-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=72385

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function Init()
    indicator:name("ROC Average");
    indicator:description("");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);

    indicator.parameters:addGroup("Calculation");
	
        indicator.parameters:addInteger("Period1" ,  "1.  ROC Periods", "", 10, 1, 300);
        indicator.parameters:addInteger("Period2" ,  "2.  ROC Periods", "", 15, 1, 300);
        indicator.parameters:addInteger("Period3" ,   "3.  ROC Periods", "", 20, 1, 300);
        indicator.parameters:addInteger("Period4",  "4.  ROC Periods", "", 30, 2, 300);		
         indicator.parameters:addInteger("Period5",  "Signal Periods", "", 9, 2, 300);		
		 
    indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("clrKST", "Oscillator Line Color", "", core.rgb(255, 0, 0));
    indicator.parameters:addInteger("widthKST", "Oscillator Line Width", "", 1, 1, 5);
    indicator.parameters:addInteger("styleKST", "Oscillator Line Style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("styleKST", core.FLAG_LINE_STYLE);
    indicator.parameters:addColor("clrSIG", "Signal Line Color", "", core.rgb(0, 255, 0));
    indicator.parameters:addInteger("widthSIG", "Signal Line Width", "", 1, 1, 5);
    indicator.parameters:addInteger("styleSIG", "Signal Line Style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("styleSIG", core.FLAG_LINE_STYLE);
 

end

 


local source;
local roc = {};
local mva; 

function Prepare(nameOnly)
    source = instance.source; 
    
    roc[1] = core.indicators:create("ROC", source,  instance.parameters.Period1);
    roc[2] = core.indicators:create("ROC", source,  instance.parameters.Period2);
    roc[3] = core.indicators:create("ROC", source,  instance.parameters.Period3);
    roc[4] = core.indicators:create("ROC", source,  instance.parameters.Period4);
	
	first=math.max(roc[1].DATA:first(),roc[2].DATA:first(),roc[3].DATA:first(),roc[4].DATA:first());
 
    local name = profile:id() .. ", " .. source:instrument();
    instance:name(name);
    if nameOnly then
        return;
    end
    kst = instance:addStream("KST", core.Line, name .. ".KST", "KST", instance.parameters.clrKST, first);
    kst:setPrecision(4);
    kst:addLevel(0, instance.parameters.styleLEV, instance.parameters.widthLEV, instance.parameters.clrLEV);
    kst:setWidth(instance.parameters.widthKST);
    kst:setStyle(instance.parameters.styleKST);

    mva  = core.indicators:create("MVA", kst,  instance.parameters.Period5); 
    signal = instance:addStream("SIG", core.Line, name .. ".SIG", "SIG", instance.parameters.clrSIG, mva.DATA:first());
    signal:setPrecision(math.max(2, instance.source:getPrecision()));
    signal:setWidth(instance.parameters.widthSIG);
    signal:setStyle(instance.parameters.styleSIG);
end

function Update(period, mode)
 
    for i = 1, 4, 1 do
        roc[i]:update(mode); 
    end
    if period <= first  then
	return;
	end
	
	
        kst[period] = (roc[1].DATA[period]  + roc[2].DATA[period]   +
                      roc[3].DATA[period]  + roc[4].DATA[period]) /4  ;
    
    
	mva:update(mode);
    if period <= mva.DATA:first() then
	return;
	end
        signal[period] = mva.DATA[period];
 
end