-- Id: 10153
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=1856

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-- Indicator profile initialization routine
-- Defines indicator profile properties and indicator parameters
function Init()
    indicator:name("Moving Average of Oscillator");
    indicator:description("Difference between the Moving Average Convergence/Divergence and the signal line.");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);
 

    indicator.parameters:addGroup("Calculation");
	indicator.parameters:addString("Method", "MA Method", "Method" , "EMA");
    indicator.parameters:addStringAlternative("Method", "MVA", "MVA" , "MVA");
    indicator.parameters:addStringAlternative("Method", "EMA", "EMA" , "EMA");
   indicator.parameters:addStringAlternative("Method", "LWMA", "LWMA" , "LWMA");
    indicator.parameters:addStringAlternative("Method", "TMA", "TMA" , "TMA");
    indicator.parameters:addStringAlternative("Method", "SMMA", "SMMA" , "SMMA");
    indicator.parameters:addStringAlternative("Method", "KAMA", "KAMA" , "KAMA");
    indicator.parameters:addStringAlternative("Method", "VIDYA", "VIDYA" , "VIDYA");
    indicator.parameters:addStringAlternative("Method", "WMA", "WMA" , "WMA");
    indicator.parameters:addInteger("SN", "Short MA", "The period of the short MA", 12, 2, 1000);	
    indicator.parameters:addInteger("LN", "Long MA", "The period of the Long MA", 26, 2, 1000);
    indicator.parameters:addInteger("IN", "Signal line", "The number of periods for the signal line.", 9, 2, 1000);
    indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("OsMAUP", "Color of UP OsMA", "Color of UP OsMA", core.rgb(0, 255, 0));
	indicator.parameters:addColor("OsMADOWN", "Color of DOWN OsMA", "Color of DOWN OsMA", core.rgb(255, 0, 0));
	 indicator.parameters:addColor("Label", "Color of Label", "Color of Label", core.rgb(0, 0, 0));
	 indicator.parameters:addInteger("Size", "Font Size", "", 10);
 	
   
end

-- Indicator instance initialization routine
-- Processes indicator parameters and creates output streams
-- Parameters block
local SN;
local LN;
local IN;
 
local Method;
local firstPeriodMACD;

local firstPeriodSIGNAL;
local source = nil;

local EMAS = nil;
local EMAL = nil;
local MVAI = nil;
local Max;
-- Streams block
local MACD = nil; 
local OsMA = nil;
local Sum;
local  font,Size;
-- Routine
 function Prepare(nameOnly) 
    
    Method = instance.parameters.Method;
    SN = instance.parameters.SN;
    LN = instance.parameters.LN;
    IN = instance.parameters.IN;
	Size = instance.parameters.Size;
    source = instance.source;
	
	
	-- Base name of the indicator.
    local name = profile:id() .. "(" .. source:name() .. ", " .. SN .. ", " .. LN .. ", " .. IN.. ", " .. Method .. ")";
    instance:name(name);
	
	if   (nameOnly) then
        return;
    end
	
	
	font = core.host:execute("createFont", "Courier", Size, false,true);


    -- Check parameters
    if (LN <= SN) then
       error("The short EMA period must be smaller than long EMA period");
    end

    -- Create short and long EMAs for the source
    EMAS = core.indicators:create(Method, source, SN);
    EMAL = core.indicators:create(Method, source, LN);

    

    -- Create the output stream for the MACD. The first period is equal to the
    -- biggest first period of source EMA streams
    firstPeriodMACD = EMAL.DATA:first();
    MACD = instance:addInternalStream(0, 0);

    -- Create MVA for the MACD output stream.
    MVAI = core.indicators:create(Method, MACD, IN);

	
    firstPeriodSIGNAL = MVAI.DATA:first();
    SIGNAL=instance:addInternalStream(0, 0);
	Sum=instance:addInternalStream(0, 0);
	Max=instance:addInternalStream(0, 0);
	 
	OsMA = instance:addStream("OsMA", core.Bar, name .. ".OsMA", "OsMA", instance.parameters.OsMAUP, firstPeriodSIGNAL);
	
	
	OsMA:setPrecision(math.max(2, instance.source:getPrecision()));
	 
end

-- Indicator calculation routine
function Update(period, mode)
    -- and update short and long EMAs for the source.
    EMAS:update(mode);
    EMAL:update(mode);

    if (period <firstPeriodMACD) then	
    return;
	end
	
         MACD[period] = EMAS.DATA[period] - EMAL.DATA[period];
 
  
    MVAI:update(mode);
    if (period < firstPeriodSIGNAL) then
	return;
	end
      
       
        OsMA[period] = MACD[period] -  MVAI.DATA[period];
		
		if core.crosses (OsMA, 0, period)then
		Sum[period]=math.abs(OsMA[period]/source:pipSize());
		Max[period]=OsMA[period];
		core.host:execute("drawLabel1", source:serial(period), source:date(period), core.CR_CHART, Max[period-1], core.CR_CHART, core.H_Right, core.V_Center,
                             font, instance.parameters.Label , string.format("%." .. source:getPrecision () .. "f", Sum[period-1])  );

		else
		Sum[period]=Sum[period-1]+ math.abs (OsMA[period]/source:pipSize());
			if (OsMA[period] > 0 )then 
			Max[period]= math.max(Max[period-1], OsMA[period]);
			else
			 Max[period]=math.min(Max[period-1], OsMA[period]); 
			end
		end
		
	 
		
			if OsMA[period] > OsMA[period-1] then
			OsMA:setColor(period, instance.parameters.OsMAUP);			 
			else
			OsMA:setColor(period, instance.parameters.OsMADOWN);			 
			end
		 
		 if period == source:size()-1 then
		 core.host:execute("drawLabel1", 1, source:date(period), core.CR_CHART, Max[period], core.CR_CHART, core.H_Right, core.V_Center,
                             font, instance.parameters.Label ,"(" .. string.format("%." .. source:getPrecision () .. "f",   Sum[period]) ..")" );
         end
end


function ReleaseInstance()
       core.host:execute("deleteFont", font);
        
   end