<?php

/**
 * @author Any
 * @description KISS
 * @date 2020-11-3
 * @version 1.0.0
 * 
 * _____LOG_____
 * 
 */
namespace app\models\sms;

use app\components\FlashStorage;
use app\components\sms\AliSmsMsgSender;
use app\components\sms\TnxSmsMsgSender;
use app\components\EncryptHelper;


class SmsMsgHelper
{
    public $cx_mch_id;
    
    private $sms_setting;
    private $is_prod;


    public function __construct($cx_mch_id) {
        $this->cx_mch_id = $cx_mch_id;
        $this->sms_setting = SmsSetting::findOne(['cx_mch_id' => $cx_mch_id]);
        if($this->sms_setting == null){
            throw new \Exception("短信未配置");
        }
        $this->is_prod = $this->sms_setting->is_prod == 1 ? true : false;
    }
    
    private function check_limit($mobile, $tpl_code, $mobile_prefix, $user_id)
    {
        //手机号加密
        $mobile = EncryptHelper::encryptMobilePhone($mobile);
        
        $limit = $this->sms_setting->day_limit;
        
        $count = SmsRecord::find()->where([
            'mobile_phone' => $mobile,
            'mobile_prefix' => $mobile_prefix,
            'tpl_code' => $tpl_code,
            'user_id' => $user_id,
        ])->andWhere([
            '>',
            'created_at',
            time() - 86400
        ])->count();
        if($count >= $limit && $limit != 0){
            return [
                'code' => 1,
                'msg' => '今日申请验证码次数超额'
            ];
        }          
        return [
            'code' => 0,
            'msg' => 'ok'
        ];
    }
    
    /**
     * 发送验证码
     * @param string $mobile 手机号
     * @param string $tpl_type 短信类型
     * @param string $mobile_prefix 手机号国家代码
     * @param integer $user_id 用户ID
     */
    public function sender($mobile, $tpl_type, $mobile_prefix = "86", $user_id = 0)
    {
        $tpl_code = SmsTpl::getTpl($tpl_type, $this->sms_setting->type, $this->cx_mch_id);
        if($tpl_code == null){
            return [
                'code' => 1,
                'msg' => '未设置短信模板'
            ];
        }
        //每日限额检查
        $res = $this->check_limit($mobile, $tpl_code, $mobile_prefix, $user_id);
        if($res['code'] != 0){
            return $res;
        }
        //速率检查
        $cache_key = $this->get_cache_key($tpl_type, $mobile, $mobile_prefix, $user_id);
        $cache_val = FlashStorage::getCache($cache_key);
        $time_delay = $this->sms_setting->time_delay;
        if($cache_val !== false && time() < $cache_val['timestamp'] + $time_delay){
            return [
                'code' => 1,
                'msg' => '请求过快，稍后再试'
            ];            
        }
        $code = $this->get_code();
        if($this->is_prod){
            //正式环境
            try{
                $res = $this->_sender($mobile, $code, $tpl_code, $mobile_prefix);
            } catch (\Exception $ex){
                $res = [
                    'code' => 1,
                    'msg' => $ex->getMessage()
                ];
            }
        } else {
            $res['data'] = $code;
        }
        if($res['code'] == 0){
            //记录短信发送记录
            $resp = SmsRecord::logger($mobile, $tpl_code, $code, $user_id, $this->cx_mch_id, $mobile_prefix);
            if($resp['code'] != 0){
                //@TODO 记录错误
            }
            //cache      
            $cache_val = [];
            $cache_val['timestamp'] = time();
            $cache_val['code'] = $code;
            $cache_val['mobile'] = $mobile;            
            $cache_val['mobile_prefix'] = $mobile_prefix;            
            $max_age = $this->sms_setting->expire_time;
            FlashStorage::setCache($cache_key, $cache_val,$max_age);
        }
        return $res;
    }
    
    private function get_code()
    {
        $code_len = $this->sms_setting->code_len;
        $code = "";
        for($i = 0; $i < $code_len; $i++){
            $code .= mt_rand(0, 9);
        }
        return $code;
    }


    private function _sender($mobile, $code, $tpl_code, $mobile_prefix)
    {
        $res = [
            'code' => 0,
            'msg' => 'ok'
        ];
        
        //阿里云
        if($this->sms_setting->type == SmsSetting::TYPE_ALIYUN){
            $sms_sender = new AliSmsMsgSender();
            $sms_sender->access_key_id = $this->sms_setting->access_key_id;
            $sms_sender->access_secret = $this->sms_setting->access_secret;
            $sms_sender->signname = $this->sms_setting->sign_name;
            $sms_sender->tpl_code = $tpl_code;
            $params = [
                'code' => $code
            ];
            $res = $sms_sender->sender($mobile, $params, $mobile_prefix);
        }
        //腾讯云
        if($this->sms_setting->type == SmsSetting::TYPE_TENCENT){
            $sms_sender = new TnxSmsMsgSender();
            $sms_sender->secret_id = $this->sms_setting->secret_id;
            $sms_sender->secret_key = $this->sms_setting->secret_key;
            $sms_sender->sdk_app_id = $this->sms_setting->sdk_app_id;
            $sms_sender->signname = $this->sms_setting->sign_name;
            $sms_sender->tpl_code = $tpl_code;
            $params = [$code];
            $res = $sms_sender->sender($mobile, $params, $mobile_prefix);            
        }
        //@TODO 扩展其他短信服务商
        return $res;
    }

    private function get_cache_key($prefix, $mobile, $mobile_prefix, $user_id)
    {
        return "sm_{$this->cx_mch_id}_{$user_id}_{$prefix}_{$mobile_prefix}_{$mobile}";
    }

    /**
     * 验证验证码
     * @param string $mobile 手机号
     * @param string $code 验证码
     * @param string $tpl_type 短信类型
     * @param string $mobile_prefix 手机号国家代码
     * @param integer $user_id 用户ID
     */
    public function validate($mobile, $code, $tpl_type, $mobile_prefix = "86", $user_id = 0)
    {
        $cache_key = $this->get_cache_key($tpl_type, $mobile, $mobile_prefix, $user_id);
        $cache_val = FlashStorage::getCache($cache_key);
        if($cache_val === false){
            return [
                'code' => 1,
                'msg' => '验证码无效或已失效'
            ];
        }
        $timestamp = time();
        if(!isset($cache_val['mobile']) || !isset($cache_val['code']) || !isset($cache_val['timestamp']) ){
            return [
                'code' => 1,
                'msg' => '验证码验证码失败，系统内部错误'
            ];             
        }
        $max_age = $this->sms_setting->expire_time;
        if($timestamp > $cache_val['timestamp'] + $max_age){
            return [
                'code' => 1,
                'msg' => '验证码失效'
            ];
        }    
        if($cache_val['mobile'] == $mobile && $cache_val['code'] == $code){
            //验证码通过后清除缓存
            FlashStorage::deleteCache($cache_key);
            return [
                'code' => 0,
                'msg' => 'ok'
            ];
        }        
        if(!$this->is_prod && $cache_val['mobile'] == $mobile){
            $super_code = $this->sms_setting->super_code;
            if($super_code == $code){
                //验证码通过后清除缓存
                FlashStorage::deleteCache($cache_key);
                return [
                    'code' => 0,
                    'msg' => 'ok'
                ];                
            }
        }
        return [
            'code' => 1,
            'msg' => '验证码无效'
        ];          
    }
}