<?php
declare (strict_types=1);
namespace app\api\service;

use app\api\model\User;
/**
 * 用户表
 */
class UserService {
    public function mktoken(){
        // jwt  
        $guid = get_guid_v4();
        $dtime = time();
        return md5(uniqid($guid.$dtime,true));
    }
    /**
     * 用户登录操作,传入用户查询后才对比密码
     */
    public function login(string $uname,string $pass){
        // query db
        $drs = User::where(['nick_name'=>$uname,'delete_time'=>0])->find();
        // 异常处理
        if(!isset($drs)){
            throwError('用户不存在');
            return -1;
        }else{
            $fpass = password($pass.$drs['salt']);
            // 对比密码
            if($drs['password'] != $fpass){
                throwError('密码错误');
                return false;
            }
            // 返回用户信息
            return $drs;
        }
        return false;
    }

    /**
     * @param array $arr
     * @return bool
     */
    public function register(array $arr){
        $salt = makeSalt(6);
        // 密码加密
        $arr['password'] = password($arr['password'].$salt);
        // 生成salt
        $arr['salt'] = $salt;
        $dtime =time();
        $arr['create_time'] = $dtime;
        $arr['update_time'] = $dtime;
        // 保存
        $model = new User;
        $uid = $model->save($arr);
        return isset($uid)?true:false;
    }

    /**
     * 获取登录的token
     * @param int $userId
     * @return string
     */
    public function getToken(int $userId): string
    {
        static $token = '';
        if (empty($token)) {
            $token = $this->makeToken($userId);
        }
        return $token;
    }
    /**
     * 生成用户认证的token
     * @param int $userId
     * @return string
     */
    private function makeToken(int $userId): string
    {
        // 生成一个不会重复的随机字符串
        $guid = \get_guid_v4();
        // 当前时间戳 (精确到毫秒)
        $timeStamp = \microtime(true);
        // 自定义一个盐
        $salt = makeSalt(12);
        return md5("{$timeStamp}_{$userId}_{$guid}_{$salt}");
    }
}