-- Id: 14388
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=23048

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--+------------------------------------------------------------------------------------------------+
function Init()
    indicator:name("Disparity Index");
    indicator:description("Disparity Index");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);
    indicator.parameters:addGroup("Calculation");
	
	indicator.parameters:addString("Method", "Method", "", "MVA");
    indicator.parameters:addStringAlternative("Method", "MVA", "", "MVA");
    indicator.parameters:addStringAlternative("Method", "EMA", "", "EMA");
    indicator.parameters:addStringAlternative("Method", "Wilder", "", "Wilder");
    indicator.parameters:addStringAlternative("Method", "LWMA", "", "LWMA");
    indicator.parameters:addStringAlternative("Method", "SineWMA", "", "SineWMA");
    indicator.parameters:addStringAlternative("Method", "TriMA", "", "TriMA");
    indicator.parameters:addStringAlternative("Method", "LSMA", "", "LSMA");
    indicator.parameters:addStringAlternative("Method", "SMMA", "", "SMMA");
    indicator.parameters:addStringAlternative("Method", "HMA", "", "HMA");
    indicator.parameters:addStringAlternative("Method", "ZeroLagEMA", "", "ZeroLagEMA");
    indicator.parameters:addStringAlternative("Method", "DEMA", "", "DEMA");
    indicator.parameters:addStringAlternative("Method", "T3", "", "T3");
    indicator.parameters:addStringAlternative("Method", "ITrend", "", "ITrend");
    indicator.parameters:addStringAlternative("Method", "Median", "", "Median");
    indicator.parameters:addStringAlternative("Method", "GeoMean", "", "GeoMean");
    indicator.parameters:addStringAlternative("Method", "REMA", "", "REMA");
    indicator.parameters:addStringAlternative("Method", "ILRS", "", "ILRS");
    indicator.parameters:addStringAlternative("Method", "IE/2", "", "IE/2");
    indicator.parameters:addStringAlternative("Method", "TriMAgen", "", "TriMAgen");
    indicator.parameters:addStringAlternative("Method", "JSmooth", "", "JSmooth");
	indicator.parameters:addStringAlternative("Method", "KAMA", "", "KAMA");

    indicator.parameters:addInteger("Period", "Period", "Period", 13);

	indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("DI_color", "Color of DI", "Color of DI", 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 MA;
local first;
local source = nil;
local Method;
-- Streams block
local DI = nil;

-- Routine
function Prepare(nameOnly)
    Period = instance.parameters.Period;
	Method = instance.parameters.Method;
    source = instance.source;
    

    local name = profile:id() .. "(" .. source:name() .. ", " .. tostring(Method).. ", " .. tostring(Period) .. ")";
    instance:name(name);
	
	
    if  nameOnly  then	
	return;
	end
	
        assert(core.indicators:findIndicator("AVERAGES") ~= nil, "Please, download and install AVERAGES.LUA indicator");

        MA = core.indicators:create("AVERAGES", source  , Method, Period);
        first = MA.DATA:first();
        DI = instance:addStream("DI", core.Line, name, "DI", instance.parameters.DI_color, first);
		DI:setWidth(instance.parameters.width);
        DI:setStyle(instance.parameters.style);
		
		DI:setPrecision(math.max(2, instance.source:getPrecision()));
	
 
end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period, mode)
    
	
	MA:update(mode)
	
	
	if period <= first or not  source:hasData(period) then
	return;
	end
	
    DI[period] = ((source[period] - MA.DATA[period]) / MA.DATA[period] *100);
    
end