<?php


namespace App\Servers;


/**
 * Redis数据缓存类
 */
class PassServer
{

    /**
     * 错误信息
     * @var string
     */
    private $errorMsg = '';

    private $password = '';


    private function __construct($password = '', $encrypt = '')
    {
        $this->setPassword($password);
        $this->setEncrypt($encrypt);
    }

    /**
     * 创建对象
     * @param string $password
     * @param string $encrypt
     * @return PassServer
     */
    static function creatServer($password = '', $encrypt = '')
    {
        return new PassServer($password, $encrypt);
    }

    /**
     * @return string
     */
    public function getPassword(): string
    {
        return $this->password;
    }

    /**
     * @param string $password
     */
    public function setPassword($password = ''): void
    {
        if (!empty($password)) $this->password = $password;
    }

    /**
     * @return string
     */
    public function getEncrypt(): string
    {
        return $this->encrypt;
    }

    /**
     * @param string $encrypt
     */
    public function setEncrypt($encrypt = ''): void
    {
        if (!empty($encrypt)) $this->encrypt = $encrypt;
    }

    private $encrypt = '';


    /**
     * @return string
     */
    public function getErrorMsg(): string
    {
        return $this->errorMsg;
    }

    /**
     * 加密字符串
     * @param $length
     * @return null|string
     */
    public function getRandChar($length = 6)
    {
        $str = null;
        $strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
        $max = strlen($strPol) - 1;
        for ($i = 0; $i < $length; $i++) {
            $str .= $strPol[rand(0, $max)];//rand($min,$max)生成介于min和max两个数之间的一个随机整数
        }
        return $str;
    }

    /**
     * 创建会员密码
     * @return array|false
     */
    function creatPassword()
    {
        if (empty($this->password)) {
            $this->errorMsg = "密码不能为空";
            return false;
        }
        if (empty($this->encrypt)) $this->encrypt = $this->getRandChar();
        $password = $this->memberPassword();
        return ['password' => $password, 'encrypt' => $this->encrypt];
    }

    /**
     * 验证密码
     * @param $member_pass
     * @return bool
     */
    public function verifyPass($member_pass)
    {
        $str = $this->memberPassword();
        return $member_pass == $str;
    }

    /**
     * 密码加密
     * @return string
     */
    private function memberPassword()
    {
        $str = md5($this->password) . md5($this->encrypt);
        return md5($str);
    }

    /**
     * 获取推荐码
     * @return int|string
     */
    public function getInviteCode()
    {
        return InviteCodeServer::creatServer()->getInviteCode();
    }


    /**
     * 生成会员登录token
     * @param $m_id
     * @return string
     */
    public function getMemberToken($m_id)
    {
        $token = md5($m_id . 'token' . time());
        return $token;
    }


    public  function setSecretKey($private_key, $key_num = 0)
    {
        $key_num = $key_num % 20;
        if ($key_num == 0) $key_num = 15;
        $private_one = substr($private_key, 0, $key_num);
        $private_two = substr($private_key, $key_num, 5);
        $private_three = substr($private_key, $key_num + 5);
        $new_private = $private_three . $private_one . $private_two;
        return $new_private;
    }

    /**
     * @param $private_key
     * @param int $key_num
     * @return string
     */
    public  function getSecretKey($private_key, $key_num = 0)
    {
        $key_num = $key_num % 20;
        if ($key_num == 0) $key_num = 15;
        $private_length = strlen($private_key);
        $three_length = $private_length - $key_num - 5;
        $private_three = substr($private_key, 0, $three_length);
        $private_two = substr($private_key, -5);
        $private_one = substr($private_key, $three_length, $key_num);
        $new_private = $private_one . $private_two . $private_three;
        return $new_private;
    }


}