function Aberration(q, e, symbol, period, upRatio, downRatio, opAmount) {
    var self = {}
    self.q = q
    self.e = e
    self.symbol = symbol
    self.upTrack = 0
    self.middleTrack = 0
    self.downTrack = 0
    self.nPeriod = period
    self.upRatio = upRatio
    self.downRatio = downRatio
    self.opAmount = opAmount
    self.marketPosition = 0

    self.lastErrMsg = ''
    self.lastErrTime = ''
    self.lastBar = {
        Time: 0,
        Open: 0,
        High: 0,
        Low: 0,
        Close: 0,
        Volume: 0
    }
    self.symbolDetail = null
    self.lastBarTime = 0
    self.tradeCount = 0
    self.isBusy = false

    self.setLastError = function(errMsg) {
        self.lastErrMsg = errMsg
        self.lastErrTime = errMsg.length > 0 ? _D() : ''
    }

    self.getStatus = function() {
        return [self.symbol, self.opAmount, self.upTrack, self.downTrack, self.middleTrack, _N(self.lastBar.Close), (self.marketPosition == 0 ? "--" : (self.marketPosition > 0 ?
                   "Long#ff0000" : "short#0000ff")), self.tradeCount, self.lastErrMsg, self.lastErrTime]
    }
    self.getMarket = function() {
        return [self.symbol, _D(self.lastBarTime), _N(self.lastBar.Open), _N(self.lastBar.High), _N(self.lastBar.Low), _N(self.lastBar.Close), self.lastBar.Volume]
    }

    self.restore = function(positions) {
        for (var i = 0; i < positions.length; i++) {
            if (positions[i].ContractType == self.symbol) {
                self.marketPosition += positions[i].Amount * ((positions[i].Type == PD_LONG || positions[i].Type == PD_LONG_YD) ? 1 : -1)
            }
        }
        if (self.marketPosition !== 0) {
            self.tradeCount++
                Log("restore", self.symbol, "Current position is", self.marketPosition)
        }
    }

    self.poll = function() {
        if (self.isBusy) {
            return false
        }

        if (!$.IsTrading(self.symbol)) {
            self.setLastError("Not in trading hours")
            return false
        }

        if (!self.e.IO("status")) {
            self.setLastError("Unconnected exchange")
            return false
        }

        var detail = self.e.SetContractType(self.symbol)
        if (!detail) {
            self.setLastError("Switching contract failed")
            return false
        }
        if (!self.symbolDetail) {
            self.symbolDetail = detail
            Log("contract", detail.InstrumentName.replace(/\s+/g, ""), ", Strategy first time to open a position:", self.opAmount, "hand, one hand", detail.VolumeMultiple, "unit, Maximum order quantity",
                detail.MaxLimitOrderVolume, "Margin rate:", detail.LongMarginRatio.toFixed(4), detail.ShortMarginRatio.toFixed(4), "Delivery date", detail.StartDelivDate);
        }
        var records = self.e.GetRecords()
        if (!records || records.length == 0) {
            self.setLastError("Failed to get the bar line")
            return false
        }

        var bar = records[records.length - 1]
        self.lastBar = bar

        if (records.length <= self.nPeriod) {
            self.setLastError("The length of the bar line is not enough")
            return false
        }

        if (self.lastBarTime < bar.Time) {
            var sum = 0
            var pos = records.length - self.nPeriod - 1
            for (var i = pos; i < records.length - 1; i++) {
                sum += records[i].Close
            }
            var avg = sum / self.nPeriod
            var std = 0
            for (i = pos; i < records.length - 1; i++) {
                std += Math.pow(records[i].Close - avg, 2)
            }
            std = Math.sqrt(std / self.nPeriod)

