-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=249

--+------------------------------------------------------------------+
--|                               Copyright © 2018, Gehtsoft USA LLC | 
--|                                            http://fxcodebase.com |
--+------------------------------------------------------------------+
--|                                      Developed by : Mario Jemic  |                    
--|                                          mario.jemic@gmail.com   |
--+------------------------------------------------------------------+
--|                                 Support our efforts by donating  | 
--|                                    Paypal: https://goo.gl/9Rj74e |
--+------------------------------------------------------------------+
--|                                Patreon :  https://goo.gl/GdXWeN  |  
--|                    BitCoin : 15VCJTLaz12Amr7adHSBtL9v8XomURo9RF  |  
--|                BitCoin Cash: 1BEtS465S3Su438Kc58h2sqvVvHK9Mijtg  | 
--|           Ethereum : 0x8C110cD61538fb6d7A2B47858F0c0AaBd663068D  |  
--|                   LiteCoin : LLU8PSY2vsq7B9kRELLZQcKf5nJQrdeqwD  |  
--+------------------------------------------------------------------+

function Init()
    indicator:name("Schaff Trend Cycle Oscillator");
    indicator:description("");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);
	
	
    indicator.parameters:addGroup("Calculation");	 
    indicator.parameters:addInteger("C", "Schaff cycle periods", "", 10, 2, 10000);
    indicator.parameters:addInteger("S", "Short periods", "", 23, 2, 10000);
    indicator.parameters:addInteger("L", "Long periods", "", 50, 2, 10000);
	
	indicator.parameters:addGroup("Style");	
    indicator.parameters:addColor("clrUp", "Color of Up line", "", core.rgb(0, 255, 0));
	indicator.parameters:addColor("clrDown", "Color of Down line", "", core.rgb(255, 0, 0));
	indicator.parameters:addInteger("width", "Line width", "", 1, 1, 5);
    indicator.parameters:addInteger("style", "Line style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style", core.FLAG_LINE_STYLE);
	
	indicator.parameters:addGroup("OB/OS Levels");	
    indicator.parameters:addDouble("OB", "Overbought Level","", 30);
    indicator.parameters:addDouble("OS","Oversold Level","", 70);
    indicator.parameters:addInteger("level_overboughtsold_width","Line width","", 1, 1, 5);
    indicator.parameters:addInteger("level_overboughtsold_style", "Line Style","", core.LINE_SOLID);
    indicator.parameters:addColor("level_overboughtsold_color", "Line Color","", core.rgb(128, 128, 128));
    indicator.parameters:setFlag("level_overboughtsold_style", core.FLAG_LEVEL_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("Up", "Up Trend Color", "", core.rgb(0, 0, 255));
	indicator.parameters:addColor("Down", "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: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, "Central Line");
	Parameters (2, "Overbought Line");
	Parameters (3, "Oversold Line");
 
end



function Parameters ( id, Label )
  
  
   indicator.parameters:addGroup(Label .. " Alert");
  
    indicator.parameters:addBoolean("ON"..id , "Show " .. Label .." Alert" , "", true);


    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 = 3;

local Up={};
local Down={};
local Label={};
local ON={};
local Line;
local up={};
local down={};
local Size;
local Email;
local SendEmail;
local  RecurrentSound ,SoundFile  ;
local Show;
local Alert;
local PlaySound;
local Live;
local FIRST=true; 

local U={};
local D={};


local OB,OS;
local firstmcd = 0;
local firstst = 0;
local first = 0;
local S = 0;
local L = 0;
local C = 0;
local source = nil;
local out = nil;
local wmas, wmal, wmast;
local st, mcd

-- initializes the instance of the indicator
function Prepare(nameOnly) 
    source = instance.source;
	
	FIRST=true;
	Show = instance.parameters.Show;
	Live = instance.parameters.Live;	
	
	OB = instance.parameters.OB;
	OS = instance.parameters.OS;
    S = instance.parameters.S;
    L = instance.parameters.L;
    C = instance.parameters.C;
	
	local name = profile:id() .. "(" .. source:name() .. "," .. C .. "," .. S .. "," .. L .. ")";
    instance:name(name);
	
	if   (nameOnly) then
        return;
    end
	

    assert(S < L, "Short Period Length must be less than Long Period Length");
    assert(C < L, "Cycle Periods must be less than Long Period Length");

    wmas = core.indicators:create("WMA", source, S);
    wmal = core.indicators:create("WMA", source, L);

    firstmcd = wmal.DATA:first();
    mcd = instance:addInternalStream(firstmcd, 0);
    firstst = firstmcd + C;
    st = instance:addInternalStream(firstst, 0);

    wmast = core.indicators:create("WMA", st, C / 2);
    first = wmast.DATA:first();


    out = instance:addStream("SCHTC", core.Line, name, "SCHTC", instance.parameters.clrUp,  first)
	out:addLevel(OB, instance.parameters.level_overboughtsold_style, instance.parameters.level_overboughtsold_width, instance.parameters.level_overboughtsold_color);
	out:addLevel(OS, instance.parameters.level_overboughtsold_style, instance.parameters.level_overboughtsold_width, instance.parameters.level_overboughtsold_color);    
	out:addLevel(0, instance.parameters.level_overboughtsold_style, instance.parameters.level_overboughtsold_width, instance.parameters.level_overboughtsold_color);    
	out:addLevel(100, instance.parameters.level_overboughtsold_style, instance.parameters.level_overboughtsold_width, instance.parameters.level_overboughtsold_color);	
	out:setPrecision (2);	
	out:setWidth(instance.parameters.width);
    out:setStyle(instance.parameters.style);   
   
