Drain

local x = 0
local y = 0

local xPos = 0
local yPos = 0

local last = false
local done = false
local levelDone = false

local function goDwn()
  local floor = false
  for i=0, 6 do
    if not turtle.down() then
      floor = true
    end
  end
  return floor
end


local function drain()
  turtle.select(1)
  turtle.placeUp()
  sleep(1)
  turtle.digUp()
end

local function nextLine()
  drain()

  local startPos = yPos
  turtle.turnRight()
  for i=0, 6 do
    if yPos < y then
      if turtle.forward() then
        yPos = yPos+1
      end
    end
  end
  turtle.turnLeft()
  if startPos == yPos then
    if goDwn() then
      last = true
    end
    turtle.turnLeft()
    for i=0, y-1 do
      turtle.forward()
    end
    yPos = 0
    turtle.turnRight()
    if xPos == x-1 then
      for i=0, x do
        turtle.back()
      end
      xPos = 0
    end
    if last == true then
      done = true
    end
    levelFinished = true
  end
end

local function startDraining()
  print("enter x: ")
  x = tonumber(read())
  print("enter y: ")
  y = tonumber(read())

  turtle.down()
  turtle.down()
  turtle.down()
  while not done do

    drain()

    levelFinished = false
    for i=0, x-1 do
      if turtle.forward() then
        xPos = xPos+1
      end

      if xPos % 6 == 0 then
        drain()
      end

      if xPos == x then
        nextLine()
      end
    end

    drain()
    if not levelFinished then
      for i=0, x-1 do
        if turtle.back() then
          xPos = xPos-1
        end

        if xPos % 6 == 0 then
          drain()
        end

        if xPos == 0 then
          drain()
          nextLine()
        end
      end
    end
  end
end

if turtle.getItemCount(1) == 0 then
  print("No sponge found in slot 1")
else
  print("Sponge found")
  startDraining()
end