<?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\ControlStructure;

use PhpCsFixer\AbstractFixer;
use PhpCsFixer\Fixer\ConfigurableFixerInterface;
use PhpCsFixer\FixerConfiguration\AllowedValueSubset;
use PhpCsFixer\FixerConfiguration\FixerConfigurationResolver;
use PhpCsFixer\FixerConfiguration\FixerConfigurationResolverInterface;
use PhpCsFixer\FixerConfiguration\FixerOptionBuilder;
use PhpCsFixer\FixerConfiguration\InvalidOptionsForEnvException;
use PhpCsFixer\FixerDefinition\CodeSample;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
use PhpCsFixer\FixerDefinition\VersionSpecification;
use PhpCsFixer\FixerDefinition\VersionSpecificCodeSample;
use PhpCsFixer\Tokenizer\CT;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;
use PhpCsFixer\Tokenizer\TokensAnalyzer;
use Symfony\Component\OptionsResolver\Options;

/**
 * @author Sebastiaan Stok <s.stok@rollerscapes.net>
 * @author Dariusz Rumiński <dariusz.ruminski@gmail.com>
 * @author Kuba Werłos <werlos@gmail.com>
 */
final class TrailingCommaInMultilineFixer extends AbstractFixer implements ConfigurableFixerInterface
{
    /**
     * @internal
     */
    public const ELEMENTS_ARRAYS = 'arrays';

    /**
     * @internal
     */
    public const ELEMENTS_ARGUMENTS = 'arguments';

    /**
     * @internal
     */
    public const ELEMENTS_PARAMETERS = 'parameters';

    /**
     * {@inheritdoc}
     */
    public function getDefinition(): FixerDefinitionInterface
    {
        return new FixerDefinition(
            'Multi-line arrays, arguments list and parameters list must have a trailing comma.',
            [
                new CodeSample("<?php\narray(\n    1,\n    2\n);\n"),
                new VersionSpecificCodeSample(
                    <<<'SAMPLE'
<?php
    $x = [
        'foo',
        <<<EOD
            bar
            EOD
    ];

SAMPLE
                    ,
                    new VersionSpecification(70300),
                    ['after_heredoc' => true]
                ),
                new VersionSpecificCodeSample("<?php\nfoo(\n    1,\n    2\n);\n", new VersionSpecification(70300), ['elements' => [self::ELEMENTS_ARGUMENTS]]),
                new VersionSpecificCodeSample("<?php\nfunction foo(\n    \$x,\n    \$y\n)\n{\n}\n", new VersionSpecification(80000), ['elements' => [self::ELEMENTS_PARAMETERS]]),
            ]
        );
    }

    /**
     * {@inheritdoc}
     *
     * Must run after NoMultilineWhitespaceAroundDoubleArrowFixer.
     */
    public function getPriority(): int
    {
        return 0;
    }

    /**
     * {@inheritdoc}
     */
    public function isCandidate(Tokens $tokens): bool
    {
        return $tokens->isAnyTokenKindsFound([T_ARRAY, CT::T_ARRAY_SQUARE_BRACE_OPEN, '(']);
    }

    /**
     * {@inheritdoc}
     */
    protected function createConfigurationDefinition(): FixerConfigurationResolverInterface
    {
        return new FixerConfigurationResolver([
            (new FixerOptionBuilder('after_heredoc', 'Whether a trailing comma should also be placed after heredoc end.'))
                ->setAllowedTypes(['bool'])
                ->setDefault(false)
                ->setNormalizer(static function (Options $options, $value) {
                    if (\PHP_VERSION_ID < 70300 && $value) {
                        throw new InvalidOptionsForEnvException('"after_heredoc" option can only be enabled with PHP 7.3+.');
                    }

