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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\PhpUnit;

use PhpCsFixer\DocBlock\DocBlock;
use PhpCsFixer\DocBlock\Line;
use PhpCsFixer\Fixer\AbstractPhpUnitFixer;
use PhpCsFixer\Fixer\ConfigurableFixerInterface;
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\Token;
use PhpCsFixer\Tokenizer\Tokens;
use PhpCsFixer\Tokenizer\TokensAnalyzer;
use PhpCsFixer\Utils;

/**
 * @author Filippo Tessarotto <[email protected]>
 */
final class PhpUnitMethodCasingFixer extends AbstractPhpUnitFixer implements ConfigurableFixerInterface
{
    /**
     * @internal
     */
    public const CAMEL_CASE = 'camel_case';

    /**
     * @internal
     */
    public const SNAKE_CASE = 'snake_case';

    public function getDefinition(): FixerDefinitionInterface
    {
        return new FixerDefinition(
            'Enforce camel (or snake) case for PHPUnit test methods, following configuration.',
            [
                new CodeSample(
                    '<?php
class MyTest extends \\PhpUnit\\FrameWork\\TestCase
{
    public function test_my_code() {}
}
'
                ),
                new CodeSample(
                    '<?php
class MyTest extends \\PhpUnit\\FrameWork\\TestCase
{
    public function testMyCode() {}
}
',
                    ['case' => self::SNAKE_CASE]
                ),
            ]
        );
    }

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

    protected function createConfigurationDefinition(): FixerConfigurationResolverInterface
    {
        return new FixerConfigurationResolver([
            (new FixerOptionBuilder('case', 'Apply camel or snake case to test methods.'))
                ->setAllowedValues([self::CAMEL_CASE, self::SNAKE_CASE])
                ->setDefault(self::CAMEL_CASE)
                ->getOption(),
        ]);
    }

    protected function applyPhpUnitClassFix(Tokens $tokens, int $startIndex, int $endIndex): void
    {
        for ($index = $endIndex - 1; $index > $startIndex; --$index) {
            if (!$this->isTestMethod($tokens, $index)) {
                continue;
            }

            $functionNameIndex = $tokens->getNextMeaningfulToken($index);
            $functionName = $tokens[$functionNameIndex]->getContent();
            $newFunctionName = $this->updateMethodCasing($functionName);

            if ($newFunctionName !== $functionName) {
                $tokens[$functionNameIndex] = new Token([T_STRING, $newFunctionName]);
            }

            $docBlockIndex = $this->getDocBlockIndex($tokens, $index);

            if ($this->isPHPDoc($tokens, $docBlockIndex)) {
                $this->updateDocBlock($tokens, $docBlockIndex);
            }
        }
    }

    private function updateMethodCasing(string $functionName): string
    {
        $parts = explode('::', $functionName);

        $functionNamePart = array_pop($parts);

        if (self::CAMEL_CASE === $this->configuration['case']) {
            $newFunctionNamePart = $functionNamePart;
            $newFunctionNamePart = ucwords($newFunctionNamePart, '_');
            $newFunctionNamePart = str_replace('_', '', $newFunctionNamePart);
            $newFunctionNamePart = lcfirst($newFunctionNamePart);
        } else {
            $newFunctionNamePart = Utils::camelCaseToUnderscore($functionNamePart);
        }

        $parts[] = $newFunctionNamePart;

        return implode('::', $parts);
    }

    private function isTestMethod(Tokens $tokens, int $index): bool
    {
        // Check if we are dealing with a (non-abstract, non-lambda) function
        if (!$this->isMethod($tokens, $index)) {
            return false;
        }

        // if the function name starts with test it's a test
        $functionNameIndex = $tokens->getNextMeaningfulToken($index);
        $functionName = $tokens[$functionNameIndex]->getContent();

        if (str_starts_with($functionName, 'test')) {
            return true;
        }

        $docBlockIndex = $this->getDocBlockIndex($tokens, $index);

        return
            $this->isPHPDoc($tokens, $docBlockIndex) // If the function doesn't have test in its name, and no doc block, it's not a test
            && str_contains($tokens[$docBlockIndex]->getContent(), '@test');
    }

    private function isMethod(Tokens $tokens, int $index): bool
    {
        $tokensAnalyzer = new TokensAnalyzer($tokens);

        return $tokens[$index]->isGivenKind(T_FUNCTION) && !$tokensAnalyzer->isLambda($index);
    }

    private function updateDocBlock(Tokens $tokens, int $docBlockIndex): void
    {
        $doc = new DocBlock($tokens[$docBlockIndex]->getContent());
        $lines = $doc->getLines();

        $docBlockNeedsUpdate = false;
        for ($inc = 0; $inc < \count($lines); ++$inc) {
            $lineContent = $lines[$inc]->getContent();
            if (!str_contains($lineContent, '@depends')) {
                continue;
            }

            $newLineContent = Preg::replaceCallback('/(@depends\s+)(.+)(\b)/', fn (array $matches): string => sprintf(
                '%s%s%s',
                $matches[1],
                $this->updateMethodCasing($matches[2]),
                $matches[3]
            ), $lineContent);

            if ($newLineContent !== $lineContent) {
                $lines[$inc] = new Line($newLineContent);
                $docBlockNeedsUpdate = true;
            }
        }

        if ($docBlockNeedsUpdate) {
            $lines = implode('', $lines);
            $tokens[$docBlockIndex] = new Token([T_DOC_COMMENT, $lines]);
        }
    }
}