<?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\DocBlock\Annotation;
use PhpCsFixer\DocBlock\DocBlock;
use PhpCsFixer\Fixer\AbstractPhpUnitFixer;
use PhpCsFixer\Fixer\AttributeNotation\OrderedAttributesFixer;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
use PhpCsFixer\FixerDefinition\VersionSpecification;
use PhpCsFixer\FixerDefinition\VersionSpecificCodeSample;
use PhpCsFixer\Preg;
use PhpCsFixer\Tokenizer\Analyzer\AttributeAnalyzer;
use PhpCsFixer\Tokenizer\CT;
use PhpCsFixer\Tokenizer\Processor\ImportProcessor;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;

/**
 * @author Kuba Werłos <werlos@gmail.com>
 */
final class PhpUnitAttributesFixer extends AbstractPhpUnitFixer
{
    /** @var array<string, string> */
    private array $fixingMap;

    public function __construct()
    {
        parent::__construct();
        $this->prepareFixingMap();
    }

    public function getDefinition(): FixerDefinitionInterface
    {
        return new FixerDefinition(
            'PHPUnit attributes must be used over their respective PHPDoc-based annotations.',
            [
                new VersionSpecificCodeSample(
                    <<<'PHP'
                        <?php
                        /**
                         * @covers \VendorName\Foo
                         * @internal
                         */
                        final class FooTest extends TestCase {
                            /**
                             * @param int $expected
                             * @param int $actual
                             * @dataProvider giveMeSomeData
                             * @requires PHP 8.0
                             */
                            public function testSomething($expected, $actual) {}
                        }

                        PHP,
                    new VersionSpecification(8_00_00),
                ),
            ],
        );
    }

    public function isCandidate(Tokens $tokens): bool
    {
        return \PHP_VERSION_ID >= 8_00_00 && parent::isCandidate($tokens);
    }

    /**
     * {@inheritdoc}
     *
     * Must run before FullyQualifiedStrictTypesFixer, PhpdocSeparationFixer, PhpdocTrimConsecutiveBlankLineSeparationFixer, PhpdocTrimFixer.
     */
    public function getPriority(): int
    {
        return 8;
    }

    protected function applyPhpUnitClassFix(Tokens $tokens, int $startIndex, int $endIndex): void
    {
        $classIndex = $tokens->getPrevTokenOfKind($startIndex, [[T_CLASS]]);
        $docBlockIndex = $this->getDocBlockIndex($tokens, $classIndex);
        if ($tokens[$docBlockIndex]->isGivenKind(T_DOC_COMMENT)) {
            $startIndex = $docBlockIndex;
        }

        for ($index = $endIndex; $index >= $startIndex; --$index) {
            if (!$tokens[$index]->isGivenKind(T_DOC_COMMENT)) {
                continue;
            }

            $targetIndex = $tokens->getTokenNotOfKindSibling(
                $index,
                1,
                [[T_ABSTRACT], [T_COMMENT], [T_FINAL], [T_FUNCTION], [T_PRIVATE], [T_PROTECTED], [T_PUBLIC], [T_STATIC], [T_WHITESPACE]],
            );
            $annotationScope = $tokens[$targetIndex]->isGivenKind(T_CLASS) ? 'class' : 'method';

            $docBlock = new DocBlock($tokens[$index]->getContent());

            foreach (array_reverse($docBlock->getAnnotations()) as $annotation) {
                $annotationName = $annotation->getTag()->getName();

                if (!isset($this->fixingMap[$annotationName])) {
                    continue;
                }
                if (!self::shouldBeFixed($annotationName, $annotationScope)) {
                    continue;
                }

                /** @phpstan-ignore-next-line */
                $tokensToInsert = self::{$this->fixingMap[$annotationName]}($tokens, $index, $annotation);

                if (self::isAttributeAlreadyPresent($tokens, $index, $tokensToInsert)) {
                    continue;
                }

                if ([] === $tokensToInsert) {
                    continue;
                }

                $tokens->insertSlices([$index + 1 => $tokensToInsert]);
                $annotation->remove();
            }

            if ('' === $docBlock->getContent()) {
                $tokens->clearTokenAndMergeSurroundingWhitespace($index);
            } else {
                $tokens[$index] = new Token([T_DOC_COMMENT, $docBlock->getContent()]);
            }
        }
    }

    private function prepareFixingMap(): void
    {
        // annotations that map to attribute without parameters
        foreach ([
            'after',
            'afterClass',
            'before',
            'beforeClass',
            'coversNothing',
            'doesNotPerformAssertions',
            'large',
            'medium',
            'runInSeparateProcess',
            'runTestsInSeparateProcesses',
            'small',
            'test',
            'preCondition',
            'postCondition',
        ] as $annotation) {
            $this->fixingMap[$annotation] = 'fixWithoutParameters';
        }

