let parse = function (req) {
  try {
    let result = JSON.parse(req.responseText)
  } catch (e) {
    let result = req.responseText
  }
  return result
}

let xhr = function (type, url, data) {
  return new Promise(function(resolve, reject) {
    var XHR = window.XMLHttpRequest || ActiveXObject
    var request = new XHR('MSXML2.XMLHTTP.3.0')
    request.open(type, url, true)
    request.setRequestHeader('Content-type', 'application/json; charset=utf-8')
    request.onreadystatechange = function () {
      if (request.readyState === 4) {
        if (request.status === 200)
          resolve(parse(request))
        else
          reject(parse(request))
      }
    }
    request.send(data)
  })
}

let post = function(url, data, json) {
    if (json) {
        return xhr('POST', url, JSON.stringify(data))
    }else{
        return xhr('POST', url, data)
    }
}

let get = function(url) {
  return xhr('GET', url)
}


// fake bridges
const currentDomain = location.protocol + "//" + location.host;

const ALIPAY_NOTIFY_URL = currentDomain + '/alipayNotify';

window.AlipayJSBridge = AlipayJSBridge = {}

AlipayJSBridge.call = function(type, payload, callback){
    if (type == "tradePay"){
        console.info('tradePay payload');
        console.group();
        console.dir(payload)
        callback({"resCode": "9000"})
    }
}

window.WeixinJSBridge = WeixinJSBridge = {}

const WECHAT_NOTIFY_URL = currentDomain + '/finishedPay';

let WECHAT_NOTIFY_PAYLOAD = `
    <xml>
      <appid><![CDATA[<%= appid %>]]></appid>
      <attach><![CDATA[支付测试]]></attach>
      <bank_type><![CDATA[CFT]]></bank_type>
      <fee_type><![CDATA[CNY]]></fee_type>
      <is_subscribe><![CDATA[Y]]></is_subscribe>
      <mch_id><![CDATA[<%= mch_id %>]]></mch_id>
      <nonce_str><![CDATA[<%= nonce_str %>]]></nonce_str>
      <openid><![CDATA[<%= openid %>]]></openid>
      <out_trade_no><![CDATA[<%= out_trade_no %>]]></out_trade_no>
      <result_code><![CDATA[SUCCESS]]></result_code>
      <return_code><![CDATA[SUCCESS]]></return_code>
      <sign><![CDATA[<%= sign %>]]></sign>
      <sub_mch_id><![CDATA[10000100]]></sub_mch_id>
      <time_end><![CDATA[20140903131540]]></time_end>
      <total_fee><%= total_fee %></total_fee><coupon_fee><![CDATA[10]]]></coupon_fee>
      <coupon_count><![CDATA[1]]></coupon_count>
      <coupon_type><![CDATA[CASH]]></coupon_type>
      <coupon_id><![CDATA[10000]]></coupon_id>
      <coupon_fee_0><![CDATA[100]]></coupon_fee_0>
      <trade_type><![CDATA[JSAPI]]></trade_type>
      <transaction_id><![CDATA[<%= transaction_id %>]]></transaction_id>
    </xml>`


WeixinJSBridge.invoke = function(type, payload, callback){
    if (type == "getBrandWCPayRequest"){
        console.info('wechat::getBrandWCPayRequest payload');
        console.dir(payload)
        callback({"err_msg": "get_brand_wcpay_request:ok"});
        let payloadTemplate = _.template(WECHAT_NOTIFY_PAYLOAD);
        let rawMockPayload = /\{.*\}/g.exec(payload.package)[0];
        let mockPayload = JSON.parse(rawMockPayload)
        let notifyPayload = payloadTemplate(
            {
                'mch_id': mockPayload.mch_id,
                'sign': payload.sign,
                'total_fee': mockPayload.total_fee,
                'openid': mockPayload.openid,
                'appid': payload.appId,
                'transaction_id': mockPayload.transaction_id,
                'nonce_str': payload.nonceStr,
                'out_trade_no': mockPayload.out_trade_no

            }
        )
        console.info('sending wechat finish pay receipt')
        $.post(WECHAT_NOTIFY_URL, notifyPayload)
    }
}