-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=72532

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-- Indicator profile initialization routine

function Init()
    indicator:name("Median Stochastic");
    indicator:description("");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);
	
	indicator.parameters:addGroup("Calculation"); 
    indicator.parameters:addInteger("length", "Length", "", 20, 1, 2000);
 
 
	
	indicator.parameters:addGroup("Style"); 	
    indicator.parameters:addColor("color", "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);
	
	
    indicator.parameters:addGroup("Levels");	
    indicator.parameters:addDouble("Level1", "1. Level","", 0.40);
	indicator.parameters:addDouble("Level2", "2. Level","", 0.0);
	indicator.parameters:addDouble("Level3", "3. Level","", -0.40); 
	indicator.parameters:addColor("level_overboughtsold_color", "Line Color","", core.rgb(128, 128, 128));
    indicator.parameters:addInteger("level_overboughtsold_width","Line width","", 1, 1, 5);
    indicator.parameters:addInteger("level_overboughtsold_style", "Line Style","", core.LINE_SOLID);
    indicator.parameters:setFlag("level_overboughtsold_style", core.FLAG_LEVEL_STYLE);		
	
end

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

local length; 
local first;
local source = nil;
 
local Line;

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


    if   (nameOnly) then
        return;
    end

    
			
    source = instance.source;     
    first=source:first()+length;
	
	 
   
 
	Line = instance:addStream("Line" , core.Line, " Line"," Line",instance.parameters.color, first);
	Line:setWidth(instance.parameters.width);
    Line:setStyle(instance.parameters.style);
    Line:setPrecision(math.max(2, source:getPrecision()));
	
	Line:addLevel( instance.parameters.Level1, instance.parameters.level_overboughtsold_style, instance.parameters.level_overboughtsold_width, instance.parameters.level_overboughtsold_color);
	Line:addLevel( instance.parameters.Level2, instance.parameters.level_overboughtsold_style, instance.parameters.level_overboughtsold_width, instance.parameters.level_overboughtsold_color);
	Line:addLevel( instance.parameters.Level3, instance.parameters.level_overboughtsold_style, instance.parameters.level_overboughtsold_width, instance.parameters.level_overboughtsold_color);
	
end

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

 
	
	
    if period < first then
	return;
	end
    local min,max= mathex.minmax(source, period-length+1 ,period);	
    local median= mathex.median_s(source, period-length+1 ,period);
   
   
	 
	Line[period] = ( source[period]-median)/(max-min)
	 
end