-- Id: 23969
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=31&t=67010

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--|                                            http://fxcodebase.com |
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--+------------------------------------------------------------------+

local amounts_count = 2;
local strategy_version = "6";

local Modules = {};

function Init() --The strategy profile initialization
    strategy:name("Quantum Donchian Channel Strategy v." .. strategy_version)
    strategy:description("")
    strategy:setTag("Version", strategy_version);

    strategy:setTag("NonOptimizableParameters", "Email,SendEmail,SoundFile,RecurrentSound,PlaySound, ShowAlert")

    strategy.parameters:addGroup("Price")
    strategy.parameters:addString("Type", "Price Type", "", "Bid")
    strategy.parameters:addStringAlternative("Type", "Bid", "", "Bid")
    strategy.parameters:addStringAlternative("Type", "Ask", "", "Ask")

    strategy.parameters:addString("TF", "Entry Time frame", "", "m15")
    strategy.parameters:setFlag("TF", core.FLAG_PERIODS)
    strategy.parameters:addString("exit_TF", "Exit Time frame", "", "m30")
    strategy.parameters:setFlag("exit_TF", core.FLAG_PERIODS)

    strategy.parameters:addGroup("Donchian Channel Calculation")
    strategy.parameters:addInteger("N", "Number of periods", "", 20, 2, 10000)

    strategy.parameters:addGroup("Quantum Calculation")
    strategy.parameters:addInteger("Period", "Period", "Period", 300)
    strategy.parameters:addBoolean("ReversalOnly", "Trend reversal only", "", true)

    strategy.parameters:addString("ExitType", "ExitType", "", "Central")
    strategy.parameters:addStringAlternative("ExitType", "Central", "", "Central")
    strategy.parameters:addStringAlternative("ExitType", "Top/Bottom", "", "TopBottom")

    strategy.parameters:addDouble("distance_trades", "Distance between trades, pips", "", 10)

    CreateTradingParameters()
end

function CreateTradingParameters()
    strategy.parameters:addGroup("Execution Parameters")

    strategy.parameters:addBoolean("AllowTrade", "Allow strategy to trade", "", true)
    strategy.parameters:setFlag("AllowTrade", core.FLAG_ALLOW_TRADE)

    strategy.parameters:addString("AccountType", "Account Type", "", "Automatic")
    strategy.parameters:addStringAlternative("AccountType", "FIFO", "", "FIFO")
    strategy.parameters:addStringAlternative("AccountType", "non FIFO", "", "NON")
    strategy.parameters:addStringAlternative("AccountType", "Automatic", "", "Automatic")

    strategy.parameters:addString("EntryExecutionType", "Entry Execution Type", "", "EndOfTurn")
    strategy.parameters:addStringAlternative("EntryExecutionType", "End of Turn", "", "EndOfTurn")
    strategy.parameters:addStringAlternative("EntryExecutionType", "Live", "", "Live")
    --*********************************************************************************************************
    strategy.parameters:addString("ExitExecutionType", "Exit Execution Type", "", "EndOfTurn")
    strategy.parameters:addStringAlternative("ExitExecutionType", "End of Turn", "", "EndOfTurn")
    strategy.parameters:addStringAlternative("ExitExecutionType", "Live", "", "Live")
    --*********************************************************************************************************

    strategy.parameters:addGroup("Trade Parameters")

    strategy.parameters:addBoolean("CloseOnOpposite", "Close On Opposite", "", true)
    strategy.parameters:addString(
        "CustomID",
        "Custom Identifier",
        "The identifier that can be used to distinguish strategy instances",
        "QDCS"
    )

    strategy.parameters:addBoolean("PositionCap", "Use Position Cap", "", false)

    strategy.parameters:addInteger(
        "MaxNumberOfPositionInAnyDirection",
        "Max Number Of Open Position In Any Direction",
        "",
        2
    )
    strategy.parameters:addInteger("MaxNumberOfPosition", "Max Number Of Position In One Direction", "", 1)

    strategy.parameters:addString(
        "ALLOWEDSIDE",
        "Allowed side",
        "Allowed side for trading or signaling, can be Sell, Buy or Both",
        "Both"
    )
    strategy.parameters:addStringAlternative("ALLOWEDSIDE", "Both", "", "Both")
    strategy.parameters:addStringAlternative("ALLOWEDSIDE", "Buy", "", "Buy")
    strategy.parameters:addStringAlternative("ALLOWEDSIDE", "Sell", "", "Sell")
    strategy.parameters:addBoolean("first_side_only", "First side only", "", false);
    
    strategy.parameters:addString("Direction", "Type of Signal / Trade", "", "direct")
    strategy.parameters:addStringAlternative("Direction", "Direct", "", "direct")
    strategy.parameters:addStringAlternative("Direction", "Reverse", "", "reverse")

    strategy.parameters:addString("Account", "Account to trade on", "", "")
    strategy.parameters:setFlag("Account", core.FLAG_ACCOUNT)
    strategy.parameters:addInteger("Amount", "Initial Trade Amount in Lots", "", 1, 1, 1000000);
    for i = 1, amounts_count do
        strategy.parameters:addInteger("Amount_start_" .. i, "Amount Since Position #", "", 1);
        strategy.parameters:addInteger("Amount_" .. i, "Trade Amount in Lots", "", 1, 1, 1000000);
    end
    strategy.parameters:addBoolean("SetLimit", "Set Limit Orders", "", false)
    strategy.parameters:addInteger("Limit", "Limit Order in pips", "", 30)
    strategy.parameters:addBoolean("SetStop", "Set Stop Orders", "", false)
    strategy.parameters:addInteger("Stop", "Stop Order in pips", "", 30)
    strategy.parameters:addBoolean("TrailingStop", "Trailing stop order", "", false)
    strategy.parameters:addBoolean("exit_net", "Exit on net cross", "", true);

    --*********************************************************************************************************
    strategy.parameters:addBoolean("Exit", "Use Optional Exit", "", true)
    --*********************************************************************************************************
    strategy.parameters:addGroup("Alerts")
    signaler:Init(strategy.parameters);

    strategy.parameters:addGroup("Time Parameters")

    strategy.parameters:addInteger("ToTime", "Convert the date to", "", 6)
    strategy.parameters:addIntegerAlternative("ToTime", "EST", "", 1)
    strategy.parameters:addIntegerAlternative("ToTime", "UTC", "", 2)
    strategy.parameters:addIntegerAlternative("ToTime", "Local", "", 3)
    strategy.parameters:addIntegerAlternative("ToTime", "Server", "", 4)
    strategy.parameters:addIntegerAlternative("ToTime", "Financial", "", 5)
    strategy.parameters:addIntegerAlternative("ToTime", "Display", "", 6)

    strategy.parameters:addString("StartTime", "Start Time for Trading", "", "00:00:00")
    strategy.parameters:addString("StopTime", "Stop Time for Trading", "", "24:00:00")
    --*********************************************************************************************************
    strategy.parameters:addBoolean("ManageExit", "Use Exit  after Stop Time", "", true)
    --*********************************************************************************************************
    strategy.parameters:addBoolean("UseMandatoryClosing", "Use Mandatory Closing", "", false)
    strategy.parameters:addString("ExitTime", "Mandatory Closing  Time", "", "23:59:00")
    strategy.parameters:addInteger("ValidInterval", "Valid interval for operation in second", "", 60)
end

local AccountType
local Source, TickSource, exit_source
local MaxNumberOfPositionInAnyDirection, MaxNumberOfPosition
local ALLOWEDSIDE
local AllowTrade
local Offer
local CanClose
local Account
local Amounts = {};
local SetLimit
local Limit
local SetStop
local Stop
local TrailingStop
local BaseSize
local EntyExecutionType, ExitExecutionType
local CloseOnOpposite
local first
local Direction
local CustomID
local PositionCap
local TF, exit_TF
local OpenTime, CloseTime, ExitTime
local LastEntry, LastExit
local ToTime
local ValidInterval, UseMandatoryClosing
--*********************************************************************************************************
local ManageExit, Exit
--*********************************************************************************************************
--Indicator parameters
local DNC, N, DNC_exit
local Quantum, Period, ReversalOnly
local ExitType
local first_side_only;
local ENTRY_SOURCE_ID = 2;
local EXIT_SOURCE_ID = 3;
local distance_trades, exit_net;
function Prepare(nameOnly)
    for _, module in pairs(Modules) do module:Prepare(nameOnly); end
    CustomID = instance.parameters.CustomID
    name = profile:id() .. ", " .. instance.bid:name() .. ", " .. CustomID
    instance:name(name)

    if nameOnly then
        return
    end

    exit_net = instance.parameters.exit_net;
    first_side_only = instance.parameters.first_side_only;
    ExitType = instance.parameters.ExitType
    AccountType = instance.parameters.AccountType
    EntryExecutionType = instance.parameters.EntryExecutionType
    ExitExecutionType = instance.parameters.ExitExecutionType
    distance_trades = instance.parameters.distance_trades;
    CloseOnOpposite = instance.parameters.CloseOnOpposite
    MaxNumberOfPositionInAnyDirection = instance.parameters.MaxNumberOfPositionInAnyDirection
    MaxNumberOfPosition = instance.parameters.MaxNumberOfPosition
    Direction = instance.parameters.Direction == "direct"
    TF = instance.parameters.TF
    exit_TF = instance.parameters.exit_TF
    ToTime = instance.parameters.ToTime

    if ToTime == 1 then
        ToTime = core.TZ_EST
    elseif ToTime == 2 then
        ToTime = core.TZ_UTC
    elseif ToTime == 3 then
        ToTime = core.TZ_LOCAL
    elseif ToTime == 4 then
        ToTime = core.TZ_SERVER
    elseif ToTime == 5 then
        ToTime = core.TZ_FINANCIAL
    elseif ToTime == 6 then
        ToTime = core.TZ_TS
    end

    PositionCap = instance.parameters.PositionCap
    ValidInterval = instance.parameters.ValidInterval
    UseMandatoryClosing = instance.parameters.UseMandatoryClosing

    LastEntry = nil
    LastExit = nil
    --*********************************************************************************************************
    ManageExit = instance.parameters.ManageExit
    Exit = instance.parameters.Exit
    --*********************************************************************************************************

    --Indicator parameters
    N = instance.parameters.N
    Period = instance.parameters.Period
    ReversalOnly = instance.parameters.ReversalOnly

    assert(TF ~= "t1", "The time frame must not be tick")

