function forward()
    if turtle.forward() then

	else
	    turtle.dig()
		forward()
	end
end

function statusScreen()
	shell.run("clear")
	print("--------------------------------------")
	print("      >> AreaTurtle # Status <<")
	print("--------------------------------------")
	print()
	print("Mode: ", turtleMode)
	print("Current Fuel: ", turtle.getFuelLevel())
end

function moveForward(weite)
	weite = weite - 1

	for i=0, weite, 1 do

		forward()

	end

end

function singleLayerMode()
	shell.run("clear")
	print("--------------------------------------")
	print("    >> AreaTurtle # Single-Layer <<")
	print("--------------------------------------")
	print("Wie Breit soll die Flaeche werden?")
	x = io.read()
	print("Wie Tief soll die Flaeche werden?")
	y = io.read()
	print("--------------------------------------")
	write("Turtle starten? j/n: ")
	ioread = io.read()
	if ioread == "n" then
		print("Programm beendet!")
	else

		statusScreen()

		for i=1, x, 1 do

			moveForward(y)

			if i == 1 then
				turtle.turnLeft()
				forward()
				turtle.turnLeft()
			end

			if i >= 2 then

				if i % 2 == 0 then
					turtle.turnRight()
					forward()
					turtle.turnRight()
				end

				if i % 2 >= 1 then
					turtle.turnLeft()
					forward()
					turtle.turnLeft()
				end

			end

		end

		statusScreen()

	end

end

function multiLayerMode()
	statusScreen()

	hell.run("clear")
	print("--------------------------------------")
	print("    >> AreaTurtle # Multi-Layer <<")
	print("--------------------------------------")
	print("Wie Breit soll der Raum werden?")
	x = io.read()
	print("Wie Tief soll der Raum werden?")
	y = io.read()
	print("Wie Hoch soll der Raum werden?")
	z = io.read()
	print("--------------------------------------")
	write("Turtle starten? j/n: ")
	ioread = io.read()

	if ioread == "n" then
		print("Programm beendet!")
	else

	end

end

function main()
	shell.run("clear")
	print(">> AreaTurtle # Digging X,(Y),Z Area <<")
	print("Choose:")
	print("  1. Single Layer")
	print("  2. Multi Layer")
	print()
	write("Option: ")
	option = io.read()

	if option == "1" then
		turtleMode="Single-Layer"
		singleLayerMode()
	end
	if option == "2" then
		turtleMode="Multi-Layer"
		multiLayerMode()
	end
end

turtleMode = "Single-Layer"

main()