<?php

namespace common\components;

use common\services\xhMerchantService;
use linslin\yii2\curl;
use yii\helpers\Json;

class jsSDK
{
	
	public function getMiniSignPackage()
	{
		$jsapiTicket = $this->getJsApiTicket($merchant);
		$url = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
		$timestamp = time();
		$nonceStr = $this->createNonceStr();
		$string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";// 这里参数的顺序要按照 key 值 ASCII 码升序排序
		$signature = sha1($string);
		$appId = $merchant['miniAppId'];
		$signPackage = array(
			"appId" => $appId,
			"nonceStr" => $nonceStr,
			"timestamp" => $timestamp,
			"url" => $url,
			"signature" => $signature,
			"rawString" => $string
		);
		return $signPackage;
	}
	
	public function getSignPackage($merchant, $url)
	{
		$jsapiTicket = $this->getJsApiTicket($merchant);
		//$url 当前网页的URL，不包含#及其后面部分
		$pos = strpos($url, '#');
		if ($pos !== false) {
			$url = substr($url, 0, $pos);
		}
		$timestamp = time();
		$nonceStr = $this->createNonceStr();
		$string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";// 这里参数的顺序要按照 key 值 ASCII 码升序排序
		$signature = sha1($string);
		$appId = !empty($merchant) && !empty($merchant['wxAppId']) ? $merchant['wxAppId'] : '';
		$signPackage = array(
			"appId" => $appId,
			"nonceStr" => $nonceStr,
			"timestamp" => $timestamp,
			"url" => $url,
			"signature" => $signature,
			"rawString" => $string
		);
		return $signPackage;
	}
	
	private function createNonceStr($length = 16)
	{
		$chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
		$str = "";
		for ($i = 0; $i < $length; $i++) {
			$str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
		}
		return $str;
	}
	
	private function getJsApiTicket($merchant)
	{
		$now = time();
		$sjId = $merchant['id'];
		if (!empty($merchant) && !empty($merchant['wxJsApiTicket']) && ($now < strtotime($merchant['wxJsApiTicketExpire']))) {
			return $merchant['wxJsApiTicket'];
		} else {
			$accessToken = wxUtil::getAuthorizerAccessToken($merchant);
			$url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
			$curl = new curl\Curl();
			$result = $curl->get($url);
			$res = Json::decode($result);
			if (isset($res['ticket'])) {
				$expireTime = (int)($now + $res['expires_in']);
				$uData['wxJsApiTicket'] = $res['ticket'];
				$uData['wxJsApiTicketExpire'] = date("Y-m-d H:i:s", $expireTime);
				xhMerchantService::updateById($sjId, $uData);
				return $res['ticket'];
			}
			return '';
		}
	}
	
}