-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=25133
-- Id: 7789

--+------------------------------------------------------------------+
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--+------------------------------------------------------------------+
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--+------------------------------------------------------------------+
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--+------------------------------------------------------------------+
function Init()
    indicator:name("Price Difference Indicator");
    indicator:description("Price Difference Indicator");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);
    indicator.parameters:addGroup("Calculation");	
	
	indicator.parameters:addString("Price", "Price Source", "", "median");
    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:addDouble("Difference", "Difference (in Pips)", "If set to Zero Signal is deactivated", 0);
	
	
	--indicator.parameters:addBoolean("On", "Repaint", "", true);
	
	indicator.parameters:addGroup("Style");	
    indicator.parameters:addColor("Up", "Color of Up", "Color of Up", core.rgb(0, 255, 0));
	indicator.parameters:addColor("Down", "Color of Down", "Color of Down", core.rgb(255, 0, 0));
	indicator.parameters:addInteger("Size", "Font Size", "", 10, 1 , 100);	
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 Difference;
--local On;
local first;
local source = nil;
local Price;
-- Streams block
local Up = nil;
local Down = nil;
local Size;
-- Routine
function Prepare(nameOnly)
    Difference = instance.parameters.Difference;
	--On = instance.parameters.On;
	Size = instance.parameters.Size;
	Price = instance.parameters.Price;
    source = instance.source;
    first = source:first();

    local name = profile:id() .. "(" .. source:name() .. ", " .. tostring(Difference) .. ", " .. tostring(Price) .. ")";
    instance:name(name);

    if (not (nameOnly)) then
         Up = instance:createTextOutput ("Up", "Up", "Wingdings", Size, core.H_Center, core.V_Top, instance.parameters.Up, first);
         Down = instance:createTextOutput ("Dn", "Dn", "Wingdings", Size, core.H_Center, core.V_Bottom, instance.parameters.Down, first);
    end
end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period)
    if period < first or not  source:hasData(period) then
	return;
	end
	
	if Difference == 0   then
	Up:setNoData (period);
	Down:setNoData (period);
	return;
	end
	
	    if (( source[Price][period] - source[Price][period-1] ) /  source:pipSize()) >   Difference then
        Up:set(period, source.high[period], "\226");
		elseif (( source[Price][period] - source[Price][period-1] ) /  source:pipSize())  <    -Difference  then
		Down:set(period, source.low[period], "\225");
		end
    
end