-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=73014

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

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--|                                           Our work would not be possible without your support. |
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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("Momentum Indicator");
    indicator:description("");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);

  
 	indicator.parameters:addGroup("Calculation");	
    indicator.parameters:addInteger("Period1", "Momentum Period", "", 6, 1, 2000);
    indicator.parameters:addInteger("Period2", "Signal Line Period", "", 6, 1, 2000);
	
	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("Line Style");	
    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("color", "Momentum Line Color", "", core.rgb(0, 0, 255)); 
	 indicator.parameters:addColor("Up", "Up Line Color", "", core.rgb(0, 255, 0)); 
	 indicator.parameters:addColor("Down", "Down Line Color", "", core.rgb(255, 0, 0)); 	 
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;
local Period1, Period2,Method; 
local Indicator;
	
-- Routine
 function Prepare(nameOnly)   
 
    
	Period1=instance.parameters.Period1;
	Period2=instance.parameters.Period2;
	Method=instance.parameters.Method;
	source = instance.source
 
    local name = profile:id() .. "(" ..  instance.source:name().. "," ..  Period1.. "," ..  Period2.. "," ..  Method  .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end
	 
	first=source:first() +Period1;  
	
	
    Momentum = instance:addStream("Momentum", core.Line, name, "Momentum", instance.parameters.color, first  );
    Momentum:setPrecision(math.max(2, instance.source:getPrecision()));
    Momentum:setWidth(instance.parameters.width);
    Momentum:setStyle(instance.parameters.style);
    Momentum:addLevel(0);	
 
 	Indicator= core.indicators:create(Method, Momentum, Period2);
	
    Signal = instance:addStream("Signal", core.Line, name, "Signal", instance.parameters.Up, first+Period2 );
    Signal:setPrecision(math.max(2, instance.source:getPrecision()));
    Signal:setWidth(instance.parameters.width);
    Signal:setStyle(instance.parameters.style);
    Signal:addLevel(0);	
end


function Update(period, mode)


  	if period <= first then
	return;
	end
	
    Momentum[period]= source[period]-source[period-Period1+1  ]


	 Indicator:update(mode); 
	 if period <= first+Period2 then
	 return;
	 end
	  
  	
	Signal[period]= Indicator.DATA[period];
	
	if Momentum[period] > Signal[period] then
	Signal:setColor(period, instance.parameters.Up);	
	else
	Signal:setColor(period,  instance.parameters.Down);		
	end
	
end


--+------------------------------------------------------------------------------------------------+
--|                                                                    We appreciate your support. | 
--+------------------------------------------------------------------------------------------------+
--|                                                               Paypal: https://goo.gl/9Rj74e    |
--|                                                             Patreon :  https://goo.gl/GdXWeN   |  
--+------------------------------------------------------------------------------------------------+
--|                                                                   Developed by : Mario Jemic   |                    
--|                                                                       mario.jemic@gmail.com    |
--|                                                        https://AppliedMachineLearning.systems  |
--|                                                                       https://mario-jemic.com/ |
--+------------------------------------------------------------------------------------------------+


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--|LiteCoin                   : LLU8PSY2vsq7B9kRELLZQcKf5nJQrdeqwD                                 |  
--+------------------------------------------------------------------------------------------------+