-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=71890

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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("Forex Trade");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);

  
 	indicator.parameters:addGroup("Calculation");	
    indicator.parameters:addInteger("nPeriod", "nPeriod", "", 9, 1, 2000);
    indicator.parameters:addDouble("factor_1", "factor_1 MA", "", 0.6666666, 0, 2000);
    indicator.parameters:addDouble("factor_2", "factor_2", "", 0.3333333 , 0, 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("color1", "1. Line Color", "", core.rgb(0, 255, 0)); 
	indicator.parameters:addColor("color2", "2. Line Color", "", core.rgb(255, 0, 0)); 
	indicator.parameters:addColor("color3", "3. 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 nPeriod, factor_1,factor_2; 
local Indicator;
	
-- Routine
 function Prepare(nameOnly)   
 
    
	nPeriod=instance.parameters.nPeriod;
	factor_1=instance.parameters.factor_1;
	factor_2=instance.parameters.factor_2;	
	source = instance.source
 
    local name = profile:id() .. "(" ..  instance.source:name().. "," ..  nPeriod.. "," ..  factor_1 .. "," ..  factor_2 .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end
	
 
	first=source:first()+nPeriod ; 
	
 
	
	
    Line1 = instance:addStream("Line1", core.Line, name, "1. Line", instance.parameters.color1, first );
    Line1:setPrecision(math.max(2, instance.source:getPrecision()));
    Line1:setWidth(instance.parameters.width);
    Line1:setStyle(instance.parameters.style);
    Line1:addLevel(0);	
 
    Line2 = instance:addStream("Line2", core.Line, name, "2. Line", instance.parameters.color2, first );
    Line2:setPrecision(math.max(2, instance.source:getPrecision()));
    Line2:setWidth(instance.parameters.width);
    Line2:setStyle(instance.parameters.style);
    Line2:addLevel(0);	

    Line3 = instance:addStream("Line3", core.Line, name, "3. Line", instance.parameters.color3, first );
    Line3:setPrecision(math.max(2, instance.source:getPrecision()));
    Line3:setWidth(instance.parameters.width);
    Line3:setStyle(instance.parameters.style);
    Line3:addLevel(0);		
end


function Update(period, mode)

  
	 if period <=first then
	 return;
	 end
	 
	 local min,max=mathex.minmax(source, period-nPeriod+1, period);
	 
 

         if (max-min ~= 0) then RSV = (source.close[period]-min)/(max-min)*100; else RSV = 50; end
		 
		 

         if (period == first) then
            Line1[period] = factor_1 * 50 + factor_2 * RSV;
            Line2[period] = factor_1 * 50 + factor_2 * Line1[period];
         else  
            Line1[period] = factor_1 * Line1[period-1] + factor_2 * RSV;
            Line2[period] = factor_1 * Line2[period-1] + factor_2 * Line1[period];
         end
		 
         Line3[period] = 3 * Line2[period] - 2 * Line1[period];
	 
end