-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=71971

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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("Extended OBV");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);

  
 	indicator.parameters:addGroup("Calculation");	
    indicator.parameters:addInteger("Period", "Period", "", 50, 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("color1", "Top Line Color", "", core.rgb(0, 255, 0)); 
	indicator.parameters:addColor("color2", "Bottom Line 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;  
	
-- 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
	
 
	first=source:first()+1 ; 
	
 
	
	
    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);	
	
	
    Max = instance:addStream("Max", core.Line, name, "Max", instance.parameters.color1, first+Period );
    Max:setPrecision(math.max(2, instance.source:getPrecision()));
    Max:setWidth(instance.parameters.width);
    Max:setStyle(instance.parameters.style);
    Max:addLevel(0);	


    Min = instance:addStream("Min", core.Line, name, "Min", instance.parameters.color2, first+Period );
    Min:setPrecision(math.max(2, instance.source:getPrecision()));
    Min:setWidth(instance.parameters.width);
    Min:setStyle(instance.parameters.style);
    Min:addLevel(0);		
	
	
    Top = instance:addStream("Top", core.Line, name, "Top", instance.parameters.color1, first+Period );
    Top:setPrecision(math.max(2, instance.source:getPrecision()));
    Top:setWidth(instance.parameters.width);
    Top:setStyle(instance.parameters.style);
    Top:addLevel(0);	


    Bottom = instance:addStream("Bottom", core.Line, name, "Bottom", instance.parameters.color2, first+Period );
    Bottom:setPrecision(math.max(2, instance.source:getPrecision()));
    Bottom:setWidth(instance.parameters.width);
    Bottom:setStyle(instance.parameters.style);
    Bottom:addLevel(0);		
 
end


function Update(period, mode)

 

	 if period < first  then
	 return;
	 end
	 
     if (source.close[period]>source.close[period-1]) then
	 Line[period]=Line[period-1]+source.volume[period]; 
	 elseif (source.close[period]<source.close[period-1])  then
	 Line[period]=Line[period-1]-source.volume[period]; 
	 else
	 Line[period]=Line[period-1]; 
	 end
	 
	
	 if period <= first+Period  then
	 return;
	 end
	 
	local min, max=mathex.minmax(Line , period-Period+1, period);
	Max[period]=max;
	Min[period]=min;
	
	Top[period] = Max[period]-(Max[period]-Min[period])/5.0;
    Bottom[period] = Min[period]+(Max[period]-Min[period])/5.0;
	
end