-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=71717

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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("Barebone Gradient Candles");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);

	
	indicator.parameters:addGroup("Calculation");
	indicator.parameters:addInteger("Period", "Period", "", 64, 2, 1000);
 
 
	
   
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  open=nil;
local  close=nil;
local  high=nil;
local  low=nil;

local Period;  
 function Prepare(nameOnly)   
 
    local name = profile:id() .. "(" ..  instance.source:name()  .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end


     
    Period = instance.parameters.Period;
 
	

	source = instance.source;  
	first= source:first();
    	
	open = instance:addStream("openup", core.Line, name, "", core.rgb(0, 0, 0), first);
    high = instance:addStream("highup", core.Line, name, "", core.rgb(0, 0, 0), first);
    low = instance:addStream("lowup", core.Line, name, "", core.rgb(0, 0, 0), first);
    close = instance:addStream("closeup", core.Line, name, "", core.rgb(0, 0, 0), first);
    instance:createCandleGroup("OVERLAY", "OVERLAY", open, high, low, close);
		
end

-- Indicator calculation routine
function Update(period)
	
    open[period] = source.open[period];
	close[period] = source.close[period];
	high[period] = source.high[period];
	low[period] = source.low[period];
	
	
	
	
			if period < source:size()-1 then 
			return;
			end
			
			
	local Shift
	
	for i= first, source:size()-1, 1 do
	Shift= math.floor(( source:size()-1 - i)%Period);	     
    open:setColor(i,  core.rgb(  (255/Period)*(Period-Shift) , 255-(255/Period)*(Period-Shift), 0));	
    end
 
end