-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=72959

--+------------------------------------------------------------------------------------------------+
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--|                                                                         http://fxcodebase.com  |
--+------------------------------------------------------------------------------------------------+
--|                                                                   Developed by : Mario Jemic   |                    
--|                                                                       mario.jemic@gmail.com    |
--|                                                        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("Volume Price Analysis Overlay");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);

	 indicator.parameters:addGroup("Calcation");	
 	 indicator.parameters:addInteger("Period", "Period", "", 14, 1, 1000);
     indicator.parameters:addBoolean("CurrentCandle", "Current candle", "", false);	 
	 
	 indicator.parameters:addGroup("Style");	
 	 indicator.parameters:addColor("U", "Strong Up Color", "", core.rgb(0, 255, 0)); 
 	 indicator.parameters:addColor("WU", "Weak Up Color", "", core.rgb(0, 100, 0))
 	 indicator.parameters:addColor("D", "Strong Down Color", "", core.rgb(255, 0, 0)); 
 	 indicator.parameters:addColor("WD", "Weak 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 CurrentCandle,Period, Shift; 
 

local  open=nil;
local  close=nil;
local  high=nil;
local  low=nil;
  
 function Prepare(nameOnly)   
 
 
 
    Period=instance.parameters.Period;
	CurrentCandle=instance.parameters.CurrentCandle;
 
    local name = profile:id() .. "(" ..  instance.source:name() .. ", " .. Period  .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end
 
	 

	source = instance.source;
	
	if CurrentCandle then
	first=source:first()+Period;		
	Shift=0;
	else
	first=source:first()+Period+1;	
	Shift=1;
	end
	

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

-- Indicator calculation routine
function Update(period, mode)
	
    open[period] = source.open[period];
	close[period] = source.close[period];
	high[period] = source.high[period];
	low[period] = source.low[period];
	
			if period <= first then
			open:setColor(period, core.rgb(128, 128, 128));	
			return;
			end
	
 
        local MA=mathex.avg(source.volume, period-Shift-Period+1, period-Shift);
		
		
 
		if source.close[period]> source.open[period] then	 
			if source.volume[period]>= MA then
			open:setColor(period,instance.parameters.U);	   
			else
			open:setColor(period,instance.parameters.WU);
			end		
		else	
			if source.volume[period]>= MA then
			open:setColor(period,instance.parameters.D);	   
			else
			open:setColor(period,instance.parameters.WD);
			end		
		end
    
 
	 
		
 end
 
--+------------------------------------------------------------------------------------------------+
--|                                                                    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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--+------------------------------------------------------------------------------------------------+