-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=68888

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-- Indicator profile initialization routine

function Init()
    indicator:name("Modified RSI");
    indicator:description("");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);
	
	indicator.parameters:addGroup("Calculation"); 
    indicator.parameters:addInteger("Period1", "1. Period", "", 14, 1, 2000);
	 indicator.parameters:addInteger("Period2", "2. Period", "", 1, 1, 2000);
	
	indicator.parameters:addString("Method", "MA Method", "Method" , "SMMA");
    indicator.parameters:addStringAlternative("Method", "MVA", "MVA" , "MVA");
    indicator.parameters:addStringAlternative("Method", "EMA", "EMA" , "EMA");
   indicator.parameters:addStringAlternative("Method", "LWMA", "LWMA" , "LWMA");
    indicator.parameters:addStringAlternative("Method", "TMA", "TMA" , "TMA");
    indicator.parameters:addStringAlternative("Method", "SMMA", "SMMA" , "SMMA");
    indicator.parameters:addStringAlternative("Method", "KAMA", "KAMA" , "KAMA");
    indicator.parameters:addStringAlternative("Method", "VIDYA", "VIDYA" , "VIDYA");
    indicator.parameters:addStringAlternative("Method", "WMA", "WMA" , "WMA");
 
	
	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","", 70);
    indicator.parameters:addDouble("oversold","Oversold Level","", 30);
	    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 Method;
local Oscillator;  
local Positive, Negative;
local MA1, MA2;
-- Routine
 function Prepare(nameOnly)   
 
 
    Period1= instance.parameters.Period1; 
	Period2= instance.parameters.Period2;
	Method= instance.parameters.Method;
	
	
	local Parameters= Period1.. "," ..  Period2 .. "," ..  Method ;
 
    local name = profile:id() .. "(" ..  instance.source:name() ..  ", " ..  Parameters .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end

    
			
    source = instance.source; 
    
	
	Positive= instance:addInternalStream(0, 0);
	Negative= instance:addInternalStream(0, 0);
	
	MA1 = core.indicators:create(Method, Positive, Period1);
	MA2 = core.indicators:create(Method, Negative, Period1);
	first=MA1.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); 
	Oscillator:addLevel(100, instance.parameters.level_overboughtsold_style, instance.parameters.level_overboughtsold_width, instance.parameters.level_overboughtsold_color);
	Oscillator:addLevel(0, instance.parameters.level_overboughtsold_style, instance.parameters.level_overboughtsold_width, instance.parameters.level_overboughtsold_color); 
	
end

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

    
	if period < source:first() +Period2
	then
	return;
	end
	
	local diff = source[period] - source[period - Period2]; 
	
	if diff> 0 then
	Positive[period]=diff;
	Negative[period]=0;
	else
	Positive[period]=0;
	Negative[period]=-diff;
	end
	
	MA1:update(mode);
	MA2:update(mode);
	 
    if period < first then
	return;
	end 
		
     Oscillator[period ]=  100 - (100 / (1 + MA1.DATA[period] / MA2.DATA[period]));
				  
end