-- 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("Tick Influx");
    indicator:description("Tick Influx");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);
    indicator.parameters:addGroup("Calculation");
 
    indicator.parameters:addInteger("DurationOfFast", "Fast MA Duration in seconds", "Fast MA Duration in seconds", 100);
    indicator.parameters:addInteger("DurationOfSlow", "Slow MA Duration in seconds", "Slow MA Duration in seconds", 200);
    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);
 
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 Fast = nil;
local Slow = nil;
local DurationOfFast;
local DurationOfSlow;
local MACD;

 
-- Routine
function Prepare(nameOnly)
    DurationOfFast = instance.parameters.DurationOfFast;
    DurationOfSlow = instance.parameters.DurationOfSlow; 
    source = instance.source;
    first=source:first();

    local name = profile:id() .. "(" .. source:name() .. ")";
    instance:name(name);
	 
    if (not (nameOnly)) then
        RawFast= instance:addInternalStream(0, 0);
        RawSlow= instance:addInternalStream(0, 0);
		Fast= instance:addInternalStream(0, 0);
        Slow= 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());
      
    end
end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period)

	
	if period <= first then
	return;
	end

	local P1, P2;
    local One=1/86400;
	P1= core.findDate (source, source:date(period)-One*DurationOfFast, false);
	P2= core.findDate (source, source:date(period)-One*DurationOfSlow, false);
	 
	 
	if P1==-1 or P2==-1 
	or P1< first+1 or P2< first+1
	or P1 >= period or P2  >= period
    then
    return;
    end
	
        RawFast[period] = mathex.avg(source ,P1, period);
        RawSlow[period]  = mathex.avg(source ,P2, period);
		
 
	local FastMA,SlowMA;
		
		FastMA= mathex.avg(RawFast,P1, period);
		SlowMA=  mathex.avg( RawSlow, P2, period);
		
        Fast[period]= RawFast[period] + RawFast[period] - FastMA;
        Slow[period]= RawSlow[period] + RawSlow[period] - SlowMA;
	 	MACD[period]= Fast[period]-Slow[period];
 
	 
		
	 
end