-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=73254

--+------------------------------------------------------------------------------------------------+
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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("Fair Value Gap Oscillator");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);
	
	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:addColor("Neutral", "Neutral color", "", core.rgb(0, 0, 255));
    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);	
   
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  Line=nil; 
local first;

 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;
    Neutral= instance.parameters.Neutral;
   
  
	

	source = instance.source;   
	first= source:first();

    Line = instance:addStream("Line", core.Line, name, "Line", instance.parameters.Up, first );
    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)
 
	
	if period <= first 
	or not source:hasData(period)
	then
	Line:setColor(period, Neutral);	
	end
   
   
    local bullishFvg=false;
    local bearishFvg=false;
   
    if (source.close[period] > source.high[period-1]) then
    bullishFvg=true;
    end
    if(source.close[period] < source.low[period-1])then
    bearishFvg=true;  
    end
	
   Line[period]= Line[period-1] 
	
	if(bullishFvg) then
        if(Line[period] < 0)  then
           Line[period]= 1
		else
        Line[period]= Line[period-1] + 1		
		end    
	end
	
    if(bearishFvg) then
        if(Line[period] > 0)  then
           Line[period]= -1
		else
		    Line[period]= Line[period-1] - 1
        end		
    end



	
 	if Line[period]> 0 then
	    Line:setColor(period,  Up); 
 	elseif Line[period]< 0 then	
	    Line:setColor(period,  Down); 
	else
	    Line:setColor(period, Neutral);		
	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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--+------------------------------------------------------------------------------------------------+