-- Available @ https://fxcodebase.com/code/viewtopic.php?f=17&t=74838

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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("The Ultimate Smoother");
    indicator:description("");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Indicator);

  
 	indicator.parameters:addGroup("Calculation");	
 
    indicator.parameters:addInteger("Period", "Period", "", 20, 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, 255, 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 Indicator;
	
-- Routine
 function Prepare(nameOnly)   
 
    
	Period=instance.parameters.Period;
	source = instance.source
 
    local name = profile:id() .. "(" ..  instance.source:name().. "," ..  Period  .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end
	
    a1 = math.exp(-1.414 * math.pi / Period)
    c2 = 2.0 * a1 * math.cos(1.414 * math.pi / Period)
    c3 = -a1 * a1
    c1 = (1.0 + c2 - c3) / 4.0
 
	first=source:first()+2 ; 
	
	 
	
    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)

	--Indicator:update(mode); 

	if period <= first
	or  not source:hasData(period) 
	then
	Line[period]=source[period];
	return;
	end
	 
 	
	Line[period]= (1.0 - c1) * source[period] + 
              (2.0 * c1 - c2) * source[period-1] - 
              (c1 + c3) * source[period-2] + 
              c2 * Line[period-1] + c3 * Line[period-2]
 
end
 

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