-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=72565

--+------------------------------------------------------------------------------------------------+
--|                                                            Copyright © 2022, Gehtsoft USA LLC  | 
--|                                                                         http://fxcodebase.com  |
--+------------------------------------------------------------------------------------------------+
--|                                                              Support our efforts by donating   | 
--|                                                                 Paypal: https://goo.gl/9Rj74e  |
--+------------------------------------------------------------------------------------------------+
--|                                                                   Developed by : Mario Jemic   |                    
--|                                                                       mario.jemic@gmail.com    |
--|                                                        https://AppliedMachineLearning.systems  |
--|                                                             Patreon :  https://goo.gl/GdXWeN   |  
--+------------------------------------------------------------------------------------------------+

--Your donations will allow the service to continue onward.
--+------------------------------------------------------------------------------------------------+
--|BitCoin                    : 15VCJTLaz12Amr7adHSBtL9v8XomURo9RF                                 |  
--|Ethereum                   : 0x8C110cD61538fb6d7A2B47858F0c0AaBd663068D                         |  
--|SOL Address                : 4tJXw7JfwF3KUPSzrTm1CoVq6Xu4hYd1vLk3VF2mjMYh                       |
--|Cardano/ADA                : addr1v868jza77crzdc87khzpppecmhmrg224qyumud6utqf6f4s99fvqv         |  
--|Dogecoin Address           : DBGXP1Nc18ZusSRNsj49oMEYFQgAvgBVA8                                 |
--|SHIB Address               : 0x1817D9ebb000025609Bf5D61E269C64DC84DA735                         |              
--|Binance(ERC20 & BSC only)  : 0xe84751063de8ade7c5fbff5e73f6502f02af4e2c                         | 
--|BitCoin Cash               : 1BEtS465S3Su438Kc58h2sqvVvHK9Mijtg                                 | 
--|LiteCoin                   : LLU8PSY2vsq7B9kRELLZQcKf5nJQrdeqwD                                 |  
--+------------------------------------------------------------------------------------------------+


-- Indicator profile initialization routine

function Init()
    indicator:name("Forecast Oscillator");
    indicator:description("");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);
	
	indicator.parameters:addGroup("Calculation"); 
    indicator.parameters:addInteger("Period", "Period", "", 14, 1, 2000);
    indicator.parameters:addInteger("SignalPeriod", "Signal Period", "", 14, 1, 2000);
 
	indicator.parameters:addGroup("Style"); 	
    indicator.parameters:addColor("color1", "Line Color", "", core.rgb(0, 255, 0));
    indicator.parameters:addColor("color2", "Signal Line Color", "", core.rgb(255, 0, 0));
	indicator.parameters:addInteger("style", "Line Style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style", core.FLAG_LEVEL_STYLE);	
	indicator.parameters:addInteger("width", "Line Width", "", 3, 1, 5);
	
end

-- Indicator instance initialization routine
-- Processes indicator parameters and creates output streams
-- Parameters block

local Period,SignalPeriod; 
local first;
local source = nil;
 
local Oscillator;   

-- Routine
 function Prepare(nameOnly)   
   Period = instance.parameters.Period;
   SignalPeriod = instance.parameters.SignalPeriod;
	
	
	local Parameters= Period .. "," ..  SignalPeriod;
 
    local name = profile:id() .. "(" ..  instance.source:name()  .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end

    
			
    source = instance.source;
    first=source:first()+Period;
	
	 
	LinearRegression= instance:addInternalStream(0, 0);	
	TSF= instance:addInternalStream(0, 0);	

	Oscillator = instance:addStream("Oscillator" , core.Line, " Oscillator"," Oscillator",instance.parameters.color1, first+2);
	Oscillator:setWidth(instance.parameters.width);
    Oscillator:setStyle(instance.parameters.style);
    Oscillator:setPrecision(math.max(2, source:getPrecision()));
	
	Signal = instance:addStream("Signal" , core.Line, " Signal"," Signal",instance.parameters.color2, first+2+SignalPeriod);
	Signal:setWidth(instance.parameters.width);
    Signal:setStyle(instance.parameters.style);
    Signal:setPrecision(math.max(2, source:getPrecision()));	
end

-- Indicator calculation routine
function Update(period, mode)

 
 
	
    if period <= first then
	return;
	end
	
	LinearRegression[period]=mathex.lreg(source, period-Period+1, period);
	
	if period <= first+1 then
	return;
	end

	local lrs = (LinearRegression[period]-LinearRegression[period-1]);	
	TSF[period]=LinearRegression[period]+lrs;

	
	if period <= first+2 then
	return;
	end	
	
     Oscillator[period]=100*(source[period]-TSF[period-1])/source[period];
	 
	 
	if period <= first+2 +SignalPeriod then
	return;
	end	
	
	 Signal[period]=mathex.avg(Oscillator, period-SignalPeriod+1,period);
				  
end