-- Id: 10229
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=59655

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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("Time Averaged MA");
    indicator:description("Time Averaged MA");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);

	indicator.parameters:addGroup("Calculation");

    indicator.parameters:addInteger("Period", "Period", "Period", 0, 0, 2000);
	
	indicator.parameters:addString("Price", "Period Price Source", "", "median");
    indicator.parameters:addStringAlternative("Price", "MEDIAN", "", "median");
    indicator.parameters:addStringAlternative("Price", "TYPICAL", "", "typical");
    indicator.parameters:addStringAlternative("Price", "WEIGHTED", "", "weighted");	
	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:addInteger("MaPeriod", "MA Period", "MA 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("MA_color", "Color of MA", "Color of MA", 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 Period;
local MaPeriod;
local Price;
local first;
local source = nil;
local Method;
-- Streams block
local MA, Raw, ma;

-- Routine
function Prepare(nameOnly)
    Period =  instance.parameters.Period;
	Method = instance.parameters.Method;
	Price = instance.parameters.Price;
    MaPeriod = instance.parameters.MaPeriod;
    source = instance.source;
	Raw = instance:addInternalStream(0, 0);
	
    assert(core.indicators:findIndicator(Method) ~= nil, Method .. " indicator must be installed");
	MA = core.indicators:create(Method, Raw, MaPeriod);
    first = MA.DATA:first();

    local name = profile:id() .. "(" .. source:name() .. ", " .. tostring(Period).. ", " .. tostring(Price) .. ", " .. tostring(MaPeriod)  .. ", " .. tostring(Method).. ")";
    instance:name(name);
	
	Period=Period+1;

    if   (nameOnly) then
        return;
    end
        ma = instance:addStream("MA", core.Line, name, "MA", instance.parameters.MA_color, first);
		ma:setWidth(instance.parameters.width);
        ma:setStyle(instance.parameters.style);
    
end

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

    if period < Period then
	return;
	end
	local min, max;
	
	min,max= mathex.minmax(source, period-Period+1 , period )
	
	if Price == "median" then
	Raw[period]= (min+max)/2;
	elseif Price == "typical" then
	Raw[period]= (min+max+source.close[period])/3;
	elseif Price == "weighted" then
	Raw[period]= (min+max+source.close[period]*2)/4;
	elseif Price == "open" then
	Raw[period]= source.open[period-Period+1];
	elseif Price == "close" then
	Raw[period]= source.close[period];
	elseif Price == "high" then
	Raw[period]= max;
	elseif Price == "low" then
	Raw[period]= min;
	end

    MA:update(mode);
	
	
    if period < first   then
	return;
	end
    

    
    ma[period] = MA.DATA[period];
    
end