-- More information about this indicator can be found at:
--http://fxcodebase.com/code/viewtopic.php?f=17&t=63816

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

	indicator.parameters:addGroup("Calculation");
	indicator.parameters:addString("Account", "Account to trade", "", "");
    indicator.parameters:setFlag("Account", core.FLAG_ACCOUNT);

	
	indicator.parameters:addGroup("Placement");
	indicator.parameters:addString("Y", " Y Placement","" , "Top");
    indicator.parameters:addStringAlternative("Y", "Top", "Top" , "Top");
    indicator.parameters:addStringAlternative("Y", "Bottom", "Bottom" , "Bottom"); 
	
	indicator.parameters:addString("X", " X Placement","" , "Right");
    indicator.parameters:addStringAlternative("X", "Right", "Right" , "Right");
    indicator.parameters:addStringAlternative("X", "Left", "Left" , "Left"); 
    indicator.parameters:addInteger("ShiftY", "Shift","" , 0);
 
	
	indicator.parameters:addGroup("Style");
   indicator.parameters:addColor("Label", "Label Color", "", core.rgb(0, 0, 0)); 
   indicator.parameters:addInteger("Size", "Font Size", "", 10);
    indicator.parameters:addColor("color", "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 Account;
local first;
local source = nil;
local X,Y;
local font;
local Label;
local Size;
local ShiftY;
-- Routine
function Prepare(nameOnly)
    Y=instance.parameters.Y;
	X=instance.parameters.X;  
	ShiftY=instance.parameters.ShiftY;
    Label=instance.parameters.Label;
	Size=instance.parameters.Size;   
	Account=instance.parameters.Account;
    source = instance.source;
    first=source:first();
	
    local name = profile:id() .. "(" .. source:name() .. ")";
    instance:name(name);
	
	
	if   (nameOnly) then
        return;
    end
   	
    instance:ownerDrawn(true);

	
end

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

  
end
 
local init = false;
 
function Draw(stage, context)
 
	
	if stage~=0 then
	return;
	end
	
        if not init then
           context:createFont (1, "Arial", context:pointsToPixels (Size), context:pointsToPixels (Size), 0);
            init = true;
        end
	
			
	local Text1= "UsableMargin/Equity :" ..string.format("%." .. 2 .. "f", getUsableMarginPercent()) ..  "%";  
	 
   local i=3;	 
   width, height = context:measureText (1, Text1, 0);
   context:drawText (1,  Text1, Label, -1,  iX(context,width,0,1) ,  iY(context,height,i,0) ,iX(context,width,0,2),iY(context,height,i,1), 0 );	
   

end		
 
 

function iX(context, width,Shift,x)

	if X== "Left" then
	return  context:left()+ Shift*width +  width*(x-1) ;
	else
	return context:right() - width*Shift -  width*(1-(x-1));
	end
end



function iY(context, height,Index , Line)

	if Y== "Top" then
		return context:top()+Index*height +ShiftY*height + Line *height;
	else
		if Line== 1 then
		return context:bottom()-(Index+1)*height -ShiftY*height + height;
		else
		return context:bottom()-(Index+1)*height -ShiftY*height;
		end
	end
end
 
 function checkAccountRow()
    if mAccountRow == nil then
        mAccountRow = core.host:findTable("accounts"):find("AccountID", Account);
    else
        mAccountRow:refresh();
    end
end

function getUsableMargin()
    checkAccountRow();
    return mAccountRow.UsableMargin;
end

function getUsableMarginPercent()
   checkAccountRow();
   return (mAccountRow.UsableMargin / mAccountRow.Equity) * 100;
end