-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=72351

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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("Balance of Power");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);

  
 	indicator.parameters:addGroup("Calculation");	
    indicator.parameters:addInteger("Period", "Period", "", 5, 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, 0, 255)); 
	indicator.parameters:addColor("Up", "Up Color", "", core.rgb(0, 255, 0)); 
	indicator.parameters:addColor("Down", "Down Color", "", core.rgb(255, 0, 0)); 
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
	
	--Indicator= core.indicators:create("AO", source, Period1, Period2);
	first=source:first() ; 
	
	
	--Stream = instance:addInternalStream(0, 0);
 
    BOP = instance:addStream("BOP", core.Bar, name, "BOP", instance.parameters.Up, first );
    BOP:setPrecision(math.max(2, instance.source:getPrecision()));	
	
    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


function Update(period, mode)

	--  Indicator:update(mode); 

	if period <= first then
	return;
	end
	 
    local trhi = math.max(source.high[period], source.close[period-1]);
    local trlo = math.min(source.low[period], source.close[period-1]);

 
    local trop = source.close[period-1];
    BOP[period] = 100*(source.close[period]-trop)/(trhi-trlo); --True Balance of Power as percent
     
	if BOP[period]> 0 then
    BOP:setColor(period,  instance.parameters.Up);	
	else
    BOP:setColor(period,  instance.parameters.Down);	
	end

	if period <= first+Period then
	return;
	end
   Line[period]=  1.5*mathex.lreg (BOP, period-Period+1, period); --linear regression as emoline
   
 
	
 
	
end