-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=71820

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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("Four Candle Indicator Indicator");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);
	
	indicator.parameters:addGroup("Calculation");	
    indicator.parameters:addBoolean("Signal", "Signal Mode", "", false); 
	
	indicator.parameters:addGroup("Line Style");	
	indicator.parameters:addInteger("Size", "Arrow Size", "", 20); 
   indicator.parameters:addColor("clrUP", "Up Arrow", "" ,  core.COLOR_UPCANDLE);
    indicator.parameters:addColor("clrDN",  "Down Arrow", "" , core.COLOR_DOWNCANDLE);	
	indicator.parameters:addColor("color", "Bar Color", "", core.rgb(0, 0, 255)); 

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 Signal;	
local first;
local source = nil; 
local Indicator;
local Bar;	
local up, down;
-- Routine
 function Prepare(nameOnly)   
  
	source = instance.source
	
	Signal=instance.parameters.Signal;
 
    local name = profile:id() .. "(" ..  instance.source:name()  .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end
	
 
	first=source:first()+4;  
	
	if Signal then
    Bar = instance:addStream("Bar", core.Bar, name, "Bar", instance.parameters.color, first );
    Bar:setPrecision(math.max(2, instance.source:getPrecision())); 
    Bar:addLevel(0);	
	else
    Bar = instance:addInternalStream(0, 0);	
	end
	
	
	up = instance:createTextOutput ("Up", "Up", "Wingdings", instance.parameters.Size, core.H_Center, core.V_Top, instance.parameters.clrUP, 0);
    down = instance:createTextOutput ("Dn", "Dn", "Wingdings", instance.parameters.Size, core.H_Center, core.V_Bottom, instance.parameters.clrDN, 0);
 
end


function Update(period, mode)

 

	 if period < first then
	 return;
	 end
	  
	  
    up:setNoData(period);
    down:setNoData(period);	
	
	
	if source.close[period-3]<source.open[period-3]
	and source.close[period-2]<source.open[period-2]
	and source.close[period-1]<source.open[period-1]
	and source.close[period]>source.open[period]	
	and source.close[period]>source.high[period-3]	
	then
	Bar[period]= 1;
    up:set(period, source.high[period], "\217", source.high[period]);	
	elseif source.close[period-3]>source.open[period-3]
	and source.close[period-2]>source.open[period-2]
	and source.close[period-1]>source.open[period-1]
	and source.close[period]<source.open[period]	
	and source.close[period]<source.low[period-3]	
    then	
    down:set(period, source.low[period], "\218", source.low[period]);	
	Bar[period]= -1;	
	end
	
	
	
end