<?php

/*
 * 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\Annotation;
use PhpCsFixer\DocBlock\DocBlock;
use PhpCsFixer\Fixer\ConfigurationDefinitionFixerInterface;
use PhpCsFixer\FixerConfiguration\FixerConfigurationResolver;
use PhpCsFixer\FixerConfiguration\FixerOptionBuilder;
use PhpCsFixer\FixerDefinition\CodeSample;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\Preg;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;
use PhpCsFixer\Utils;

final class PhpdocTypesOrderFixer extends AbstractFixer implements ConfigurationDefinitionFixerInterface
{
    /**
     * {@inheritdoc}
     */
    public function getDefinition()
    {
        return new FixerDefinition(
            'Sorts PHPDoc types.',
            [
                new CodeSample(
                    '<?php
/**
 * @param string|null $bar
 */
'
                ),
                new CodeSample(
                    '<?php
/**
 * @param null|string $bar
 */
',
                    ['null_adjustment' => 'always_last']
                ),
                new CodeSample(
                    '<?php
/**
 * @param null|string|int|\Foo $bar
 */
',
                    ['sort_algorithm' => 'alpha']
                ),
                new CodeSample(
                    '<?php
/**
 * @param null|string|int|\Foo $bar
 */
',
                    [
                        'sort_algorithm' => 'alpha',
                        'null_adjustment' => 'always_last',
                    ]
                ),
                new CodeSample(
                    '<?php
/**
 * @param null|string|int|\Foo $bar
 */
',
                    [
                        'sort_algorithm' => 'alpha',
                        'null_adjustment' => 'none',
                    ]
                ),
            ]
        );
    }

    /**
     * {@inheritdoc}
     */
    public function isCandidate(Tokens $tokens)
    {
        return $tokens->isTokenKindFound(T_DOC_COMMENT);
    }

    /**
     * {@inheritdoc}
     */
    protected function createConfigurationDefinition()
    {
        return new FixerConfigurationResolver([
            (new FixerOptionBuilder('sort_algorithm', 'The sorting algorithm to apply.'))
                ->setAllowedValues(['alpha', 'none'])
                ->setDefault('alpha')
                ->getOption(),
            (new FixerOptionBuilder('null_adjustment', 'Forces the position of `null` (overrides `sort_algorithm`).'))
                ->setAllowedValues(['always_first', 'always_last', 'none'])
                ->setDefault('always_first')
                ->getOption(),
        ]);
    }

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

            $doc = new DocBlock($token->getContent());
            $annotations = $doc->getAnnotationsOfType(Annotation::getTagsWithTypes());

            if (!\count($annotations)) {
                continue;
            }

            foreach ($annotations as $annotation) {
                $types = $annotation->getTypes();

                // fix main types
                $annotation->setTypes($this->sortTypes($types));

                // fix @method parameters types
                $line = $doc->getLine($annotation->getStart());
                $line->setContent(Preg::replaceCallback('/(@method\s+.+?\s+\w+\()(.*)\)/', function (array $matches) {
                    $sorted = Preg::replaceCallback('/([^\s,]+)([\s]+\$[^\s,]+)/', function (array $matches) {
                        return $this->sortJoinedTypes($matches[1]).$matches[2];
                    }, $matches[2]);

                    return $matches[1].$sorted.')';
                }, $line->getContent()));
            }

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

    /**
     * @param string[] $types
     *
     * @return string[]
     */
    private function sortTypes(array $types)
    {
        foreach ($types as $index => $type) {
            $types[$index] = Preg::replaceCallback('/^([^<]+)<(?:([\w\|]+?)(,\s*))?(.*)>$/', function (array $matches) {
                return $matches[1].'<'.$this->sortJoinedTypes($matches[2]).$matches[3].$this->sortJoinedTypes($matches[4]).'>';
            }, $type);
        }

        if ('alpha' === $this->configuration['sort_algorithm']) {
            $types = Utils::stableSort(
                $types,
                static function ($type) { return $type; },
                static function ($typeA, $typeB) {
                    $regexp = '/^\\??\\\?/';

                    return strcasecmp(
                        Preg::replace($regexp, '', $typeA),
                        Preg::replace($regexp, '', $typeB)
                    );
                }
            );
        }

        if ('none' !== $this->configuration['null_adjustment']) {
            $nulls = [];
            foreach ($types as $index => $type) {
                if (Preg::match('/^\\\?null$/i', $type)) {
                    $nulls[$index] = $type;
                    unset($types[$index]);
                }
            }

            if (\count($nulls)) {
                if ('always_last' === $this->configuration['null_adjustment']) {
                    array_push($types, ...$nulls);
                } else {
                    array_unshift($types, ...$nulls);
                }
            }
        }

        return $types;
    }

    /**
     * @param string $types
     *
     * @return string
     */
    private function sortJoinedTypes($types)
    {
        $types = array_filter(
            Preg::split('/([^|<]+(?:<.*>)?)/', $types, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY),
            static function ($value) {
                return '|' !== $value;
            }
        );

        return implode('|', $this->sortTypes($types));
    }
}
