-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=72139

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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("ATR adaptive SMA");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);

  
 	indicator.parameters:addGroup("Calculation");	
    indicator.parameters:addInteger("Period", "Period", "",25, 1, 2000);
	
    indicator.parameters:addString("Price", "Price 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: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 Period; 
local ATR;
	
-- Routine
 function Prepare(nameOnly)   
 
    
	Period=instance.parameters.Period;
	Price=instance.parameters.Price;

	source = instance.source
 
    local name = profile:id() .. "(" ..  instance.source:name().. "," ..  Period .. "," ..  Price .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end
	
	ATR= core.indicators:create("ATR", source, Period); 
	first=ATR.DATA:first() ; 
	
	
	Stream = 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)

	  ATR:update(mode);  
	  
	 if period <= first+Period then
	 return;
	 end
	 
	 
	local min,max=mathex.minmax(ATR.DATA, period-Period+1, period); 
	
	  --       double _max   = m_work[r].max > atr[i] ? m_work[r].max : atr[i];   
    
	if max > ATR.DATA[period] then
	Max=max 
	else
	Max=ATR.DATA[period]
	end
	
	if min < ATR.DATA[period] then
	Min=min 
	else
	Min=ATR.DATA[period]
	end
	
	  
    
    
    
     local Coeff;
	 if(Min~=Max) then
	 Coeff =  1-(ATR.DATA[period]-Min)/(Max-Min); 
	 else
	 Coeff =  0.5;
	 end
	 
	local PERIOD =  Period*(Coeff+1.0)/2.0;
	
	 if period <= first+Period+PERIOD then
	 return;
	 end
	 
	  

	
	Line[period]= mathex.avg(source[Price], period-PERIOD+1, period);
	
end