mining_tunnnel

print("distance = ")
distance=read() - 1

print("width = ")
width=read()


function forward_width()
	for i = 1,width do
		turtle.dig()
		turtle.forward()
		turtle.digDown()
		turtle.digUp()
		turtle.up()
		turtle.digUp()
		turtle.up()
		turtle.digUp()
		turtle.down()
		turtle.down()

	end
end

function import_storage()
	for i = 2,16 do
  	turtle.select(i)
  	turtle.dropDown()
	end
end

fuel=distance * 5 + 20

if turtle.getFuelLevel() <= fuel then
  print("")
  print("Fuel level is low.")
  print("Set fuel in slot 1.")
  turtle.select(1)
  while turtle.getFuelLevel() <= fuel do
    turtle.refuel()
    sleep(1)
  end
  print("")
  print("Fuel is enough!")
end
for i=1,16 do
  turtle.select(i)
  turtle.dropDown()
end
turtle.select(1)
print("Mining start.")
for i = 0,distance do
  turtle.dig()
  turtle.forward()
  turtle.digDown()
  turtle.digUp()
	turtle.up()
	turtle.digUp()
	turtle.up()
	turtle.digUp()
	turtle.down()
	turtle.down()
  turtle.turnLeft()

	forward_width()

  turtle.turnRight()
  turtle.turnRight()

	for i = 1,width do
	  turtle.forward()
	end

  forward_width()

  turtle.turnLeft()
  turtle.turnLeft()

	for i = 1,width do
 		turtle.forward()
	end

  turtle.turnRight()

	if i % 5 == 5 then
		turtle.select(1)
		turtle.placeDown()
	end

  remain = distance - i
  print("Remaining: ",remain," m")

  if turtle.getSelectedSlot() == 16 then
    turtle.turnRight()
    turtle.turnRight()

    for i=0,distance do
      turtle.forward()
    end

		import_storage()

    turtle.turnLeft()
    turtle.turnLeft()

    for i=0,distance do
      turtle.forward()
    end

  end
end

turtle.turnRight()
turtle.turnRight()

for i=0,distance do
  turtle.forward()
end

import_storage()

turtle.turnLeft()
turtle.turnLeft()

print("Mining has ended!")