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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\Strict;

use PhpCsFixer\AbstractFixer;
use PhpCsFixer\FixerDefinition\CodeSample;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
use PhpCsFixer\Tokenizer\Analyzer\FunctionsAnalyzer;
use PhpCsFixer\Tokenizer\CT;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;

/**
 * @author Dariusz Rumiński <[email protected]>
 */
final class StrictParamFixer extends AbstractFixer
{
    public function getDefinition(): FixerDefinitionInterface
    {
        return new FixerDefinition(
            'Functions should be used with `$strict` param set to `true`.',
            [new CodeSample("<?php\n\$a = array_keys(\$b);\n\$a = array_search(\$b, \$c);\n\$a = base64_decode(\$b);\n\$a = in_array(\$b, \$c);\n\$a = mb_detect_encoding(\$b, \$c);\n")],
            'The functions "array_keys", "array_search", "base64_decode", "in_array" and "mb_detect_encoding" should be used with $strict param.',
            'Risky when the fixed function is overridden or if the code relies on non-strict usage.'
        );
    }

    public function isCandidate(Tokens $tokens): bool
    {
        return $tokens->isTokenKindFound(T_STRING);
    }

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

    /**
     * {@inheritdoc}
     *
     * Must run before MethodArgumentSpaceFixer, NativeFunctionInvocationFixer.
     */
    public function getPriority(): int
    {
        return 31;
    }

    protected function applyFix(\SplFileInfo $file, Tokens $tokens): void
    {
        $functionsAnalyzer = new FunctionsAnalyzer();

        static $map = null;

        if (null === $map) {
            $trueToken = new Token([T_STRING, 'true']);

            $map = [
                'array_keys' => [null, null, $trueToken],
                'array_search' => [null, null, $trueToken],
                'base64_decode' => [null, $trueToken],
                'in_array' => [null, null, $trueToken],
                'mb_detect_encoding' => [null, [new Token([T_STRING, 'mb_detect_order']), new Token('('), new Token(')')], $trueToken],
            ];
        }

        for ($index = $tokens->count() - 1; 0 <= $index; --$index) {
            $token = $tokens[$index];

            $nextIndex = $tokens->getNextMeaningfulToken($index);
            if (null !== $nextIndex && !$tokens[$nextIndex]->equals('(')) {
                continue;
            }

            $lowercaseContent = strtolower($token->getContent());
            if (isset($map[$lowercaseContent]) && $functionsAnalyzer->isGlobalFunctionCall($tokens, $index)) {
                $this->fixFunction($tokens, $index, $map[$lowercaseContent]);
            }
        }
    }

    /**
     * @param list<?Token> $functionParams
     */
    private function fixFunction(Tokens $tokens, int $functionIndex, array $functionParams): void
    {
        $startBraceIndex = $tokens->getNextTokenOfKind($functionIndex, ['(']);
        $endBraceIndex = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_PARENTHESIS_BRACE, $startBraceIndex);
        $paramsQuantity = 0;
        $expectParam = true;

        for ($index = $startBraceIndex + 1; $index < $endBraceIndex; ++$index) {
            $token = $tokens[$index];

            if ($expectParam && !$token->isWhitespace() && !$token->isComment()) {
                ++$paramsQuantity;
                $expectParam = false;
            }

            if ($token->equals('(')) {
                $index = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_PARENTHESIS_BRACE, $index);

                continue;
            }

            if ($token->isGivenKind(CT::T_ARRAY_SQUARE_BRACE_OPEN)) {
                $index = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_ARRAY_SQUARE_BRACE, $index);

                continue;
            }

            if ($token->equals(',')) {
                $expectParam = true;

                continue;
            }
        }

        $functionParamsQuantity = \count($functionParams);

        if ($paramsQuantity === $functionParamsQuantity) {
            return;
        }

        $tokensToInsert = [];

        for ($i = $paramsQuantity; $i < $functionParamsQuantity; ++$i) {
            // function call do not have all params that are required to set useStrict flag, exit from method!
            if (null === $functionParams[$i]) {
                return;
            }

            $tokensToInsert[] = new Token(',');
            $tokensToInsert[] = new Token([T_WHITESPACE, ' ']);

            if (!\is_array($functionParams[$i])) {
                $tokensToInsert[] = clone $functionParams[$i];

                continue;
            }

            foreach ($functionParams[$i] as $param) {
                $tokensToInsert[] = clone $param;
            }
        }

        $beforeEndBraceIndex = $tokens->getPrevMeaningfulToken($endBraceIndex);

        if ($tokens[$beforeEndBraceIndex]->equals(',')) {
            array_shift($tokensToInsert);
            $tokensToInsert[] = new Token(',');
        }

        $tokens->insertAt($beforeEndBraceIndex + 1, $tokensToInsert);
    }
}