-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=72254

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-- Indicator profile initialization routine

function Init()
    indicator:name("Simple-trend-detector");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);
	
	indicator.parameters:addGroup("Calculation"); 
    indicator.parameters:addInteger("STDPeriod", "STDPeriod", "", 15, 1, 2000);
 
 
	indicator.parameters:addGroup("Style"); 	
    indicator.parameters:addColor("color", "Line Color", "", core.rgb(255, 0, 0));
	indicator.parameters:addInteger("style", "Line Style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style", core.FLAG_LEVEL_STYLE);	
	indicator.parameters:addInteger("width", "Line Width", "", 3, 1, 5);
	
    indicator.parameters:addGroup("Levels");	
    indicator.parameters:addDouble("Level1", "1. Level","", 0.3);
	indicator.parameters:addDouble("Level2", "2. Level","", 0.7);
 
	indicator.parameters:addColor("level_overboughtsold_color", "Line Color","", core.rgb(128, 128, 128));
    indicator.parameters:addInteger("level_overboughtsold_width","Line width","", 1, 1, 5);
    indicator.parameters:addInteger("level_overboughtsold_style", "Line Style","", core.LINE_SOLID);
    indicator.parameters:setFlag("level_overboughtsold_style", core.FLAG_LEVEL_STYLE);		
	
	

	
end

-- Indicator instance initialization routine
-- Processes indicator parameters and creates output streams
-- Parameters block

local STDPeriod; 
local first;
local source = nil;
 
local Oscillator;  
local Indicator={};

-- Routine
 function Prepare(nameOnly)   
 
 
 
 
 
    STDPeriod = instance.parameters.STDPeriod;
	
	
	local Parameters= STDPeriod;
 
    local name = profile:id() .. "(" ..  instance.source:name()  .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end

    
	PosBuffer = instance:addInternalStream(0, 0);
	NegBuffer = instance:addInternalStream(0, 0);
	
    source = instance.source; 
    first=source:first()+STDPeriod;
	
	 
   
 
	Oscillator = instance:addStream("Oscillator" , core.Line, " Oscillator"," Oscillator",instance.parameters.color, first);
	Oscillator:setWidth(instance.parameters.width);
    Oscillator:setStyle(instance.parameters.style);
    Oscillator:setPrecision(math.max(2, source:getPrecision()));
	Oscillator:addLevel(instance.parameters.Level1, instance.parameters.level_overboughtsold_style, instance.parameters.level_overboughtsold_width, instance.parameters.level_overboughtsold_color);	
	Oscillator:addLevel(instance.parameters.Level2, instance.parameters.level_overboughtsold_style, instance.parameters.level_overboughtsold_width, instance.parameters.level_overboughtsold_color);	
end

-- Indicator calculation routine
function Update(period, mode)
 
	
	
    if period <= first then
	return;
	end
	
	if source.close[period]> source.open[period] then
	PosBuffer[period]=math.abs(source.close[period]-source.open[period]);
	NegBuffer[period]=0;
	else
	NegBuffer[period]=math.abs(source.close[period]-source.open[period]);
	PosBuffer[period]=0;
	end
	
	
	local positive = 0.0; 
	local negative = 0.0;  
    
	local j;
	local Norm;
	
      for j = 0, STDPeriod , 1 do
         Norm = STDPeriod - j + 1;
         positive  = positive + Norm * PosBuffer[period-j];
         negative  = negative + Norm * NegBuffer[period-j]; 
	  end
    
    local Den = positive + negative;
     
 
	 if(Den == 0.0) then 	
     Oscillator[period]=1;
	 else
	 Oscillator[period]=positive / Den;
	 end
				  
end