-- Available @ https://fxcodebase.com/code/viewtopic.php?f=17&t=73707

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--|                                                                         http://fxcodebase.com  |
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--|                                                                   Developed by : Mario Jemic   |                    
--|                                                                       mario.jemic@gmail.com    |
--|                                                        https://AppliedMachineLearning.systems  |
--|                                                                       https://mario-jemic.com/ |
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-- Indicator profile initialization routine

function Init()
    indicator:name("Zig Zag  Trend Finder");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);
	
	indicator.parameters:addGroup("Calculation"); 
	indicator.parameters:addBoolean("Reverse" , "Reverse", "",false);	 
    indicator.parameters:addInteger("P1", "Depth", "the minimal amount of bars where there will not be the second maximum", 12);
    indicator.parameters:addInteger("P2", "Deviation", "Distance in pips to eliminate the second maximum in the last Depth periods", 5);
    indicator.parameters:addInteger("P3", "Backstep", "The minimal amount of bars between maximums/minimums", 3);
	
	
		
	indicator.parameters:addGroup("Style"); 	
    indicator.parameters:addColor("color1", "Up Signal Color", "", core.rgb(0, 255, 0));
    indicator.parameters:addColor("color2", "Down Signal Color", "", core.rgb(255, 0, 0)); 
	
end

-- Indicator instance initialization routine
-- Processes indicator parameters and creates output streams
-- Parameters block
 
local first;
local source = nil;
local FirstLoad; 
local Reverse;
local ZigZag;
-- Routine
 function Prepare(nameOnly)   
 
    source = instance.source; 
	first=source:first() ; 	
	Reverse=instance.parameters.Reverse;

    
 
    local name = profile:id() .. "(" ..  instance.source:name().. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end
	ZigZag= core.indicators:create("ZIGZAG", source, instance.parameters.P1, instance.parameters.P2,instance.parameters.P3);
	

 
	Signal = instance:addStream("Signal" , core.Bar, " Signal"," Signal",instance.parameters.color1, first); 
    Signal:setPrecision(math.max(2, source:getPrecision()));
	FirstLoad=true;	
 
end

 
-- Indicator calculation routine
function Update(period, mode)
 
	if period < source:size()-1  
	then
	FirstLoad=true;	
	return;
	end
	
	
	if Last~=source:serial(period) then
	Last=source:serial(period);	
	
	ZigZag:update(core.UpdateAll);
	end
	
 
	
	if FirstLoad then
	FirstLoad=false;
	
	
			for i= first, source:size()-1, 1 do 
			 
					 Return= FindLast(i); 
					 
						  if Return~=nil  then	
								  if ZigZag.DATA:hasData(Return) then    					  
									  if ZigZag.DATA[Return] == source.high[Return] then
										  if Reverse then
										  Signal[i]=-1;
										  else
										  Signal[i]=1;
										  end	
									  Signal:setColor(i, instance.parameters.color1);	
									  elseif ZigZag.DATA[Return] == source.low[Return] then
										  if Reverse then
										  Signal[i]=1;
										  else
										  Signal[i]=-1;
										  end	
									  Signal:setColor(i, instance.parameters.color2);	
									  end
								  end
											  
						  end		
					  
					  
					 
					 	  
					
				 
			end
	
	else
	
 
	 			Return= FindLast(period); 
           
			 

		 
			 	 if Return~=nil  then	
				 for i= Return, source:size()-1, 1 do	 
				      

					 
					
								 if ZigZag.DATA:hasData(Return) then     					  
										  if ZigZag.DATA[Return] == source.high[Return] then
										  if Reverse then
										  Signal[i]=-1;
										  else
										  Signal[i]=1;
										  end								
										  Signal:setColor(i, instance.parameters.color1);	
										  elseif ZigZag.DATA[Return] == source.low[Return] then
										  if Reverse then
										  Signal[i]=1;
										  else
										  Signal[i]=-1;
										  end	
										  Signal:setColor(i, instance.parameters.color2);	
										  end
										  
								 end   
						  end
					  
					  
					 
					 
					  
				 end
	 end
		
    
	
	
				
	 
	 
				  
end
 
function FindLast(period)

        local Return=nil; 
		
 
				for period = period, 1, -1 do  
				
					if  ZigZag.DATA:hasData(period)  then

							if  source.high[period]== ZigZag.DATA[period] 
							or source.low[period]== ZigZag.DATA[period]
							then
							Return=period;	
							break;					
							end 

					end			
				 
				end
       


   return Return;

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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--+------------------------------------------------------------------------------------------------+