-- Id: 24158
-- More information about this indicator can be found at:
-- http://fxcodebase.com/

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function Init()
    indicator:name("WeisWave oscillator with Real volume");
    indicator:description("WeisWave oscillator with Real volume");
    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:addInteger("dif", "dif", "", 1);
    indicator.parameters:addBoolean("Absolute", "Absolute", "", false);

    indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("UPclr", "UP Color", "UP Color", core.rgb(0, 255, 0));
    indicator.parameters:addColor("DNclr", "DN Color", "DN Color", core.rgb(255, 0, 0));
end

local first;
local source = nil;
local dif;
local Absolute;
local difPip;
local mov, trend, wave, vol;
local UP=nil;
local DN=nil;
local Ind;

local FirstStart;
local LastTime;

function Prepare()
    source = instance.source;
    dif=instance.parameters.dif;
    Absolute=instance.parameters.Absolute;
     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;
    first = source:first()+2;
    mov = instance:addInternalStream(first, 0);
    trend = instance:addInternalStream(first, 0);
    wave = instance:addInternalStream(first, 0);
    vol = instance:addInternalStream(first, 0);
    local name = profile:id() .. "(" .. source:name() .. ", " .. instance.parameters.dif .. ")";
    instance:name(name);
    UP = instance:addStream("UP", core.Bar, name .. ".UP", "UP", instance.parameters.UPclr, first);
    UP:setPrecision(math.max(2, instance.source:getPrecision()));
    DN = instance:addStream("DN", core.Bar, name .. ".DN", "DN", instance.parameters.DNclr, first);
    DN:setPrecision(math.max(2, instance.source:getPrecision()));
    difPip=dif*source:pipSize();
end

function AsyncOperationFinished(cookie, success, message)

end

function Update(period, mode)
   if period>first then
        Ind:update(mode);
        if not(Ind.DATA:hasData(period)) then
            if period==first+1 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.close[period]>source.close[period-1] then
     mov[period]=1;
    elseif source.close[period]<source.close[period-1] then
     mov[period]=-1;
    else
     mov[period]=0;
    end
    if mov[period]~=0 and mov[period]~=mov[period-1] then
     trend[period]=mov[period];
    else
     trend[period]=trend[period-1];
    end
    if trend[period]~=wave[period-1] and math.abs(source.close[period]-source.close[period-1])>=difPip then
     wave[period]=trend[period];
    else
     wave[period]=wave[period-1];
    end
    if wave[period]==wave[period-1] then
     vol[period]=vol[period-1]+Ind.DATA[period];
    else
     vol[period]=Ind.DATA[period];
    end
    if wave[period]==1 then
     UP[period]=vol[period];
     DN[period]=0;
    elseif wave[period]==-1 then
     if Absolute then
      DN[period]=vol[period];
     else
      DN[period]=-vol[period];
     end 
     UP[period]=0;
    end
   end 
end