<?php

require_once dirname(__FILE__) . "/lib/WxPay.Api.php";

/**
 *
 * APP支付实现类
 * @author widyhu
 *
 */
class AppPay
{
	/**
	 *
	 * 参数数组转换为url参数
	 * @param array $urlObj
	 */
	private function ToUrlParams($urlObj)
	{
		$buff = "";
		foreach ($urlObj as $k => $v)
		{
			$buff .= $k . "=" . $v . "&";
		}

		$buff = trim($buff, "&");
		return $buff;
	}

	/**
	 * 生成直接支付url，支付url有效期为2小时,模式二
	 * @param WxPayUnifiedOrder $input
	 * @param array $wechatInfo
	 * @return array
	 * @throws WxPayException
	 */
	public function GetPayPrepayId($input, $wechatInfo)
	{
		if ($input->GetTrade_type() == "APP")
		{
			$result = WxPayApi::unifiedOrder($input, 6, $wechatInfo);
			return $result;
		}
	}


	/**
	 *
	 * 获取app支付的参数
	 * @param array $UnifiedOrderResult 统一支付接口返回的数据
	 * @param array $weixinInfo 微信公众号相关信息
	 * @throws WxPayException
	 *
	 * @return string json数据，可直接填入js函数作为参数
	 */
	public function GetAppApiParameters($UnifiedOrderResult, $weixinInfo)
	{
		if(!array_key_exists("appid", $UnifiedOrderResult)
			|| !array_key_exists("prepay_id", $UnifiedOrderResult)
			|| $UnifiedOrderResult['prepay_id'] == "")
		{
			throw new WxPayException("参数错误");
		}

		$appapi = new WxPayAppApiPay();
		$appapi->SetAppid($UnifiedOrderResult["appid"]);
		$appapi->SetPartnerId($UnifiedOrderResult["mch_id"]);
		$appapi->SetPrepayId($UnifiedOrderResult["prepay_id"]);
		$timeStamp = time();
		$appapi->SetTimeStamp($timeStamp);
		$appapi->SetNonceStr(WxPayApi::getNonceStr());
		$appapi->SetPackage("Sign=WXPay");
		$appapi->SetSign($appapi->MakeSign($weixinInfo));
		$back_arr=$appapi->GetValues();
		$back_arr['prepay_id']=$UnifiedOrderResult["prepay_id"];
		$parameters = json_encode($appapi->GetValues());
		return $parameters;
	}
}