	
	Initialization();
end


function  Initialization ()
     Size=instance.parameters.Size;
	 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;
	
		if ON[i] then
		up[i] = instance:createTextOutput ("Up", "Up", "Wingdings", Size, core.H_Center, core.V_Center, instance.parameters.Up, 0);
		down[i] = instance:createTextOutput ("Dn", "Dn", "Wingdings", Size, core.H_Center, core.V_Center, instance.parameters.Down, 0);
		end
	end
		
	

	
end	


 

-- calculate the value
function Update(period, mode)

    wmas:update(mode);
    wmal:update(mode);
	
    if (period < firstmcd) then
	return;
	end
      
        mcd[period] = wmas.DATA[period] - wmal.DATA[period];
  
    if (period < firstst) then
	return;
	end
	
        local lookback = core.rangeTo(period, C);
        local max = core.max(mcd, lookback);
        local min = core.min(mcd, lookback);
        st[period] = (mcd[period] - min) / (max - min) * 100;
 
        wmast:update(mode);
	if (period < first) then	
	return;
	end
        out[period] = wmast.DATA[period];
		if out[period] > out[period-1] then
		out:setColor(period,  instance.parameters.clrUp);
		else
		out:setColor(period,  instance.parameters.clrDown);
        end
		
		
			
	local i;
	for i = 1, Number , 1 do
		  if ON[i] then
		 down[i]:setNoData (period); 
		 up[i]:setNoData (period);
		 end
   end	 
   
 
    Activate (1, period);
	Activate (2, period);
	Activate (3, period);
	 
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 out[period] > 50
			and out[period-1] <= 50
			then
			           
						     up[id]:set(period , 50, "\108");	
						   
			
			 D[id] = nil;
						   
							  if U[id]~=source:serial(period) 
							  and period == source:size()-1-Shift
							  and not FIRST 
							  then
							  U[id]=source:serial(period);
							  SoundAlert(Up[id]);
							  EmailAlert(  Label[id], " Cross Over", period);
							    
							        if Show then
									Pop(Label[id], " Cross Over " );  	
								    end
								 
							  end
			elseif  out[period] < 50
			and out[period-1] >= 50
            then			
			
			            			 
			               down[id]:set(period , 50, "\108");	  						   
						   
		     U[id] = nil;
		   
			                 if  D[id]~=source:serial(period)
							 and period == source:size()-1-Shift
							 and not FIRST 
							 then
							 D[id]=source:serial(period);
							 SoundAlert(Down[id]);			 
							 EmailAlert( Label[id] , " Cross Under", period);	
								 if Show then
									Pop(Label[id], " Cross Under " );  	
								 end
							 
			                  end			   
	         end
			
	  
	 
	  end
	  
	    if id == 2  and ON[id]  then
	  
	       
			if out[period] > OB
			and out[period-1] <= OB
			then
			           
						     up[id]:set(period , OB, "\108");	
						   
			
			 D[id] = nil;
						   
							  if U[id]~=source:serial(period) 
							  and period == source:size()-1-Shift
							  and not FIRST 
							  then
							  U[id]=source:serial(period);
							  SoundAlert(Up[id]);
							  EmailAlert(  Label[id], " Cross Over", period);
							    
							        if Show then
									Pop(Label[id], " Cross Over " );  	
								    end
								 
							  end
			elseif  out[period] < OB
			and out[period-1] >= OB
            then			
			
			            			 
			               down[id]:set(period , OB, "\108");	  						   
						   
		     U[id] = nil;
		   
			                 if  D[id]~=source:serial(period)
							 and period == source:size()-1-Shift
							 and not FIRST 
							 then
							 D[id]=source:serial(period);
							 SoundAlert(Down[id]);			 
							 EmailAlert( Label[id] , " Cross Under", period);	
								 if Show then
									Pop(Label[id], " Cross Under " );  	
								 end
							 
			                  end			   
	         end
			
	  
	 
	  end
	  
	  
	  
	    if id == 3  and ON[id]  then
	  
	       
			if out[period] > OS
			and out[period-1] <= OS
			then
			           
						     up[id]:set(period , OS, "\108");	
						   
			
			 D[id] = nil;
						   
							  if U[id]~=source:serial(period) 
							  and period == source:size()-1-Shift
							  and not FIRST 
							  then
							  U[id]=source:serial(period);
							  SoundAlert(Up[id]);
							  EmailAlert(  Label[id], " Cross Over", period);
							    
							        if Show then
									Pop(Label[id], " Cross Over " );  	
								    end
								 
							  end
			elseif  out[period] < OS
			and out[period-1] >= OS
            then			
			
			            			 
			               down[id]:set(period , OS, "\108");	  						   
						   
		     U[id] = nil;
		   
			                 if  D[id]~=source:serial(period)
							 and period == source:size()-1-Shift
							 and not FIRST 
							 then
							 D[id]=source:serial(period);
							 SoundAlert(Down[id]);			 
							 EmailAlert( Label[id] , " Cross Under", period);	
								 if Show then
									Pop(Label[id], " Cross Under " );  	
								 end
							 
			                  end			   
	         end
			
	  
	 
	  end
	  
		   
        if FIRST then
        FIRST=false;      
        end		

end


function AsyncOperationFinished (cookie, success, message)
end


function Pop(label , note)

   core.host:execute ("prompt", 1, label ,
   " ( " .. source:instrument() .. " ) "  ..   label .. " : " .. note );


end

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

 
  terminal:alertSound(Sound, RecurrentSound);
end




function EmailAlert( label , Subject, period)

if not SendEmail 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 text = Note  .. delim ..  Symbol .. delim .. Time;
	

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