<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cache;
use Symfony\Component\HttpFoundation\Response;

class CheckRateLimit
{
    /**
     * Handle an incoming request.
     * Check rate limit for gateway user.
     *
     * @param  \Closure(\Illuminate\Http\Request): (\Symfony\Component\HttpFoundation\Response)  $next
     */
    public function handle(Request $request, Closure $next): Response
    {
        $user = $request->user(); // GatewayUser from API Guard

        if (!$user || !$user->rate_limit_per_hour) {
            return $next($request);
        }

        $key = 'rate_limit:' . $user->user_id;
        $requests = Cache::get($key, 0);

        if ($requests >= $user->rate_limit_per_hour) {
            $ttl = Cache::get($key . ':ttl', 3600);
            
            return response()->json([
                'error' => [
                    'message' => 'Rate limit exceeded. Please try again later.',
                    'type' => 'rate_limit_exceeded',
                    'code' => 429,
                    'limit' => $user->rate_limit_per_hour,
                    'current' => $requests,
                    'retry_after' => $ttl,
                ]
            ], 429);
        }

        // Increment counter
        Cache::put($key, $requests + 1, 3600);
        if ($requests == 0) {
            Cache::put($key . ':ttl', 3600, 3600);
        }

        return $next($request);
    }
}