#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
#

try:
  from dispatch import *
except ImportError:
  from stubs import *

class RoutingTableEngine(object):
  """
  This module is responsible for converting the set of next hops to remote routers to a routing
  table in the "topological" address class.
  """
  def __init__(self, container):
    self.container = container
    self.id = self.container.id
    self.area = self.container.area
    self.next_hops = {}


  def tick(self, now):
    pass


  def next_hops_changed(self, next_hops):
    # Convert next_hops into routing table
    self.next_hops = next_hops
    new_table = []
    for _id, next_hop in next_hops.items():
      new_table.append(('_topo.%s.%s.#'  % (self.area, _id), next_hop))
      pair = ('_topo.%s.all' % (self.area), next_hop)
      if new_table.count(pair) == 0:
        new_table.append(pair)

    self.container.remote_routes_changed('topological', new_table)


  def get_next_hops(self):
    return self.next_hops

