-- More information about this indicator can be found at:
--http://fxcodebase.com/code/viewtopic.php?f=17&t=60028
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function Init()
    indicator:name("Wilders Trailing Stop indicator");
    indicator:description("Wilders Trailing Stop indicator");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);

    indicator.parameters:addGroup("Calculation");
    indicator.parameters:addInteger("Period", "Period", "", 5);
    indicator.parameters:addDouble("Coeff", "Coeff", "", 3.5);

    indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("UPclr", "UP color", "UP color", core.rgb(0, 255, 0));
    indicator.parameters:addColor("DNclr", "DN color", "DN color", core.rgb(255, 0, 0));
    indicator.parameters:addInteger("widthLinReg", "Line width", "Line width", 1, 1, 5);
    indicator.parameters:addInteger("styleLinReg", "Line style", "Line style", core.LINE_SOLID);
    indicator.parameters:setFlag("styleLinReg", core.FLAG_LINE_STYLE);
	
	indicator.parameters:addGroup("Mode");  
	indicator.parameters:addString("Live", "End of Turn / Live", "", "Live");
    indicator.parameters:addStringAlternative("Live", "End of Turn", "", "End of Turn");
	indicator.parameters:addStringAlternative("Live", "Live", "", "Live");   
	
	indicator.parameters:addGroup("Alert Style");
    indicator.parameters:addColor("UpTrendColor", "Up Trend Color", "", core.rgb(0, 0, 255));
	indicator.parameters:addColor("DownTrendColor", "Down Trend Color", "", core.rgb(0, 0, 255));
	indicator.parameters:addInteger("Size", "Label Size", "", 10, 1 , 100);
	
	indicator.parameters:addGroup("Alerts Sound");   
    indicator.parameters:addBoolean("PlaySound", "Play Sound", "", true);	
    indicator.parameters:addBoolean("RecurrentSound", "Recurrent Sound", "", false);
	indicator.parameters:addBoolean("ShowAlert", "Show Alert", "", true);
	
	indicator.parameters:addGroup("Alerts Email");   
	indicator.parameters:addBoolean("SendEmail", "Send Email", "", true);
    indicator.parameters:addString("Email", "Email", "", "");
    indicator.parameters:setFlag("Email", core.FLAG_EMAIL);
	indicator.parameters:addBoolean("Show", "Show Dialog box Alert", "", true);
	 
	
	Parameters (1, "Price/ WTS Line Cross")
end


function Parameters ( id, Label )
  
  
   indicator.parameters:addGroup(Label .. " Alert");
   indicator.parameters:addBoolean("ON"..id , "Show " .. Label .." Alert" , "", true);
  
    indicator.parameters:addBoolean("OnlyOnce", "Alert Once", "Subsequent Alert will be ignored.", false);	

    indicator.parameters:addFile("Up"..id, Label .. " Cross Over Sound", "", "");
    indicator.parameters:setFlag("Up"..id, core.FLAG_SOUND);
	
	indicator.parameters:addFile("Down"..id, Label .. " Cross Under Sound", "", "");
    indicator.parameters:setFlag("Down"..id, core.FLAG_SOUND);
	
	 indicator.parameters:addString("Label"..id, "Label", "", Label);

end 

local 	Number = 1;

local first;
local source = nil;
local Period;
local Coeff;
local ATR;
local WTS=nil;
 
--
local Up={};
local Down={};
local Label={};
local ON={};
local Size;
local Email;
local SendEmail;
local  RecurrentSound ,SoundFile  ;
local Show;
local Alert;
local PlaySound;
local Live;
local FIRST=true;
local OnlyOnce;
local U={};
local D={};
local UpTrendColor, DownTrendColor;
local OnlyOnceFlag;
local font;
local ShowAlert;
--

function Prepare(nameOnly)   
 
    source = instance.source;
    Period=instance.parameters.Period;
    Coeff=instance.parameters.Coeff;
	
	local name = profile:id() .. "(" .. source:name() .. ", " .. instance.parameters.Period .. ", " .. instance.parameters.Coeff .. ")";
    instance:name(name);
	
	if   (nameOnly) then
        return;
    end
	
  
    ATR = core.indicators:create("ATR", source, Period);
	 first = ATR.DATA:first();
    
    WTS = instance:addStream("WTS", core.Line, name .. ".WTS", "WTS", instance.parameters.UPclr, first);
    WTS:setWidth(instance.parameters.widthLinReg);
    WTS:setStyle(instance.parameters.styleLinReg);
	
	
	OnlyOnceFlag=true;
	FIRST=true;
	OnlyOnce = instance.parameters.OnlyOnce;
	ShowAlert = instance.parameters.ShowAlert;
	Show = instance.parameters.Show;
	Live = instance.parameters.Live;
	UpTrendColor = instance.parameters.UpTrendColor;
	DownTrendColor = instance.parameters.DownTrendColor;
	Size=instance.parameters.Size;
	
	font = core.host:execute("createFont", "Wingdings", Size, false, false);
	  
	Initialization();
end


function  Initialization ()
    
	 SendEmail = instance.parameters.SendEmail;
	 
	 local i;
	 for i = 1, Number , 1 do 
	  Label[i]=instance.parameters:getString("Label" .. i);
	  ON[i]=instance.parameters:getBoolean("ON" .. i);
	 end
	 
	 
	 

    if SendEmail then
        Email = instance.parameters.Email;
    else
        Email = nil;
    end
    assert(not(SendEmail) or (SendEmail and Email ~= ""), "E-mail address must be specified");
	
