-- Id: 1093
-- More information about this indicator can be found at:
-- http://fxcodebase.com/

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--+------------------------------------------------------------------+
function Init()
    strategy:name("Trailing Stop Signal");
	strategy:setTag("NonOptimizableParameters", "Email,SendEmail,SoundFile,RecurrentSound,PlaySound,ShowAlert");
    strategy:description("Trailing Stop Signal");

    strategy.parameters:addGroup("Parameters");
  
    strategy.parameters:addString("Type", "Price type", "", "Bid");
    strategy.parameters:addStringAlternative("Type", "Bid", "", "Bid");
    strategy.parameters:addStringAlternative("Type", "Ask", "", "Ask");
	
	strategy.parameters:addString("method", "Method", "ATR" , "ATR");
	strategy.parameters:addStringAlternative("method", "ATR", "ATR" , "ATR");
	strategy.parameters:addStringAlternative("method", "Percentage", "Percentage" , "Percentage");
	
	strategy.parameters:addDouble("P", "Percentage ", "Percentage ", 3, 0, 100);	
    strategy.parameters:addInteger("AP", "ATR period ", "ATR Period ", 14);
	strategy.parameters:addDouble("AM", "ATR multiplicator ", "ATR multiplicator ", 3.5);
	  
    strategy.parameters:addString("Period", "Timeframe", "", "m1");
    strategy.parameters:setFlag("Period", core.FLAG_PERIODS);

    strategy.parameters:addGroup("Signals");

    strategy.parameters:addBoolean("ShowAlert", "Show Alert", "", true);
    strategy.parameters:addBoolean("PlaySound", "Play Sound", "", false);
    strategy.parameters:addFile("SoundFile", "Sound File", "", "");
end

local SoundFile;

local TS=nil;
local Method=nil;
local Percentage=nil;
local ATRFrame=nil;
local ATRMultiplicator =nil

local Up=nil;
local Down=nil;


local BarSource = nil; 


function Prepare()
   
    ShowAlert = instance.parameters.ShowAlert;
    if instance.parameters.PlaySound then
        SoundFile = instance.parameters.SoundFile;
    else
        SoundFile = nil;
    end
	
	Method = instance.parameters.method;
	Percentage = instance.parameters.P;
	ATRFrame=instance.parameters.AP;
    ATRMultiplicator = instance.parameters.AM;
	   

    assert(not(PlaySound) or (PlaySound and SoundFile ~= ""), "Sound file must be specified");
    assert(instance.parameters.Period ~= "t1", "Signal cannot be applied on ticks");

    
	Up = " Up Trend";
	Down = " Down Trend";
	
    ExtSetupSignal(" Trailing Stop", ShowAlert);

    BarSource = ExtSubscribe(1, nil, instance.parameters.Period, instance.parameters.Type == "Bid", "bar");
		
    assert(core.indicators:findIndicator("TS") ~= nil, "TS" .. " indicator must be installed");
	TS  = core.indicators:create("TS", BarSource, Method, Percentage, ATRFrame, ATRMultiplicator);
	
	    
    local name = profile:id() .. "Trailing Stop";
    instance:name(name);
end



function ExtUpdate(id, source, period)


    if period > ATRFrame then
	
	
                            TS:update(core.UpdateLast);
	
				
							if  core.crossesOver( BarSource.close, TS.DATA, period)  then						
							   ExtSignal(BarSource.close, period, Up, SoundFile);							
							end
							
							if  core.crossesUnder( BarSource.close, TS.DATA, period)   then	
							    ExtSignal(BarSource.close, period, Down, SoundFile);
							end
							
	end						
  
end

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