<?php

declare(strict_types=1);

namespace app\miniapi\protection;

use Webman\Http\Request;
use app\miniapi\http\ClientIp;
use app\miniapi\http\Pagination;

/** Only registered routes create endpoint buckets; IDs and query filters share quotas. */
final class RequestProfile
{
    private const PAGED = [
        '/api/mini/v1/packages',
        '/api/mini/v1/enterprises/{id}/ledger',
        '/api/mini/v1/enterprises/{id}/orders',
        '/api/mini/v1/enterprises/{id}/devices',
        '/api/mini/v1/drivers/{id}/tasks',
        '/api/mini/v1/agents/{id}/customers',
        '/api/mini/v1/agents/{id}/orders',
    ];

    public static function endpoint(Request $request): string
    {
        $route = $request->route?->getPath();
        if (!$route || str_contains($route, '{path:')) {
            return 'unknown';
        }
        $method = $request->method() === 'HEAD' ? 'GET' : $request->method();

        // Route matching has already constrained non-ID segments to registered literals.
        return $method . ' ' . preg_replace('#/\d+(?=/|$)#', '/{id}', $request->path());
    }

    public static function listCost(Request $request): int
    {
        if ($request->method() !== 'GET') {
            return 0;
        }
        $path = preg_replace('#/\d+(?=/|$)#', '/{id}', $request->path());
        if (!in_array($path, self::PAGED, true)) {
            return 0;
        }

        return (new Pagination($request->get()))->pageSize;
    }

    public static function ip(Request $request): string
    {
        // Resolved through the proxy allowlist so a deployment behind Nginx keeps per-caller
        // buckets; an untrusted peer's own header is still ignored.
        $ip = ClientIp::resolve($request);
        $packed = @inet_pton($ip);
        if ($packed === false) {
            return 'unknown';
        }
        if (strlen($packed) === 16 && substr($packed, 0, 12) === str_repeat("\0", 10) . "\xff\xff") {
            $packed = substr($packed, 12);
        }

        return (string) inet_ntop($packed);
    }
}