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<?php

declare(strict_types=1);

namespace League\HTMLToMarkdown\Converter;

use League\HTMLToMarkdown\ElementInterface;

class PreformattedConverter implements ConverterInterface
{
    public function convert(ElementInterface $element): string
    {
        $preContent = \html_entity_decode($element->getChildrenAsString());
        $preContent = \preg_replace('/<pre\b[^>]*>/', '', $preContent);
        \assert($preContent !== null);
        $preContent = \str_replace('</pre>', '', $preContent);

/*
         * Checking for the code tag.
         * Usually pre tags are used along with code tags. This conditional will check for already converted code tags,
         * which use backticks, and if those backticks are at the beginning and at the end of the string it means
         * there's no more information to convert.
         */

$firstBacktick = \strpos(\trim($preContent), '`');
        $lastBacktick  = \strrpos(\trim($preContent), '`');
        if ($firstBacktick === 0 && $lastBacktick === \strlen(\trim($preContent)) - 1) {
            return $preContent . "\n\n";
        }

// If the execution reaches this point it means it's just a pre tag, with no code tag nested

// Empty lines are a special case
        if ($preContent === '') {
            return "```\n```\n\n";
        }

// Normalizing new lines
        $preContent = \preg_replace('/\r\n|\r|\n/', "\n", $preContent);
        \assert(\is_string($preContent));

// Ensure there's a newline at the end
        if (\strrpos($preContent, "\n") !== \strlen($preContent) - \strlen("\n")) {
            $preContent .= "\n";
        }

// Use three backticks
        return "```\n" . $preContent . "```\n\n";
    }

/**
     * @return string[]
     */
    public function getSupportedTags(): array
    {
        return ['pre'];
    }
}