gistfile1.rb

def move(params = {})
  current_move = params[:current_move]
  next_move    = params[:next_move]

  return up                   if current_move >  @current_location
  return down                 if current_move <  @current_location
  return open_door(next_move) if current_move == @current_location
  idle
end

private

def idle
  @status = :idle
end

def up
  @status           =  :up
  @direction        =  :up
  @current_location += @speed
end

def down
  @status           =  :down
  @direction        =  :down
  @current_location -= @speed
end

def open_door(next_move)
  @status = :open
  if next_move > @current_location
    @direction = :up
  elsif next_move < @current_location
    @direction = :down
  end
end