-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=66700

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-- Indicator profile initialization routine
-- Defines indicator profile properties and indicator parameters
-- TODO: Add minimal and maximal value of numeric parameters and default color of the streams
function Init()
    indicator:name("MACD Slow Stochastic Overlay");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);

	
	indicator.parameters:addGroup("MACD Calculation");
	indicator.parameters:addString("TF1", "Time frame", "", "Chart");
	indicator.parameters:addString("Price" , "Data Source", "", "close");
    indicator.parameters:addStringAlternative("Price" , "Open", "", "open");
    indicator.parameters:addStringAlternative("Price", "High", "", "high");
    indicator.parameters:addStringAlternative("Price" , "Low", "", "low");
	indicator.parameters:addStringAlternative("Price" , "Close", "", "close");
	indicator.parameters:addStringAlternative("Price", "Median", "", "median");
    indicator.parameters:addStringAlternative("Price" , "Typical", "", "typical");
	indicator.parameters:addStringAlternative("Price" , "Weighted ", "", "weighted");		
	
	indicator.parameters:addInteger("SN", "Short EMA", "", 12, 2, 1000);
    indicator.parameters:addInteger("LN", "Long EMA", "", 26, 2, 1000);
    indicator.parameters:addInteger("IN", "Signal Line", "", 9, 2, 1000);
	
    
	indicator.parameters:addGroup("Slow Stochastic Calculation");
	indicator.parameters:addString("TF2", "Time frame", "", "Chart");
	indicator.parameters:addInteger("K", "K Period", "", 5, 2, 1000);
    indicator.parameters:addInteger("SD", "K Slowing Period", "", 3, 2, 1000);
  --  indicator.parameters:addInteger("D", "D Period", "", 3, 2, 1000);
	
	indicator.parameters:addGroup("Selector"); 
	indicator.parameters:addBoolean("One", "Use MACD Filter", "", true);
	indicator.parameters:addBoolean("Two", "Use Stochastic Filter", "", true);
	 
	indicator.parameters:addGroup("Style");
	indicator.parameters:addColor("Up", "Up color", "", core.rgb(0, 255, 0));
	indicator.parameters:addColor("Down", "Down color", "", core.rgb(255, 0, 0));
	indicator.parameters:addColor("Neutral", "Neutral color", "", core.rgb(128, 128, 128));
	
   
end

-- Indicator instance initialization routine
-- Processes indicator parameters and creates output streams
-- TODO: Refine the first period calculation for each of the output streams.
-- TODO: Calculate all constants, create instances all subsequent indicators and load all required libraries
-- Parameters block

local Up,Down, Neutral;
local first;
local source = nil;


local K, SK, D, Stochastic;

local  open=nil;
local  close=nil;
local  high=nil;
local  low=nil;

local SN, LN, IN, Price;
 
local TF={};
local weekoffset, dayoffset;
 

local loading={};
local Source={}

local macd;

local One, Two ;


 function Prepare(nameOnly)   
 
    local name = profile:id() .. "(" ..  instance.source:name()  .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end


    Up = instance.parameters.Up;
    Down= instance.parameters.Down;
    Neutral= instance.parameters.Neutral;
	
	
	
	dayoffset = core.host:execute("getTradingDayOffset");
    weekoffset = core.host:execute("getTradingWeekOffset");
	
	 
    IN = instance.parameters.IN;
	SN = instance.parameters.SN;
    LN = instance.parameters.LN;
	Price = instance.parameters.Price;
	
	K= instance.parameters.K;
	SD= instance.parameters.SD;
	--D= instance.parameters.D;
	
	One= instance.parameters.One;
	Two= instance.parameters.Two; 
	
	if (LN <= SN) then
       error("The short EMA period must be smaller than long EMA period");
    end
	

	source = instance.source;
	first =  source:first();	
	TF[1]=instance.parameters.TF1; 
	
 
	if TF[1]=="Chart" then
	TF[1]=source:barSize();
	end
	
	
	TF[2]=instance.parameters.TF2; 
	
 
	if TF[2]=="Chart" then
	TF[2]=source:barSize();
	end
	
	
	if TF[1] ~= "Chart"then
	local s1, e1, s2, e2;
    s1, e1 = core.getcandle(source:barSize(),0, 0, 0);
    s2, e2 = core.getcandle(TF[1], 0, 0, 0);
    assert ((e1 - s1) <= (e2 - s2), "The chosen time frame must be equal to or bigger than the chart time frame!");
	end
	
	
	if TF[2] ~= "Chart"then
	local s1, e1, s2, e2;
    s1, e1 = core.getcandle(source:barSize(),0, 0, 0);
    s2, e2 = core.getcandle(TF[2], 0, 0, 0);
    assert ((e1 - s1) <= (e2 - s2), "The chosen time frame must be equal to or bigger than the chart time frame!");
	end
	
