<?php

namespace App\Service;

use App\Model\Settings;
use Illuminate\Support\Facades\Cache;

class LoginService extends Service
{
    const ALL = 'all';

    public function loginRule($data){
        // 获取用户的IP地址
        $userIP = $_SERVER['REMOTE_ADDR'];
        // 获取设置的IP地址
        $allowedIPs = $this->allowedIPs();

        // 校验用户IP是否在允许的范围内
        $isValidIP = false;
        if(in_array(self::ALL,$allowedIPs)) {
            $isValidIP = true;
        }else{
            foreach ($allowedIPs as $allowedIP) {
                if (strpos($allowedIP, '/') !== false) {
                    // IP段表示法校验
                    list($subnet, $mask) = explode('/', $allowedIP);
                    if ((ip2long($userIP) & ~((1 << (32 - $mask)) - 1)) == ip2long($subnet)) {
                        $isValidIP = true;
                        break;
                    }
                } else {
                    // 单个IP地址校验
                    if ($allowedIP === $userIP) {
                        $isValidIP = true;
                        break;
                    }
                }
            }
        }

        return $isValidIP;
   }

    public function allowedIPs(){
        $allowedIPs = Settings::where('name','allowedIPs')->first();
        if(empty($allowedIPs) || empty($allowedIPs->value)) return [self::ALL];

        return explode(',',$allowedIPs->value);
    }

    //设置登录错误次数(超过三次)
    public static function errorSetLogin($cacheKey){
        if(Cache::has($cacheKey)){
            $num = Cache::get($cacheKey);

            $num++;
            Cache::put($cacheKey,$num,30);
            if($num >= 3){
                return ['账号密码输入错误3次，30分钟内限制登录！'];
            }else{
                return ['账号密码输入错误第'. $num .'次！'];
            }
        }else{
            Cache::add($cacheKey,1,30);
            return ['密码输入错误！'];
        }
    }

    //判断是否限制登录
    public static function isLoginlimitation($cacheKey){
        if(Cache::has($cacheKey)){
            $num = Cache::get($cacheKey);
            if($num >= 3) return true;
        }
        return false;
    }
}