<?php
namespace iboxs\payment\wxpay;
class App
{
    const API_URL_PREFIX = 'https://api.mch.weixin.qq.com';
    const UNIFIEDORDER_URL = "/pay/unifiedorder";
    const ORDERQUERY_URL = "/pay/orderquery";
    const CLOSEORDER_URL = "/pay/closeorder";
    private $appid;
    private $mch_id;
    private $nonce_str;
    private $sign;
    private $body;
    private $out_trade_no;
    private $total_fee;
    private $spbill_create_ip;
    private $notify_url;
    private $trade_type;
    private $key;
    private $SSLCERT_PATH;
    private $SSLKEY_PATH;
    //所有参数
    private $params = array();
    public function __construct()
    {
        $this->appid = '';
        $this->mch_id = '';
        $this->notify_url = '';
        $this->key = '';
    }
    /**
    * 下单方法
    * @param   $params 下单参数
    */
    public function unifiedOrder( $params )
    {
        $this->body = $params['body'];
        $this->out_trade_no = $params['out_trade_no'];
        $this->total_fee = $params['total_fee'];
        $this->trade_type = $params['trade_type'];
        $this->nonce_str = $this->genRandomString();
        $this->spbill_create_ip = $_SERVER['REMOTE_ADDR'];
        $this->params['appid'] = $this->appid;
        $this->params['mch_id'] = $this->mch_id;
        $this->params['nonce_str'] = $this->nonce_str;
        $this->params['body'] = $this->body;
        $this->params['out_trade_no'] = $this->out_trade_no;
        $this->params['total_fee'] = $this->total_fee;
        $this->params['spbill_create_ip'] = $this->spbill_create_ip;
        $this->params['notify_url'] = $params['notify_url'];
        $this->params['trade_type'] = $this->trade_type;
        //获取签名数据
        $this->sign = $this->MakeSign( $this->params );
        $this->params['sign'] = $this->sign;
        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::UNIFIEDORDER_URL);
        if( !$response )
        {
            return false;
        }
        $result = $this->xml_to_data( $response );

        if( !empty($result['result_code']) && !empty($result['err_code']) )
        {
            return $result['err_msg'] = $this->error_code( $result['err_code'] );
        }
        else
        {
            return $this->getAppPayParams($result['prepay_id']);
        }

    }
    /**
    * 查询订单信息
    * @param $out_trade_no     订单号
    * @return array
    */
    public function orderQuery( $out_trade_no )
    {
        $this->params['appid'] = $this->appid;
        $this->params['mch_id'] = $this->mch_id;
        $this->params['nonce_str'] = $this->genRandomString();
        $this->params['out_trade_no'] = $out_trade_no;
        //获取签名数据
        $this->sign = $this->MakeSign( $this->params );
        $this->params['sign'] = $this->sign;
        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::ORDERQUERY_URL);
        if( !$response )
        {
            return false;
        }
        $result = $this->xml_to_data( $response );
        if( !empty($result['result_code']) && !empty($result['err_code']) )
        {
            $result['err_msg'] = $this->error_code( $result['err_code'] );
        }
        return $this->getAppPayParams($result['prepay_id']);
    }
    /**
    * 关闭订单
    * @param $out_trade_no     订单号
    * @return array
    */
    public function closeOrder( $out_trade_no )
    {
        $this->params['appid'] = $this->appid;
        $this->params['mch_id'] = $this->mch_id;
        $this->params['nonce_str'] = $this->genRandomString();
        $this->params['out_trade_no'] = $out_trade_no;
        //获取签名数据
        $this->sign = $this->MakeSign( $this->params );
        $this->params['sign'] = $this->sign;
        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::CLOSEORDER_URL);
        if( !$response )
        {
        return false;
        }
        $result = $this->xml_to_data( $response );
        return $result;
    }
    /**
    *
    * 获取支付结果通知数据
    * return array
    */
    public function getNotifyData()
    {
        //获取通知的数据
        //$xml = $GLOBALS['HTTP_RAW_POST_DATA'];
        $xml = file_get_contents("php://input");
        $data = array();
        if( empty($xml) )
        {
            return false;
        }
        $data = $this->xml_to_data( $xml );
        if( !empty($data['return_code']) )
        {
            if( $data['return_code'] == 'FAIL' )
            {
                return false;
            }
        }
        return $data;
    }
    /**
    * 接收通知成功后应答输出XML数据
    * @param string $xml
    */
    public function replyNotify()
    {
        $data['return_code'] = 'SUCCESS';
        $data['return_msg'] = 'OK';
        $xml = $this->data_to_xml( $data );
        echo $xml;
        die();
    }
    /**
    * 生成APP端支付参数
    * @param  $prepayid   预支付id
    */
    public function getAppPayParams( $prepayid )
    {
        $data['appid'] = $this->appid;
        $data['partnerid'] = $this->mch_id;
        $data['prepayid'] = $prepayid;
        $data['package'] = 'Sign=WXPay';
        $data['noncestr'] = $this->genRandomString();
        $data['timestamp'] = time();
        $data['sign'] = $this->MakeSign( $data );
        return $data;
    }
    /**
    * 生成签名
    *  @return 签名
    */
    public function MakeSign( $params )
    {
        //签名步骤一：按字典序排序数组参数
        ksort($params);
