-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=62160

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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("Timed MACD");
    indicator:description("Timed MACD");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);
    indicator.parameters:addGroup("Calculation");
	
	indicator.parameters:addString("Price", "Price Source", "", "close");
    indicator.parameters:addStringAlternative("Price", "OPEN", "", "open");
    indicator.parameters:addStringAlternative("Price", "HIGH", "", "high");
    indicator.parameters:addStringAlternative("Price", "LOW", "", "low");
    indicator.parameters:addStringAlternative("Price","CLOSE", "", "close");
    indicator.parameters:addStringAlternative("Price", "MEDIAN", "", "median");
    indicator.parameters:addStringAlternative("Price", "TYPICAL", "", "typical");
    indicator.parameters:addStringAlternative("Price", "WEIGHTED", "", "weighted");	

    indicator.parameters:addInteger("DurationOfFast", "Fast MA Duration in seconds", "Fast MA Duration in seconds", 60);
    indicator.parameters:addInteger("DurationOfSlow", "Slow MA Duration in seconds", "Slow MA Duration in seconds", 2500);
	indicator.parameters:addInteger("DurationOfSignal", "Signal MA Duration in seconds", "Signal MA Duration in seconds", 90);
	
    indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("Color", "Color of MACD", "Color of MACD", 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);
	
	indicator.parameters:addColor("Color2", "Color of Signal", "Color of Siganal", core.rgb(0, 255, 0));
	indicator.parameters:addInteger("Width2", "Line width", "", 1, 1, 5);
    indicator.parameters:addInteger("Style2", "Line style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("Style2", core.FLAG_LINE_STYLE);
	
	indicator.parameters:addColor("Color3", "Color of Histogram", "Color of Histogram", core.rgb(0, 0, 255));

 
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 first;
local source = nil;

-- Streams block
local RawFast = nil;
local RawSlow = nil; 
local DurationOfFast;
local DurationOfSlow;
local DurationOfSignal;
 
local MACD;
local BarSize;
local Price;
local Signal;
local Histogram;
local Second;
-- Routine
function Prepare(nameOnly)
    Second =(1/86400);
    DurationOfFast = instance.parameters.DurationOfFast*Second;
    DurationOfSlow = instance.parameters.DurationOfSlow*Second;
	DurationOfSignal= instance.parameters.DurationOfSignal*Second;
	Price= instance.parameters.Price;
    source = instance.source;
    first=source:first();
	
	  local name = profile:id() .. "(" .. source:name().. ", " .. tostring(Price) .. ", " .. tostring(DurationOfFast) .. ", " .. tostring(DurationOfSlow) .. ", " .. tostring(DurationOfSignal).. ")";
    instance:name(name);
	
	if   (nameOnly) then
        return;
    end
	
	 
   
        RawFast= instance:addInternalStream(0, 0);
        RawSlow= instance:addInternalStream(0, 0); 
        MACD = instance:addStream("MACD", core.Line, name .. ".MACD", "MACD", instance.parameters.Color, source:first());
		MACD:setWidth(instance.parameters.Width);
        MACD:setStyle(instance.parameters.Style);
		MACD:setPrecision (source:getPrecision());
		
		Signal = instance:addStream("Signal", core.Line, name .. ".Signal", "Signal", instance.parameters.Color2, source:first());
		Signal:setWidth(instance.parameters.Width2);
        Signal:setStyle(instance.parameters.Style2);
		Signal:setPrecision (source:getPrecision());
		
		Histogram = instance:addStream("Histogram", core.Bar, name .. ".Histogram", "Histogram", instance.parameters.Color3, source:first());
		Histogram:setPrecision (source:getPrecision());
      
    
end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period)
 
  
	 
	local P1= core.findDate (source, source:date(period)-DurationOfFast, false);
	local P2= core.findDate (source, source:date(period)-DurationOfSlow, false);
	local P3= core.findDate (source, source:date(period)-DurationOfSignal, false);
	
	if P1==-1 or P2==-1  or P3==-1 
	or P1< first or P2< first  or P3< first
    then
    return;
    end
	
        RawFast[period] = mathex.avg(source[Price],P1, period);
        RawSlow[period]  = mathex.avg(source[Price],P2, period);
		
 
	 	MACD[period]= RawFast[period]-RawSlow[period];
        Signal[period]= mathex.avg(MACD,P3, period);
		Histogram[period]= MACD[period]-Signal[period];
		
	 
end