-- Id: 10058
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=59573

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function Init()
    indicator:name("WeisWave oscillator");
    indicator:description("WeisWave oscillator");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);

    indicator.parameters:addGroup("Calculation");
    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));
	
	indicator.parameters:addGroup("Divisor Calculation");
	indicator.parameters:addInteger("Divisor", "Divisor", "", 1);
	indicator.parameters:addIntegerAlternative("Divisor", "1", "", 1);
    indicator.parameters:addIntegerAlternative("Divisor", "100", "", 100);
    indicator.parameters:addIntegerAlternative("Divisor", "1000", "", 1000);
    indicator.parameters:addIntegerAlternative("Divisor","10000", "", 10000)
	indicator.parameters:addIntegerAlternative("Divisor","100000", "", 100000)
	indicator.parameters:addIntegerAlternative("Divisor","1000000", "", 1000000)
end

local first;
local source = nil;
local dif;
local Absolute;
local difPip;
local mov, trend, wave, vol;
local UP=nil;
local DN=nil;
local Divisor;
function Prepare(nameOnly)
    source = instance.source;
    dif=instance.parameters.dif;
    Absolute=instance.parameters.Absolute;
	Divisor=instance.parameters.Divisor;
    first = source:first()+2;
    local name = profile:id() .. "(" .. source:name() .. ", " .. instance.parameters.dif .. ")";
    instance:name(name);
    if nameOnly then
        return;
    end
    mov = instance:addInternalStream(first, 0);
    trend = instance:addInternalStream(first, 0);
    wave = instance:addInternalStream(first, 0);
    vol = instance:addInternalStream(first, 0);
    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 Update(period, mode)
   if period>first then
    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]+source.volume[period]/Divisor;
    else
     vol[period]=source.volume[period]/Divisor;
    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