    PrepareTrading()

    assert(core.indicators:findIndicator("DNC") ~= nil, "Please, download and install DNC.LUA indicator")
    assert(core.indicators:findIndicator("QUANTUM") ~= nil, "Please, download and install QUANTUM.LUA indicator")

    if
        EntryExecutionType == "Live" or
            --****************************************************************************************************
            ExitExecutionType == "Live"
     then
        --******************************************************************************************************
        TickSource = ExtSubscribe(1, nil, "t1", instance.parameters.Type == "Bid", "close")
    end

    Source = ExtSubscribe(ENTRY_SOURCE_ID, nil, TF, instance.parameters.Type == "Bid", "bar")
    exit_source = ExtSubscribe(EXIT_SOURCE_ID, nil, exit_TF, instance.parameters.Type == "Bid", "bar")
    DNC = core.indicators:create("DNC", Source, N, "yes", "yes", false)
    DNC_exit = core.indicators:create("DNC", exit_source, N, "yes", "yes", false)
    Quantum = core.indicators:create("QUANTUM", Source, Period, ReversalOnly, true)
    first = math.max(DNC.DM:first(), Period)

    ValidInterval = instance.parameters.ValidInterval
    UseMandatoryClosing = instance.parameters.UseMandatoryClosing

    local valid
    OpenTime, valid = ParseTime(instance.parameters.StartTime)
    assert(valid, "Time " .. instance.parameters.StartTime .. " is invalid")
    CloseTime, valid = ParseTime(instance.parameters.StopTime)
    assert(valid, "Time " .. instance.parameters.StopTime .. " is invalid")
    ExitTime, valid = ParseTime(instance.parameters.ExitTime)
    assert(valid, "Time " .. instance.parameters.ExitTime .. " is invalid")

    if UseMandatoryClosing then
        core.host:execute("setTimer", 100, math.max(ValidInterval / 2, 1))
    end
end

function ReleaseInstance()
    for _, module in pairs(Modules) do if module.ReleaseInstance ~= nil then module:ReleaseInstance(); end end
    core.host:execute("killTimer", 100)
end

function ParseTime(time)
    local Pos = string.find(time, ":")
    if Pos == nil then
        return nil, false
    end
    local h = tonumber(string.sub(time, 1, Pos - 1))
    time = string.sub(time, Pos + 1)
    Pos = string.find(time, ":")
    if Pos == nil then
        return nil, false
    end
    local m = tonumber(string.sub(time, 1, Pos - 1))
    local s = tonumber(string.sub(time, Pos + 1))
    return (h / 24.0 + m / 1440.0 + s / 86400.0), ((h >= 0 and h < 24 and m >= 0 and m < 60 and s >= 0 and s < 60) or -- time in ole format
        (h == 24 and m == 0 and s == 0)) -- validity flag
end

function PrepareTrading()
    ALLOWEDSIDE = instance.parameters.ALLOWEDSIDE

    AllowTrade = instance.parameters.AllowTrade
    Account = instance.parameters.Account
    local amount = {};
    amount.Start = 0;
    amount.Value = instance.parameters.Amount;
    Amounts[#Amounts + 1] = amount;
    for i = 1, amounts_count do
        local amount = {};
        amount.Start = instance.parameters:getInteger("Amount_start_" .. i);
        amount.Value = instance.parameters:getInteger("Amount_" .. i);
        Amounts[#Amounts + 1] = amount;
    end
    BaseSize = core.host:execute("getTradingProperty", "baseUnitSize", instance.bid:instrument(), Account)
    Offer = core.host:findTable("offers"):find("Instrument", instance.bid:instrument()).OfferID

    if AccountType == "FIFO" then
        CanClose = false
    elseif AccountType == "NON" then
        CanClose = true
    else
        CanClose = core.host:execute("getTradingProperty", "canCreateMarketClose", instance.bid:instrument(), Account)
    end

    SetLimit = instance.parameters.SetLimit
    Limit = instance.parameters.Limit
    SetStop = instance.parameters.SetStop
    Stop = instance.parameters.Stop
    TrailingStop = instance.parameters.TrailingStop
end

function ExtUpdate(id, source, period) -- The method called every time when a new bid or ask price appears.
    for _, module in pairs(Modules) do if module.BlockTrading ~= nil and module:BlockTrading(id, source, period) then return; end end for _, module in pairs(Modules) do if module.ExtUpdate ~= nil then module:ExtUpdate(id, source, period); end end
    if AllowTrade then
        if not (checkReady("trades")) or not (checkReady("orders")) then
            return
        end
    end

    if period < 0 then
        return
    end

    if EntryExecutionType == "Live" or ExitExecutionType == "Live" then
        if id ~= 1 then
            return
        end
        period = core.findDate(Source, TickSource:date(period), false)
    elseif id == 1 then
        return
    end

    now = core.host:execute("getServerTime")
    now = core.host:execute("convertTime", core.TZ_EST, ToTime, now)
    -- get only time
    now = now - math.floor(now)

    -- update indicators.
    DNC:update(core.UpdateLast)
    DNC_exit:update(core.UpdateLast)
    Quantum:update(core.UpdateLast)

    if not Source.close:hasData(period) or period < first then
        return
    end

    if EntryExecutionType == "Live" and id == 1 or EntryExecutionType ~= "Live" and id == ENTRY_SOURCE_ID then
        EntryFunction(now, period)
    end

    if ExitExecutionType == "Live" and id == 1 or ExitExecutionType ~= "Live" and id == EXIT_SOURCE_ID then
        ExitFunction(now, period)
    end
end

function InRange(now, openTime, closeTime)
    if openTime < closeTime then
        return now >= openTime and now <= closeTime;
    end
    if openTime > closeTime then
        return now > openTime or now < closeTime;
    end

    return now == openTime;
end

function IsExitLong(period)
    if exit_net then
        local bAmount = 0;
        local bPriceSumm = 0;
        trading:FindTrade()
            :WhenCustomID(CustomID)
            :Do(function (trade)
                if trade.BS == "B" then
                    bAmount = bAmount + trade.AmountK
                    bPriceSumm = bPriceSumm + trade.Open * trade.AmountK;
                end
            end);
        local avgBPrice = bPriceSumm / bAmount;
        if core.crossesOver(DNC_exit.DU, avgBPrice, period) then
            return true;
        end
    end
    return (exit_source.close[period] > DNC_exit.DM[period] and ExitType == "Central") or
        (exit_source.close[period] > DNC_exit.DU[period] and ExitType ~= "Central");
end

function IsExitShort(period)
    if exit_net then
        local sAmount = 0;
        local sPriceSumm = 0;
        trading:FindTrade()
            :WhenCustomID(CustomID)
            :Do(function (trade)
                if trade.BS ~= "B" then
                    sAmount = sAmount + trade.AmountK
                    sPriceSumm = sPriceSumm + trade.Open * trade.AmountK;
                end
            end);
        local avgSPrice = sPriceSumm / sAmount;
        if core.crossesUnder(DNC_exit.DN, avgSPrice, period) then
            return true;
        end
    end
    return (exit_source.close[period] < DNC_exit.DM[period] and ExitType == "Central") or
        (exit_source.close[period] < DNC_exit.DN[period] and ExitType ~= "Central");
end

function ExitFunction(now, period)
    if not Exit then
        return
    end

    if not InRange(now, OpenTime, CloseTime) and not ManageExit then
        return
    end

    if (LastExit == Source:serial(period)) then
        return
    end

    if IsExitLong(period) then
        if Direction then
            if haveTrades("B") then
                exitSpecific("B")
                Signal("Close Long")
            end
        else
            if haveTrades("S") then
                exitSpecific("S")
                Signal("Close Short")
            end
        end
        LastExit = exit_source:serial(period)
    end
    if IsExitShort(period) then
        if Direction then
            if haveTrades("S") then
                exitSpecific("S")
                Signal("Close Short")
            end
        else
            if haveTrades("B") then
                exitSpecific("B")
                Signal("Close Long")
            end
        end

        LastExit = exit_source:serial(period)
    end
end

local last_buy_high;
local last_sell_low;
local last_signal_price;
function EntryFunction(now, period)
    if not InRange(now, OpenTime, CloseTime) then
        return false;
    end

    if (LastEntry == Source:serial(period)) then
        return false;
    end

    local last_trade = GetLastTrade();
    -- only buy if we have a fast cross over slow and the price is above the moving averages.
    if ((Source.close[period] < DNC.DM[period] and Quantum.Signal[period] == -1)
        or (haveTrades("B") and Source.close[period] > last_buy_high))
        and (last_trade == nil or (Source.close[period] - last_trade.Open >= distance_trades * Source:pipSize()))
    then
        if Direction then
            BUY()
        else
            SELL()
        end
        last_buy_high = Source.high[period];
        LastEntry = Source:serial(period)
        return true;
    elseif ((Source.close[period] > DNC.DM[period] and Quantum.Signal[period] == 1)
        or (haveTrades("S") and Source.close[period] < last_sell_low))
        and (last_trade == nil or (Source.close[period] - last_trade.Open >= distance_trades * Source:pipSize()))
    then
        if Direction then
            SELL()
        else
            BUY()
        end
        last_sell_low = Source.low[period];
        LastEntry = Source:serial(period)
        return true;
    end
    return false;
end

function ExtAsyncOperationFinished(cookie, success, message)
    for _, module in pairs(Modules) do if module.AsyncOperationFinished ~= nil then module:AsyncOperationFinished(cookie, success, message, message1, message2); end end
    if cookie == 100 then
        -- timer
        if UseMandatoryClosing and AllowTrade then
            now = core.host:execute("getServerTime")
            now = core.host:execute("convertTime", core.TZ_EST, ToTime, now)
            -- get only time
            now = now - math.floor(now)

            -- check whether the time is in the exit time period
            if now >= ExitTime and now < ExitTime + (ValidInterval / 86400.0) then
                if not checkReady("trades") then
                    return
                end

                if haveTrades("B") then
                    exitSpecific("B")
                    Signal("Close Long")
                end

                if haveTrades("S") then
                    exitSpecific("S")
                    Signal("Close Short")
                end
            end
        end
    elseif cookie == 200 and not success then
        terminal:alertMessage(
            instance.bid:instrument(),
            instance.bid[instance.bid:size() - 1],
            "Open order failed" .. message,
            instance.bid:date(instance.bid:size() - 1)
        )
    elseif cookie == 201 and not success then
        terminal:alertMessage(
            instance.bid:instrument(),
            instance.bid[instance.bid:size() - 1],
            "Close order failed" .. message,
            instance.bid:date(instance.bid:size() - 1)
        )
    end
end

