-- Id: 17093
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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("Disparity Index");
    indicator:description("Disparity Index");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);
    indicator.parameters:addGroup("Calculation");
    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;

-- Streams block
local DI = nil;

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

    local name = profile:id() .. "(" .. source:name() .. ", " .. tostring(Period) .. ")";
    instance:name(name);
	
	MA = core.indicators:create("EMA", source  , Period);
	first = MA.DATA:first();

    if (not (nameOnly)) then
        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
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)*100;
    
end