-- Id: 9028
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=35289


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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("Rainbow Oscillator");
    indicator:description("Rainbow Oscillator");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);
    indicator.parameters:addGroup("Calculation");
    indicator.parameters:addInteger("Period", "Period", "Period", 10);
	indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("RO_color", "Color of RO", "Color of RO", core.rgb(255, 0, 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 Period;

local first;
local source = nil;

-- Streams block
local RO = nil;
local Avg={};
-- Routine
function Prepare(nameOnly)
    Period = instance.parameters.Period;
    source = instance.source;
    first = source:first()+Period;
	
	local i;
	for i = 1, Period, 1 do
	Avg[i] = instance:addInternalStream(0, 0);
	end

    local name = profile:id() .. "(" .. source:name() .. ", " .. tostring(Period) .. ")";
    instance:name(name);
	
	 if   (nameOnly) then
        return;
    end


   
        RO = instance:addStream("RO", core.Line, name, "RO", instance.parameters.RO_color, first);
    RO:setPrecision(math.max(2, instance.source:getPrecision()));
		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)
    if period < first  then
	return;
	end
	local i;
	local Sum=0;
	local min, max;
	min,max=mathex.minmax(source, period-Period+1, period);
	
	for i = 1, Period, 1 do
		if i == 1 then
		Avg[i][period]=mathex.avg(source, period-2+1, period);
		else
		Avg[i][period]=mathex.avg(Avg[i-1], period-2+1, period);
		end	
	    Sum= Sum+Avg[i][period];
	end
	
	
        RO[period] = 100 * (source[period] - ( Sum/ Period)) / ( max -min );		
    
end