-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=60363
-- Id: 11234

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function Init()
    indicator:name("Momentum cross oscillator");
    indicator:description("Momentum cross oscillator");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);

    indicator.parameters:addGroup("Calculation");
    indicator.parameters:addInteger("Fast_Period", "Fast period", "", 5);
    indicator.parameters:addInteger("Slow_Period", "Slow period", "", 14);
    indicator.parameters:addInteger("Smooth_Period", "Smooth period", "", 3);
    indicator.parameters:addString("Smooth_Method", "Smooth method", "", "EMA");
    indicator.parameters:addStringAlternative("Smooth_Method", "MVA", "", "MVA");
    indicator.parameters:addStringAlternative("Smooth_Method", "EMA", "", "EMA");
    indicator.parameters:addStringAlternative("Smooth_Method", "KAMA", "", "KAMA");
    indicator.parameters:addStringAlternative("Smooth_Method", "Wilder", "", "Wilder");
    indicator.parameters:addStringAlternative("Smooth_Method", "LWMA", "", "LWMA");
    indicator.parameters:addStringAlternative("Smooth_Method", "SineWMA", "", "SineWMA");
    indicator.parameters:addStringAlternative("Smooth_Method", "TriMA", "", "TriMA");
    indicator.parameters:addStringAlternative("Smooth_Method", "LSMA", "", "LSMA");
    indicator.parameters:addStringAlternative("Smooth_Method", "SMMA", "", "SMMA");
    indicator.parameters:addStringAlternative("Smooth_Method", "HMA", "", "HMA");
    indicator.parameters:addStringAlternative("Smooth_Method", "ZeroLagEMA", "", "ZeroLagEMA");
    indicator.parameters:addStringAlternative("Smooth_Method", "DEMA", "", "DEMA");
    indicator.parameters:addStringAlternative("Smooth_Method", "T3", "", "T3");
    indicator.parameters:addStringAlternative("Smooth_Method", "ITrend", "", "ITrend");
    indicator.parameters:addStringAlternative("Smooth_Method", "Median", "", "Median");
    indicator.parameters:addStringAlternative("Smooth_Method", "GeoMean", "", "GeoMean");
    indicator.parameters:addStringAlternative("Smooth_Method", "REMA", "", "REMA");
    indicator.parameters:addStringAlternative("Smooth_Method", "ILRS", "", "ILRS");
    indicator.parameters:addStringAlternative("Smooth_Method", "IE/2", "", "IE/2");
    indicator.parameters:addStringAlternative("Smooth_Method", "TriMAgen", "", "TriMAgen");
    indicator.parameters:addStringAlternative("Smooth_Method", "JSmooth", "", "JSmooth");

    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:addInteger("Transparency", "Transparency", "", 50,0,100);
end

local first;
local source = nil;
local Fast_Period;
local Slow_Period;
local Smooth_Period;
local Smooth_Method;
local Fast_Mom, Slow_Mom;
local Fast_Smooth_Mom, Slow_Smooth_Mom;
local UP=nil;
local DN=nil;

function Prepare(nameOnly)
    source = instance.source;
    Fast_Period=instance.parameters.Fast_Period;
    Slow_Period=instance.parameters.Slow_Period;
    Smooth_Period=instance.parameters.Smooth_Period;
    Smooth_Method=instance.parameters.Smooth_Method;
    
    local name = profile:id() .. "(" .. source:name() .. ", " .. instance.parameters.Fast_Period .. ", " .. instance.parameters.Slow_Period .. ", " .. instance.parameters.Smooth_Period .. ", " .. instance.parameters.Smooth_Method .. ")";
    instance:name(name);
    if nameOnly then
        return;
    end
	assert(core.indicators:findIndicator("MOMENTUM") ~= nil, "Please, download and install MOMENTUM.LUA indicator");
    assert(core.indicators:findIndicator("AVERAGES") ~= nil, "Please, download and install AVERAGES.LUA indicator"); 
	
    Fast_Mom = core.indicators:create("MOMENTUM", source, Fast_Period);
    Slow_Mom = core.indicators:create("MOMENTUM", source, Slow_Period);
    Fast_Smooth_Mom = core.indicators:create("AVERAGES", Fast_Mom.DATA, Smooth_Method, Smooth_Period, false);
    Slow_Smooth_Mom = core.indicators:create("AVERAGES", Slow_Mom.DATA, Smooth_Method, Smooth_Period, false);
	
	first = math.max(Fast_Smooth_Mom.DATA:first(),Slow_Smooth_Mom.DATA:first());
    UP = instance:addStream("UP", core.Line, name .. ".UP", "UP", instance.parameters.UPclr, first);
    UP:setPrecision(math.max(2, instance.source:getPrecision()));
    DN = instance:addStream("DN", core.Line, name .. ".DN", "DN", instance.parameters.UPclr, first);
    DN:setPrecision(math.max(2, instance.source:getPrecision()));
    instance:createChannelGroup("MomCross","MomCross" , UP, DN, instance.parameters.UPclr, 100-instance.parameters.Transparency);
end

function Update(period, mode)
   if period<first then
   return;
   end
   
    Fast_Mom:update(mode);
    Slow_Mom:update(mode);
    Fast_Smooth_Mom:update(mode);
    Slow_Smooth_Mom:update(mode);
    UP[period]=Fast_Smooth_Mom.DATA[period]-100;
    DN[period]=Slow_Smooth_Mom.DATA[period]-100;
    if UP[period]>DN[period] then
     UP:setColor(period, instance.parameters.UPclr);
     DN:setColor(period, instance.parameters.UPclr);
    else
     UP:setColor(period, instance.parameters.DNclr);
     DN:setColor(period, instance.parameters.DNclr);
    end
  
end