Inventory/src/Mcp/Tool/McpToolHelper.php

<?php

declare(strict_types=1);

namespace App\Mcp\Tool;

use Mcp\Schema\Content\TextContent;
use Mcp\Schema\Result\CallToolResult;
use RuntimeException;
use Symfony\Bundle\SecurityBundle\Security;

trait McpToolHelper
{
    private function requireRole(Security $security, string $role): void
    {
        if (!$security->isGranted($role)) {
            throw new RuntimeException("Permission denied: {$role} required.");
        }
    }

    private function jsonResponse(array $data): CallToolResult
    {
        return new CallToolResult(
            content: [new TextContent(text: json_encode($data, JSON_THROW_ON_ERROR | JSON_UNESCAPED_UNICODE))],
        );
    }

    private function mcpError(string $category, string $message): never
    {
        throw new RuntimeException("{$category}: {$message}");
    }

    /**
     * @return array{page: int, limit: int, offset: int}
     */
    private function paginationParams(int $page = 1, int $limit = 30): array
    {
        $page   = max(1, $page);
        $limit  = min(100, max(1, $limit));
        $offset = ($page - 1) * $limit;

        return ['page' => $page, 'limit' => $limit, 'offset' => $offset];
    }

    private function paginatedResponse(array $items, int $total, int $page, int $limit): CallToolResult
    {
        return $this->jsonResponse([
            'items'     => $items,
            'total'     => $total,
            'page'      => $page,
            'limit'     => $limit,
            'pageCount' => (int) ceil($total / max(1, $limit)),
        ]);
    }
}