-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=63112

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function Init()
    indicator:name("Average Daily Range");
    indicator:description("Average Daily Range");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);	   
	
	indicator.parameters:addGroup("ADR Calculation");
	indicator.parameters:addString("TF", "Bar Size to display High/Low", "", "D1");
	indicator.parameters:setFlag("TF", core.FLAG_PERIODS);
    indicator.parameters:addInteger("N", "ADR Periods", "", 14);	
	indicator.parameters:addDouble("Multiplier", "Multiplier", "", 0.5);
	
 
	
	indicator.parameters:addBoolean("Show", "Show Projection", "", true);
	indicator.parameters:addBoolean("Label", "Show Label", "", true);
	indicator.parameters:addColor("color", "Line Color", "", core.rgb(0, 255, 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

local ArrowSize;
local source;
local ADR=nil;
local Source, loading;
local N;
local TF;
local Show;
local color;
local Label;
local host;
local first;
 
local size;
local width, style;
local ADR;
local Range;
local Multiplier;
function Prepare(nameOnly)   
    color=instance.parameters.color;
    Show=instance.parameters.Show; 
    ArrowSize=instance.parameters.ArrowSize;  
	Label=instance.parameters.Label;
    N=instance.parameters.N;	
	Multiplier=instance.parameters.Multiplier;
	TF=instance.parameters.TF;
	width=instance.parameters.width;
	style=instance.parameters.style;
    local name =  profile:id() .. ","  .. instance.source:name() ;
	instance:name(name);	
	
	if   (nameOnly) then
        return;
    end
	
    source = instance.source;
	first= source:first()+N;
    host = core.host;
   
	Source = core.host:execute("getSyncHistory", source:instrument(), TF, source:isBid(), N, 100, 101);
	loading=true;
	 
end


-- the function is called when the async operation is finished
function AsyncOperationFinished(cookie)
    if cookie == 100 then
        loading = false;
        instance:updateFrom(0);
    elseif cookie == 101 then
        loading = true;
    end
end
 

function Update(period, mode)

    if    period < source:size()-1 
	or loading
	or not period == source:size()-1 
	then
    return;
    end	
	
	start_date,end_date	= core.getcandle(TF, core.now(), core.host:execute("getTradingDayOffset"), core.host:execute("getTradingWeekOffset"));
 
	
	
	  local ADR=Calculate();
 
		
	   local  MAX = source.open[period] +  ADR*Multiplier;
	   local  MIN = source.open[period] -  ADR*Multiplier; 
	
		if Label then 					 
			core.host:execute ("drawLabel", 1, end_date , MAX  , "ADR : ".. win32.formatNumber( ADR/source:pipSize(), false,2) );  
        end
		
		
		if Show then
		 core.host:execute ("drawLine", 2,  start_date, MAX, end_date, MAX, color, style, width, string.format("%." .. 2 .. "f", MAX));
		 core.host:execute ("drawLine", 3,  start_date, MIN, end_date, MIN,  color, style, width, string.format("%." .. 2 .. "f",MIN));
	    end
 
		
end

function Calculate()

 local Sum=0;
 local p=Source:size()-1;
 
 for i= 1 , N , 1 do
 Sum = Sum+ (Source.high[p-i]-Source.low[p-i]) 
 end  
 return (Sum /N)
 end