	if TF[1] ~= source:barSize() then 
    Source[1] = core.host:execute("getSyncHistory", source:instrument(), TF[1], source:isBid(), 0, 100, 101);
    loading[1]=true;
	
	macd = core.indicators:create("MACD", Source[1].close, SN,LN,IN);  	
	 
	
	else
	
	macd = core.indicators:create("MACD", source, SN,LN,IN);  	
	first = macd.HISTOGRAM:first();
	
	end
	
	
	if TF[2] ~= source:barSize() then 
    Source[2] = core.host:execute("getSyncHistory", source:instrument(), TF[2], source:isBid(), 0, 200, 201);
    loading[2]=true;
	
	Stochastic = core.indicators:create("SSD", Source[2], K,SD,3);
	 
	
	else
	
	Stochastic = core.indicators:create("SSD", source, K,SD,3);
	 first=math.max(first,Stochastic.D:first() );
	
	end

   
	  	
	
   

    	
	open = instance:addStream("openup", core.Line, name, "", core.rgb(0, 0, 0), first);
    high = instance:addStream("highup", core.Line, name, "", core.rgb(0, 0, 0), first);
    low = instance:addStream("lowup", core.Line, name, "", core.rgb(0, 0, 0), first);
    close = instance:addStream("closeup", core.Line, name, "", core.rgb(0, 0, 0), first);
    instance:createCandleGroup("OVERLAY", "OVERLAY", open, high, low, close);
		
end

-- Indicator calculation routine
function Update(period, mode)



    if loading[1] or loading[2] then
	return;
	end
	
    open[period] = source.open[period];
	close[period] = source.close[period];
	high[period] = source.high[period];
	low[period] = source.low[period];
	
			if period < first then
			open:setColor(period, Neutral);	
			return;
			end
	

  
	
		
    macd:update(mode); 
	Stochastic:update(mode); 
	
	if period <first then
	return;
	end
	
	local S1=0;
	local S2=0;
	
	 if TF[1] ~= "Chart" and  TF[1] ~=  source:barSize()  then
	 local p1 =  Initialization(1, period) 
     
        if not p1 then
        return;
        end
		
		
			 
		  if macd.HISTOGRAM[p1] > macd.HISTOGRAM[p1-1] then
		  S1=1;
          elseif macd.HISTOGRAM[p1] < macd.HISTOGRAM[p1-1] then
		  S1=-1;
          end		  
	 
	 else
	    
		
		 
			if macd.HISTOGRAM[period] > macd.HISTOGRAM[period-1] then
			S1=1;
            elseif macd.HISTOGRAM[period] < macd.HISTOGRAM[period-1] then
            S1=-1;
			end
			
	 end		
	 
	 
	 if TF[2] ~= "Chart" and  TF[2] ~=  source:barSize()  then
	 local p2 =  Initialization(2, period) 
     
        if not p2 then
        return;
        end
		
		
			 
		  if Stochastic.K[p2] >  Stochastic.K[p2-1] then
		  S2=1;
          elseif Stochastic.K[p2] <  Stochastic.K[p2-1] then
		  S2=-1;
          end		  
	 
	 else
	    
		
		 
			if Stochastic.K[period] >  Stochastic.K[period-1] then
			S2=1;
            elseif Stochastic.K[period] <  Stochastic.K[period-1] then
            S2=-1;
			end
			
	 end	
	 
	 
	     
 		
		
		 
		
		if ((S1 == 1 and One) or not One)
		and ((S2 == 1 and Two) or not Two)
		and (S1~=0 or S2~=0)
		then		
		open:setColor(period,  Up);
        elseif ((S1 == -1 and One) or not One)
		and ((S2 == -1 and Two) or not Two)
		and (S1~=0 or S2~=0)
		then
		open:setColor(period,  Down);
		else
		open:setColor(period, Neutral);			
		end
		
		
				

		
 end

-- the function is called when the async operation is finished
function AsyncOperationFinished(cookie)
    if cookie == 100 then
        loading[1] = false;
       
    elseif cookie == 101 then
        loading[1] = true;
    end
	
	if cookie == 200 then
        loading[2] = false;
       
    elseif cookie == 201 then
        loading[2] = true;
    end
	
	 if not loading1 and not loading2 then
	 instance:updateFrom(0);
	 end
end


function   Initialization(id, period)

    local Candle;
    Candle = core.getcandle(TF[id], source:date(period), dayoffset, weekoffset);

  
    if loading[id] or Source[id]:size() == 0 then
        return false ;
    end

    
    if period < source:first() then
        return false;
    end

    local p = core.findDate(Source[id], Candle, false);

    -- candle is not found
    if p < 0 then
        return false;
    else return p;    
    end
    
end