const cloud = require('wx-server-sdk')
cloud.init({
  env: cloud.DYNAMIC_CURRENT_ENV
})

exports.main = async (event, context) => {    
const res = await cloud.cloudPay.unifiedOrder({
    "body" : event.body,
    "outTradeNo" : event.outTradeNo,
    "spbillCreateIp" : "127.0.0.1",
    "subMchId" : "0000000000",               //這里要注意：雖然key是子商戶id，實(shí)際上就是普通商戶id
    "totalFee" : parseInt(event.totalFee),   //第二個坑：注意必須是數(shù)字，如果不是數(shù)字，則會報錯unifiedOrder:fail wx api error: -202
    "envId": "ooo-xxxxxxxxxxxxxxxx",                //這里是回調(diào)函數(shù)所屬的的云環(huán)境id
    "functionName": "payCallBack",        //這個是回調(diào)函數(shù)名
    "nonceStr":event.nonceStr,            //第三個坑：官方文檔中相關(guān)云函數(shù)代碼沒有nonceStr和tradeType，測試的時候會報nonceStr不存在的錯，翻看文檔才發(fā)現(xiàn)這個是必填項(xiàng)，直接粘過來以后還需要加上這兩個參數(shù)
    "tradeType":"JSAPI"
  })
  return res
}

//調(diào)用云函數(shù)，微信統(tǒng)一下單
  cloudPay(){
    var _this = this
    this.setData({
      body: "賬單支付-xxxxx",
      outTradeNo: this.data.id+"-"+util.uuid(16),
      totalFee: this.data.totalCost*100 //支付單位：分
    })
    app.showLoading(true)
    wx.cloud.callFunction({
      name: "pay",
      data: {
        body: _this.data.body,
        outTradeNo: _this.data.outTradeNo,
        totalFee: _this.data.totalFee,
        nonceStr:util.uuid(32)//調(diào)用自己的uuid函數(shù)
      },
      success(res) {
        // errCode: 0
        // errMsg: "cloudPay.unifiedOrder:ok"
        // returnCode: "FAIL"
        // returnMsg: "total_fee is empty. "
        console.log("提交成功", res.result)
        if(res.result.returnCode!="SUCCESS"){
          app.showToast(res.result.returnMsg)
          return
        }
        _this.unifiedOrder(res.result)
        // _this.requestPayment(res.result)
      },
      fail(res) {
        console.log("提交失敗", res)
      }
    })
  },

  //官方標(biāo)準(zhǔn)的支付方法，調(diào)起支付界面
  requestPayment(payData) {
    var _this = this;
    const payment = payData.payment//這里注意，上一個函數(shù)的result中直接整合了這里要用的參數(shù)，直接展開即可使用
    wx.requestPayment({
      ...payment,   //...是展開變量的語法 
      success(res) {
        console.log("支付成功", res)
        _this.paySuccess()
      },
      fail(res) {
        console.log("支付失敗", res)
      }
    })
  },