFixer, CommentToPhpdocFixer, PhpdocAddMissingParamAnnotationFixer, PhpdocIndentFixer, PhpdocNoEmptyReturnFixer, PhpdocScalarFixer, PhpdocToCommentFixer, PhpdocTypesFixer.
     */
    public function getPriority(): int
    {
        return -2;
    }

    protected function createConfigurationDefinition(): FixerConfigurationResolverInterface
    {
        return new FixerConfigurationResolver([
            (new FixerOptionBuilder('order', 'Sequence in which annotations in PHPDoc should be ordered.'))
                ->setAllowedTypes(['string[]'])
                ->setAllowedValues([static function (array $order): bool {
                    if (\count($order) < 2) {
                        throw new InvalidOptionsException('The option "order" value is invalid. Minimum two tags are required.');
                    }

                    return true;
                }])
                ->setDefault(self::ORDER_DEFAULT)
                ->getOption(),
        ]);
    }

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

            // assuming annotations are already grouped by tags
            $content = $token->getContent();

            // sort annotations
            /** @var list<string> */
            $successors = $this->configuration['order'];
            while (\count($successors) >= 3) {
                $predecessor = array_shift($successors);
                $content = $this->moveAnnotationsBefore($predecessor, $successors, $content);
            }

            // we're parsing the content last time to make sure the internal
            // state of the docblock is correct after the modifications
            /** @var list<string> */
            $predecessors = $this->configuration['order'];
            $last = array_pop($predecessors);
            $content = $this->moveAnnotationsAfter($last, $predecessors, $content);

            // persist the content at the end
            $tokens[$index] = new Token([T_DOC_COMMENT, $content]);
        }
    }

    /**
     * Move all given annotations in before given set of annotations.
     *
     * @param string       $move   Tag of annotations that should be moved
     * @param list<string> $before Tags of annotations that should moved annotations be placed before
     */
    private function moveAnnotationsBefore(string $move, array $before, string $content): string
    {
        $doc = new DocBlock($content);
        $toBeMoved = $doc->getAnnotationsOfType($move);

        // nothing to do if there are no annotations to be moved
        if (0 === \count($toBeMoved)) {
            return $content;
        }

        $others = $doc->getAnnotationsOfType($before);

        if (0 === \count($others)) {
            return $content;
        }

        // get the index of the final line of the final toBoMoved annotation
        $end = end($toBeMoved)->getEnd();

        $line = $doc->getLine($end);

        // move stuff about if required
        foreach ($others as $other) {
            if ($other->getStart() < $end) {
                // we're doing this to maintain the original line indices
                $line->setContent($line->getContent().$other->getContent());
                $other->remove();
            }
        }

        return $doc->getContent();
    }

    /**
     * Move all given annotations after given set of annotations.
     *
     * @param string       $move  Tag of annotations that should be moved
     * @param list<string> $after Tags of annotations that should moved annotations be placed after
     */
    private function moveAnnotationsAfter(string $move, array $after, string $content): string
    {
        $doc = new DocBlock($content);
        $toBeMoved = $doc->getAnnotationsOfType($move);

        // nothing to do if there are no annotations to be moved
        if (0 === \count($toBeMoved)) {
            return $content;
        }

        $others = $doc->getAnnotationsOfType($after);

        // nothing to do if there are no other annotations
        if (0 === \count($others)) {
            return $content;
        }

        // get the index of the first line of the first toBeMoved annotation
        $start = $toBeMoved[0]->getStart();
        $line = $doc->getLine($start);

        // move stuff about if required
        foreach (array_reverse($others) as $other) {
            if ($other->getEnd() > $start) {
                // we're doing this to maintain the original line indices
                $line->setContent($other->getContent().$line->getContent());
                $other->remove();
            }
        }

        return $doc->getContent();
    }
}