milk.tankturtle

local inputSide = "bottom"
local outputSide = "left"

local tank = peripheral.wrap("right")

while true do
  -- start only if redstone signal is applied
  if redstone.getInput(inputSide) then
    print("DRAINING COW")
  end
  while redstone.getInput(inputSide) do
    if turtle.place() then
      if not tank.unpack() then
        turtle.turnLeft()
        turtle.turnLeft()
        shell.run("redpulse "..outputSide)
        print()
        while tank.drop() < 1000 do
          print("TANK FULL")
          sleep(5)
        end
        tank.unpack()
        while not tank.drop() < 1000 do
          print("TANK FULL")
          sleep(5)
        end
        turtle.turnLeft()
        turtle.turnLeft()
      end
      sleep(0.5)
    else
      print("WAITING FOR COW")
      sleep(10)
    end
  end
  print("STOPPED DRAINING COW")
  os.pullEvent("redstone")
end