farmer = peripheral.wrap("right")

function resetPos()
	local flag,data
	while true do
		while turtle.forward() do
		end

		flag,data = turtle.inspect()

		if flag and data.name == "minecraft:chest" then
			break
		end

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

while true do
	turtle.select(1)
	local flag,data = turtle.inspect()

	if farmer.getGrowthDown() == 100 then
		turtle.digDown()
		turtle.placeDown()
	end

	if flag then
		if data.name=="minecraft:stone" then
			turtle.turnRight()
			if not turtle.forward() then
				resetPos()
			end
			turtle.turnRight()
		elseif data.name=="minecraft:cobblestone" then
			turtle.turnLeft()
			if not turtle.forward() then
				resetPos()
			else
				turtle.turnLeft()
			end
		else
			resetPos()
		end
	else
		while not turtle.forward() do
		end
	end
end