def calculate_action(client, ant)
  if ant.has_food and (ant.cell.home == client.id) # Drop food if we are at home
    DROP_FOOD
  elsif (ant.cell.food > 0) and !ant.has_food and (ant.cell.home != client.id) # Take food if there is food an we are not at home
    TAKE_FOOD
  else # Make a random move
    case rand(4)
    when 0..1 then GO
    when 2 then TURN_LEFT
    when 3 then TURN_RIGHT
    end
  end
end