                    return $value;
                })
                ->getOption(),
            (new FixerOptionBuilder('elements', sprintf('Where to fix multiline trailing comma (PHP >= 7.3 required for `%s`, PHP >= 8.0 for `%s`).', self::ELEMENTS_ARGUMENTS, self::ELEMENTS_PARAMETERS)))
                ->setAllowedTypes(['array'])
                ->setAllowedValues([new AllowedValueSubset([self::ELEMENTS_ARRAYS, self::ELEMENTS_ARGUMENTS, self::ELEMENTS_PARAMETERS])])
                ->setDefault([self::ELEMENTS_ARRAYS])
                ->setNormalizer(static function (Options $options, $value) {
                    if (\PHP_VERSION_ID < 70300 && \in_array(self::ELEMENTS_ARGUMENTS, $value, true)) {
                        throw new InvalidOptionsForEnvException(sprintf('"%s" option can only be enabled with PHP 7.3+.', self::ELEMENTS_ARGUMENTS));
                    }

                    if (\PHP_VERSION_ID < 80000 && \in_array(self::ELEMENTS_PARAMETERS, $value, true)) {
                        throw new InvalidOptionsForEnvException(sprintf('"%s" option can only be enabled with PHP 8.0+.', self::ELEMENTS_PARAMETERS));
                    }

                    return $value;
                })
                ->getOption(),
        ]);
    }

    /**
     * {@inheritdoc}
     */
    protected function applyFix(\SplFileInfo $file, Tokens $tokens): void
    {
        $fixArrays = \in_array(self::ELEMENTS_ARRAYS, $this->configuration['elements'], true);
        $fixArguments = \in_array(self::ELEMENTS_ARGUMENTS, $this->configuration['elements'], true);
        $fixParameters = \in_array(self::ELEMENTS_PARAMETERS, $this->configuration['elements'], true);

        for ($index = $tokens->count() - 1; $index >= 0; --$index) {
            $prevIndex = $tokens->getPrevMeaningfulToken($index);

            if (
                $fixArrays
                && (
                    $tokens[$index]->equals('(') && $tokens[$prevIndex]->isGivenKind(T_ARRAY) // long syntax
                    || $tokens[$index]->isGivenKind(CT::T_ARRAY_SQUARE_BRACE_OPEN) // short syntax
                )
            ) {
                $this->fixBlock($tokens, $index);

                continue;
            }

            if (!$tokens[$index]->equals('(')) {
                continue;
            }

            $prevPrevIndex = $tokens->getPrevMeaningfulToken($prevIndex);

            if ($fixArguments
                && $tokens[$prevIndex]->equalsAny([']', [T_CLASS], [T_STRING], [T_VARIABLE]])
                && !$tokens[$prevPrevIndex]->isGivenKind(T_FUNCTION)
            ) {
                $this->fixBlock($tokens, $index);

                continue;
            }

            if (
                $fixParameters
                && (
                    $tokens[$prevIndex]->isGivenKind(T_STRING) && $tokens[$prevPrevIndex]->isGivenKind(T_FUNCTION)
                    || $tokens[$prevIndex]->isGivenKind([T_FN, T_FUNCTION])
                )
            ) {
                $this->fixBlock($tokens, $index);
            }
        }
    }

    private function fixBlock(Tokens $tokens, int $startIndex): void
    {
        $tokensAnalyzer = new TokensAnalyzer($tokens);

        if (!$tokensAnalyzer->isBlockMultiline($tokens, $startIndex)) {
            return;
        }

        $blockType = Tokens::detectBlockType($tokens[$startIndex]);
        $endIndex = $tokens->findBlockEnd($blockType['type'], $startIndex);

        $beforeEndIndex = $tokens->getPrevMeaningfulToken($endIndex);
        $beforeEndToken = $tokens[$beforeEndIndex];

        // if there is some item between braces then add `,` after it
        if (
            $startIndex !== $beforeEndIndex && !$beforeEndToken->equals(',')
            && (true === $this->configuration['after_heredoc'] || !$beforeEndToken->isGivenKind(T_END_HEREDOC))
        ) {
            $tokens->insertAt($beforeEndIndex + 1, new Token(','));

            $endToken = $tokens[$endIndex];

            if (!$endToken->isComment() && !$endToken->isWhitespace()) {
                $tokens->ensureWhitespaceAtIndex($endIndex, 1, ' ');
            }
        }
    }
}
