-- Id: 6362
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=16163

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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_Price_Overlay");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);

	
	indicator.parameters:addGroup("Calculation");
	
	indicator.parameters:addString("Price" , "Data Source", "", "close");
    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:addStringAlternative("Price", "Median", "", "median");
    indicator.parameters:addStringAlternative("Price" , "Typical", "", "typical");
	indicator.parameters:addStringAlternative("Price" , "Weighted ", "", "weighted");		

	indicator.parameters:addString("Method" , "Method for avegage", "", "EMA");
    indicator.parameters:addStringAlternative("Method" , "MVA", "", "MVA");
    indicator.parameters:addStringAlternative("Method", "EMA", "", "EMA");
	 indicator.parameters:addStringAlternative("Method", "KAMA", "", "KAMA");
    indicator.parameters:addStringAlternative("Method" , "LWMA", "", "LWMA");	
	indicator.parameters:addStringAlternative("Method" , "SMMA", "", "SMMA");
	indicator.parameters:addStringAlternative("Method" , "TMA", "", "TMA");
	indicator.parameters:addStringAlternative("Method" , "WMA", "", "WMA");
	indicator.parameters:addStringAlternative("Method" , "VIDYA", "", "VIDYA");
	
	  indicator.parameters:addInteger("Period", "Period", "Period", 14,2,2000);
	

	
	indicator.parameters:addString("Type" , "Overlay Type", "", "Slope");
    indicator.parameters:addStringAlternative("Type" , "Slope", "", "Slope");
    indicator.parameters:addStringAlternative("Type", "Cross", "", "Cross");


	
	indicator.parameters:addGroup("Style");
	indicator.parameters:addColor("Up", "Up color", "", core.rgb(0, 255, 0));
	indicator.parameters:addColor("Dn", "Down color", "", core.rgb(255, 0, 0));
	indicator.parameters:addColor("No", "Neutral color", "", 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 first;
local source = nil;

local Price;

local  open=nil;
local  close=nil;
local  high=nil;
local  low=nil;
local MA;
local Method;
local Period;
 function Prepare(nameOnly) 
    Type = instance.parameters.Type;
	Price = instance.parameters.Price;	
	Method= instance.parameters.Method;
	Period= instance.parameters.Period;	
	source = instance.source;	
	
	
	     
    local name = profile:id() .. "(" .. source:name() ..", ".. Method ..", ".. Price ..", ".. Period..", ".. Type .. ")";
    instance:name(name);
	
	if   (nameOnly) then
        return;
    end
	
    assert(core.indicators:findIndicator(Method) ~= nil, Method .. " indicator must be installed");
	MA=core.indicators:create(Method,  source[Price], Period);
	first= MA.DATA:first();

    	
	open = instance:addStream("openup", core.Line, name, "", core.rgb(0, 0, 0), first);
    high = instance:addStream("highup", core.Line, name, "", core.rgb(0, 0, 0), first);
    low = instance:addStream("lowup", core.Line, name, "", core.rgb(0, 0, 0), first);
    close = instance:addStream("closeup", core.Line, name, "", core.rgb(0, 0, 0), first);
    instance:createCandleGroup("OVERLAY", "OVERLAY", open, high, low, close);
		
end

-- Indicator calculation routine
function Update(period, mode)
	
    open[period] = source.open[period];
	close[period] = source.close[period];
	high[period] = source.high[period];
	low[period] = source.low[period];
	
			if period < first then
			open:setColor(period, instance.parameters.No);	
			return;
			end
	


		 MA:update(mode);
			 
		 
	if Type == "Slope" then
	
		if MA.DATA[period]> MA.DATA[period-1] then		
		open:setColor(period, instance.parameters.Up);
        elseif  MA.DATA[period]< MA.DATA[period-1]  then
		open:setColor(period, instance.parameters.Dn);
		else
		open:setColor(period, instance.parameters.No);			
		end
		
	elseif Type == "Cross" then

        if  source[Price][period] > MA.DATA[period] then		
		open:setColor(period, instance.parameters.Up);
        elseif source[Price][period] < MA.DATA[period]  then
		open:setColor(period, instance.parameters.Dn);
		else
		open:setColor(period, instance.parameters.No);			
		end	
		
	end	
				

		
 end