        // annotations that map to attribute with single string value
        foreach (['group', 'testDox', 'ticket'] as $annotation) {
            $this->fixingMap[$annotation] = 'fixWithSingleStringValue';
        }

        // annotations that map from 'enabled'/'disabled' value to attribute with boolean value
        foreach (['backupGlobals', 'backupStaticAttributes', 'preserveGlobalState'] as $annotation) {
            $this->fixingMap[$annotation] = 'fixWithEnabledDisabledValue';
        }

        // annotations that has custom mapping function
        $this->fixingMap['covers'] = 'fixCovers';
        $this->fixingMap['dataProvider'] = 'fixDataProvider';
        $this->fixingMap['depends'] = 'fixDepends';
        $this->fixingMap['requires'] = 'fixRequires';
        $this->fixingMap['testWith'] = 'fixTestWith';
        $this->fixingMap['uses'] = 'fixUses';
    }

    private static function shouldBeFixed(string $annotationName, string $annotationScope): bool
    {
        if (
            'method' === $annotationScope
            && \in_array($annotationName, ['covers', 'large', 'medium', 'runTestsInSeparateProcesses', 'small', 'uses'], true)
        ) {
            return false;
        }

        if (
            'class' === $annotationScope
            && \in_array($annotationName, ['after', 'afterClass', 'before', 'beforeClass', 'dataProvider', 'depends', 'postCondition', 'preCondition', 'runInSeparateProcess', 'test', 'testWith'], true)
        ) {
            return false;
        }

        return true;
    }

    /**
     * @param list<Token> $tokensToInsert
     */
    private static function isAttributeAlreadyPresent(Tokens $tokens, int $index, array $tokensToInsert): bool
    {
        $attributeIndex = $tokens->getNextMeaningfulToken($index);
        if (!$tokens[$attributeIndex]->isGivenKind(T_ATTRIBUTE)) {
            return false;
        }

        $insertedClassName = '';
        foreach (\array_slice($tokensToInsert, 3) as $token) {
            if ($token->equals('(') || $token->isGivenKind(CT::T_ATTRIBUTE_CLOSE)) {
                break;
            }
            $insertedClassName .= $token->getContent();
        }

        // @TODO: refactor OrderedAttributesFixer::determineAttributeFullyQualifiedName to shared analyzer
        static $determineAttributeFullyQualifiedName = null;
        static $orderedAttributesFixer = null;
        if (null === $determineAttributeFullyQualifiedName) {
            $orderedAttributesFixer = new OrderedAttributesFixer();
            $reflection = new \ReflectionObject($orderedAttributesFixer);
            $determineAttributeFullyQualifiedName = $reflection->getMethod('determineAttributeFullyQualifiedName');
            $determineAttributeFullyQualifiedName->setAccessible(true);
        }

        foreach (AttributeAnalyzer::collect($tokens, $attributeIndex) as $attributeAnalysis) {
            foreach ($attributeAnalysis->getAttributes() as $attribute) {
                $className = ltrim($determineAttributeFullyQualifiedName->invokeArgs(
                    $orderedAttributesFixer,
                    [$tokens,
                        $attribute['name'],
                        $attribute['start']],
                ), '\\');

                if ($insertedClassName === $className) {
                    return true;
                }
            }
        }

        return false;
    }

    /**
     * @return list<Token>
     */
    private static function fixWithoutParameters(Tokens $tokens, int $index, Annotation $annotation): array
    {
        return self::createAttributeTokens($tokens, $index, self::getAttributeNameForAnnotation($annotation));
    }

    /**
     * @return list<Token>
     */
    private static function fixWithSingleStringValue(Tokens $tokens, int $index, Annotation $annotation): array
    {
        Preg::match(
            sprintf('/@%s\s+(.*\S)(?:\R|\s*\*+\/$)/', $annotation->getTag()->getName()),
            $annotation->getContent(),
            $matches,
        );
        if (!isset($matches[1])) {
            return [];
        }

        return self::createAttributeTokens(
            $tokens,
            $index,
            self::getAttributeNameForAnnotation($annotation),
            self::createEscapedStringToken($matches[1]),
        );
    }

