print("Length: ")
  local length = io.read()
print("Width: ")
  local width = io.read()
print("Height: ")
  local height = io.read()





function turn(diretion, steps)
  if not direction then
    direction = "right"
  end

  if not steps then
   steps = 1
  end

  if direction == "left" then
    for i=1,steps do
      turtle.turnLeft()
    end
  elseif direction == "right" then
    for i=1,steps do
      turtle.turnRight()
    end
  else return false end

  return true
end





function move()
  if turtle.detect() then
    turtle.dig()
    return turtle.forward()
  else
    return turtle.forward()
  end
end




function newRow(rowCount, direction)

  if not (direction == "left" or direction == "right") then
    return false
  end

  local secondDir = function()
    if direction == "left" then
      return "right"
    end
    return "left"
  end

  if rowCount%2 ~= 0 then
    turn(direction)
    if not move() then return false end
    turn(direction)
  else
    turn(secondDir)
    if not move() then return false end
    turn(secondDir)
  end

  return true
end




function newCol()

  turtle.digDown()
  turtle.down()

  turn("right",2)
end




function mineAll(l,w,h)

  function leftOrRight(rowCount)
       if rowCount%2 == 0 then return "left" end
       return "right"
  end

  for hi = 1,h do
    print("Mining layer: ", hi, "/", h)
    for wi=1,w do
     print("Mining row: ", wi, "/", w)
     for li=1,l do
       if not move() then
         return false
       end
     end
     if not wi >= w then newRow(wi, leftOrRight(wi)) end
    end
    if not hi >= h then newCol() end
  end
  return true
end





function main()
  print("Total blocks to mine: ", length*width*height)
  mineAll(length, width, height)
end

main()