-- Id: 15704

-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=63275

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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("POGO");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);
	
	indicator.parameters:addGroup("Calculation");
	indicator.parameters:addInteger("Period", " Period","" , 14);
    indicator.parameters:addString("Method", "MA Method", "Method" , "MVA");
    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:addGroup("Style");	 
    indicator.parameters:addColor("color", "Line Color", "", core.rgb(0, 0, 255));
	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 Line,Raw, first,Method,MA;
-- Routine
function Prepare(nameOnly)
  
	Method=instance.parameters.Method; 
    Period =instance.parameters.Period;
		
    source = instance.source;
	
	 local name = profile:id() .. "(" .. source:name()  .. ")";
    instance:name(name);
	
	if   (nameOnly) then
        return;
    end
	
	
	Raw = instance:addInternalStream(source:first(), 0);
    assert(core.indicators:findIndicator(Method) ~= nil, Method .. " indicator must be installed");
	MA = core.indicators:create(Method, Raw, Period);
	first=MA.DATA:first();
	
	
   
   POGO= instance:addStream("POGO", core.Line, name, "POGO", instance.parameters.color,first);
    POGO:setPrecision(math.max(2, instance.source:getPrecision()));
   POGO:setWidth(instance.parameters.width);
   POGO:setStyle(instance.parameters.style);
 
end
 
-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period,mode)

  
   Raw[period]= source.open[period]-source.close[period];
  
   
   if period <  first then
   return;
   end
   MA:update(mode);
   POGO[period]= MA.DATA[period];
     
end