-- Id: 18239
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=31&t=2791

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function Init()
    strategy:name("Set stop by fractals");
    strategy:description("Strategy changes stop followiung to the fractals");

    strategy.parameters:addGroup("Fractal Parameters");
    strategy.parameters:addInteger("Frame", "Number of bars for fractals (Odd)", "", 5, 5, 99);
    
    strategy.parameters:addGroup("Stop Parameters");
    strategy.parameters:addInteger("Indent", "Indent from fractal", "", 0, 0, 1000);
    strategy.parameters:addBoolean("MoveBack", "Move stop back", "", false);

    strategy.parameters:addString("Type", "Price type", "", "Bid");
    strategy.parameters:addStringAlternative("Type", "Bid", "", "Bid");
    strategy.parameters:addStringAlternative("Type", "Ask", "", "Ask");
    strategy.parameters:addString("Period", "Timeframe", "", "m1");
    strategy.parameters:setFlag("Period", core.FLAG_PERIODS);

    strategy.parameters:addGroup("Order");
    strategy.parameters:addBoolean("AllowTrade", "Allow strategy to trade", "", true);
    strategy.parameters:setFlag("AllowTrade", core.FLAG_ALLOW_TRADE);
    strategy.parameters:addString("Order", "Choose Order", "", "");
    strategy.parameters:setFlag("Order", core.FLAG_ORDER);
end

local tradeExist = true;
local first = true;
local stopOrder = nil;      -- the identifier of the stop order
local tsource = nil;
local timer;
local minChange;
local executing = false;

function Prepare(onlyName)
    local name;
    name = profile:id() .. "(" .. instance.bid:instrument()  .. "[" .. instance.parameters.Period  .. "]" ..
                           "," .. instance.parameters.Frame .. 
                           "," .. instance.parameters.Indent .. 
                           "," .. instance.parameters.Order .. ")";
    instance:name(name);
    if onlyName then
        return ;
    end

    minChange = math.pow(10, -instance.bid:getPrecision());

    ExtSetupSignal(name .. ":", true);
    tsource = ExtSubscribe(1, nil, instance.parameters.Period, instance.parameters.Type == "Bid", "bar");
end

function ExtUpdate(id, source, period)
    if id == 1 and tradeExist then
        local Shift=math.floor(instance.parameters.Frame/2);
        if period > tsource:first()+instance.parameters.Frame then
            -- check whether order exists
            local order;

            if not(core.host:execute("isTableFilled", "orders")) then
                core.host:trace("not filled");
                -- relogin??
                return ;
            end

            if not(core.host:execute("isReadyForTrade")) then
                -- relogin??
                core.host:trace("not ready");
                return ;
            end

            order = core.host:findTable("orders"):find("OrderID", instance.parameters.Order);

            if order == nil then
                tradeExist = false;
                terminal:alertMessage(instance.bid:instrument(), instance.bid[NOW], "Order " .. instance.parameters.Order .. " disappear", instance.bid:date(NOW));
                core.host:execute("stop");
                return ;
            end

            local stopValue, valuemap, success, msg;
            local stopSide;
            local Fl=true;
            if order.BS == "B" then
                for i=1,Shift,1 do
                    if tsource.low[period-i-Shift]<=tsource.low[period-Shift] or tsource.low[period+i-Shift]<=tsource.low[period-Shift] then
                        Fl=false;
                    end
                end
                if Fl==true then
                    stopValue=tsource.low[period-Shift]-instance.parameters.Indent*instance.bid:pipSize();
                    if instance.parameters.MoveBack==false then
                        if order.StopOrderID ~= "" and order.StopOrderID ~= nil then
                            if stopValue<order.Stop then
                                return ;
                            end
                        end 
                    end 
                else
                    return ;
                end
                stopSide = "S";
                if stopValue >= instance.bid[NOW] then
                    --core.host:trace(string.format("not passed %f >= %f", stopValue, instance.bid[NOW]));
                    return ;
                end
            else
                for i=1,Shift,1 do
                    if tsource.high[period-i-Shift]>=tsource.high[period-Shift] or tsource.high[period+i-Shift]>=tsource.high[period-Shift] then
                        Fl=false;
                    end
                end
                if Fl==true then
                    stopValue=tsource.high[period-Shift]+instance.parameters.Indent*instance.bid:pipSize();
                    if instance.parameters.MoveBack==false then
                        if order.StopOrderID ~= "" and order.StopOrderID ~= nil then
                            if stopValue>order.Stop then
                                return ;
                            end
                        end 
                    end 
                else
                    return ;
                end
                stopSide = "B";
                if stopValue <= instance.ask[NOW] then
                    --core.host:trace(string.format("not passed %f <= %f", stopValue, instance.ask[NOW]));
                    return ;
                end
            end

            if instance.parameters.AllowTrade then
                if order.StopOrderID == "" or order.StopOrderID == nil then
                    valuemap = core.valuemap();
                    valuemap.Command = "CreateOrder";
                    valuemap.OrderType = "S";
                    valuemap.OfferID = order.OfferID;
                    valuemap.AcctID = order.AccountID;
                    valuemap.TradeID = order.TradeID;
                    valuemap.Quantity = order.Lot;
                    valuemap.Rate = stopValue;
                    valuemap.BuySell = stopSide;
                    executing = true;
                    success, msg = terminal:execute(200, valuemap);
                    if not(success) then
                        executing = false;
                        terminal:alertMessage(instance.bid:instrument(), instance.bid[NOW], "Failed create stop " .. msg, instance.bid:date(NOW));
                    end
                else
                    if math.abs(stopValue - order.Stop) > minChange then
                        -- stop exists
                        valuemap = core.valuemap();
                        valuemap.Command = "EditOrder";
                        valuemap.AcctID = order.AccountID;
                        valuemap.OrderID = order.StopOrderID;
                        valuemap.Rate = stopValue;
                        executing = true;
                        success, msg = terminal:execute(200, valuemap);
                        if not(success) then
                            executing = false;
                            terminal:alertMessage(instance.bid:instrument(), instance.bid[NOW], "Failed change stop " .. msg, instance.bid:date(NOW));
                        end
                    end
                end
            end
        end

    end
end

function ExtAsyncOperationFinished(id, success, message)
    if id == 200 then
        executing = false;
        if not(success) then
            terminal:alertMessage(instance.bid:instrument(), instance.bid[NOW], "Failed create/change stop " .. message, instance.bid:date(NOW));
        end
    end
end

dofile(core.app_path() .. "\\strategies\\standard\\include\\helper.lua");