-- Id: 1311
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=1882&sid=e771a98f6d78bea9bee97875e3ca9bbb

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function Init()
    indicator:name("RSI Oscillator");
    indicator:description("RSI Oscillator");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);
    
	indicator.parameters:addGroup("RSI Calculation");
    indicator.parameters:addInteger("ShortFrame", "Short RSI Period", "Short RSI Period", 10);
    indicator.parameters:addInteger("LongFrame", "Long RSI Period", "Long RSI Period", 25);
	indicator.parameters:addGroup("MVA Smoothing");
    indicator.parameters:addInteger("MVAFrame", "MVA Period", "MVA Period", 5);	
	
	indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("color", "Line Color" , "Color", core.rgb(0, 255, 0));
	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 ShortFrame;
local LongFrame;
local MVAFrame;

local Short=nil;
local Long=nil;
local MVA=nil;

local first;
local source = nil;

-- Streams block
local Buffer=nil;

local RO = nil;

-- Routine
function Prepare(nameOnly)
    ShortFrame = instance.parameters.ShortFrame;
    LongFrame = instance.parameters.LongFrame;
    MVAFrame = instance.parameters.MVAFrame;
    source = instance.source;
   
	
	Long = core.indicators:create("RSI", source, LongFrame);
	Short = core.indicators:create("RSI", source, ShortFrame);
	
	first = math.max(Long.DATA:first(), Short.DATA:first());

	local name = profile:id() .. "(" .. source:name() .. ", " .. ShortFrame .. ", " .. LongFrame .. ", " .. MVAFrame .. ")";
	instance:name(name);
	if nameOnly then
		return;
	end
	Buffer=instance:addInternalStream(first, 0);
	
	MVA = core.indicators:create("MVA", Buffer, MVAFrame);


	
	RO = instance:addStream("RO", core.Line, name, "RO", instance.parameters.color, MVA.DATA:first());	 
    RO:setPrecision(math.max(2, instance.source:getPrecision()));
	RO:addLevel(0);    
	RO:setWidth(instance.parameters.width);
    RO:setStyle(instance.parameters.style);
   
end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period,mode)
	
	
	Long:update(mode);
	Short:update(mode);	
	
    if period < first or not source:hasData(period) then
	return;
	end

	
	Buffer[period]=Short.DATA[period]-Long.DATA[period];
	
			
			
	 MVA:update(mode);	
			
	if period< MVA.DATA:first() then
	return;
	end 
	
	RO[period] = MVA.DATA[period];
 
	 
end