-- Id: 14584

-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=62412

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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("Volume Accumulation with Real volume/Transactions");
    indicator:description("Volume Accumulation with Real volume/Transactions");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);

    indicator.parameters:addGroup("Calculation");
    indicator.parameters:addString("Ind", "Type of indicator", "", "Volume");
    indicator.parameters:addStringAlternative("Ind", "Volume", "", "Volume");
    indicator.parameters:addStringAlternative("Ind", "Transactions", "", "Transactions");

    indicator.parameters:addColor("VA_color", "Color of VA", "Color of VA", 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 first;
local source = nil;

-- Streams block
local VA = nil;
local Ind;

local FirstStart;
local LastTime;

-- Routine
function Prepare(nameOnly)
    source = instance.source;
    first = source:first();
	
	local name = profile:id() .. "(" .. source:name() .. ")";
    instance:name(name);
	
	if   (nameOnly) then
        return;
    end

     if instance.parameters.Ind=="Volume" then
      Ind=core.indicators:create("REAL VOLUME", source);
     else
      Ind=core.indicators:create("TRANSACTIONS", source);
     end
     FirstStart=true;
     LastTime=0;

    

    if (not (nameOnly)) then
        VA = instance:addStream("VA", core.Bar, name, "VA", instance.parameters.VA_color, first);
    VA:setPrecision(math.max(2, instance.source:getPrecision()));
    end
end

function AsyncOperationFinished(cookie, success, message)

end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period, mode)
    if period < first  then
	return;	
	end

        Ind:update(mode);
        if not(Ind.DATA:hasData(period)) then
            if period==first then
                FirstStart=true;
            end    
            return;
        elseif FirstStart then
            FirstStart=false;
            instance:updateFrom(first);    
        elseif LastTime~=source:date(period) and period==source:size()-1 then
            LastTime=source:date(period);
            instance:updateFrom(period-10);
        end
	
	    if (source.high[period]-source.low[period]) == 0 then
		VA[period]=0;
		else		
        VA[period] = Ind.DATA[period] * ((source.close[period]-source.low[period])-(source.high[period]-source.close[period]))/(source.high[period]-source.low[period]);
        end
end