function plant()
	-- move forward and plant the bone meal
	for i=1,4 do
		if turtle.detect() then
			turtle.dig()
		end
		turtle.forward()
	end

	turtle.place()
	turtle.turnRight()
	turtle.turnRight()

	-- move back to start position
	for i=1,4 do
		if turtle.detect() then
			turtle.dig()
		end
		turtle.forward()
	end

	-- move 4 blocks to the left to start position of "farm"-mode
	turtle.turnRight()
	for i=1,4 do
		if turtle.detect() then
			turtle.dig()
		end
		turtle.forward()
	end
	turtle.turnRight()

	-- reset turtle slot so flowers end up in the first 14 slots
	turtle.select(1)
end

function farm()
	local farmSize = 81
	local direction = false
	for x=1,farmSize do
		if turtle.detect() then
			turtle.dig()
		end
		turtle.forward()

		-- everytime the turtle has moved 9 blocks it turns around, left or right depending on the direction variabel
		if x % 9 == 0 then
			if direction then
				turtle.turnLeft()
				if turtle.detect() then
					turtle.dig()
				end
				turtle.forward()
				turtle.turnLeft()
			else
				turtle.turnRight()
				if turtle.detect() then
					turtle.dig()
				end
				turtle.forward()
				turtle.turnRight()
			end

			if direction then
				direction = false
			else
				direction = true
			end
		end
	end

	-- back to start position
	for i=1,9 do
		if turtle.detect() then
			turtle.dig()
		end
		turtle.forward()
	end
	turtle.turnRight()
	for i=1,5 do
		if turtle.detect() then
			turtle.dig()
		end
		turtle.forward()
	end

	-- dump the content into the chest
	turtle.turnLeft()
	for i=1,13 do
		turtle.select(i)
		turtle.drop()
	end

	turtle.turnRight()
	turtle.turnRight()

	direction = false
end

function checkFuel()
	-- checks if we still have fuel, if not turn it off
	if turtle.getFuelLevel() < 81 then
		error("insufficient fuel level")
	end
end

local boneMeal = 14
function checkBoneMealSupply()
	-- checks if we still have bone meal, if not turn it off
	if turtle.getItemCount(boneMeal) == 0 then
		boneMeal = boneMeal + 1
	end
	if boneMeal > 16 then
		error("out of bone meal")
	end
	turtle.select(boneMeal)
end

print("First, place the turtle and make a 9x9 square area infront of the turtle, with five blocks on the right side of it, and four on the left.")
print("Next, place a chest behind the turtle.")
print("Now place Bone Meal in the 14th, 15th and 16th slot of the turtle.")
print("Press Enter to start the program.")

while true do
	local sEvent, param = os.pullEvent("key")
	if sEvent == "key" then
	    if param == 28 then
	        print("Enter detected")
	        break
	    end
	end
end

turtle.select(boneMeal)
while true do
	checkFuel()
	checkBoneMealSupply()
	plant()
	farm()
end