-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=72624

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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("Difference of Two Normalized Moving Average Differences");
    indicator:description("");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);

  
 	indicator.parameters:addGroup("Calculation");	
    indicator.parameters:addInteger("Period1", "1. MA Period", "", 14, 1, 2000);
    indicator.parameters:addInteger("Period2", "2. MA Period", "", 33, 1, 2000);
    indicator.parameters:addInteger("Period3", "3. MA Period", "", 50, 1, 2000);
 	
	
	 indicator.parameters:addGroup("Line Style");	
    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:addColor("color", "Line Color", "", core.rgb(0, 0, 255)); 

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 first;
local source = nil;
local Period1, Period2, Period3; 
local Ratio1,Ratio2; 
	
-- Routine
 function Prepare(nameOnly)   
 
    
	Period1=instance.parameters.Period1;
	Period2=instance.parameters.Period2;
	Period3=instance.parameters.Period3;	
	source = instance.source
	
	Ratio1=math.abs(Period2/Period1);
	Ratio2=math.abs(Period3/Period2);
 
    local name = profile:id() .. "(" ..  instance.source:name().. "," ..  Period1.. "," ..  Period2 .. "," ..  Period3 .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end
	
	Indicator1= core.indicators:create("MVA", source, Period1 );
	Indicator2= core.indicators:create("MVA", source, Period2 );
	Indicator3= core.indicators:create("MVA", source, Period3 );	
	first=math.max(Indicator1.DATA:first(),Indicator2.DATA:first(),Indicator3.DATA:first()) ; 
	
	
	--Source1 = instance:addInternalStream(0, 0);
 	 
	
    Line = instance:addStream("Line", core.Line, name, "Line", instance.parameters.color, first );
    Line:setPrecision(math.max(2, instance.source:getPrecision()));
    Line:setWidth(instance.parameters.width);
    Line:setStyle(instance.parameters.style);
    Line:addLevel(0);	
 
end


function Update(period, mode)

	  Indicator1:update(mode); 
	  Indicator2:update(mode); 
	  Indicator3:update(mode); 
	  
	 if period <= first then
	 return;
	 end
	 
	 local Source1;
	 local Source2;
	 
	if Ratio1 < Ratio2 then
    Source1 =(Indicator2.DATA[period]-Indicator1.DATA[period])*(Ratio2/Ratio1);
	Source2=(Indicator3.DATA[period]-Indicator2.DATA[period]);
	else
    Source1 =(Indicator2.DATA[period]-Indicator1.DATA[period]);	
    Source2=(Indicator3.DATA[period]-Indicator2.DATA[period])*(Ratio1/Ratio2);
    end
	
	
	Line[period]= Source2-Source1;
 
	
end