--===========================================================================--
--                    TRADING UTILITY FUNCTIONS                              --
--============================================================================--
local last_side;
function BUY()
    if AllowTrade then
        --if CanClose and CloseOnOpposite and  haveTrades("S") then
        if (CloseOnOpposite or Hedge) and haveTrades("S") then
            -- close on opposite signal
            exitSpecific("S")
            Signal("Close Short")
        end

        if ALLOWEDSIDE == "Sell" or (first_side_only and last_side == "S") then
            -- we are not allowed buys.
            return
        end

        enter("B", 0)
        last_side = "B";
    else
        Signal("Buy Signal")
    end
end

function HEDGELONG()
    if ALLOWEDSIDE == "Buy" and haveTrades("B") then
        -- we are not allowed sells.
        return
    end

    if not haveTrades("B") then
        return
    end

    if AllowTrade then
        local bCount = tradesCount("B")

        if bCount > 0 then
            exitSpecific("B")
            Signal("Hedge Long")
            enter("S", bCount)
        end
    else
        Signal("Hedge Long")
    end
end
function HEDGESHORT()
    if ALLOWEDSIDE == "Sell" and haveTrades("S") then
        -- we are not allowed buys.
        return
    end

    if not haveTrades("S") then
        return
    end

    if AllowTrade then
        local sCount = tradesCount("S")

        if sCount > 0 then
            exitSpecific("S")
            Signal("Hedge Short")
            enter("B", sCount)
        end
    else
        Signal("Hedge Short")
    end
end

function SELL()
    if AllowTrade then
        --if CanClose and CloseOnOpposite and  haveTrades("B") then
        if (CloseOnOpposite or Hedge) and haveTrades("B") then
            -- close on opposite signal
            exitSpecific("B")
            Signal("Close Long")
        end

        if ALLOWEDSIDE == "Buy" or (first_side_only and last_side == "B") then
            -- we are not allowed sells.
            return
        end

        enter("S", 0)
        last_side = "S";
    else
        Signal("Sell Signal")
    end
end

function Signal(Label)
    signaler:Signal(Label, instance.bid);
end

function checkReady(table)
    local rc
    if Account == "TESTACC_ID" then
        -- run under debugger/simulator
        rc = true
    else
        rc = core.host:execute("isTableFilled", table)
    end

    return rc
end

function tradesCount(BuySell)
    local enum, row
    local count = 0
    enum = core.host:findTable("trades"):enumerator()
    row = enum:next()
    while row ~= nil do
        if
            row.AccountID == Account and row.OfferID == Offer and row.QTXT == CustomID and
                (row.BS == BuySell or BuySell == nil)
         then
            count = count + 1
        end

        row = enum:next()
    end

    return count
end

function GetLastTrade()
    local enum, row
    enum = core.host:findTable("trades"):enumerator()
    local trade;
    row = enum:next()
    while (row ~= nil) do
        if row.AccountID == Account and row.OfferID == Offer and row.QTXT == CustomID then
            if trade == nil or trade.Time < row.Time then
                trade = row;
            end
        end

        row = enum:next()
    end
    return trade;
end

function haveTrades(BuySell)
    local enum, row
    local found = false
    enum = core.host:findTable("trades"):enumerator()
    row = enum:next()
    while (row ~= nil) do
        if
            row.AccountID == Account and row.OfferID == Offer and row.QTXT == CustomID and
                (row.BS == BuySell or BuySell == nil)
         then
            found = true
            break
        end

        row = enum:next()
    end

    return found
end

-- enter into the specified direction
function enter(BuySell, hCount)
    -- do not enter if position in the specified direction already exists
    if
        (tradesCount(BuySell) >= MaxNumberOfPosition or (tradesCount(nil) >= MaxNumberOfPositionInAnyDirection)) and
            PositionCap
     then
        return true
    end

    -- send the alert after the checks to see if we can trade.
    if (BuySell == "S") then
        Signal("Sell Signal")
    else
        Signal("Buy Signal")
    end

    return MarketOrder(BuySell, hCount)
end

function GetAmount(BuySell)
    local count = tradesCount(BuySell) + 1;
    local amount = 0;
    for _, item in ipairs(Amounts) do
        if count >= item.Start then
            amount = item.Value;
        end
    end
    return amount;
end

-- enter into the specified direction
function MarketOrder(BuySell, hCount)
    local valuemap, success, msg
    valuemap = core.valuemap()

    valuemap.Command = "CreateOrder"
    valuemap.OrderType = "OM"
    valuemap.OfferID = Offer
    valuemap.AcctID = Account
    
    valuemap.Quantity = GetAmount(BuySell) * BaseSize
    valuemap.BuySell = BuySell
    valuemap.CustomID = CustomID

    -- add stop/limit
    valuemap.PegTypeStop = "O"
    if SetStop then
        if BuySell == "B" then
            valuemap.PegPriceOffsetPipsStop = -Stop
        else
            valuemap.PegPriceOffsetPipsStop = Stop
        end
    end
    if TrailingStop then
        valuemap.TrailStepStop = 1
    end

    valuemap.PegTypeLimit = "O"
    if SetLimit then
        if BuySell == "B" then
            valuemap.PegPriceOffsetPipsLimit = Limit
        else
            valuemap.PegPriceOffsetPipsLimit = -Limit
        end
    end

    if (not CanClose) then
        valuemap.EntryLimitStop = "Y"
    end

    success, msg = terminal:execute(200, valuemap)

    if not (success) then
        terminal:alertMessage(
            instance.bid:instrument(),
            instance.bid[instance.bid:size() - 1],
            "Open order failed" .. msg,
            instance.bid:date(instance.bid:size() - 1)
        )
        return false
    end

    return true
end

function exitSpecific(BuySell)
    if not AllowTrade then
        return
    end

    --side
    -- closes all positions of the specified direction (B for buy, S for sell)

    local enum, row, valuemap

    enum = core.host:findTable("trades"):enumerator()
    while true do
        row = enum:next()
        if row == nil then
            break
        end
        if row.AccountID == Account and row.OfferID == Offer and row.BS == BuySell and row.QTXT == CustomID then
            -- if trade has to be closed

            if CanClose then
                -- non-FIFO account, create a close market order
                valuemap = core.valuemap()
                valuemap.OrderType = "CM"
                valuemap.OfferID = Offer
                valuemap.AcctID = Account
                valuemap.Quantity = row.Lot
                valuemap.TradeID = row.TradeID
                valuemap.CustomID = CustomID
                if row.BS == "B" then
                    valuemap.BuySell = "S"
                else
                    valuemap.BuySell = "B"
                end
                success, msg = terminal:execute(201, valuemap)
                if not (success) then
                    terminal:alertMessage(
                        instance.bid:instrument(),
                        instance.bid[instance.bid:size() - 1],
                        "Close order failed" .. msg,
                        instance.bid:date(instance.bid:size() - 1)
                    )
                    return false
                end
            else
                -- FIFO account, create an opposite market order
                valuemap = core.valuemap()
                valuemap.OrderType = "OM"
                valuemap.OfferID = Offer
                valuemap.AcctID = Account
                --valuemap.Quantity = Amount*BaseSize;
                valuemap.Quantity = row.Lot
                valuemap.CustomID = CustomID
                if row.BS == "B" then
                    valuemap.BuySell = "S"
                else
                    valuemap.BuySell = "B"
                end
                success, msg = terminal:execute(201, valuemap)
                if not (success) then
                    terminal:alertMessage(
                        instance.bid:instrument(),
                        instance.bid[instance.bid:size() - 1],
                        "Close order failed" .. msg,
                        instance.bid:date(instance.bid:size() - 1)
                    )
                    return false
                end
            end
        end
    end
end

dofile(core.app_path() .. "\\strategies\\standard\\include\\helper.lua")

signaler = {};
signaler.Name = "Signaler";
signaler.Debug = false;
signaler.Version = "1.4";

signaler._show_alert = nil;
signaler._sound_file = nil;
signaler._recurrent_sound = nil;
signaler._email = nil;
signaler._ids_start = nil;
signaler._advanced_alert_timer = nil;
signaler._tz = nil;
signaler._alerts = {};

function signaler:trace(str) if not self.Debug then return; end core.host:trace(self.Name .. ": " .. str); end
function signaler:OnNewModule(module) end
function signaler:RegisterModule(modules) for _, module in pairs(modules) do self:OnNewModule(module); module:OnNewModule(self); end modules[#modules + 1] = self; self._ids_start = (#modules) * 100; end

function signaler:ToJSON(item)
    local json = {};
    function json:AddStr(name, value)
        local separator = "";
        if self.str ~= nil then
            separator = ",";
        else
            self.str = "";
        end
        self.str = self.str .. string.format("%s\"%s\":\"%s\"", separator, tostring(name), tostring(value));
    end
    function json:AddNumber(name, value)
        local separator = "";
        if self.str ~= nil then
            separator = ",";
        else
            self.str = "";
        end
        self.str = self.str .. string.format("%s\"%s\":%f", separator, tostring(name), value or 0);
    end
    function json:AddBool(name, value)
        local separator = "";
        if self.str ~= nil then
            separator = ",";
        else
            self.str = "";
        end
        self.str = self.str .. string.format("%s\"%s\":%s", separator, tostring(name), value and "true" or "false");
    end
    function json:ToString()
        return "{" .. (self.str or "") .. "}";
    end
    
    local first = true;
    for idx,t in pairs(item) do
        local stype = type(t)
        if stype == "number" then
            json:AddNumber(idx, t);
        elseif stype == "string" then
            json:AddStr(idx, t);
        elseif stype == "boolean" then
            json:AddBool(idx, t);
        elseif stype == "function" or stype == "table" then
            --do nothing
        else
            core.host:trace(tostring(idx) .. " " .. tostring(stype));
        end
    end
    return json:ToString();
end

function signaler:ArrayToJSON(arr)
    local str = "[";
    for i, t in ipairs(self._alerts) do
        local json = self:ToJSON(t);
        if str == "[" then
            str = str .. json;
        else
            str = str .. "," .. json;
        end
    end
    return str .. "]";
end

