<?php

declare(strict_types=1);

namespace Symplify\CodingStandard\TokenRunner\Transformer\FixerTransformer;

use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;
use Symplify\CodingStandard\TokenRunner\Analyzer\FixerAnalyzer\TokenSkipper;
use Symplify\CodingStandard\TokenRunner\ValueObject\BlockInfo;

final class TokensInliner
{
    /**
     * @var TokenSkipper
     */
    private $tokenSkipper;

    public function __construct(TokenSkipper $tokenSkipper)
    {
        $this->tokenSkipper = $tokenSkipper;
    }

    /**
     * @param Tokens|Token[] $tokens
     */
    public function inlineItems(Tokens $tokens, BlockInfo $blockInfo): void
    {
        // replace line feeds with " "
        for ($i = $blockInfo->getStart() + 1; $i < $blockInfo->getEnd(); ++$i) {
            /** @var Token $currentToken */
            $currentToken = $tokens[$i];
            $i = $this->tokenSkipper->skipBlocks($tokens, $i);
            if (! $currentToken->isGivenKind(T_WHITESPACE)) {
                continue;
            }

            /** @var Token $previousToken */
            $previousToken = $tokens[$i - 1];

            /** @var Token $nextToken */
            $nextToken = $tokens[$i + 1];

            // do not clear before *doc end, removing spaces breaks stuff
            if ($previousToken->isGivenKind([T_START_HEREDOC, T_END_HEREDOC])) {
                continue;
            }

            // clear space after opening and before closing bracket
            if ($this->isBlockStartOrEnd($previousToken, $nextToken)) {
                $tokens->clearAt($i);
                continue;
            }

            $tokens[$i] = new Token([T_WHITESPACE, ' ']);
        }
    }

    private function isBlockStartOrEnd(Token $previousToken, Token $nextToken): bool
    {
        if (in_array($previousToken->getContent(), ['(', '['], true)) {
            return true;
        }

        return in_array($nextToken->getContent(), [')', ']'], true);
    }
}