const cloud = require('wx-server-sdk')
cloud.init()const app = require('tcb-admin-node');const pay = require('./lib/pay');const {
 mpAppId,
 KEY
} = require('./config/index');const {
 WXPayConstants,
 WXPayUtil
} = require('wx-js-utils');const Res = require('./lib/res');const ip = require('ip');/**
 *
 * @param {obj} event
 * @param {string} event.type 功能类型
 * @param {} userInfo.openId 用户的openid
 */exports.main = async function(event, context) { const {
  type,
  data,
  userInfo
 } = event; const wxContext = cloud.getWXContext() const openid = userInfo.openId;
 
 app.init(); const db = app.database(); const goodCollection = db.collection('goods'); const orderCollection = db.collection('order'); // 订单文档的status 0 未支付 1 已支付 2 已关闭
 switch (type) {  // [在此处放置 unifiedorder 的相关代码]
  case 'unifiedorder':
   {    // 查询该商品 ID 是否存在于数据库中，并将数据提取出来
    const goodId = data.goodId    let goods = await goodCollection.doc(goodId).get();    if (!goods.data.length) {     return new Res({      code: 1,      message: '找不到商品'
     });
    }    // 在云函数中提取数据，包括名称、价格才更合理安全，
    // 因为从端里传过来的商品数据都是不可靠的
    let good = goods.data[0];    // 拼凑微信支付统一下单的参数
    const curTime = Date.now();    const tradeNo = `${goodId}-${curTime}`;    const body = good.name;    const spbill_create_ip = ip.address() || '127.0.0.1';    // 云函数暂不支付 http 触发器，因此这里回调 notify_url 可以先随便填。
    const notify_url = 'http://www.qq.com'; //'127.0.0.1';
    const total_fee = good.price;    const time_stamp = '' + Math.ceil(Date.now() / 1000);    const out_trade_no = `${tradeNo}`;    const sign_type = WXPayConstants.SIGN_TYPE_MD5;    let orderParam = {
     body,
     spbill_create_ip,
     notify_url,
     out_trade_no,
     total_fee,
     openid,     trade_type: 'JSAPI',     timeStamp: time_stamp,
    };    // 调用 wx-js-utils 中的统一下单方法
    const {
     return_code,
     ...restData
    } = await pay.unifiedOrder(orderParam);    let order_id = null;    if (return_code === 'SUCCESS' && restData.result_code === 'SUCCESS') {     const {
      prepay_id,
      nonce_str
     } = restData;     // 微信小程序支付要单独进地签名，并返回给小程序端
     const sign = WXPayUtil.generateSignature({      appId: mpAppId,      nonceStr: nonce_str,      package: `prepay_id=${prepay_id}`,      signType: 'MD5',      timeStamp: time_stamp
     }, KEY);     let orderData = {
      out_trade_no,
      time_stamp,
      nonce_str,
      sign,
      sign_type,
      body,
      total_fee,
      prepay_id,
      sign,      status: 0, // 订单文档的status 0 未支付 1 已支付 2 已关闭
      _openid: openid,
     };     let order = await orderCollection.add(orderData);
     order_id = order.id;
    }    return new Res({     code: return_code === 'SUCCESS' ? 0 : 1,     data: {
      out_trade_no,
      time_stamp,
      order_id,
      ...restData
     }
    });
   }   // [在此处放置 payorder 的相关代码]
  case 'payorder':
   {    // 从端里出来相关的订单相信
    const {
     out_trade_no,
     prepay_id,
     body,
     total_fee
    } = data;    // 到微信支付侧查询是否存在该订单，并查询订单状态，看看是否已经支付成功了。
    const {
     return_code,
     ...restData
    } = await pay.orderQuery({
     out_trade_no
    });    // 若订单存在并支付成功，则开始处理支付
    if (restData.trade_state === 'SUCCESS') {     let result = await orderCollection
      .where({
       out_trade_no
      })
      .update({       status: 1,       trade_state: restData.trade_state,       trade_state_desc: restData.trade_state_desc
      });     let curDate = new Date();     let time = `${curDate.getFullYear()}-${curDate.getMonth() +          1}-${curDate.getDate()} ${curDate.getHours()}:${curDate.getMinutes()}:${curDate.getSeconds()}`;
   
    }    return new Res({     code: return_code === 'SUCCESS' ? 0 : 1,     data: restData
    });
   }  case 'orderquery':
   {    const {
     transaction_id,
     out_trade_no
    } = data;    // 查询订单
    const {     data: dbData
    } = await orderCollection
    .where({
     out_trade_no
    })
    .get();    const {
     return_code,
     ...restData
    } = await pay.orderQuery({
     transaction_id,
     out_trade_no
    });    return new Res({     code: return_code === 'SUCCESS' ? 0 : 1,     data: { ...restData,
      ...dbData[0]
     }
    });
   }  case 'closeorder':
   {    // 关闭订单
    const {
     out_trade_no
    } = data;    const {
     return_code,
     ...restData
    } = await pay.closeOrder({
     out_trade_no
    });    if (return_code === 'SUCCESS' &&
     restData.result_code === 'SUCCESS') {     await orderCollection
      .where({
       out_trade_no
      })
      .update({       status: 2,       trade_state: 'CLOSED',       trade_state_desc: '订单已关闭'
      });
    }    return new Res({     code: return_code === 'SUCCESS' ? 0 : 1,     data: restData
    });
   }
 }
}