-- Available @  https://fxcodebase.com/code/viewtopic.php?f=17&t=73267
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--|                                                                       mario.jemic@gmail.com    |
--|                                                        https://AppliedMachineLearning.systems  |
--|                                                                       https://mario-jemic.com/ |
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-- Indicator profile initialization routine
-- Defines indicator profile properties and indicator parameters
-- TODO: Add minimal and maximal value of numeric parameters and default color of the streams
function Init()
	indicator:name("Stochastic signal strength normalized")
	indicator:description("")
	indicator:requiredSource(core.Bar)
	indicator:type(core.Oscillator)

	indicator.parameters:addGroup("Calculation")
	indicator.parameters:addInteger("iK", "Number of periods for %K", "", 25, 2, 1000)
	indicator.parameters:addInteger("iSD", "%D slowing periods", "", 25, 2, 1000)
	indicator.parameters:addInteger("iD", "The number of periods for %D.", "", 25, 2, 1000)
	indicator.parameters:addInteger("N", "Normalized Period", "", 5, 1, 1000)
	
	indicator.parameters:addString("Type", "Signal Type", "", "OpenClose")
	indicator.parameters:addStringAlternative("Type", "Open/Close", "", "OpenClose")
	indicator.parameters:addStringAlternative("Type", "Min/Max", "", "MinMax") 
	
	
	indicator.parameters:addString("KS", "Smoothing type for %K", "", "MVA")
	indicator.parameters:addStringAlternative("KS", "MVA", "", "MVA")
	indicator.parameters:addStringAlternative("KS", "EMA", "", "EMA")
	indicator.parameters:addStringAlternative("KS", "FS", "", "FS")

	indicator.parameters:addString("DS", "Smoothing type for %D", "", "MVA")
	indicator.parameters:addStringAlternative("DS", "MVA", "", "MVA")
	indicator.parameters:addStringAlternative("DS", "EMA", "", "EMA") 

	indicator.parameters:addGroup("Style")
	indicator.parameters:addColor("UpColor", "Cross Up Color", "", core.rgb(0, 255, 0))
	indicator.parameters:addColor("DownColor", "Cross Down Color", "", core.rgb(255, 0, 0)) 
	indicator.parameters:addColor("NeutralColor", "Min Max Color", "", core.rgb(0, 0, 255)) 
 
end

 
 
local first
local source = nil
local UpColor, DownColor
local DS, KS
local iK, iSD, iD 
local Stochastic = nil 
local N,Type;
function Prepare(nameOnly)
	  
	DS = instance.parameters.DS
	KS = instance.parameters.KS
	iK = instance.parameters.iK
	iSD = instance.parameters.iSD
	iD = instance.parameters.iD 
	N = instance.parameters.N;
	Type = instance.parameters.Type;
	UpColor = instance.parameters.UpColor
	DownColor = instance.parameters.DownColor

	source = instance.source

	local name =
		profile:id() ..
		"(" ..
			source:name() ..
				", " .. source:barSize() .. ", " .. iK .. ", " .. iSD .. ", " .. iD .. ", " .. KS .. ", " .. DS .. ")"
	instance:name(name)

	if (nameOnly) then
		return
	end

	Stochastic = core.indicators:create("STOCHASTIC", source, iK, iSD, iD, KS, DS)
	first = Stochastic.D:first() 

	
	Signal= instance:addInternalStream(0, 0);
	Cross= instance:addInternalStream(0, 0);
	Normalized = instance:addStream("Normalized", core.Bar, name, "Normalized", instance.parameters.UpColor, first );
    Normalized:setPrecision(math.max(2, instance.source:getPrecision())); 	
    Normalized:addLevel(0);	
end

 

-- Indicator calculation routine
function Update(period, mode)
    
	Stochastic:update(mode)
    if period <=first then
	return;
	end
	
	

		
	if Stochastic.K[period] > Stochastic.D[period] and Stochastic.K[period - 1] <= Stochastic.D[period - 1] then
		Cross[period] = 1 
	elseif Stochastic.K[period] < Stochastic.D[period] and Stochastic.K[period - 1] >= Stochastic.D[period - 1] then
		Cross[period] = -1 	
	else	
	     Cross[period] = 0  
	end
	
	
	if Cross[period] == 1 or Cross[period] == -1 then
		local last = Last(period)
			if last~=-1 and period - (period-last)*N > first  then 
			
			 if Type == "OpenClose" then 
			 Signal[period]=math.abs(source.close[period]-source.close[last]); 
             else
			 local min, max, minpos, maxpos = mathex.minmax(source, last, period)
			 Signal[period]=math.abs(max-min); 			 
             end
			 
			 local max=mathex.max(Signal, period - (period-last)*N, period);
			 Normalized[period]= Signal[period]/max;	

				 if Cross[period]==1 then
		            Normalized:setColor(period, instance.parameters.UpColor);						 
				 else
				 
		            Normalized:setColor(period, instance.parameters.DownColor);	
				end			 
			 end		
	end	
		
 
end

function Last(Start)
	local from=-1

	for period = Start - 1, first, -1 do
	
		
		if Cross[period] > 0 or Cross[period] <0 then
			from = period
			break 		   
		end
		
	end

	return from
end

 
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--|                                                                    We appreciate your support. | 
--+------------------------------------------------------------------------------------------------+
--|                                                               Paypal: https://goo.gl/9Rj74e    |
--|                                                             Patreon :  https://goo.gl/GdXWeN   |  
--+------------------------------------------------------------------------------------------------+
--|                                                                   Developed by : Mario Jemic   |                    
--|                                                                       mario.jemic@gmail.com    |
--|                                                        https://AppliedMachineLearning.systems  |
--|                                                                       https://mario-jemic.com/ |
--+------------------------------------------------------------------------------------------------+

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