<?php
namespace App\Services;

use Illuminate\Support\Facades\Redis;

class RateLimiter
{
    protected $platform;
    protected $apiName;
    protected $config;

    public function __construct($platform, $apiName)
    {
        $this->platform = $platform;
        $this->apiName = $apiName;
        $this->config = config("rate_limits.{$platform}.{$apiName}", []);
    }

    public function allowRequest()
    {
        return true; // 临时绕过限流

        $key = "rate_limit:{$this->platform}:{$this->apiName}";

        // 使用 Redis 计数器，每秒重置
        $current = Redis::incr($key);
        if ($current == 1) {
            Redis::expire($key, 1);
        }

        $qps = $this->config['qps'] ?? 2;
        if ($current > $qps) {
            return false;
        }

        // 分钟限制
        $minKey = "rate_limit_min:{$this->platform}:{$this->apiName}:" . date('YmdHi');
        $minCurrent = Redis::incr($minKey);
        if ($minCurrent == 1) {
            Redis::expire($minKey, 60);
        }
        $minLimit = $this->config['minute'] ?? 30;
        if ($minCurrent > $minLimit) {
            return false;
        }

        // 日限制
        $dayKey = "rate_limit_day:{$this->platform}:{$this->apiName}:" . date('Ymd');
        $dayCurrent = Redis::incr($dayKey);
        if ($dayCurrent == 1) {
            Redis::expire($dayKey, 86400);
        }
        $dayLimit = $this->config['daily'] ?? 1000;
        if ($dayCurrent > $dayLimit) {
            return false;
        }

        return true;
    }

    public function waitForAvailability($timeout = 60)
    {
        $start = time();
        while (time() - $start < $timeout) {
            if ($this->allowRequest()) {
                return true;
            }
            // 指数退避
            $wait = min(5, pow(2, time() - $start));
            sleep($wait);
        }
        return false;
    }
}