xPos,zPos=0,0
xDir,zDir=0,1
movement=0
xUnload=0
xReFuel=0

function xPosition()
	if	xDir == 0 then
		xPos = xPos + 1
	else
		xPos = xPos - 1
	end
end

function zPosition()
	if	zDir == 1 then
		zPos = zPos + 1
	else
		zPos = zPos - 1
	end
end

function xForward()
	move()
	xPosition()
end

function zForward()
	move()
	zPosition()
end

function move()
	fuelUp()
	if	not turtle.detect() then
		turtle.digUp()
		turtle.forward()
	else
	turtle.dig()
	turtle.digUp()
	turtle.attack()
	turtle.forward()
	end
end

function unload()
	for i=2,16 do
		turtle.select(i)
		turtle.drop()
	end

	xUnload = xUnload + 1
	print("unloaded " .. xUnload .. " times")
	turtle.rotateRight()
	turtle.rotateRight()

		if xDir == 1 then
		xDir = 0
		end
end

function fuelUp()
	if turtle.getFuelLevel() < 100 then
	turtle.select(1)
	turtle.refuel(1)
	xReFuel = xReFuel + 1
	print("refueled " .. xReFuel .. " times")
	end
end
-----------------------------------------------
turtle.select(1)
turtle.refuel(2)
while true do
	turtle.turtleUp()
	for i=1,5 do
		xForward()
	end

	------------------------------
	function rotateRight()
		turtle.turnRight()
		if zDir == 1 then
		zDir = 0
		end
	end
	------------
	rotateRight()
	--------------
	for i=1,movement do
		zForward()
	end

	movement = movement + 1

	function rotateLeft()
		turtle.turnLeft()
		if xDir == 1 then
		xDir = 0
		end
	end

	rotateLeft()

	for i=1,20 do
		turtle.digDown()
		xForward()
	end

	function uTurn()
		print("turning arround")
		turtle.turnRight()
		zForward()
		turtle.turnRight()
		if xDir == 1 then
		xDir = 0
	    else
	    xDir = 1
		end
		print("successfully turned")

	end

	for i=1,20 do
		turtle.digDown()
		xForward()
	end

	rotateRight()

	for i=1,movement do
		zForward()
	end

	rotateLeft()

	for i=1,10 do
		xForward()
	end

	turtle.turtleDown()
	unload()

end