function signaler:AsyncOperationFinished(cookie, success, message, message1, message2)
    if cookie == self._advanced_alert_timer and #self._alerts > 0 and (self.last_req == nil or not self.last_req:loading()) then
        if self._advanced_alert_key == nil then
            return;
        end

        local data = self:ArrayToJSON(self._alerts);
        self._alerts = {};
        
        self.last_req = http_lua.createRequest();
        local query = string.format('{"Key":"%s","StrategyName":"%s","Platform":"FXTS2","Notifications":%s}',
            self._advanced_alert_key, string.gsub(self.StrategyName or "", '"', '\\"'), data);
        self.last_req:setRequestHeader("Content-Type", "application/json");
        self.last_req:setRequestHeader("Content-Length", tostring(string.len(query)));

        self.last_req:start("http://profitrobots.com/api/v1/notification", "POST", query);
    end
end

function signaler:FormatEmail(source, period, message)
    --format email subject
    local subject = message .. "(" .. source:instrument() .. ")";
    --format email text
    local delim = "\013\010";
    local signalDescr = "Signal: " .. (self.StrategyName or "");
    local symbolDescr = "Symbol: " .. source:instrument();
    local messageDescr = "Message: " .. message;
    local ttime = core.dateToTable(core.host:execute("convertTime", core.TZ_EST, self._ToTime, source:date(period)));
    local dateDescr = string.format("Time:  %02i/%02i %02i:%02i", ttime.month, ttime.day, ttime.hour, ttime.min);
    local priceDescr = "Price: " .. source[period];
    local text = "You have received this message because the following signal alert was received:"
        .. delim .. signalDescr .. delim .. symbolDescr .. delim .. messageDescr .. delim .. dateDescr .. delim .. priceDescr;
    return subject, text;
end

function signaler:Signal(label, source)
    if source == nil then
        source = instance.bid;
        if instance.bid == nil then
            local pane = core.host.Window.CurrentPane;
            source = pane.Data:getStream(0);
        else
            source = instance.bid;
        end
    end
    if self._show_alert then
        terminal:alertMessage(source:instrument(), source[NOW], label, source:date(NOW));
    end

    if self._sound_file ~= nil then
        terminal:alertSound(self._sound_file, self._recurrent_sound);
    end

    if self._email ~= nil then
        terminal:alertEmail(self._email, profile:id().. " : " .. label, self:FormatEmail(source, NOW, label));
    end

    if self._advanced_alert_key ~= nil then
        self:AlertTelegram(label, source:instrument(), source:barSize());
    end

    if self._signaler_debug_alert then
        core.host:trace(label);
    end

    if self._show_popup == true then
        local subject, text = self:FormatEmail(source, NOW, label);
        core.host:execute("prompt", self._ids_start + 2, subject, text);
    end
end

function signaler:AlertTelegram(message, instrument, timeframe)
    if core.host.Trading:getTradingProperty("isSimulation") then
        return;
    end
    local alert = {};
    alert.Text = message or "";
    alert.Instrument = instrument or "";
    alert.TimeFrame = timeframe or "";
    self._alerts[#self._alerts + 1] = alert;
end

function signaler:Init(parameters)
    parameters:addInteger("signaler_ToTime", "Convert the date to", "", 6)
    parameters:addIntegerAlternative("signaler_ToTime", "EST", "", 1)
    parameters:addIntegerAlternative("signaler_ToTime", "UTC", "", 2)
    parameters:addIntegerAlternative("signaler_ToTime", "Local", "", 3)
    parameters:addIntegerAlternative("signaler_ToTime", "Server", "", 4)
    parameters:addIntegerAlternative("signaler_ToTime", "Financial", "", 5)
    parameters:addIntegerAlternative("signaler_ToTime", "Display", "", 6)
    
    parameters:addBoolean("signaler_show_alert", "Show Alert", "", true);
    parameters:addBoolean("signaler_play_sound", "Play Sound", "", false);
    parameters:addFile("signaler_sound_file", "Sound File", "", "");
    parameters:setFlag("signaler_sound_file", core.FLAG_SOUND);
    parameters:addBoolean("signaler_recurrent_sound", "Recurrent Sound", "", true);
    parameters:addBoolean("signaler_send_email", "Send Email", "", false);
    parameters:addString("signaler_email", "Email", "", "");
    parameters:setFlag("signaler_email", core.FLAG_EMAIL);
    if indicator ~= nil and strategy == nil then
        parameters:addBoolean("signaler_show_popup", "Show Popup", "", false);
    end
    parameters:addBoolean("signaler_debug_alert", "Print into log", "", false);
    parameters:addBoolean("use_advanced_alert", "Send Advanced Alert", "Telegram message or Channel post", false);
    parameters:addString("advanced_alert_key", "Advanced Alert Key", "You can get it via @profit_robots_bot Telegram bot", "");
end

function signaler:Prepare(name_only)
    self._ToTime = instance.parameters.signaler_ToTime
    if self._ToTime == 1 then
        self._ToTime = core.TZ_EST
    elseif self._ToTime == 2 then
        self._ToTime = core.TZ_UTC
    elseif self._ToTime == 3 then
        self._ToTime = core.TZ_LOCAL
    elseif self._ToTime == 4 then
        self._ToTime = core.TZ_SERVER
    elseif self._ToTime == 5 then
        self._ToTime = core.TZ_FINANCIAL
    elseif self._ToTime == 6 then
        self._ToTime = core.TZ_TS
    end

    if instance.parameters.signaler_play_sound then
        self._sound_file = instance.parameters.signaler_sound_file;
        assert(self._sound_file ~= "", "Sound file must be chosen");
    end
    self._show_alert = instance.parameters.signaler_show_alert;
    self._recurrent_sound = instance.parameters.signaler_recurrent_sound;
    self._show_popup = instance.parameters.signaler_show_popup;
    self._signaler_debug_alert = instance.parameters.signaler_debug_alert;
    if instance.parameters.signaler_send_email then
        self._email = instance.parameters.signaler_email;
        assert(self._email ~= "", "E-mail address must be specified");
    end
    --do what you usually do in prepare
    if name_only then
        return;
    end

    if instance.parameters.advanced_alert_key ~= "" and instance.parameters.use_advanced_alert then
        self._advanced_alert_key = instance.parameters.advanced_alert_key;
        require("http_lua");
        self._advanced_alert_timer = self._ids_start + 1;
        core.host:execute("setTimer", self._advanced_alert_timer, 1);
    end
end
signaler:RegisterModule(Modules);

trading = {};
trading.Name = "Trading";
trading.Version = "4.29";
trading.Debug = false;
trading.AddAmountParameter = true;
trading.AddStopParameter = true;
trading.AddLimitParameter = true;
trading.AddBreakevenParameters = true;
trading._ids_start = nil;
trading._signaler = nil;
trading._account = nil;
trading._all_modules = {};
trading._request_id = {};
trading._waiting_requests = {};
trading._used_stop_orders = {};
trading._used_limit_orders = {};
function trading:trace(str) if not self.Debug then return; end core.host:trace(self.Name .. ": " .. str); end
function trading:RegisterModule(modules) for _, module in pairs(modules) do self:OnNewModule(module); module:OnNewModule(self); end modules[#modules + 1] = self; self._ids_start = (#modules) * 100; end

function trading:AddPositionParameters(parameters, id, section_id)
    if self.AddAmountParameter then
        parameters:addDouble("amount" .. id, "Trade Amount", "", 1);
        parameters:addString("amount_type" .. id, "Amount Type", "", "lots");
        parameters:addStringAlternative("amount_type" .. id, "In Lots", "", "lots");
        parameters:addStringAlternative("amount_type" .. id, "% of Equity", "", "equity");
        parameters:addStringAlternative("amount_type" .. id, "Risk % of Equity", "", "risk_equity");
    end
    if CreateStopParameters == nil or not CreateStopParameters(parameters, id) then
        parameters:addGroup("  Stop parameters " .. section_id);
        parameters:addString("stop_type" .. id, "Stop Order", "", "no");
        parameters:addStringAlternative("stop_type" .. id, "No stop", "", "no");
        parameters:addStringAlternative("stop_type" .. id, "In Pips", "", "pips");
        if not DISABLE_ATR_STOP_LIMIT then
            parameters:addStringAlternative("stop_type" .. id, "ATR", "", "atr");
        end
        parameters:addStringAlternative("stop_type" .. id, "High/low", "", "highlow");
        parameters:addDouble("stop" .. id, "Stop Value", "In pips or ATR period", 30);
        if not DISABLE_ATR_STOP_LIMIT then
            parameters:addDouble("atr_stop_mult" .. id, "ATR Stop Multiplicator", "", 2.0);
        end
        parameters:addBoolean("use_trailing" .. id, "Trailing stop order", "", false);
        parameters:addInteger("trailing" .. id, "Trailing in pips", "Use 1 for dynamic and 10 or greater for the fixed trailing", 1);
    end
    if CreateLimitParameters ~= nil then
        CreateLimitParameters(parameters, id);
    else
        parameters:addGroup("  Limit parameters " .. section_id);
        parameters:addString("limit_type" .. id, "Limit Order", "", "no");
        parameters:addStringAlternative("limit_type" .. id, "No limit", "", "no");
        parameters:addStringAlternative("limit_type" .. id, "In Pips", "", "pips");
        if not DISABLE_ATR_STOP_LIMIT then
            parameters:addStringAlternative("limit_type" .. id, "ATR", "", "atr");
        end
        parameters:addStringAlternative("limit_type" .. id, "Multiplicator of stop", "", "stop");
        parameters:addStringAlternative("limit_type" .. id, "High/low", "", "highlow");
        parameters:addDouble("limit" .. id, "Limit Value", "In pips or ATR period", 30);
        if not DISABLE_ATR_STOP_LIMIT then
            parameters:addDouble("atr_limit_mult" .. id, "ATR Limit Multiplicator", "", 2.0);
        end
        if not DISABLE_LIMIT_TRAILING then
            parameters:addString("TRAILING_LIMIT_TYPE" .. id, "Trailing Limit", "", "Off");
            parameters:addStringAlternative("TRAILING_LIMIT_TYPE" .. id, "Off", "", "Off");
            parameters:addStringAlternative("TRAILING_LIMIT_TYPE" .. id, "Favorable", "moves limit up for long/buy positions, vice versa for short/sell", "Favorable");
            parameters:addStringAlternative("TRAILING_LIMIT_TYPE" .. id, "Unfavorable", "moves limit down for long/buy positions, vice versa for short/sell", "Unfavorable");
            parameters:addDouble("TRAILING_LIMIT_TRIGGER" .. id, "Trailing Limit Trigger in Pips", "", 0);
            parameters:addDouble("TRAILING_LIMIT_STEP" .. id, "Trailing Limit Step in Pips", "", 10);
        end
    end
    if self.AddBreakevenParameters then
        parameters:addGroup("  Breakeven parameters " .. section_id);
        parameters:addBoolean("use_breakeven" .. id, "Use Breakeven", "", false);
        parameters:addDouble("breakeven_when" .. id, "Breakeven Activation Value, in pips", "", 10);
        parameters:addDouble("breakeven_to" .. id, "Breakeven To, in pips", "", 0);
        parameters:addString("breakeven_trailing" .. id, "Trailing after breakeven", "", "default");
        parameters:addStringAlternative("breakeven_trailing" .. id, "Do not change", "", "default");
        parameters:addStringAlternative("breakeven_trailing" .. id, "Set trailing", "", "set");
        parameters:addBoolean("breakeven_close" .. id, "Partial close on breakeven", "", false);
        parameters:addDouble("breakeven_close_amount" .. id, "Partial close amount, %", "", 50);
    end
end

