-- Available @ https://fxcodebase.com/code/viewtopic.php?f=17&t=73281

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--|                                                        https://AppliedMachineLearning.systems  |
--|                                                                       https://mario-jemic.com/ |
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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("Period1", "Period", "", 14, 1, 2000); 
    indicator.parameters:addInteger("Period2", "Range", "", 28, 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 Period1,Period2;  
	
-- Routine
 function Prepare(nameOnly)   
 
    
	Period1=instance.parameters.Period1;
	Period2=instance.parameters.Period2;
	source = instance.source
 
    local name = profile:id() .. "(" ..  instance.source:name().. "," ..  Period1.. "," ..  Period2    .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end
	
 
	first=source:first()+Period2 ; 
	
 
 
    BOP = instance:addStream("BOP", core.Bar, name, "BOP", instance.parameters.Up, first+Period1 );
    BOP:setPrecision(math.max(2, instance.source:getPrecision()));	
 
end


function Update(period, mode)

	--  Indicator:update(mode); 

	if period <= first then
	return;
	end
	 
    local min,max = mathex.minmax(source, period-Period2+1, period);
    
 
   
 
	if period <= first+Period2 then
	return;
	end	
    
	
	BOP[period]=(source.close[period]-source.open[period-Period1+1])/(max-min);
	if (source.close[period]>min+(max-min)/2.0) then
    BOP:setColor(period,  instance.parameters.Up);		
    else
    BOP:setColor(period,  instance.parameters.Down);			
    end	
end
 
 
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--|                                                                    We appreciate your support. | 
--+------------------------------------------------------------------------------------------------+
--|                                                               Paypal: https://goo.gl/9Rj74e    |
--|                                                             Patreon :  https://goo.gl/GdXWeN   |  
--+------------------------------------------------------------------------------------------------+
--|                                                                   Developed by : Mario Jemic   |                    
--|                                                                       mario.jemic@gmail.com    |
--|                                                        https://AppliedMachineLearning.systems  |
--|                                                                       https://mario-jemic.com/ |
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