-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=72031

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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("Heiken Ashi Histogram");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);

	
	indicator.parameters:addGroup("Calculation");
	 indicator.parameters:addInteger("Period", "Period", "", 6, 1, 1000);

	
	indicator.parameters:addGroup("Style");
	indicator.parameters:addColor("Up", "Up color", "", core.rgb(0, 255, 0));
	indicator.parameters:addColor("Down", "Down color", "", core.rgb(255, 0, 0)); 
	
 	 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 Up,Down, Neutral;
local first;
local source = nil;
 
local  open=nil;
local  close=nil;
local  high=nil;
local  low=nil; 

 

 function Prepare(nameOnly)   
 
    local name = profile:id() .. "(" ..  instance.source:name()  .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end


    Up = instance.parameters.Up;
    Down= instance.parameters.Down; 
   
    
	Period= instance.parameters.Period;
	
	 
    Median = instance:addInternalStream(0, 0);
    Difference = instance:addInternalStream(0, 0);	

	source = instance.source;
	HA=core.indicators:create("HA",  source ); 
	first=HA.DATA:first();

    	
	open = instance:addStream("openup", core.Line, name, "", core.rgb(0, 0, 0), first);
    high = instance:addStream("highup", core.Line, name, "", core.rgb(0, 0, 0), first);
    low = instance:addStream("lowup", core.Line, name, "", core.rgb(0, 0, 0), first);
    close = instance:addStream("closeup", core.Line, name, "", core.rgb(0, 0, 0), first);
    instance:createCandleGroup("OVERLAY", "OVERLAY", open, high, low, close);
	

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

-- Indicator calculation routine
function Update(period, mode)
	 
	
			   HA:update(mode)	
	
			if period <= first then
			open:setColor(period, Neutral);	
			return;
			end
	
 
		 
    Median[period]=  (HA.open[period] + HA.close[period]) / 2; 
	Difference[period]= math.abs(Median[period] - Median[period-1]);
	
	local H=math.abs(HA.high[period]- math.max(HA.open[period], HA.close[period]));
	local L=math.abs( math.min(HA.open[period], HA.close[period])-HA.low[period]);
  
  
    if(HA.close[period] > HA.open[period]) then
         close[period] = Difference[period];
         open[period] = 0;
         high[period] = Difference[period]+H;
         low[period] = 0-L;        
  	     open:setColor(period,  Up); 
    else 
         close[period] = 0;
         open[period] = Difference[period];
		 high[period] = Difference[period]+H;
         low[period] = 0-L;  
	     open:setColor(period,  Down);  	 
    end
	 
	 
	if period <= first+Period then
	return;
	end
    Line[period]= mathex.avg(Difference, period-Period+1, period); 
		
 end