function trading:Init(parameters, count)
    parameters:addBoolean("allow_trade", "Allow strategy to trade", "", true);
    parameters:setFlag("allow_trade", core.FLAG_ALLOW_TRADE);
    parameters:addString("account", "Account to trade on", "", "");
    parameters:setFlag("account", core.FLAG_ACCOUNT);
    parameters:addString("allow_side", "Allow side", "", "both")
    parameters:addStringAlternative("allow_side", "Both", "", "both")
    parameters:addStringAlternative("allow_side", "Long/buy only", "", "buy")
    parameters:addStringAlternative("allow_side", "Short/sell only", "", "sell")
    parameters:addBoolean("close_on_opposite", "Close on Opposite", "", true);
    if ENFORCE_POSITION_CAP ~= true then
        parameters:addBoolean("position_cap", "Position Cap", "", false);
        parameters:addInteger("no_of_positions", "Max # of open positions", "", 1);
        parameters:addInteger("no_of_buy_position", "Max # of buy positions", "", 1);
        parameters:addInteger("no_of_sell_position", "Max # of sell positions", "", 1);
    end
    
    if count == nil or count == 1 then
        parameters:addGroup("Position");
        self:AddPositionParameters(parameters, "", "");
    else
        for i = 1, count do
            parameters:addGroup("Position #" .. i);
            parameters:addBoolean("use_position_" .. i, "Open position #" .. i, "", i == 1);
            self:AddPositionParameters(parameters, "_" .. i, "#" .. i);
        end
    end
end

function trading:Prepare(name_only)
    if name_only then return; end
end

function trading:ExtUpdate(id, source, period)
end

function trading:OnNewModule(module)
    if module.Name == "Signaler" then self._signaler = module; end
    self._all_modules[#self._all_modules + 1] = module;
end

function trading:AsyncOperationFinished(cookie, success, message, message1, message2)
    local res = self._waiting_requests[cookie];
    if res ~= nil then
        res.Finished = true;
        res.Success = success;
        if not success then
            res.Error = message;
            if self._signaler ~= nil then
                self._signaler:Signal(res.Error);
            else
                self:trace(res.Error);
            end
        elseif res.OnSuccess ~= nil then
            res:OnSuccess();
        end
        self._waiting_requests[cookie] = nil;
    elseif cookie == self._order_update_id then
        for _, order in ipairs(self._monitored_orders) do
            if order.RequestID == message2 then
                order.FixStatus = message1;
            end
        end
    elseif cookie == self._ids_start + 2 then
        if not success then
            if self._signaler ~= nil then
                self._signaler:Signal("Close order failed: " .. message);
            else
                self:trace("Close order failed: " .. message);
            end
        end
    end
end

function trading:getOppositeSide(side) if side == "B" then return "S"; end return "B"; end

function trading:getId()
    for id = self._ids_start, self._ids_start + 100 do
        if self._waiting_requests[id] == nil then return id; end
    end
    return self._ids_start;
end

function trading:CreateStopOrder(trade, stop_rate, trailing)
    local valuemap = core.valuemap();
    valuemap.Command = "CreateOrder";
    valuemap.OfferID = trade.OfferID;
    valuemap.Rate = stop_rate;
    if trade.BS == "B" then
        valuemap.BuySell = "S";
    else
        valuemap.BuySell = "B";
    end

    local can_close = core.host:execute("getTradingProperty", "canCreateMarketClose", trade.Instrument, trade.AccountID);
    if can_close then
        valuemap.OrderType = "S";
        valuemap.AcctID  = trade.AccountID;
        valuemap.TradeID = trade.TradeID;
        valuemap.Quantity = trade.Lot;
        valuemap.TrailUpdatePips = trailing;
    else
        valuemap.OrderType = "SE"
        valuemap.AcctID  = trade.AccountID;
        valuemap.NetQtyFlag = "Y"
    end

    local id = self:getId();
    local success, msg = terminal:execute(id, valuemap);
    if not(success) then
        local message = "Failed create stop " .. msg;
        self:trace(message);
        if self._signaler ~= nil then
            self._signaler:Signal(message);
        end
        local res = {};
        res.Finished = true;
        res.Success = false;
        res.Error = message;
        return res;
    end
    local res = {};
    res.Finished = false;
    res.RequestID = msg;
    self._waiting_requests[id] = res;
    self._request_id[trade.TradeID] = msg;
    return res;
end

function trading:CreateLimitOrder(trade, limit_rate)
    local valuemap = core.valuemap();
    valuemap.Command = "CreateOrder";
    valuemap.OfferID = trade.OfferID;
    valuemap.Rate = limit_rate;
    if trade.BS == "B" then
        valuemap.BuySell = "S";
    else
        valuemap.BuySell = "B";
    end
    local can_close = core.host:execute("getTradingProperty", "canCreateMarketClose", trade.Instrument, trade.AccountID);
    if can_close then
        valuemap.OrderType = "L";
        valuemap.AcctID  = trade.AccountID;
        valuemap.TradeID = trade.TradeID;
        valuemap.Quantity = trade.Lot;
    else
        valuemap.OrderType = "LE"
        valuemap.AcctID  = trade.AccountID;
        valuemap.NetQtyFlag = "Y"
    end
    local success, msg = terminal:execute(200, valuemap);
    if not(success) then
        terminal:alertMessage(trade.Instrument, limit_rate, "Failed create limit " .. msg, core.now());
    else
        self._request_id[trade.TradeID] = msg;
    end
end

function trading:ChangeOrder(order, rate, trailing)
    local min_change = core.host:findTable("offers"):find("Instrument", order.Instrument).PointSize;
    if math.abs(rate - order.Rate) > min_change then
        self:trace(string.format("Changing an order to %s", tostring(rate)));
        -- stop exists
        local valuemap = core.valuemap();
        valuemap.Command = "EditOrder";
        valuemap.AcctID  = order.AccountID;
        valuemap.OrderID = order.OrderID;
        valuemap.TrailUpdatePips = trailing;
        valuemap.Rate = rate;
        local id = self:getId();
        local success, msg = terminal:execute(id, valuemap);
        if not(success) then
            local message = "Failed change order " .. msg;
            self:trace(message);
            if self._signaler ~= nil then
                self._signaler:Signal(message);
            end
            local res = {};
            res.Finished = true;
            res.Success = false;
            res.Error = message;
            return res;
        end
        local res = {};
        res.Finished = false;
        res.RequestID = msg;
        self._waiting_requests[id] = res;
        return res;
    end
    local res = {};
    res.Finished = true;
    res.Success = true;
    return res;
end

function trading:IsLimitOrder(order)
    local order_type = order.Type;
    if order_type == "L" or order_type == "LT" or order_type == "LTE" then
        return true;
    end
    return order.ContingencyType == 3 and order_type == "LE";
end

function trading:IsStopOrder(order) 
    local order_type = order.Type;
    if order_type == "S" or order_type == "ST" or order_type == "STE" then
        return true;
    end
    return order.ContingencyType == 3 and order_type == "SE";
end

function trading:IsLimitOrderType(order_type) return order_type == "L" or order_type == "LE" or order_type == "LT" or order_type == "LTE"; end

function trading:IsStopOrderType(order_type) return order_type == "S" or order_type == "SE" or order_type == "ST" or order_type == "STE"; end

function trading:FindLimitOrder(trade)
    local can_close = core.host:execute("getTradingProperty", "canCreateMarketClose", trade.Instrument, trade.AccountID);
    if can_close then
        local order_id;
        if trade.LimitOrderID ~= nil and trade.LimitOrderID ~= "" then
            order_id = trade.LimitOrderID;
            self:trace("Using limit order id from the trade");
        elseif self._request_id[trade.TradeID] ~= nil then
            self:trace("Searching limit order by request id: " .. tostring(self._request_id[trade.TradeID]));
            local order = core.host:findTable("orders"):find("RequestID", self._request_id[trade.TradeID]);
            if order ~= nil then
                order_id = order.OrderID;
                self._request_id[trade.TradeID] = nil;
            end
        end
        -- Check that order is stil exist
        if order_id ~= nil then return core.host:findTable("orders"):find("OrderID", order_id); end
    else
        local enum = core.host:findTable("orders"):enumerator();
        local row = enum:next();
        while (row ~= nil) do
            if self:IsLimitOrder(row) and self._used_limit_orders[row.OrderID] ~= true then
                self._used_limit_orders[row.OrderID] = true;
                return row;
            end
            row = enum:next();
        end
    end
    return nil;
end

