<?php

/*
 * 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\ArrayNotation;

use PhpCsFixer\AbstractFixer;
use PhpCsFixer\FixerDefinition\CodeSample;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\Tokenizer\CT;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;
use PhpCsFixer\Tokenizer\TokensAnalyzer;

/**
 * @author Sebastiaan Stok <s.stok@rollerscapes.net>
 * @author Dariusz Rumiński <dariusz.ruminski@gmail.com>
 */
final class TrailingCommaInMultilineArrayFixer extends AbstractFixer
{
    /**
     * {@inheritdoc}
     */
    public function getDefinition()
    {
        return new FixerDefinition(
            'PHP multi-line arrays should have a trailing comma.',
            [new CodeSample("<?php\narray(\n    1,\n    2\n);\n")]
        );
    }

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

    /**
     * {@inheritdoc}
     */
    protected function applyFix(\SplFileInfo $file, Tokens $tokens)
    {
        $tokensAnalyzer = new TokensAnalyzer($tokens);

        for ($index = $tokens->count() - 1; $index >= 0; --$index) {
            if ($tokensAnalyzer->isArray($index) && $tokensAnalyzer->isArrayMultiLine($index)) {
                $this->fixArray($tokens, $index);
            }
        }
    }

    /**
     * @param Tokens $tokens
     * @param int    $index
     */
    private function fixArray(Tokens $tokens, $index)
    {
        $startIndex = $index;

        if ($tokens[$startIndex]->isGivenKind(T_ARRAY)) {
            $startIndex = $tokens->getNextTokenOfKind($startIndex, ['(']);
            $endIndex = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_PARENTHESIS_BRACE, $startIndex);
        } else {
            $endIndex = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_ARRAY_SQUARE_BRACE, $startIndex);
        }

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

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

            $endToken = $tokens[$endIndex];

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