-- différent ~= et pas !=

print("-> Demarre...")

-- Vérifie le fuel
function	verifuel()
	if turtle.getFuelLevel() <= 50 then
		turtle.select(1)
		if turtle.refuel(1) == false then
			print("-> Ne trouve pas de fuel")
			while turtle.refuel(1) == false do
				print("/!\ En attente de fuel dans le slot 1...")
				sleep(5)
			end
		end
		print("-> Recharge son fuel")
		return (1)
	end
	return (0)
end

-- Avance nb fois quoi qu'il arrive, sauf si bedrock
function	front(nb)
	while nb > 0 do
		while turtle.forward() == false do
			if verifuel() ~= 1 then
				if turtle.attack() == false then
					if turtle.dig() == false then
						print("Bedrock bloque le passage, arret.")
						return -1
					end
				end
			end
		end
		nb = nb - 1
	end
	return 0
end

function	down(nb)
	while nb > 0 do
		while turtle.down() == false do
			if verifuel() ~= 1 then
				if turtle.attackDown() == false then
					if turtle.digDown() == false then
						print("Bedrock bloque le passage, arret.")
						return -1
					end
				end
			end
		end
		nb = nb - 1
	end
	return 0
end

function	up(nb)
	while nb > 0 do
		while turtle.up() == false do
			if verifuel() ~= 1 then
				if turtle.attackUp() == false then
					if turtle.digUp() == false then
						print("Bedrock bloque le passage, arret.")
						return -1
					end
				end
			end
		end
		nb = nb - 1
	end
	return 0
end

function	checkinventory()
	w = 1
	j = isfull
	isfull = 0
	while w ~= 17 do
		if turtle.getItemCount(w) ~= 0 then
			isfull = isfull + 1
		end
		w = w + 1
	end
	if isfull == 16 then
		print("Inventaire plein.")
		return (-1)
	end
	return 0
end

function	digfour()
	nb = 0
	while nb ~= 4 do
		turtle.dig()
		turtle.turnRight()
		nb = nb + 1
	end
end

j = 0
deep = 0
while j == 0 do
	digfour()
	j = down(1)
	if j == 0 then
		j = checkinventory()
		if j == 0 then
			deep = deep + 1
		end
	end
end
while deep ~= 0 do
	up(1)
	deep = deep - 1
end