-- Id: 3666
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=1225

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function Init()
    indicator:name("Coppock Indicator");
    indicator:description("Identify the commencement of bull markets");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);

    indicator.parameters:addInteger("ShortROC", "ShortROC", "", 14,2,2000);
    indicator.parameters:addInteger("LongROC", "LongROC", "", 11,2,2000);
    indicator.parameters:addInteger("Frame", "Weighted Moving Average Period", "", 10,2,2000);
    indicator.parameters:addColor("Up_color", "Color of Positiv Coppock", "", core.rgb(0, 255, 0));
	indicator.parameters:addColor("Down_color", "Color of Negativ Coppock", "", core.rgb(255, 0, 0));
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 ShortRSI;
local LongRSI;
local Frame;
local ShortFrame;
local LongFrame;

local first;
local source = nil;

-- Streams block
local Coppock = nil;
local Temp=nil;
local LWMA=nil;

-- Routine
function Prepare(nameOnly)
    ShortFrame = instance.parameters.ShortROC;
    LongFrame = instance.parameters.LongROC;
    Frame = instance.parameters.Frame;
    source = instance.source;
   
	
    local name = profile:id() .. "(" .. source:name() .. ", " .. ShortFrame .. ", " .. LongFrame .. ", " .. Frame .. ")";
	instance:name(name);
	if nameOnly then
		return;
	end
	LongRSI = core.indicators:create("ROC", source, LongFrame);
	ShortRSI = core.indicators:create("ROC", source, ShortFrame);
	Temp = instance:addInternalStream(0, 0);
	LWMA = core.indicators:create("LWMA", Temp, Frame);
    
	  first =math.max(LongRSI.DATA:first() , ShortRSI.DATA:first()  )
    Coppock = instance:addStream("Coppock", core.Bar, name, "Coppock", instance.parameters.Up_color,  LWMA.DATA:first());
	
	Coppock:setPrecision(math.max(2, instance.source:getPrecision()));

end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period,mode)
 
 
     ShortRSI:update(mode);
	 LongRSI:update(mode);
	 
	 if period <  first then
		return;
		end

	 Temp[period]=ShortRSI.DATA[period] + LongRSI.DATA[period];
	 
	 
	 	
	
	    LWMA:update(mode);   
		
		 if period <  LWMA.DATA:first() then
		return;
		end
        Coppock[period] = LWMA.DATA[period];
			if Coppock[period]> 0 then
			Coppock:setColor(period, instance.parameters.Up_color);
			else
			Coppock:setColor(period, instance.parameters.Down_color);
			end
		 
end