<?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\PhpUnit;

use PhpCsFixer\Fixer\AbstractPhpUnitFixer;
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\Analyzer\DataProviderAnalyzer;
use PhpCsFixer\Tokenizer\FCT;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;

/**
 * @phpstan-type _AutogeneratedInputConfiguration array{
 *  prefix?: string,
 *  suffix?: string,
 * }
 * @phpstan-type _AutogeneratedComputedConfiguration array{
 *  prefix: string,
 *  suffix: string,
 * }
 *
 * @implements ConfigurableFixerInterface<_AutogeneratedInputConfiguration, _AutogeneratedComputedConfiguration>
 *
 * @author Kuba Werłos <werlos@gmail.com>
 *
 * @no-named-arguments Parameter names are not covered by the backward compatibility promise.
 */
final class PhpUnitDataProviderNameFixer extends AbstractPhpUnitFixer implements ConfigurableFixerInterface
{
    /** @use ConfigurableFixerTrait<_AutogeneratedInputConfiguration, _AutogeneratedComputedConfiguration> */
    use ConfigurableFixerTrait;

    public function getDefinition(): FixerDefinitionInterface
    {
        return new FixerDefinition(
            'Data provider names must match the name of the test.',
            [
                new CodeSample(
                    <<<'PHP'
                        <?php
                        class FooTest extends TestCase {
                            /**
                             * @dataProvider dataProvider
                             */
                            public function testSomething($expected, $actual) {}
                            public function dataProvider() {}
                        }

                        PHP,
                ),
                new CodeSample(
                    <<<'PHP'
                        <?php
                        class FooTest extends TestCase {
                            /**
                             * @dataProvider dt_prvdr_ftr
                             */
                            public function test_feature($expected, $actual) {}
                            public function dt_prvdr_ftr() {}
                        }

                        PHP,
                    [
                        'prefix' => 'data_',
                        'suffix' => '',
                    ],
                ),
                new CodeSample(
                    <<<'PHP'
                        <?php
                        class FooTest extends TestCase {
                            /**
                             * @dataProvider dataProviderUsedInMultipleTests
                             */
                            public function testA($expected, $actual) {}
                            /**
                             * @dataProvider dataProviderUsedInMultipleTests
                             */
                            public function testB($expected, $actual) {}
                            /**
                             * @dataProvider dataProviderUsedInSingleTest
                             */
                            public function testC($expected, $actual) {}
                            /**
                             * @dataProvider dataProviderUsedAsFirstInTest
                             * @dataProvider dataProviderUsedAsSecondInTest
                             */
                            public function testD($expected, $actual) {}

                            public function dataProviderUsedInMultipleTests() {}
                            public function dataProviderUsedInSingleTest() {}
                            public function dataProviderUsedAsFirstInTest() {}
                            public function dataProviderUsedAsSecondInTest() {}
                        }

                        PHP,
                    [
                        'prefix' => 'provides',
                        'suffix' => 'Data',
                    ],
                ),
            ],
            null,
            'Fixer could be risky if one is calling data provider by name as function.',
        );
    }

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

    protected function createConfigurationDefinition(): FixerConfigurationResolverInterface
    {
        return new FixerConfigurationResolver([
            (new FixerOptionBuilder('prefix', 'Prefix that replaces "test".'))
                ->setAllowedTypes(['string'])
                ->setDefault('provide')
                ->getOption(),
            (new FixerOptionBuilder('suffix', 'Suffix to be present at the end.'))
                ->setAllowedTypes(['string'])
                ->setDefault('Cases')
                ->getOption(),
        ]);
    }

    protected function applyPhpUnitClassFix(Tokens $tokens, int $startIndex, int $endIndex): void
    {
        $dataProviders = (new DataProviderAnalyzer())->getDataProviders($tokens, $startIndex, $endIndex);

        $methodsProviders = [];
        $providersMethods = [];
        foreach ($dataProviders as $dataProviderAnalysis) {
            foreach ($dataProviderAnalysis->getUsageIndices() as [$usageIndex]) {
                $methodIndex = $tokens->getNextTokenOfKind($usageIndex, [[\T_FUNCTION]]);
                $methodsProviders[$methodIndex][$dataProviderAnalysis->getName()] = $usageIndex;
                $providersMethods[$dataProviderAnalysis->getName()][$methodIndex] = $usageIndex;
            }
        }

        foreach ($dataProviders as $dataProviderAnalysis) {
            // @phpstan-ignore offsetAccess.notFound
            if (\count($providersMethods[$dataProviderAnalysis->getName()]) > 1) {
                continue;
            }

            $methodIndex = $tokens->getNextTokenOfKind($dataProviderAnalysis->getUsageIndices()[0][0], [[\T_FUNCTION]]);
            // @phpstan-ignore offsetAccess.notFound
            if (\count($methodsProviders[$methodIndex]) > 1) {
                continue;
            }

            $dataProviderNewName = $this->getDataProviderNameForUsageIndex($tokens, $methodIndex);
            if (null !== $tokens->findSequence([[\T_FUNCTION], [\T_STRING, $dataProviderNewName]], $startIndex, $endIndex)) {
                continue;
            }

            foreach ($dataProviderAnalysis->getUsageIndices() as [$usageIndex]) {
                $tokens[$dataProviderAnalysis->getNameIndex()] = new Token([\T_STRING, $dataProviderNewName]);

                $newContent = $tokens[$usageIndex]->isGivenKind(\T_DOC_COMMENT)
                    ? Preg::replace(
                        \sprintf('/(@dataProvider\s+)%s/', $dataProviderAnalysis->getName()),
                        \sprintf('$1%s', $dataProviderNewName),
                        $tokens[$usageIndex]->getContent(),
                    )
                    : \sprintf('%1$s%2$s%1$s', $tokens[$usageIndex]->getContent()[0], $dataProviderNewName);

                $tokens[$usageIndex] = new Token([$tokens[$usageIndex]->getId(), $newContent]);
            }
        }
    }

    private function getDataProviderNameForUsageIndex(Tokens $tokens, int $index): string
    {
        do {
            if ($tokens[$index]->isGivenKind(FCT::T_ATTRIBUTE)) {
                $index = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_ATTRIBUTE, $index);
            }
            $index = $tokens->getNextMeaningfulToken($index);
        } while (!$tokens[$index]->isGivenKind(\T_STRING));

        $name = $tokens[$index]->getContent();

        $name = Preg::replace('/^test_*/i', '', $name);

        if ('' === $this->configuration['prefix']) {
            $name = lcfirst($name);
        } elseif ('_' !== substr($this->configuration['prefix'], -1)) {
            $name = ucfirst($name);
        }

        return $this->configuration['prefix'].$name.$this->configuration['suffix'];
    }
}