            self.upTrack = _N(avg + (self.upRatio * std))
            self.downTrack = _N(avg - (self.downRatio * std))
            self.middleTrack = _N(avg)
            self.lastBarTime = bar.Time
        }
        var msg
        var act = ""
        if (self.marketPosition == 0) {
            if (bar.Close > self.upTrack) {
                msg = 'Buying Long trigger price: ' + bar.Close + ' Upper rail:' + self.upTrack;
                act = "buy"
            } else if (bar.Close < self.downTrack) {
                msg = 'Selling short trigger price: ' + bar.Close + ' lower rail:' + self.downTrack;
                act = "sell"
            }
        } else {
            if (self.marketPosition < 0 && bar.Close > self.middleTrack) {
                msg = 'close the short position trigger price: ' + bar.Close + ' close position line:' + self.middleTrack;
                act = "closesell"
            } else if (self.marketPosition > 0 && bar.Close < self.middleTrack) {
                msg = 'close the long position trigger price: ' + bar.Close + ' close position line:' + self.middleTrack;
                act = "closebuy"
            }
        }

        if (act == "") {
            return true
        }

        Log(self.symbol + ', ' + msg + (NotifyWX ? '@' : ''))

        self.isBusy = true
        self.tradeCount += 1
        if (self.lastErrMsg != '') {
            self.setLastError('')
        }
        self.q.pushTask(self.e, self.symbol, act, self.opAmount, function(task, ret) {
            self.isBusy = false
            if (!ret) {
                return
            }
            if (task.action == "buy") {
                self.marketPosition = 1
            } else if (task.action == "sell") {
                self.marketPosition = -1
            } else {
                self.marketPosition = 0
            }
        })
    }
    return self
}

function main() {
    if (exchange.GetName() !== 'Futures_CTP') {
        throw "Only support traditional commodity futures(CTP)"
    }
    
    SetErrorFilter("login|ready|initialization")

    LogStatus("Ready...")
    if (Reset) {
        LogProfitReset()
        LogReset()
    }
    
    // Ref: https://www.botvs.com/bbs-topic/362
    if (typeof(exchange.IO("mode", 0)) == 'number') {
        Log("Switching the market mode successfully")
    }

    LogStatus("Waiting to connect with the futures dealer server..")
    while (!exchange.IO("status")) {
        Sleep(500)
    }
    LogStatus("Get asset information")
    var tblRuntime = {
        type: 'table',
        title: 'Trading Information',
        cols: ['Variety', 'Each open position volume', 'upper rail', 'lower rail', 'middle rail', 'last transaction price', 'position', 'transaction count', 'last error', 'error time'],
        rows: []
    };
    var tblMarket = {
        type: 'table',
        title: 'Quote information',
        cols: ['Variety', 'current cycle', 'opening', 'highest', 'lowest', 'last transaction price', 'volume'],
        rows: []
    };
    var tblPosition = {
        type: 'table',
        title: 'Position information',
        cols: ['Variety', 'leverage', 'direction', 'average price', 'quantity', 'holding profit and loss'],
        rows: []
    };
    var positions = _C(exchange.GetPosition)
    if (positions.length > 0 && !AutoRestore) {
        throw "There can be no positions when the program starts, but you can check the automatic recovery for automatic identification!"
    }
    var initAccount = _C(exchange.GetAccount)
    var detail = JSON.parse(exchange.GetRawJSON())
    if (positions.length > 0) {
        initAccount.Balance += detail['CurrMargin']
    }
    var initNetAsset = detail['CurrMargin'] + detail['Available']
    var initAccountTbl = $.AccountToTable(exchange.GetRawJSON(), "Initial funding")

    if (initAccountTbl.rows.length == 0) {
        initAccountTbl.rows = [
            ['Balance', 'Available margin', initAccount.Balance],
            ['FrozenBalance', 'Frozen funds', initAccount.FrozenBalance]
        ]
    }

    var nowAcccount = initAccount
    var nowAcccountTbl = initAccountTbl

    var symbols = Symbols.replace(/\s+/g, "").split(',')
    var pollers = []
    var prePosUpdate = 0
    var suffix = ""
    var needUpdate = false
    var holdProfit = 0

    function updateAccount(acc) {
        nowAcccount = acc
        nowAcccountTbl = $.AccountToTable(exchange.GetRawJSON(), "Current funds")
        if (nowAcccountTbl.rows.length == 0) {
            nowAcccountTbl.rows = [
                ['Balance', 'Available margin', nowAcccount.Balance],
                ['FrozenBalance', 'Frozen funds', nowAcccount.FrozenBalance]
            ]
        }
    }

    var q = $.NewTaskQueue(function(task, ret) {
        needUpdate = true
        Log(task.desc, ret ? "success" : "fail")
        var account = task.e.GetAccount()
        if (account) {
            updateAccount(account)
        }
    })