function trading:FindStopOrder(trade)
    local can_close = core.host:execute("getTradingProperty", "canCreateMarketClose", trade.Instrument, trade.AccountID);
    if can_close then
        local order_id;
        if trade.StopOrderID ~= nil and trade.StopOrderID ~= "" then
            order_id = trade.StopOrderID;
            self:trace("Using stop order id from the trade");
        elseif self._request_id[trade.TradeID] ~= nil then
            self:trace("Searching stop order by request id: " .. tostring(self._request_id[trade.TradeID]));
            local order = core.host:findTable("orders"):find("RequestID", self._request_id[trade.TradeID]);
            if order ~= nil then
                order_id = order.OrderID;
                self._request_id[trade.TradeID] = nil;
            end
        end
        -- Check that order is stil exist
        if order_id ~= nil then return core.host:findTable("orders"):find("OrderID", order_id); end
    else
        local enum = core.host:findTable("orders"):enumerator();
        local row = enum:next();
        while (row ~= nil) do
            if self:IsStopOrder(row) and self._used_stop_orders[row.OrderID] ~= true then
                self._used_stop_orders[row.OrderID] = true;
                return row;
            end
            row = enum:next();
        end
    end
    return nil;
end

function trading:MoveStop(trade, stop_rate, trailing)
    local order = self:FindStopOrder(trade);
    if order == nil then
        if trailing == 0 then
            trailing = nil;
        end
        return self:CreateStopOrder(trade, stop_rate, trailing);
    else
        if trailing == 0 then
            if order.TrlMinMove ~= 0 then
                trailing = order.TrlMinMove
            else
                trailing = nil;
            end
        end
        return self:ChangeOrder(order, stop_rate, trailing);
    end
end

function trading:MoveLimit(trade, limit_rate)
    self:trace("Searching for a limit");
    local order = self:FindLimitOrder(trade);
    if order == nil then
        self:trace("Limit order not found, creating a new one");
        return self:CreateLimitOrder(trade, limit_rate);
    else
        return self:ChangeOrder(order, limit_rate);
    end
end

function trading:RemoveStop(trade)
    self:trace("Searching for a stop");
    local order = self:FindStopOrder(trade);
    if order == nil then self:trace("No stop"); return nil; end
    self:trace("Deleting order");
    return self:DeleteOrder(order);
end

function trading:RemoveLimit(trade)
    self:trace("Searching for a limit");
    local order = self:FindLimitOrder(trade);
    if order == nil then self:trace("No limit"); return nil; end
    self:trace("Deleting order");
    return self:DeleteOrder(order);
end

function trading:DeleteOrder(order)
    self:trace(string.format("Deleting order %s", order.OrderID));
    local valuemap = core.valuemap();
    valuemap.Command = "DeleteOrder";
    valuemap.OrderID = order.OrderID;

    local id = self:getId();
    local success, msg = terminal:execute(id, valuemap);
    if not(success) then
        local message = "Delete order failed: " .. msg;
        self:trace(message);
        if self._signaler ~= nil then
            self._signaler:Signal(message);
        end
        local res = {};
        res.Finished = true;
        res.Success = false;
        res.Error = message;
        return res;
    end
    local res = {};
    res.Finished = false;
    res.RequestID = msg;
    self._waiting_requests[id] = res;
    return res;
end

function trading:GetCustomID(qtxt)
    if qtxt == nil then
        return nil;
    end
    local metadata = self:GetMetadata(qtxt);
    if metadata == nil then
        return qtxt;
    end
    return metadata.CustomID;
end

function trading:FindOrder()
    local search = {};
    function search:WhenCustomID(custom_id) self.CustomID = custom_id; return self; end
    function search:WhenSide(bs) self.Side = bs; return self; end
    function search:WhenInstrument(instrument) self.Instrument = instrument; return self; end
    function search:WhenAccountID(account_id) self.AccountID = account_id; return self; end
    function search:WhenRate(rate) self.Rate = rate; return self; end
    function search:WhenOrderType(orderType) self.OrderType = orderType; return self; end
    function search:Do(action)
        local enum = core.host:findTable("orders"):enumerator();
        local row = enum:next();
        local count = 0
        while (row ~= nil) do
            if self:PassFilter(row) then
                if action(row) then
                    count = count + 1;
                end
            end
            row = enum:next();
        end
        return count;
    end
    function search:Summ(action)
        local enum = core.host:findTable("orders"):enumerator();
        local row = enum:next();
        local summ = 0
        while (row ~= nil) do
            if self:PassFilter(row) then
                summ = summ + action(row);
            end
            row = enum:next();
        end
        return summ;
    end
    function search:PassFilter(row)
        return (row.Instrument == self.Instrument or not self.Instrument)
            and (row.BS == self.Side or not self.Side)
            and (row.AccountID == self.AccountID or not self.AccountID)
            and (trading:GetCustomID(row.QTXT) == self.CustomID or not self.CustomID)
            and (row.Rate == self.Rate or not self.Rate)
            and (row.Type == self.OrderType or not self.OrderType);
    end
    function search:All()
        local enum = core.host:findTable("orders"):enumerator();
        local row = enum:next();
        local orders = {};
        while (row ~= nil) do
            if self:PassFilter(row) then orders[#orders + 1] = row; end
            row = enum:next();
        end
        return orders;
    end
    function search:First()
        local enum = core.host:findTable("orders"):enumerator();
        local row = enum:next();
        while (row ~= nil) do
            if self:PassFilter(row) then return row; end
            row = enum:next();
        end
        return nil;
    end
    return search;
end

function trading:FindTrade()
    local search = {};
    function search:WhenCustomID(custom_id) self.CustomID = custom_id; return self; end
    function search:WhenSide(bs) self.Side = bs; return self; end
    function search:WhenInstrument(instrument) self.Instrument = instrument; return self; end
    function search:WhenAccountID(account_id) self.AccountID = account_id; return self; end
    function search:WhenOpen(open) self.Open = open; return self; end
    function search:WhenOpenOrderReqID(open_order_req_id) self.OpenOrderReqID = open_order_req_id; return self; end
    function search:Do(action)
        local enum = core.host:findTable("trades"):enumerator();
        local row = enum:next();
        local count = 0
        while (row ~= nil) do
            if self:PassFilter(row) then
                if action(row) then
                    count = count + 1;
                end
            end
            row = enum:next();
        end
        return count;
    end
    function search:Summ(action)
        local enum = core.host:findTable("trades"):enumerator();
        local row = enum:next();
        local summ = 0
        while (row ~= nil) do
            if self:PassFilter(row) then
                summ = summ + action(row);
            end
            row = enum:next();
        end
        return summ;
    end
    function search:PassFilter(row)
        return (row.Instrument == self.Instrument or not self.Instrument)
            and (row.BS == self.Side or not self.Side)
            and (row.AccountID == self.AccountID or not self.AccountID)
            and (trading:GetCustomID(row.QTXT) == self.CustomID or not self.CustomID)
            and (row.Open == self.Open or not self.Open)
            and (row.OpenOrderReqID == self.OpenOrderReqID or not self.OpenOrderReqID);
    end
    function search:All()
        local enum = core.host:findTable("trades"):enumerator();
        local row = enum:next();
        local trades = {};
        while (row ~= nil) do
            if self:PassFilter(row) then trades[#trades + 1] = row; end
            row = enum:next();
        end
        return trades;
    end
    function search:Any()
        local enum = core.host:findTable("trades"):enumerator();
        local row = enum:next();
        while (row ~= nil) do
            if self:PassFilter(row) then 
                return true;
            end
            row = enum:next();
        end
        return false;
    end
    function search:Count()
        local enum = core.host:findTable("trades"):enumerator();
        local row = enum:next();
        local count = 0;
        while (row ~= nil) do
            if self:PassFilter(row) then count = count + 1; end
            row = enum:next();
        end
        return count;
    end
    function search:First()
        local enum = core.host:findTable("trades"):enumerator();
        local row = enum:next();
        while (row ~= nil) do
            if self:PassFilter(row) then return row; end
            row = enum:next();
        end
        return nil;
    end
    return search;
end

function trading:FindClosedTrade()
    local search = {};
    function search:WhenCustomID(custom_id) self.CustomID = custom_id; return self; end
    function search:WhenSide(bs) self.Side = bs; return self; end
    function search:WhenInstrument(instrument) self.Instrument = instrument; return self; end
    function search:WhenAccountID(account_id) self.AccountID = account_id; return self; end
    function search:WhenOpenOrderReqID(open_order_req_id) self.OpenOrderReqID = open_order_req_id; return self; end
    function search:WhenTradeIDRemain(trade_id_remain) self.TradeIDRemain = trade_id_remain; return self; end
    function search:WhenCloseOrderID(close_order_id) self.CloseOrderID = close_order_id; return self; end
    function search:PassFilter(row)
        if self.TradeIDRemain ~= nil and row.TradeIDRemain ~= self.TradeIDRemain then return false; end
        if self.CloseOrderID ~= nil and row.CloseOrderID ~= self.CloseOrderID then return false; end
        return (row.Instrument == self.Instrument or not self.Instrument)
            and (row.BS == self.Side or not self.Side)
            and (row.AccountID == self.AccountID or not self.AccountID)
            and (trading:GetCustomID(row.QTXT) == self.CustomID or not self.CustomID)
            and (row.OpenOrderReqID == self.OpenOrderReqID or not self.OpenOrderReqID);
    end
    function search:Do(action)
        local enum = core.host:findTable("closed trades"):enumerator();
        local row = enum:next();
        local count = 0
        while (row ~= nil) do
            if self:PassFilter(row) then
                if action(row) then
                    count = count + 1;
                end
            end
            row = enum:next();
        end
        return count;
    end
    function search:Any()
        local enum = core.host:findTable("closed trades"):enumerator();
        local row = enum:next();
        while (row ~= nil) do
            if self:PassFilter(row) then
                return true;
            end
            row = enum:next();
        end
        return false;
    end
    function search:All()
        local enum = core.host:findTable("closed trades"):enumerator();
        local row = enum:next();
        local trades = {};
        while (row ~= nil) do
            if self:PassFilter(row) then trades[#trades + 1] = row; end
            row = enum:next();
        end
        return trades;
    end
    function search:First()
        local enum = core.host:findTable("closed trades"):enumerator();
        local row = enum:next();
        while (row ~= nil) do
            if self:PassFilter(row) then return row; end
            row = enum:next();
        end
        return nil;
    end
    return search;
end

