-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=72369

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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("BS Trend Indicator");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);

  
 	indicator.parameters:addGroup("Calculation");	
    indicator.parameters:addInteger("Period", "Period", "", 5, 1, 2000); 
	
	 indicator.parameters:addGroup("Line Style");	
    indicator.parameters:addInteger("width", "Line width", "", 1, 1, 5); 
	
	 indicator.parameters:addColor("Up", "Up Bar Color", "", core.rgb(0, 255, 0)); 
	 indicator.parameters:addColor("Down", "Down Bar Color", "", core.rgb(255, 0, 0)); 
end

-- Indicator instance initialization routine
-- Processes indicator parameters and creates output streams
-- TODO: Refine the first period calculation for each of the output streams.
-- TODO: Calculate all constants, create instances all subsequent indicators and load all required libraries
-- Parameters block
 
	
local first;
local source = nil;
local Period; 
local Indicator;
	
-- Routine
 function Prepare(nameOnly)   
 
    
	Period=instance.parameters.Period;
	source = instance.source
 
    local name = profile:id() .. "(" ..  instance.source:name().. "," ..  Period  .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end
 
	first=source:first()+Period ; 
    ld_48= instance:addInternalStream(0, 0);
 
	
	
    Bar = instance:addStream("Bar", core.Bar, name, "Bar", instance.parameters.Up, first );
    Bar:setPrecision(math.max(2, instance.source:getPrecision())); 
    Bar:addLevel(0);	
 
end


function Update(period, mode)
 

	 if period <= first then
	 return;
	 end
	 
	  local ld_96, ld_104 = mathex.minmax(source, period-Period+1, period);
	  
      local ld_16 = (source.high[period] + source.low[period]) / 2.0;
      ld_48[period] = 0.66 * ((ld_16 - ld_96) / (ld_104 - ld_96) - 0.5) + 0.67 * ld_48[period-1];
      ld_48[period] = math.min(math.max(ld_48[period], -0.999), 0.999);
      Bar[period] = math.log((ld_48[period] + 1.0) / (1 - ld_48[period])) / 2.0 + Bar[period-1] / 2.0; 
     if Bar[period] > 0 then 
	 Bar:setColor(period,  instance.parameters.Up);	
	 else
	 Bar:setColor(period,  instance.parameters.Down);
	 end	 
end