        $string = $this->ToUrlParams($params);
        //签名步骤二：在string后加入KEY
        $string = $string . "&key=".$this->key;
        //签名步骤三：MD5加密
        $string = md5($string);
        //签名步骤四：所有字符转为大写
        $result = strtoupper($string);
        return $result;
    }
    /**
    * 将参数拼接为url: key=value&key=value
    * @param   $params
    * @return  string
    */
    public function ToUrlParams( $params )
    {
        $string = '';
        if( !empty($params) )
        {
            $array = array();
            foreach( $params as $key => $value )
            {
                $array[] = $key.'='.$value;
            }
            $string = implode("&",$array);
        }
        return $string;
    }
    /**
    * 输出xml字符
    * @param   $params     参数名称
    * return   string      返回组装的xml
    **/
    public function data_to_xml( $params )
    {
        if(!is_array($params)|| count($params) <= 0)
        {
         return false;
        }
        $xml = "<xml>";
        foreach ($params as $key=>$val)
        {
            if (is_numeric($val))
            {
                $xml.="<".$key.">".$val."</".$key.">";
            }
            else
            {
                $xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
            }
        }
        $xml.="</xml>";
        return $xml;
    }
    /**
    * 将xml转为array
    * @param string $xml
    * return array
    */
    public function xml_to_data($xml)
    {
        if(!$xml)
        {
            return false;
        }
        //将XML转为array
        //禁止引用外部xml实体
        libxml_disable_entity_loader(true);
        $data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        return $data;
    }
    /**
    * 获取毫秒级别的时间戳
    */
    private static function getMillisecond()
    {
        //获取毫秒的时间戳
        $time = explode ( " ", microtime () );
        $time = $time[1] . ($time[0] * 1000);
        $time2 = explode( ".", $time );
        $time = $time2[0];
        return $time;
    }
    /**
    * 产生一个指定长度的随机字符串,并返回给用户
    * @param type $len 产生字符串的长度
    * @return string 随机字符串
    */
    private function genRandomString($len = 32)
    {
        $chars = array(
        "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k",
        "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v",
        "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G",
        "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R",
        "S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2",
        "3", "4", "5", "6", "7", "8", "9"
        );
        $charsLen = count($chars) - 1;
        // 将数组打乱
        shuffle($chars);
        $output = "";
        for ($i = 0; $i < $len; $i++)
        {
            $output .= $chars[mt_rand(0, $charsLen)];
        }
        return $output;
    }
    /**
    * 以post方式提交xml到对应的接口url
    *
    * @param string $xml  需要post的xml数据
    * @param string $url  url
    * @param bool $useCert 是否需要证书，默认不需要
    * @param int $second   url执行超时时间，默认30s
    * @throws WxPayException
    */
    private function postXmlCurl($xml, $url, $useCert = false, $second = 30)
    {
        $ch = curl_init();
        //设置超时
        curl_setopt($ch, CURLOPT_TIMEOUT, $second);
        curl_setopt($ch,CURLOPT_URL, $url);
        curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
        curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2);
        //设置header
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        //要求结果为字符串且输出到屏幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        if($useCert == true){
        //设置证书
        //使用证书：cert 与 key 分别属于两个.pem文件
        curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
        //curl_setopt($ch,CURLOPT_SSLCERT, WxPayConfig::SSLCERT_PATH);
        curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
        //curl_setopt($ch,CURLOPT_SSLKEY, WxPayConfig::SSLKEY_PATH);
        }
        //post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        //运行curl
        $data = curl_exec($ch);
        //返回结果
        if($data)
        {
            curl_close($ch);
            return $data;
        }
        else
        {
            $error = curl_errno($ch);
            curl_close($ch);
            return false;
        }
    }
    /**
    * 错误代码
    * @param  $code       服务器输出的错误代码
    * return string
    */
    public function error_code( $code )
    {
        $errList = array(
        'NOAUTH'                =>  '商户未开通此接口权限',
        'NOTENOUGH'             =>  '用户帐号余额不足',
        'ORDERNOTEXIST'         =>  '订单号不存在',
        'ORDERPAID'             =>  '商户订单已支付，无需重复操作',
        'ORDERCLOSED'           =>  '当前订单已关闭，无法支付',
        'SYSTEMERROR'           =>  '系统错误!系统超时',
        'APPID_NOT_EXIST'       =>  '参数中缺少APPID',
        'MCHID_NOT_EXIST'       =>  '参数中缺少MCHID',
        'APPID_MCHID_NOT_MATCH' =>  'appid和mch_id不匹配',
        'LACK_PARAMS'           =>  '缺少必要的请求参数',
        'OUT_TRADE_NO_USED'     =>  '同一笔交易不能多次提交',
        'SIGNERROR'             =>  '参数签名结果不正确',
        'XML_FORMAT_ERROR'      =>  'XML格式错误',
        'REQUIRE_POST_METHOD'   =>  '未使用post传递参数 ',
        'POST_DATA_EMPTY'       =>  'post数据不能为空',
        'NOT_UTF8'              =>  '未使用指定编码格式',
        );
        if( array_key_exists( $code , $errList ) )
        {
            return $errList[$code];
        }
    }
}