-- Id: 6268
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=15547

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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("MA on MA");
    indicator:description("MA on MA");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);

    indicator.parameters:addGroup("Calculation");
	indicator.parameters:addInteger("Period1", "First Average Period", "", 20);
	indicator.parameters:addString("Method1", "First Average Method", "" , "MVA");
    indicator.parameters:addStringAlternative("Method1", "MVA", "MVA" , "MVA");
    indicator.parameters:addStringAlternative("Method1", "EMA", "EMA" , "EMA");
	indicator.parameters:addStringAlternative("Method1", "LWMA", "LWMA" , "LWMA");
    indicator.parameters:addStringAlternative("Method1", "TMA", "TMA" , "TMA");
    indicator.parameters:addStringAlternative("Method1", "SMMA", "SMMA" , "SMMA");
    indicator.parameters:addStringAlternative("Method1", "KAMA", "KAMA" , "KAMA");
    indicator.parameters:addStringAlternative("Method1", "VIDYA", "VIDYA" , "VIDYA");
    indicator.parameters:addStringAlternative("Method1", "WMA", "WMA" , "WMA");
	
	
	indicator.parameters:addInteger("Period2", "Second Average Period", "", 20);
	indicator.parameters:addString("Method2", "Second Average Method", "" , "MVA");
    indicator.parameters:addStringAlternative("Method2", "MVA", "MVA" , "MVA");
    indicator.parameters:addStringAlternative("Method2", "EMA", "EMA" , "EMA");
	indicator.parameters:addStringAlternative("Method2", "LWMA", "LWMA" , "LWMA");
    indicator.parameters:addStringAlternative("Method2", "TMA", "TMA" , "TMA");
    indicator.parameters:addStringAlternative("Method2", "SMMA", "SMMA" , "SMMA");
    indicator.parameters:addStringAlternative("Method2", "KAMA", "KAMA" , "KAMA");
    indicator.parameters:addStringAlternative("Method2", "VIDYA", "VIDYA" , "VIDYA");
    indicator.parameters:addStringAlternative("Method2", "WMA", "WMA" , "WMA");
	
	indicator.parameters:addInteger("Period3", "Signal Average Period", "", 20);
	indicator.parameters:addString("Method3", "Signal Average Method", "" , "MVA");
    indicator.parameters:addStringAlternative("Method3", "MVA", "MVA" , "MVA");
    indicator.parameters:addStringAlternative("Method3", "EMA", "EMA" , "EMA");
	indicator.parameters:addStringAlternative("Method3", "LWMA", "LWMA" , "LWMA");
    indicator.parameters:addStringAlternative("Method3", "TMA", "TMA" , "TMA");
    indicator.parameters:addStringAlternative("Method3", "SMMA", "SMMA" , "SMMA");
    indicator.parameters:addStringAlternative("Method3", "KAMA", "KAMA" , "KAMA");
    indicator.parameters:addStringAlternative("Method3", "VIDYA", "VIDYA" , "VIDYA");
    indicator.parameters:addStringAlternative("Method3", "WMA", "WMA" , "WMA");
	
	indicator.parameters:addGroup("Style");	
    indicator.parameters:addColor("MAonMA", "Color of MAonMA", "", core.rgb(0, 255, 0));
	indicator.parameters:addInteger("width1", "Line width", "", 1, 1, 5);
	indicator.parameters:addInteger("style1", "Line style", "", core.LINE_SOLID);
	indicator.parameters:setFlag("style1", core.FLAG_LINE_STYLE);
	indicator.parameters:addColor("Histogram", "Color of Histogram", "", core.rgb(255, 0, 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("Signal", "Color of Signal", "", 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 Method1, Method2, Method3;
local Period1, Period2, Period3;
local first;
local source = nil;

-- Streams block
local MAonMA = nil;
local Signal = nil;
local MA, MA2, MA3;
local Histogram;
-- Routine
function Prepare(nameOnly)
    Method1 = instance.parameters.Method1;
	Method2 = instance.parameters.Method2;
	Method3 = instance.parameters.Method3;
	Period1 = instance.parameters.Period1;
	Period2 = instance.parameters.Period2;
	Period3 = instance.parameters.Period3;
    source = instance.source;
   
	
    local name = profile:id() .. "(" .. source:name() .. ", " .. tostring(Method1).. ", " .. tostring(Period1).. ", " .. tostring(Method2).. ", " .. tostring(Period2).. ", " .. tostring(Method3).. ", " .. tostring(Period3) .. ")";
    instance:name(name);

	if   (nameOnly) then
        return;
    end
	
    assert(core.indicators:findIndicator(Method1) ~= nil, Method1 .. " indicator must be installed");
	MA1= core.indicators:create(Method1,source, Period1);
    assert(core.indicators:findIndicator(Method2) ~= nil, Method2 .. " indicator must be installed");
	MA2= core.indicators:create(Method2,MA1.DATA, Period2);
	first =math.max(  MA1.DATA:first(), MA2.DATA:first());

 
        MAonMA = instance:addStream("MAonMA", core.Line, name .. ".MAonMA", "MAonMA", instance.parameters.MAonMA, first);
    MAonMA:setPrecision(math.max(2, instance.source:getPrecision()));
		MAonMA:setWidth(instance.parameters.width1);
		MAonMA:setStyle(instance.parameters.style1);

    assert(core.indicators:findIndicator(Method3) ~= nil, Method3 .. " indicator must be installed");
		MA3= core.indicators:create(Method3,MAonMA, Period3);
        Signal = instance:addStream("Signal", core.Line, name .. ".Signal", "Signal", instance.parameters.Signal, MA3.DATA:first());
    Signal:setPrecision(math.max(2, instance.source:getPrecision()));
		Signal:setWidth(instance.parameters.width2);
		Signal:setStyle(instance.parameters.style2);
		Histogram = instance:addStream("Histogram", core.Bar, name .. ".Histogram", "Histogram", instance.parameters.Histogram, MA3.DATA:first());
    Histogram:setPrecision(math.max(2, instance.source:getPrecision()));
    
end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period, mode)
    if period < first then
	return;
	end
        
		
	    MA1:update(mode);
		MA2:update(mode);
		
		
		MAonMA[period] = MA1.DATA[period] -MA2.DATA[period];
		
		MA3:update(mode);
		
        Signal[period] = MA3.DATA[period];
		
		Histogram[period] = MAonMA[period] -Signal[period];	
		
 end