function trading:ParialClose(trade, amount)
    -- not finished
    local account = core.host:findTable("accounts"):find("AccountID", trade.AccountID);
    local id = self:getId();
    if account.Hedging == "Y" then
        local valuemap = core.valuemap();
        valuemap.BuySell = trade.BS == "B" and "S" or "B";
        valuemap.OrderType = "CM";
        valuemap.OfferID = trade.OfferID;
        valuemap.AcctID = trade.AccountID;
        valuemap.TradeID = trade.TradeID;
        valuemap.Quantity = math.min(amount, trade.Lot);
        local success, msg = terminal:execute(id, valuemap);
        if success then
            local res = trading:ClosePartialSuccessResult(msg);
            self._waiting_requests[id] = res;
            return res;
        end
        return trading:ClosePartialFailResult(msg);
    end

    local valuemap = core.valuemap();
    valuemap.OrderType = "OM";
    valuemap.OfferID = trade.OfferID;
    valuemap.AcctID = trade.AccountID;
    valuemap.Quantity = math.min(amount, trade.Lot);
    valuemap.BuySell = trading:getOppositeSide(trade.BS);
    local success, msg = terminal:execute(id, valuemap);
    if success then
        local res = trading:ClosePartialSuccessResult(msg);
        self._waiting_requests[id] = res;
        return res;
    end
    return trading:ClosePartialFailResult(msg);
end

function trading:ClosePartialSuccessResult(msg)
    local res = {};
    if msg ~= nil then res.Finished = false; else res.Finished = true; end
    res.RequestID = msg;
    function res:ToJSON()
        return trading:ObjectToJson(self);
    end
    return res;
end
function trading:ClosePartialFailResult(message)
    local res = {};
    res.Finished = true;
    res.Success = false;
    res.Error = message;
    return res;
end

function trading:Close(trade)
    local valuemap = core.valuemap();
    valuemap.BuySell = trade.BS == "B" and "S" or "B";
    valuemap.OrderType = "CM";
    valuemap.OfferID = trade.OfferID;
    valuemap.AcctID = trade.AccountID;
    valuemap.TradeID = trade.TradeID;
    valuemap.Quantity = trade.Lot;
    local success, msg = terminal:execute(self._ids_start + 3, valuemap);
    if not(success) then
        if self._signaler ~= nil then self._signaler:Signal("Close failed: " .. msg); end
        return false;
    end

    return true;
end

function trading:ObjectToJson(obj)
    local json = {};
    function json:AddStr(name, value)
        local separator = "";
        if self.str ~= nil then separator = ","; else self.str = ""; end
        self.str = self.str .. string.format("%s\"%s\":\"%s\"", separator, tostring(name), tostring(value));
    end
    function json:AddNumber(name, value)
        local separator = "";
        if self.str ~= nil then separator = ","; else self.str = ""; end
        self.str = self.str .. string.format("%s\"%s\":%f", separator, tostring(name), value or 0);
    end
    function json:AddBool(name, value)
        local separator = "";
        if self.str ~= nil then separator = ","; else self.str = ""; end
        self.str = self.str .. string.format("%s\"%s\":%s", separator, tostring(name), value and "true" or "false");
    end
    function json:AddTable(name, value)
        local str = trading:ObjectToJson(value);
        local separator = "";
        if self.str ~= nil then separator = ","; else self.str = ""; end
        self.str = self.str .. string.format("%s\"%s\":%s", separator, tostring(name), tostring(str));
    end
    function json:ToString() return "{" .. (self.str or "") .. "}"; end
    
    local first = true;
    for idx,t in pairs(obj) do
        local stype = type(t)
        if stype == "number" then json:AddNumber(idx, t);
        elseif stype == "string" then json:AddStr(idx, t);
        elseif stype == "boolean" then json:AddBool(idx, t);
        elseif stype == "function" then --do nothing
        elseif stype == "table" then json:AddTable(idx, t);
        else core.host:trace(tostring(idx) .. " " .. tostring(stype));
        end
    end
    return json:ToString();
end

function trading:CreateEntryOrderSuccessResult(msg)
    local res = {};
    if msg ~= nil then res.Finished = false; else res.Finished = true; end
    res.RequestID = msg;
    function res:IsOrderExecuted()
        return self.FixStatus ~= nil and self.FixStatus == "F";
    end
    function res:GetOrder()
        if self._order == nil then
            self._order = core.host:findTable("orders"):find("RequestID", self.RequestID);
            if self._order == nil then return nil; end
        end
        if not self._order:refresh() then return nil; end
        return self._order;
    end
    function res:GetTrade()
        if self._trade == nil then
            self._trade = core.host:findTable("trades"):find("OpenOrderReqID", self.RequestID);
            if self._trade == nil then return nil; end
        end
        if not self._trade:refresh() then return nil; end
        return self._trade;
    end
    function res:GetClosedTrade()
        if self._closed_trade == nil then
            self._closed_trade = core.host:findTable("closed trades"):find("OpenOrderReqID", self.RequestID);
            if self._closed_trade == nil then return nil; end
        end
        if not self._closed_trade:refresh() then return nil; end
        return self._closed_trade;
    end
    function res:ToJSON()
        return trading:ObjectToJson(self);
    end
    return res;
end
function trading:CreateEntryOrderFailResult(message)
    local res = {};
    res.Finished = true;
    res.Success = false;
    res.Error = message;
    function res:GetOrder() return nil; end
    function res:GetTrade() return nil; end
    function res:GetClosedTrade() return nil; end
    function res:IsOrderExecuted() return false; end
    return res;
end

function trading:EntryOrder(instrument)
    local builder = {};
    builder.Offer = core.host:findTable("offers"):find("Instrument", instrument);
    builder.Instrument = instrument;
    builder.Parent = self;
    builder.valuemap = core.valuemap();
    builder.valuemap.Command = "CreateOrder";
    builder.valuemap.OfferID = builder.Offer.OfferID;
    builder.valuemap.AcctID = self._account;
    function builder:_GetBaseUnitSize() if self._base_size == nil then self._base_size = core.host:execute("getTradingProperty", "baseUnitSize", self.Instrument, self.valuemap.AcctID); end return self._base_size; end

    function builder:SetAccountID(accountID) self.valuemap.AcctID = accountID; return self; end
    function builder:SetAmount(amount) self.amount = amount; return self; end
    function builder:SetRiskPercentOfEquityAmount(percent) self._RiskPercentOfEquityAmount = percent; return self; end
    function builder:SetPercentOfEquityAmount(percent) self._PercentOfEquityAmount = percent; return self; end
    function builder:UpdateOrderType()
        if self.valuemap.BuySell == nil or self.valuemap.Rate == nil then
            return;
        end
        if self.valuemap.BuySell == "B" then 
            self.valuemap.OrderType = self.Offer.Ask > self.valuemap.Rate and "LE" or "SE"; 
        else 
            self.valuemap.OrderType = self.Offer.Bid > self.valuemap.Rate and "SE" or "LE"; 
        end 
    end
    function builder:SetSide(buy_sell) 
        self.valuemap.BuySell = buy_sell; 
        self:UpdateOrderType();
        return self; 
    end
    function builder:SetRate(rate) 
        self.valuemap.Rate = rate; 
        self:UpdateOrderType();
        return self; 
    end
    function builder:SetPipLimit(limit_type, limit) self.valuemap.PegTypeLimit = limit_type or "M"; self.valuemap.PegPriceOffsetPipsLimit = self.valuemap.BuySell == "B" and limit or -limit; return self; end
    function builder:SetLimit(limit) self.valuemap.RateLimit = limit; return self; end
    function builder:SetPipStop(stop_type, stop, trailing_stop) self.valuemap.PegTypeStop = stop_type or "O"; self.valuemap.PegPriceOffsetPipsStop = self.valuemap.BuySell == "B" and -stop or stop; self.valuemap.TrailStepStop = trailing_stop; return self; end
    function builder:SetStop(stop, trailing_stop) self.valuemap.RateStop = stop; self.valuemap.TrailStepStop = trailing_stop; return self; end
    function builder:UseDefaultCustomId() self.valuemap.CustomID = self.Parent.CustomID; return self; end
    function builder:SetCustomID(custom_id) self.valuemap.CustomID = custom_id; return self; end
    function builder:GetValueMap() return self.valuemap; end
    function builder:AddMetadata(id, val) if self._metadata == nil then self._metadata = {}; end self._metadata[id] = val; return self; end
    function builder:BuildValueMap()
        self.valuemap.Quantity = self.amount * self:_GetBaseUnitSize();
        if self._metadata ~= nil then
            self._metadata.CustomID = self.valuemap.CustomID;
            self.valuemap.CustomID = trading:ObjectToJson(self._metadata);
        end
        if self._PercentOfEquityAmount ~= nil then
            local equity = core.host:findTable("accounts"):find("AccountID", self.valuemap.AcctID).Equity;
            local used_equity = equity * self._PercentOfEquityAmount / 100.0;
            local emr = core.host:getTradingProperty("EMR", self.Offer.Instrument, self.valuemap.AcctID);
            self.valuemap.Quantity = math.floor(used_equity / emr) * self:_GetBaseUnitSize();
        elseif self._RiskPercentOfEquityAmount ~= nil then
            local equity = core.host:findTable("accounts"):find("AccountID", self.valuemap.AcctID).Equity;
            local affordable_loss = equity * self._RiskPercentOfEquityAmount / 100.0;
            assert(self.valuemap.RateStop ~= nil, "Only absolute stop is supported");
            local stop = math.abs(self.valuemap.RateStop - self.valuemap.Rate) / self.Offer.PointSize;
            local possible_loss = self.Offer.PipCost * stop;
            self.valuemap.Quantity = math.floor(affordable_loss / possible_loss) * self:_GetBaseUnitSize();
        end
        return self.valuemap;
    end
    function builder:Execute()
        self:BuildValueMap();
        local id = self.Parent:getId();
        local success, msg = terminal:execute(id, self.valuemap);
        if not(success) then
            local message = "Open order failed: " .. msg;
            self.Parent:trace(message);
            if self.Parent._signaler ~= nil then self.Parent._signaler:Signal(message); end
            return trading:CreateEntryOrderFailResult(message);
        end
        local res = trading:CreateEntryOrderSuccessResult(msg);
        self.Parent._waiting_requests[id] = res;
        return res;
    end
    return builder;
end