    /**
     * @return list<Token>
     */
    private static function fixWithEnabledDisabledValue(Tokens $tokens, int $index, Annotation $annotation): array
    {
        $matches = self::getMatches($annotation);
        if (!isset($matches[1])) {
            return [];
        }

        return self::createAttributeTokens(
            $tokens,
            $index,
            self::getAttributeNameForAnnotation($annotation),
            new Token([T_STRING, isset($matches[1]) && 'enabled' === $matches[1] ? 'true' : 'false']),
        );
    }

    /**
     * @return list<Token>
     */
    private static function fixCovers(Tokens $tokens, int $index, Annotation $annotation): array
    {
        $matches = self::getMatches($annotation);

        if (str_starts_with($matches[1], '::')) {
            return self::createAttributeTokens($tokens, $index, 'CoversFunction', self::createEscapedStringToken(substr($matches[1], 2)));
        }
        if (!str_contains($matches[1], '::')) {
            return self::createAttributeTokens(
                $tokens,
                $index,
                'CoversClass',
                ...self::toClassConstant($matches[1]),
            );
        }

        return [];
    }

    /**
     * @return list<Token>
     */
    private static function fixDataProvider(Tokens $tokens, int $index, Annotation $annotation): array
    {
        $matches = self::getMatches($annotation);
        if (!isset($matches[1])) {
            return [];
        }

        if (str_contains($matches[1], '::')) {
            [$class, $method] = explode('::', $matches[1]);

            return self::createAttributeTokens(
                $tokens,
                $index,
                'DataProviderExternal',
                ...[
                    ...self::toClassConstant($class),
                    new Token(','),
                    new Token([T_WHITESPACE, ' ']),
                    self::createEscapedStringToken($method),
                ],
            );
        }

        return self::createAttributeTokens($tokens, $index, 'DataProvider', self::createEscapedStringToken($matches[1]));
    }

    /**
     * @return list<Token>
     */
    private static function fixDepends(Tokens $tokens, int $index, Annotation $annotation): array
    {
        $matches = self::getMatches($annotation);
        if (!isset($matches[1])) {
            return [];
        }

        $nameSuffix = '';
        $depended = $matches[1];
        if (isset($matches[2])) {
            if ('clone' === $matches[1]) {
                $nameSuffix = 'UsingDeepClone';
                $depended = $matches[2];
            } elseif ('shallowClone' === $matches[1]) {
                $nameSuffix = 'UsingShallowClone';
                $depended = $matches[2];
            }
        }

        $class = null;
        $method = $depended;
        if (str_contains($depended, '::')) {
            [$class, $method] = explode('::', $depended);
            if ('class' === $method) {
                $method = null;
                $nameSuffix = '' === $nameSuffix ? 'OnClass' : ('OnClass'.$nameSuffix);
            } else {
                $nameSuffix = ('External'.$nameSuffix);
            }
        }

        $attributeTokens = [];
        if (null !== $class) {
            $attributeTokens = self::toClassConstant($class);
        }
        if (null !== $method) {
            if ([] !== $attributeTokens) {
                $attributeTokens[] = new Token(',');
                $attributeTokens[] = new Token([T_WHITESPACE, ' ']);
            }
            $attributeTokens[] = self::createEscapedStringToken($method);
        }

        return self::createAttributeTokens($tokens, $index, 'Depends'.$nameSuffix, ...$attributeTokens);
    }

    /**
     * @return list<Token>
     */
    private static function fixRequires(Tokens $tokens, int $index, Annotation $annotation): array
    {
        $matches = self::getMatches($annotation);

        $map = [
            'extension' => 'RequiresPhpExtension',
            'function' => 'RequiresFunction',
            'PHP' => 'RequiresPhp',
            'PHPUnit' => 'RequiresPhpunit',
            'OS' => 'RequiresOperatingSystem',
            'OSFAMILY' => 'RequiresOperatingSystemFamily',
            'setting' => 'RequiresSetting',
        ];

        if (!isset($matches[2]) || !isset($map[$matches[1]])) {
            return [];
        }

