-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=68630
 
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-- Indicator profile initialization routine

function Init()
    indicator:name("Bollinger bands Normalized RSI");
    indicator:description("");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);
	
	indicator.parameters:addGroup("Calculation"); 
    indicator.parameters:addInteger("Period1", "RSI Period", "", 14, 2, 2000);
    indicator.parameters:addInteger("Period2", "EMA Period", "", 14, 2, 2000);
 
 
	
	indicator.parameters:addGroup("Style"); 	
    indicator.parameters:addColor("color", "Line Color", "", core.rgb(255, 0, 0));
	indicator.parameters:addInteger("style", "Line Style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style", core.FLAG_LEVEL_STYLE);	
	indicator.parameters:addInteger("width", "Line Width", "", 3, 1, 5);
	
	
	
	indicator.parameters:addGroup("OB/OS Levels");	
    indicator.parameters:addDouble("overbought", "Overbought Level","", 0.8);
    indicator.parameters:addDouble("oversold","Oversold Level","", 0.2);
	indicator.parameters:addColor("level_overboughtsold_color", "Line Color","", core.rgb(128, 128, 128));
    indicator.parameters:addInteger("level_overboughtsold_width","Line width","", 1, 1, 5);
    indicator.parameters:addInteger("level_overboughtsold_style", "Line Style","", core.LINE_SOLID);
    indicator.parameters:setFlag("level_overboughtsold_style", core.FLAG_LEVEL_STYLE);
	
end

-- Indicator instance initialization routine
-- Processes indicator parameters and creates output streams
-- Parameters block

 
local Period1,Period2 ; 
local first;
local source = nil;
 
local Oscillator;   
local RSI,EMA; 
-- Routine
 function Prepare(nameOnly)   
 
 
    Period1= instance.parameters.Period1;
    Period2= instance.parameters.Period2; 
	
	
	local Parameters= Period1..", "..Period2;
 
    local name = profile:id() .. "(" ..  instance.source:name() ..  ", " ..  Parameters .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end

    
			
    source = instance.source; 
	
	RSI = core.indicators:create("RSI", source,Period1);
	EMA = core.indicators:create("EMA", RSI.DATA,Period2);
    first=EMA.DATA:first();
	
 
 
	Oscillator = instance:addStream("Oscillator" , core.Line, " Oscillator"," Oscillator",instance.parameters.color, first );
	Oscillator:setWidth(instance.parameters.width);
    Oscillator:setStyle(instance.parameters.style);
    Oscillator:setPrecision(math.max(2, source:getPrecision()));
	Oscillator:addLevel(instance.parameters.oversold, instance.parameters.level_overboughtsold_style, instance.parameters.level_overboughtsold_width, instance.parameters.level_overboughtsold_color);
	Oscillator:addLevel(instance.parameters.overbought, instance.parameters.level_overboughtsold_style, instance.parameters.level_overboughtsold_width, instance.parameters.level_overboughtsold_color);    
	
end

-- Indicator calculation routine
function Update(period, mode)

    RSI:update(mode);
	EMA:update(mode);
	
	if period < first 
	then
	return;
	end
	
	local STD=mathex.stdev(RSI.DATA, period-Period2+1, period);
    local Top=EMA.DATA[period]+2*STD;
	local Bottom=EMA.DATA[period]-2*STD;
	
     Oscillator[period]= (RSI.DATA[period] - Bottom) / (Top - Bottom);
				  
end