<?php

namespace App\Components;

use Cache;
use Http;
use Log;

class NetworkDetection
{
    /**
     * 用api.50network.com进行节点阻断检测.
     *
     * @param  string  $ip  被检测的IP
     * @param  bool  $type  TRUE 为ICMP,FALSE 为tcp
     * @param  int|null  $port  检测端口，默认为空
     *
     * @return bool|string
     */
    public static function networkCheck(string $ip, bool $type, $port = null)
    {
        $cacheKey = 'network_times_'.md5($ip);
        if (Cache::has($cacheKey)) {
            Cache::decrement($cacheKey);
        } else {
            Cache::put($cacheKey, 2, Day); // 24小时
        }
        $url = 'https://api.50network.com/china-firewall/check/ip/'.($type ? 'icmp/' : ($port ? 'tcp_port/' : 'tcp_ack/')).$ip.($port ? '/'.$port : '');

        $checkName = $type ? 'ICMP' : 'TCP';
        $response = Http::timeout(15)->get($url);

        if ($response->ok()) {
            $message = $response->json();
            if (! $message) {
                Log::warning('【'.$checkName.'阻断检测】检测'.$ip.'时，接口返回异常访问链接：'.$url);

                return false;
            }

            if (! $message['success']) {
                if ($message['error'] === 'execute timeout (3s)') {
                    sleep(10);
                    if (Cache::get($cacheKey) < 0) {
                        Log::warning('【'.$checkName.'阻断检测】检测'.$ip.$port.'时，重复请求后无结果，最后返回'.$message['error']);

                        return false;
                    }

                    return self::networkCheck($ip, $type, $port);
                }

                Log::warning('【'.$checkName.'阻断检测】检测'.$ip.$port.'时，返回'.var_export($message, true));

                return false;
            }

            if ($message['firewall-enable'] && $message['firewall-disable']) {
                return '通讯正常'; // 正常
            }

            if ($message['firewall-enable'] && ! $message['firewall-disable']) {
                return '海外阻断'; // 国外访问异常
            }

            if (! $message['firewall-enable'] && $message['firewall-disable']) {
                return '国内阻断'; // 被墙
            }

            return '机器宕机'; // 服务器宕机
        }

        return false;
    }

    /**
     * 用外部API进行Ping检测.
     *
     * @param  string  $ip  被检测的IP或者域名
     *
     * @return bool|array
     */
    public static function ping(string $ip)
    {
        $url = 'https://api.oioweb.cn/api/hostping.php?host='.$ip; // https://api.iiwl.cc/api/ping.php?host=
        $response = Http::timeout(15)->retry(2)->get($url);

        // 发送成功
        if ($response->ok()) {
            $message = $response->json();
            if ($message && $message['code']) {
                return $message['data'];
            }
            // 发送失败
            Log::warning('【PING】检测'.$ip.'时，返回'.var_export($message, true));

            return false;
        }
        Log::warning('【PING】检测'.$ip.'时，接口返回异常访问链接：'.$url);

        // 发送错误
        return false;
    }
}