<?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\PhpTag;

use PhpCsFixer\AbstractFixer;
use PhpCsFixer\Fixer\WhitespacesAwareFixerInterface;
use PhpCsFixer\FixerDefinition\CodeSample;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;

/**
 * @author Ceeram <ceeram@cakephp.org>
 */
final class BlankLineAfterOpeningTagFixer extends AbstractFixer implements WhitespacesAwareFixerInterface
{
    /**
     * {@inheritdoc}
     */
    public function getDefinition(): FixerDefinitionInterface
    {
        return new FixerDefinition(
            'Ensure there is no code on the same line as the PHP open tag and it is followed by a blank line.',
            [new CodeSample("<?php \$a = 1;\n\$b = 1;\n")]
        );
    }

    /**
     * {@inheritdoc}
     *
     * Must run before NoBlankLinesBeforeNamespaceFixer.
     * Must run after DeclareStrictTypesFixer.
     */
    public function getPriority(): int
    {
        return 1;
    }

    /**
     * {@inheritdoc}
     */
    public function isCandidate(Tokens $tokens): bool
    {
        return $tokens->isTokenKindFound(T_OPEN_TAG);
    }

    /**
     * {@inheritdoc}
     */
    protected function applyFix(\SplFileInfo $file, Tokens $tokens): void
    {
        $lineEnding = $this->whitespacesConfig->getLineEnding();

        // ignore files with short open tag and ignore non-monolithic files
        if (!$tokens[0]->isGivenKind(T_OPEN_TAG) || !$tokens->isMonolithicPhp()) {
            return;
        }

        $newlineFound = false;

        /** @var Token $token */
        foreach ($tokens as $token) {
            if ($token->isWhitespace() && str_contains($token->getContent(), "\n")) {
                $newlineFound = true;

                break;
            }
        }

        // ignore one-line files
        if (!$newlineFound) {
            return;
        }

        $token = $tokens[0];

        if (!str_contains($token->getContent(), "\n")) {
            $tokens[0] = new Token([$token->getId(), rtrim($token->getContent()).$lineEnding]);
        }

        if (!str_contains($tokens[1]->getContent(), "\n")) {
            if ($tokens[1]->isWhitespace()) {
                $tokens[1] = new Token([T_WHITESPACE, $lineEnding.$tokens[1]->getContent()]);
            } else {
                $tokens->insertAt(1, new Token([T_WHITESPACE, $lineEnding]));
            }
        }
    }
}
