<?php
declare(strict_types=1);

namespace Core\Services;

class Shortcodes
{
    /** @var array<string, callable> */
    private static array $handlers = [];

    public static function register(string $name, callable $handler): void
    {
        $key = strtolower(trim($name));
        if ($key === '') {
            return;
        }
        self::$handlers[$key] = $handler;
    }

    public static function render(string $content, array $context = []): string
    {
        if ($content === '' || !self::$handlers) {
            return $content;
        }

        return preg_replace_callback('/\[([a-zA-Z0-9_-]+)([^\]]*)\]/', function (array $m) use ($context): string {
            $tag = strtolower((string)($m[1] ?? ''));
            if (!isset(self::$handlers[$tag])) {
                return (string)$m[0];
            }
            $attrs = self::parseAttrs((string)($m[2] ?? ''));
            try {
                $out = (self::$handlers[$tag])($attrs, $context);
                return is_string($out) ? $out : '';
            } catch (\Throwable $e) {
                return '';
            }
        }, $content) ?? $content;
    }

    private static function parseAttrs(string $raw): array
    {
        $attrs = [];
        if ($raw === '') {
            return $attrs;
        }
        if (preg_match_all('/([a-zA-Z0-9_-]+)\s*=\s*"([^"]*)"/', $raw, $matches, PREG_SET_ORDER)) {
            foreach ($matches as $match) {
                $attrs[strtolower((string)$match[1])] = (string)$match[2];
            }
        }
        return $attrs;
    }
}