    _.each(symbols, function(symbol) {
        var pair = symbol.split(':')
        pollers.push(Aberration(q, exchange, pair[0], NPeriod, Ks, Kx, (pair.length == 1 ? AmountOP : parseInt(pair[1]))))
    })

    if (positions.length > 0 && AutoRestore) {
        _.each(pollers, function(poll) {
            poll.restore(positions)
        })
    }
    var isFirst = true
    while (true) {
        var cmd = GetCommand()
        if (cmd) {
            var js = cmd.split(':', 2)[1]
            Log("Execution debug code:", js)
            try {
                eval(js)
            } catch (e) {
                Log("Exception", e)
            }
        }
        tblRuntime.rows = []
        tblMarket.rows = []
        var marketAlive = false
        _.each(pollers, function(poll) {
            if (poll.poll()) {
                marketAlive = true
            }
            tblRuntime.rows.push(poll.getStatus())
            tblMarket.rows.push(poll.getMarket())
        })
        q.poll()
        Sleep(LoopInterval * 1000)
        if ((!exchange.IO("status")) || (!marketAlive)) {
            if (isFirst) {
                LogStatus("Waiting for the market open...", _D())
            }
            continue
        }
        isFirst = false
        var now = new Date().getTime()
        if (marketAlive && (now - prePosUpdate > 30000 || needUpdate)) {
            var pos = exchange.GetPosition()
            if (pos) {
                holdProfit = 0
                prePosUpdate = now
                tblPosition.rows = []
                for (var i = 0; i < pos.length; i++) {
                    tblPosition.rows.push([pos[i].ContractType, pos[i].MarginLevel, ((pos[i].Type == PD_LONG || pos[i].Type == PD_LONG_YD) ? 'long#ff0000' : 'short#0000ff'),
                     pos[i].Price, pos[i].Amount, _N(pos[i].Profit)])
                    holdProfit += pos[i].Profit
                }
                if (pos.length == 0 && needUpdate) {
                    LogProfit(_N(nowAcccount.Balance - initAccount.Balance, 4), nowAcccount)
                }
            }
            needUpdate = false
            if (RCMode) {
                var account = exchange.GetAccount()
                if (account) {
                    updateAccount(account)
                    var detail = JSON.parse(exchange.GetRawJSON())
                    var netAsset = detail['PositionProfit'] + detail['CurrMargin'] + detail['Available']
                    var risk = detail['CurrMargin'] / (detail['CurrMargin'] + detail['Available'] + detail['PositionProfit'])
                    suffix = ", Initial net worth of the account: " + _N(initNetAsset, 2) + " , risk control minimum net value requirement" + MinNetAsset + " , Current account equity: " + _N(netAsset, 2) + 
                             ", Profit and loss: " + _N(netAsset - initNetAsset, 3) + " yuan, risk: " + ((risk * 100).toFixed(3)) + "% #ff0000"
                    if (netAsset < MinNetAsset) {
                        Log("The risk control module triggers, stops running and closes all positions, the current net value is ", netAsset, ", Require less than the minimum net value:", MinNetAsset)
                        if (RCCoverAll) {
                            Log("Start to close all positions")
                            $.NewPositionManager().CoverAll()
                        }
                        throw "Stop running"
                    }
                }
            }
        }
        LogStatus('`' + JSON.stringify([tblRuntime, tblPosition, tblMarket, initAccountTbl, nowAcccountTbl]) + '`\nLast price update: ' + _D() + 
                    ', Last update of position: ' + _D(prePosUpdate) + '\nCurrent holding position total profit and loss: ' + _N(holdProfit, 3) + suffix)
    }
}