function trading:StoreMarketOrderResults(res)
    local str = "[";
    for i, t in ipairs(res) do
        local json = t:ToJSON();
        if str == "[" then str = str .. json; else str = str .. "," .. json; end
    end
    return str .. "]";
end
function trading:RestoreMarketOrderResults(str)
    local results = {};
    local position = 2;
    local result;
    while (position < str:len()) do
        local ch = string.sub(str, position, position);
        if ch == "{" then
            result = trading:CreateMarketOrderSuccessResult();
            position = position + 1;
        elseif ch == "}" then
            results[#results + 1] = result;
            result = nil;
            position = position + 1;
        elseif ch == "," then
            position = position + 1;
        else
            local name, value = string.match(str, '"([^"]+)":("?[^,}]+"?)', position);
            if value == "false" then
                result[name] = false;
                position = position + name:len() + 8;
            elseif value == "true" then
                result[name] = true;
                position = position + name:len() + 7;
            else
                if string.sub(value, 1, 1) == "\"" then
                    result[name] = value;
                    value:sub(2, value:len() - 1);
                    position = position + name:len() + 3 + value:len();
                else
                    result[name] = tonumber(value);
                    position = position + name:len() + 3 + value:len();
                end
            end
        end
    end
    return results;
end
function trading:CreateMarketOrderSuccessResult(msg)
    local res = {};
    if msg ~= nil then res.Finished = false; else res.Finished = true; end
    res.RequestID = msg;
    function res:GetTrade()
        if self._trade == nil then
            self._trade = core.host:findTable("trades"):find("OpenOrderReqID", self.RequestID);
            if self._trade == nil then return nil; end
        end
        if not self._trade:refresh() then return nil; end
        return self._trade;
    end
    function res:GetClosedTrade()
        if self._closed_trade == nil then
            self._closed_trade = core.host:findTable("closed trades"):find("OpenOrderReqID", self.RequestID);
            if self._closed_trade == nil then return nil; end
        end
        if not self._closed_trade:refresh() then return nil; end
        return self._closed_trade;
    end
    function res:ToJSON()
        local json = {};
        function json:AddStr(name, value)
            local separator = "";
            if self.str ~= nil then separator = ","; else self.str = ""; end
            self.str = self.str .. string.format("%s\"%s\":\"%s\"", separator, tostring(name), tostring(value));
        end
        function json:AddNumber(name, value)
            local separator = "";
            if self.str ~= nil then separator = ","; else self.str = ""; end
            self.str = self.str .. string.format("%s\"%s\":%f", separator, tostring(name), value or 0);
        end
        function json:AddBool(name, value)
            local separator = "";
            if self.str ~= nil then separator = ","; else self.str = ""; end
            self.str = self.str .. string.format("%s\"%s\":%s", separator, tostring(name), value and "true" or "false");
        end
        function json:ToString() return "{" .. (self.str or "") .. "}"; end
        
        local first = true;
        for idx,t in pairs(self) do
            local stype = type(t)
            if stype == "number" then json:AddNumber(idx, t);
            elseif stype == "string" then json:AddStr(idx, t);
            elseif stype == "boolean" then json:AddBool(idx, t);
            elseif stype == "function" or stype == "table" then --do nothing
            else core.host:trace(tostring(idx) .. " " .. tostring(stype));
            end
        end
        return json:ToString();
    end
    return res;
end
function trading:CreateMarketOrderFailResult(message)
    local res = {};
    res.Finished = true;
    res.Success = false;
    res.Error = message;
    function res:GetTrade() return nil; end
    return res;
end

function trading:MarketOrder(instrument)
    local builder = {};
    local offer = core.host:findTable("offers"):find("Instrument", instrument);
    builder.Instrument = instrument;
    builder.Offer = offer;
    builder.Parent = self;
    builder.valuemap = core.valuemap();
    builder.valuemap.Command = "CreateOrder";
    builder.valuemap.OrderType = "OM";
    builder.valuemap.OfferID = offer.OfferID;
    builder.valuemap.AcctID = self._account;
    function builder:_GetBaseUnitSize() if self._base_size == nil then self._base_size = core.host:execute("getTradingProperty", "baseUnitSize", self.Instrument, self.valuemap.AcctID); end return self._base_size; end
    function builder:SetAccountID(accountID) self.valuemap.AcctID = accountID; return self; end
    function builder:SetAmount(amount) self._amount = amount; return self; end
    function builder:SetRiskPercentOfEquityAmount(percent) self._RiskPercentOfEquityAmount = percent; return self; end
    function builder:SetPercentOfEquityAmount(percent) self._PercentOfEquityAmount = percent; return self; end
    function builder:SetSide(buy_sell) self.valuemap.BuySell = buy_sell; return self; end
    function builder:SetPipLimit(limit_type, limit)
        self.valuemap.PegTypeLimit = limit_type or "O";
        self.valuemap.PegPriceOffsetPipsLimit = self.valuemap.BuySell == "B" and limit or -limit;
        return self;
    end
    function builder:SetLimit(limit) self.valuemap.RateLimit = limit; return self; end
    function builder:SetPipStop(stop_type, stop, trailing_stop)
        self.valuemap.PegTypeStop = stop_type or "O";
        self.valuemap.PegPriceOffsetPipsStop = self.valuemap.BuySell == "B" and -stop or stop;
        self.valuemap.TrailStepStop = trailing_stop;
        return self;
    end
    function builder:SetStop(stop, trailing_stop) self.valuemap.RateStop = stop; self.valuemap.TrailStepStop = trailing_stop; return self; end
    function builder:SetCustomID(custom_id) self.valuemap.CustomID = custom_id; return self; end
    function builder:GetValueMap() return self.valuemap; end
    function builder:AddMetadata(id, val) if self._metadata == nil then self._metadata = {}; end self._metadata[id] = val; return self; end
    function builder:FillFields()
        local base_size = self:_GetBaseUnitSize();
        if self._metadata ~= nil then
            self._metadata.CustomID = self.valuemap.CustomID;
            self.valuemap.CustomID = trading:ObjectToJson(self._metadata);
        end
        if self._PercentOfEquityAmount ~= nil then
            local equity = core.host:findTable("accounts"):find("AccountID", self.valuemap.AcctID).Equity;
            local used_equity = equity * self._PercentOfEquityAmount / 100.0;
            local emr = core.host:getTradingProperty("EMR", self.Offer.Instrument, self.valuemap.AcctID);
            self.valuemap.Quantity = math.floor(used_equity / emr) * base_size;
            core.host:trace(used_equity / emr);
        elseif self._RiskPercentOfEquityAmount ~= nil then
            local equity = core.host:findTable("accounts"):find("AccountID", self.valuemap.AcctID).Equity;
            local affordable_loss = equity * self._RiskPercentOfEquityAmount / 100.0;
            assert(self.valuemap.PegPriceOffsetPipsStop ~= nil, "Only pip stop are supported");
            local possible_loss = self.Offer.PipCost * self.valuemap.PegPriceOffsetPipsStop;
            self.valuemap.Quantity = math.floor(affordable_loss / possible_loss) * base_size;
        else
            self.valuemap.Quantity = self._amount * base_size;
        end
    end
    function builder:Execute()
        self.Parent:trace(string.format("Creating %s OM for %s", self.valuemap.BuySell, self.Instrument));
        self:FillFields();
        local id = self.Parent:getId();
        local success, msg = terminal:execute(id, self.valuemap);
        if not(success) then
            local message = "Open order failed: " .. msg;
            self.Parent:trace(message);
            if self.Parent._signaler ~= nil then
                self.Parent._signaler:Signal(message);
            end
            return trading:CreateMarketOrderFailResult(message);
        end
        local res = trading:CreateMarketOrderSuccessResult(msg);
        self.Parent._waiting_requests[id] = res;
        return res;
    end
    return builder;
end

function trading:ReadValue(json, position)
    local whaitFor = "";
    local start = position;
    while (position < json:len() + 1) do
        local ch = string.sub(json, position, position);
        position = position + 1;
        if ch == "\"" then
            start = position - 1;
            whaitFor = ch;
            break;
        elseif ch == "{" then
            start = position - 1;
            whaitFor = "}";
            break;
        elseif ch == "," or ch == "}" then
            return string.sub(json, start, position - 2), position - 1;
        end
    end
    while (position < json:len() + 1) do
        local ch = string.sub(json, position, position);
        position = position + 1;
        if ch == whaitFor then
            return string.sub(json, start, position - 1), position;
        end
    end
    return "", position;
end
function trading:JsonToObject(json)
    local position = 1;
    local result;
    local results;
    while (position < json:len() + 1) do
        local ch = string.sub(json, position, position);
        if ch == "{" then
            result = {};
            position = position + 1;
        elseif ch == "}" then
            if results ~= nil then
                position = position + 1;
                results[#results + 1] = result;
            else
                return result;
            end
        elseif ch == "," then
            position = position + 1;
        elseif ch == "[" then
            position = position + 1;
            results = {};
        elseif ch == "]" then
            return results;
        else
            if result == nil then
                return nil;
            end
            local name = string.match(json, '"([^"]+)":', position);
            local value, new_pos = trading:ReadValue(json, position + name:len() + 3);
            position = new_pos;
            if value == "false" then
                result[name] = false;
            elseif value == "true" then
                result[name] = true;
            else
                if string.sub(value, 1, 1) == "\"" then
                    result[name] = value:sub(2, value:len() - 1);
                elseif string.sub(value, 1, 1) == "{" then
                    result[name] = trading:JsonToObject(value);
                else
                    result[name] = tonumber(value);
                end
            end
        end
    end
    return nil;
end

function trading:GetMetadata(qtxt)
    if qtxt == "" then
        return nil;
    end
    local position = 1;
    local result;
    while (position < qtxt:len() + 1) do
        local ch = string.sub(qtxt, position, position);
        if ch == "{" then
            result = {};
            position = position + 1;
        elseif ch == "}" then
            return result;
        elseif ch == "," then
            position = position + 1;
        else
            if result == nil then
                return nil;
            end
            local name, value = string.match(qtxt, '"([^"]+)":("?[^,}]+"?)', position);
            if value == "false" then
                result[name] = false;
                position = position + name:len() + 8;
            elseif value == "true" then
                result[name] = true;
                position = position + name:len() + 7;
            else
                if string.sub(value, 1, 1) == "\"" then
                    result[name] = value;
                    value:sub(2, value:len() - 1);
                    position = position + name:len() + 3 + value:len();
                else
                    result[name] = tonumber(value);
                    position = position + name:len() + 3 + value:len();
                end
            end
        end
    end
    return nil;
end

function trading:GetTradeMetadata(trade)
    return self:GetMetadata(trade.QTXT);
end
trading:RegisterModule(Modules);
