<?php

namespace League\CommonMark\Extension\Attributes\Util;

use League\CommonMark\Node\Node;
use League\CommonMark\Parser\Cursor;
use League\CommonMark\Util\RegexHelper;

/**
 * @internal
 */
final class AttributesHelper
{
    private const SINGLE_ATTRIBUTE = '\s*([.#][_a-z0-9-]+|' . RegexHelper::PARTIAL_ATTRIBUTENAME . RegexHelper::PARTIAL_ATTRIBUTEVALUESPEC . ')\s*';
    private const ATTRIBUTE_LIST = '/^{:?(' . self::SINGLE_ATTRIBUTE . ')+}/i';

    /**
     * @return array<string, mixed>
     */
    public static function parseAttributes(Cursor $cursor): array
    {
        $state = $cursor->saveState();
        $cursor->advanceToNextNonSpaceOrNewline();

        // Quick check to see if we might have attributes
        if ($cursor->getCharacter() !== '{') {
            $cursor->restoreState($state);

            return [];
        }

        // Attempt to match the entire attribute list expression
        // While this is less performant than checking for '{' now and '}' later, it simplifies
        // matching individual attributes since they won't need to look ahead for the closing '}'
        // while dealing with the fact that attributes can technically contain curly braces.
        // So we'll just match the start and end braces up front.
        $attributeExpression = $cursor->match(self::ATTRIBUTE_LIST);
        if ($attributeExpression === null) {
            $cursor->restoreState($state);

            return [];
        }

        // Trim the leading '{' or '{:' and the trailing '}'
        $attributeExpression = \ltrim(\substr($attributeExpression, 1, -1), ':');
        $attributeCursor     = new Cursor($attributeExpression);

        /** @var array<string, mixed> $attributes */
        $attributes = [];
        while ($attribute = \trim((string) $attributeCursor->match('/^' . self::SINGLE_ATTRIBUTE . '/i'))) {
            if ($attribute[0] === '#') {
                $attributes['id'] = \substr($attribute, 1);

                continue;
            }

            if ($attribute[0] === '.') {
                $attributes['class'][] = \substr($attribute, 1);

                continue;
            }

            /** @psalm-suppress PossiblyUndefinedArrayOffset */
            [$name, $value] = \explode('=', $attribute, 2);

            $first = $value[0];
            $last  = \substr($value, -1);
            if (($first === '"' && $last === '"') || ($first === "'" && $last === "'") && \strlen($value) > 1) {
                $value = \substr($value, 1, -1);
            }

            if (\strtolower(\trim($name)) === 'class') {
                foreach (\array_filter(\explode(' ', \trim($value))) as $class) {
                    $attributes['class'][] = $class;
                }
            } else {
                $attributes[\trim($name)] = \trim($value);
            }
        }

        if (isset($attributes['class'])) {
            $attributes['class'] = \implode(' ', (array) $attributes['class']);
        }

        return $attributes;
    }

    /**
     * @param Node|array<string, mixed> $attributes1
     * @param Node|array<string, mixed> $attributes2
     *
     * @return array<string, mixed>
     */
    public static function mergeAttributes($attributes1, $attributes2): array
    {
        $attributes = [];
        foreach ([$attributes1, $attributes2] as $arg) {
            if ($arg instanceof Node) {
                $arg = $arg->data->get('attributes');
            }

            /** @var array<string, mixed> $arg */
            $arg = (array) $arg;
            if (isset($arg['class'])) {
                if (\is_string($arg['class'])) {
                    $arg['class'] = \array_filter(\explode(' ', \trim($arg['class'])));
                }

                foreach ($arg['class'] as $class) {
                    $attributes['class'][] = $class;
                }

                unset($arg['class']);
            }

            $attributes = \array_merge($attributes, $arg);
        }

        if (isset($attributes['class'])) {
            $attributes['class'] = \implode(' ', $attributes['class']);
        }

        return $attributes;
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NTE0MjQzOTM4NDUxNTI3MCA1MjYxMjE1MDQwNTExNjU5IDM3OTIyMDgyMTY2NTc4ODY=