	
	 PlaySound = instance.parameters.PlaySound;
    if PlaySound then
    
	  for i = 1, Number , 1 do 
	  Up[i]=instance.parameters:getString("Up" .. i);
	  Down[i]=instance.parameters:getString("Down" .. i);
	  end
	
    else 
	
	  for i = 1, Number , 1 do 
       Up[i]=nil;
	  Down[i]=nil;
	  end
		
    end
    
        for i = 1, Number , 1 do 
	  assert(not(PlaySound) or (PlaySound and Up[i] ~= "") or (PlaySound and Up[i] ~= ""), "Sound file must be chosen"); 
	 assert(not(PlaySound) or (PlaySound and Down[i] ~= "") or (PlaySound and Down[i] ~= ""), "Sound file must be chosen");
	end
	 
    RecurrentSound = instance.parameters.RecurrentSound;
	
	for i = 1, Number , 1 do 
	U[i] = nil;
	D[i] = nil;	 
	end
		 
end	

function Update(period, mode)
   ATR:update(mode);
   
   if period<first then
   return;
   end
    
  Calculation (period);
  
  
     core.host:execute ("removeLabel", source:serial(period)); 
   
     if period < first then
	 return;
	 end
	
    Activate (1, period)
  
end

function Calculation(period)
  local loss=ATR.DATA[period]*Coeff;
    if source.close[period]>WTS[period-1] and source.close[period-1]>WTS[period-1] then
     WTS[period]=math.max(WTS[period-1], source.close[period]-loss);
     WTS:setColor(period, instance.parameters.DNclr);
    elseif source.close[period]<WTS[period-1] and source.close[period-1]<WTS[period-1] then
     WTS[period]=math.min(WTS[period-1], source.close[period]+loss);
     WTS:setColor(period, instance.parameters.UPclr);
    elseif source.close[period]>WTS[period-1] then
     WTS[period]=source.close[period]-loss;
     WTS:setColor(period, instance.parameters.DNclr);
    else
     WTS[period]=source.close[period]+loss;
     WTS:setColor(period, instance.parameters.UPclr);
    end 
  end 
  
  
  
   function ReleaseInstance()
       core.host:execute("deleteFont", font);
end	   

function Activate (id, period)

   local Shift=0;
   

   if Live~= "Live" then
	period=period-1;
	Shift=1;
	end
 
	  if id == 1  and ON[id]  then
	  
	       
			if  source.close[period] > WTS[period] 
			and   source.close[period-1] <= WTS[period-1] 
			then
			           
						    
             core.host:execute("drawLabel1", source:serial(period), source:date(period),  core.CR_CHART, WTS[period], core.CR_CHART, core.H_Center, core.V_Bottom, font, UpTrendColor, "\225");

 						 
						   
			
			 D[id] = nil;
						   
							  if U[id]~=source:serial(period) 
							  and period == source:size()-1-Shift
							  and not FIRST 
							  then
							  OnlyOnceFlag=false;
							  U[id]=source:serial(period);
							  SoundAlert(Up[id]);
							  EmailAlert(  Label[id], " Cross Over", period);
							  SendAlert("Crossed over");  
							        
									Pop(Label[id], " Cross Over " );  	
								    
								 
							  end
			elseif  source.close[period] < WTS[period] 
			and   source.close[period-1] >= WTS[period-1] 
            then			
			
			            			 
			               core.host:execute("drawLabel1", source:serial(period), source:date(period),  core.CR_CHART, WTS[period], core.CR_CHART, core.H_Center, core.V_Top, font, UpTrendColor, "\226");						   
						   
		     U[id] = nil;
		   
			                 if  D[id]~=source:serial(period)
							 and period == source:size()-1-Shift
							 and not FIRST 
							 then
							 OnlyOnceFlag=false;
							 D[id]=source:serial(period);
							 SoundAlert(Down[id]);			 
							 EmailAlert( Label[id] , " Cross Under", period);	
								 
									Pop(Label[id], " Cross Under " );  	
								    SendAlert("Crossed under");
							 
			                  end			   
	         end
			
	  
	 
	  end
	  
		   
        if FIRST then
        FIRST=false;      
        end		

end


function AsyncOperationFinished (cookie, success, message)
end


function Pop(label , note)
  
   if not Show then
   return;
   end
  
   core.host:execute ("prompt", 1, label ,   " ( " .. source:instrument() .. " : " .. source:barSize() .. " ) "  ..   label .. " : " .. note );
 

end


function SendAlert(message)
    if not ShowAlert then
        return;
    end
 
 
      
    terminal:alertMessage(source:instrument(), source[NOW], message, source:date(NOW));
end

function SoundAlert(Sound)
 if not PlaySound then
 return;
 end

  if OnlyOnce and OnlyOnceFlag== false then
 return;
 end

 
 terminal:alertSound(Sound, RecurrentSound);
end
 


function EmailAlert( label , Subject, period)

if not SendEmail then
return
end

 if OnlyOnce and OnlyOnceFlag== false then
 return;
 end

 
    local date = source:date(period);
	local DATA = core.dateToTable (date);
	
    
   local delim = "\013\010";  
   local Note=  profile:id().. delim.. " Label : " ..label  .. delim .. " Alert : " .. Subject ;   
   local Symbol= "Instrument : " .. source:instrument() ;
   local Time =  " Date : " .. DATA.month.." / ".. DATA.day .." Time:  ".. DATA.hour  .." / ".. DATA.min .." / ".. DATA.sec;     
   
    local TF= "Time Frame : " .. source:barSize();       
    local text = Note  .. delim ..  Symbol .. delim .. TF  .. delim .. Time;

	
 
  terminal:alertEmail(Email, profile:id(), text);
end