args = {...}
gridX = (tonumber(args[1])*9)
gridY = (tonumber(args[1])*9)
posX = 1
posY = 1
facing = 0
cycles = 0


function rotate(direction)
	if direction == "R" then
		turtle.turnRight()
		facing=facing+1
	elseif direction == "L" then
		turtle.turnLeft()
		facing = facing-1
	elseif direction == "180" then
		facing = facing+2
	end
	if facing>3 then
		facing=facing-4
	elseif facing<0 then
		facing=facing+4
	end
end

function move(blocks)
	for j = 1,blocks do
		turtle.forward()
		if facing == 0 then
			posY=posY+1
		elseif facing == 1 then
			posX=posX+1
		elseif facing == 2 then
			posY=posY-1
		elseif facing == 3 then
			posX=posX+1
		end
		if math.fmod(posY,5)==3 and (facing==0 or facing==2) then
			turtle.placeDown()
		elseif (posY==gridY or posY==1) and (facing==0 or facing==2) then
			turtle.placeDown()
		end
		if ((posY==gridY or posY==1) and (facing==0 or facing==2)) or ((posX==gridX or posx==1) and (facing==1 or facing==3)) then print("break")
			break end
	end
end

function nextColumn()
	if facing==0 then
		rotate("R")
		move(5)
		rotate("R")
	elseif facing==2 then
		rotate("L")
		move(5)
		rotate("L")
	end
end

function main()
	turtle.select(1)
	rotate("R")
	move(2)
	rotate("L")
	for i = 1,math.floor(gridX/5) do
		move(gridY)
		nextColumn()
	end
	move(gridY)
	if gridX>(posX+2) then
		nextColumn()
		move(gridY)
	end
	if facing==0 then
		rotate("L")
		move(gridX-1)
		rotate("L")
		move(gridY-1)
		rotate("180")
	elseif facing==2 then
		rotate("R")
		move(gridX-1)
		rotate("R")
	end
end

local trigger = true;
while true do
	os.pullEvent("redstone")
	if rs.getInput("back") and trigger then
		cycles=cycles+1
		if cycles==2 then
			main()
			cycles=0
			trigger=false
		end
    elseif not rs.getInput("back") then
		trigger = true
	end
end