-- Id: 9418

-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=41810

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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("Unsmoothed RSI");
    indicator:description("");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);
   
   
    indicator.parameters:addGroup("Calculation");
    indicator.parameters:addInteger("RP", "RSI Period", "", 14, 2, 1000);
    
	 indicator.parameters:addGroup("Indicator Style");
	 indicator.parameters:addColor("RSI_color", "RSI color", "(RSI Color) Red", core.rgb(255, 0, 0));
	indicator.parameters:addInteger("RSI_width", "RSI Line width", "Line width", 1, 1, 5);
    indicator.parameters:addInteger("RSI_style", "RSI Line style", "Line style", core.LINE_SOLID);
    indicator.parameters:setFlag("RSI_style", core.FLAG_LINE_STYLE);

	
	 indicator.parameters:addGroup("OB/OS Levels");	
    indicator.parameters:addDouble("overbought", "Overbought Level","", 80);
    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
-- 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 Method, RP ;
local RSI ;
local pos, neg;

-- Streams block
 
-- Routine
function Prepare(nameOnly)
    
    source = instance.source;
	RP = instance.parameters.RP;
	pos = instance:addInternalStream(0, 0);
    neg = instance:addInternalStream(0, 0);
    first= source:first()+RP-1;
	 
    local name = profile:id() .. "(" .. source:name() .. ", " .. RP   .. ")";
    instance:name(name);
	
	if   (nameOnly) then
        return;
    end
  
    
    RSI = instance:addStream("MACD", core.Line, name .. ".RSI", "RSI", instance.parameters.RSI_color,  first );
    RSI:setPrecision(math.max(2, instance.source:getPrecision()));
	RSI:setWidth(instance.parameters.RSI_width);
    RSI:setStyle(instance.parameters.RSI_style);
  
    RSI:addLevel(instance.parameters.oversold, instance.parameters.level_overboughtsold_style, instance.parameters.level_overboughtsold_width, instance.parameters.level_overboughtsold_color);
	 RSI:addLevel(instance.parameters.overbought, instance.parameters.level_overboughtsold_style, instance.parameters.level_overboughtsold_width, instance.parameters.level_overboughtsold_color);    
		
 
end

 

 function Calculate(period )
  
   
    if first > period then
	return;
	end
	
	local i = 0;
       
        local diff = 0;
        if (period == first) then
            for i = period - RP + 1, period do
                diff = source[i] - source[i - 1];
                if (diff >= 0) then
                    pos[i] =   diff;
                else
                    neg[i] = - diff;
                end
            end
            
        else
            diff = source[period] - source[period - 1];
            if (diff > 0) then 
                pos[period] = diff;
            else
                neg[period] = -diff;
            end
             
        end
		
		local P,N;
		P= mathex.sum(pos, period-RP+1, period);
        N= mathex.sum(neg, period-RP+1, period); 
        if (N == 0) then
            RSI[period] = 0;
        else
            RSI[period] = 100 - (100 / (1 + P / N));
        end
	
	 
	
 
 
 end
 

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period )  

    Calculate(period );
	 
end