-- Id: 13833
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=1225

--+------------------------------------------------------------------+
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--|                                            http://fxcodebase.com |
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--|                                      Developed by : Mario Jemic  |
--|                                          mario.jemic@gmail.com   |
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--+------------------------------------------------------------------+

function Init()
    indicator:name("Coppock ROC Indicator");
    indicator:description("Identify the commencement of bull markets");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);
    indicator.parameters:addGroup("Coppock Calculation");
    indicator.parameters:addInteger("ShortROC", "Short ROC", "", 14,2,2000);
    indicator.parameters:addInteger("LongROC", "Long ROC", "", 11,2,2000);
    indicator.parameters:addInteger("Frame", "Weighted Moving Average Period", "", 10,2,2000);
	indicator.parameters:addGroup("ROC Calculation");
	indicator.parameters:addInteger("ROC", "ROC Period", "", 14,2,2000);
	indicator.parameters:addDouble("Level", "Strong ROC Level", "", 0);
	indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("Strong_color", "Color of Strong Coppock ROC", "", core.rgb(0, 255, 0));
	indicator.parameters:addColor("Weak_color", "Color of Weak Coppock ROC", "", core.rgb(255, 0, 0));
	
	indicator.parameters:addString("Type", "Presentation Method", "Type" , "Value");
    indicator.parameters:addStringAlternative("Type", "Value", "Value" , "Value");
    indicator.parameters:addStringAlternative("Type", "Bar", "Bar" , "Bar");
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 Type;
local first;
local source = nil;

-- Streams block
local Coppock = nil;
local Temp=nil;
local LWMA=nil;
local Level;
-- Routine
function Prepare(nameOnly)
    ShortFrame = instance.parameters.ShortROC;
    LongFrame = instance.parameters.LongROC;
    Frame = instance.parameters.Frame;
	ROC = instance.parameters.ROC;
	Level = instance.parameters.Level;
	Type = instance.parameters.Type;
    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 = LWMA.DATA:first() +ROC;
    Coppock = instance:addStream("Coppock", core.Bar, name, "Coppock", instance.parameters.Strong_color, 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 < math.max(LongRSI.DATA:first() , ShortRSI.DATA:first()) then
		return;
	end

	 Temp[period]=ShortRSI.DATA[period] + LongRSI.DATA[period];
	 
	LWMA:update(mode);  
	  
		if period < first then
		return;
		end
		
		
	core.host:execute ("setStatus",  win32.formatNumber(LWMA.DATA[period], false, source:getPrecision()) .. " - "  ..  win32.formatNumber( LWMA.DATA[period-ROC+1], false, source:getPrecision())   ..  " = Coppock ROC" )	
		
	    if Type == "Value" then
        Coppock[period] =  LWMA.DATA[period]-LWMA.DATA[period-ROC+1]  ;
		else
		 Coppock[period]=1;
		end
		
			if ( LWMA.DATA[period]-LWMA.DATA[period-ROC+1] ) >= Level then
			Coppock:setColor(period, instance.parameters.Strong_color);
			elseif  ( LWMA.DATA[period]-LWMA.DATA[period-ROC+1]) <= -Level then
			Coppock:setColor(period, instance.parameters.Strong_color);
			else
			Coppock:setColor(period, instance.parameters.Weak_color);
			end
		
    
end