        $attributeName = $map[$matches[1]];

        if ('RequiresFunction' === $attributeName && str_contains($matches[2], '::')) {
            [$class, $method] = explode('::', $matches[2]);
            $attributeName = 'RequiresMethod';
            $attributeTokens = [...self::toClassConstant($class),
                new Token(','),
                new Token([T_WHITESPACE, ' ']),
                self::createEscapedStringToken($method),
            ];
        } elseif ('RequiresPhp' === $attributeName && isset($matches[3])) {
            $attributeTokens = [self::createEscapedStringToken($matches[2].' '.$matches[3])];
        } else {
            $attributeTokens = [self::createEscapedStringToken($matches[2])];
        }

        if (isset($matches[3]) && 'RequiresPhp' !== $attributeName) {
            $attributeTokens[] = new Token(',');
            $attributeTokens[] = new Token([T_WHITESPACE, ' ']);
            $attributeTokens[] = self::createEscapedStringToken($matches[3]);
        }

        return self::createAttributeTokens($tokens, $index, $attributeName, ...$attributeTokens);
    }

    /**
     * @return list<Token>
     */
    private static function fixTestWith(Tokens $tokens, int $index, Annotation $annotation): array
    {
        $content = $annotation->getContent();
        $content = Preg::replace('/@testWith\s+/', '', $content);
        $content = Preg::replace('/(^|\R)\s+\**\s*/', "\n", $content);
        $content = trim($content);
        if ('' === $content) {
            return [];
        }

        $attributeTokens = [];
        foreach (explode("\n", $content) as $json) {
            $attributeTokens = array_merge(
                $attributeTokens,
                self::createAttributeTokens($tokens, $index, 'TestWithJson', self::createEscapedStringToken($json)),
            );
        }

        return $attributeTokens;
    }

    /**
     * @return list<Token>
     */
    private static function fixUses(Tokens $tokens, int $index, Annotation $annotation): array
    {
        $matches = self::getMatches($annotation);
        if (!isset($matches[1])) {
            return [];
        }

        if (str_starts_with($matches[1], '::')) {
            $attributeName = 'UsesFunction';
            $attributeTokens = [self::createEscapedStringToken(substr($matches[1], 2))];
        } elseif (Preg::match('/^[a-zA-Z\d\\\]+$/', $matches[1])) {
            $attributeName = 'UsesClass';
            $attributeTokens = self::toClassConstant($matches[1]);
        } else {
            return [];
        }

        return self::createAttributeTokens($tokens, $index, $attributeName, ...$attributeTokens);
    }

    /**
     * @return list<string>
     */
    private static function getMatches(Annotation $annotation): array
    {
        Preg::match(
            sprintf('/@%s\s+(\S+)(?:\s+(\S+))?(?:\s+(.+\S))?\s*(?:\R|\*+\/$)/', $annotation->getTag()->getName()),
            $annotation->getContent(),
            $matches,
        );

        \assert(array_is_list($matches)); // preg_match matches is not well typed, it depends on used regex, let's assure the type to instruct SCA

        return $matches;
    }

    private static function getAttributeNameForAnnotation(Annotation $annotation): string
    {
        $annotationName = $annotation->getTag()->getName();

        return 'backupStaticAttributes' === $annotationName
            ? 'BackupStaticProperties'
            : ucfirst($annotationName);
    }

    /**
     * @return list<Token>
     */
    private static function createAttributeTokens(
        Tokens $tokens,
        int $index,
        string $className,
        Token ...$attributeTokens
    ): array {
        if ([] !== $attributeTokens) {
            $attributeTokens = [
                new Token('('),
                ...$attributeTokens,
                new Token(')'),
            ];
        }

        return [
            clone $tokens[$index + 1],
            new Token([T_ATTRIBUTE, '#[']),
            new Token([T_NS_SEPARATOR, '\\']),
            new Token([T_STRING, 'PHPUnit']),
            new Token([T_NS_SEPARATOR, '\\']),
            new Token([T_STRING, 'Framework']),
            new Token([T_NS_SEPARATOR, '\\']),
            new Token([T_STRING, 'Attributes']),
            new Token([T_NS_SEPARATOR, '\\']),
            new Token([T_STRING, $className]),
            ...$attributeTokens,
            new Token([CT::T_ATTRIBUTE_CLOSE, ']']),
        ];
    }

    /**
     * @param class-string $name
     *
     * @return list<Token>
     */
    private static function toClassConstant(string $name): array
    {
        return [
            ...ImportProcessor::tokenizeName($name),
            new Token([T_DOUBLE_COLON, '::']),
            new Token([CT::T_CLASS_CONSTANT, 'class']),
        ];
    }

    private static function createEscapedStringToken(string $value): Token
    {
        return new Token([T_CONSTANT_ENCAPSED_STRING, "'".str_replace("'", "\\'", $value)."'"]);
    }
}