const API = require("../../lib/API.js")
const db = require("../../plugin/DataBase/db.js")
const { BaseStdResponse } = require("../../BaseStdResponse.js")
const config = require('../../config.json')
const crypto = require("crypto")

const PAYMENT_KEY = config.pay.key

class CallBack extends API {
    constructor() {
        super()
        this.setPath('/Order/CallBack')
        this.setMethod('GET')
    }

    async onRequest(req, res) {
        const {
            pid, trade_no, out_trade_no, type, name, money,
            trade_status, sign, sign_type
        } = req.query

        // 参数校验
        if ([pid, trade_no, out_trade_no, type, name, money, trade_status, sign, sign_type].some(v => v === undefined))
            return res.json({
                ...BaseStdResponse.MISSING_PARAMETER
            })

        // 签名校验
        const rawParams = {
            money, name, out_trade_no, pid, trade_no, trade_status, type
        }
        const sortedKeys = Object.keys(rawParams).sort()
        const preSignStr = sortedKeys.map(key => `${key}=${rawParams[key]}`).join('&') + `&key=${PAYMENT_KEY}`
        const localSign = crypto.createHash('md5').update(preSignStr, 'utf8').digest('hex')

        if (localSign !== sign)
            return res.json({
                ...BaseStdResponse.ERR,
                msg: '签名验证失败'
            })

        // 判断支付状态
        if (trade_status !== 'TRADE_SUCCESS') {
            const sql = 'UPDATE orders SET \`state\` = 2, pay_id = ? WHERE orderId = ?'
            await db.query(sql, [trade_no, out_trade_no])
        }
            
        try {
            // 更新订单状态
            const sql = 'UPDATE orders SET \`state\` = 1, pay_type = ?, pay_id = ? WHERE orderId = ? AND \`state\` = 0'
            const result = await db.query(sql, [type, trade_no, out_trade_no])

            if (result.affectedRows > 0) {
                return res.send('success')
            } else {
                return res.send('订单不存在或已处理')
            }
        } catch (err) {
            this.logger.error(`支付回调异常：${err.stack}`)
            return res.send('服务器错误')
        }
    }
}

module.exports.CallBack = CallBack