-- Id: 934
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=1356

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function Init()
    indicator:name(" Range Action Verification Index ");
    indicator:description("Identify whether a market or security is trending");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);
    indicator.parameters:addGroup("Calculation");
    indicator.parameters:addInteger("S", "Slow moving averages Period", "Slow moving averages Period", 24);
    indicator.parameters:addInteger("F", "Fast moving averages Period", "Fast moving averages Period", 14);
	
	indicator.parameters:addGroup("Style");  
	indicator.parameters:addColor("RAVI", "Color of RAVI", "Color of  RAVI", 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 Slow;
local Fast;

local first;
local source = nil;

-- Streams block
local RAVI = nil;
local LONG=nil;
local SHORT = nil;

-- Routine
function Prepare(nameOnly)
    Slow = instance.parameters.S;
    Fast = instance.parameters.F;
    source = instance.source;
   
    local name = profile:id() .. "(" .. source:name() .. ", " .. Slow .. ", " .. Fast .. ")";
    instance:name(name);
    if nameOnly then
        return;
    end
	
	LONG = core.indicators:create("MVA", source, Slow);
	SHORT = core.indicators:create("MVA", source, Fast);
	 first = math.max(LONG.DATA:first(), SHORT.DATA:first());
	 
    RAVI = instance:addStream("RAVI", core.Line, name, "RAVI", instance.parameters.RAVI, first);
    RAVI:setPrecision(math.max(2, instance.source:getPrecision()));
	RAVI:setWidth(instance.parameters.width);
    RAVI: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 then
	 return;
	 end
	 
	
       RAVI[period] =  math.abs(100*(SHORT.DATA[period] -LONG.DATA[period]) / LONG.DATA[period]);
	   
      
		
  
end