# Copyright (C) 2015 Nippon Telegraph and Telephone Corporation.
#
# Licensed 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.

import unittest
from fabric.api import local
from lib import base
from lib.gobgp import *
from lib.exabgp import *
import sys
import os
import time
import nose
from noseplugin import OptionParser, parser_option
from itertools import chain


def community_exists(path, com):
    a, b = com.split(':')
    com = (int(a) << 16) + int(b)
    for a in path['attrs']:
        if a['type'] == BGP_ATTR_TYPE_COMMUNITIES and com in a['communities']:
            return True
    return False


class GoBGPTestBase(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        gobgp_ctn_image_name = parser_option.gobgp_image
        base.TEST_PREFIX = parser_option.test_prefix

        g1 = GoBGPContainer(name='g1', asn=65000, router_id='192.168.0.1',
                            ctn_image_name=gobgp_ctn_image_name,
                            log_level=parser_option.gobgp_log_level)
        q1 = ExaBGPContainer(name='q1', asn=65001, router_id='192.168.0.2')
        q2 = ExaBGPContainer(name='q2', asn=65002, router_id='192.168.0.3')
        q3 = ExaBGPContainer(name='q3', asn=65003, router_id='192.168.0.4')

        qs = [q1, q2, q3]
        ctns = [g1, q1, q2, q3]

        # advertise a route from q1, q2, q3
        for idx, q in enumerate(qs):
            route = '10.0.{0}.0/24'.format(idx+1)
            q.add_route(route)

        initial_wait_time = max(ctn.run() for ctn in ctns)

        time.sleep(initial_wait_time)

        br01 = Bridge(name='br01', subnet='192.168.10.0/24')
        [br01.addif(ctn) for ctn in ctns]

        g1.local('gobgp global policy export add default reject')

        for q in qs:
            g1.add_peer(q)
            q.add_peer(g1)

        cls.gobgp = g1
        cls.quaggas = {'q1': q1, 'q2': q2, 'q3': q3}
        cls.bridges = {'br01': br01}

    # test each neighbor state is turned establish
    def test_01_neighbor_established(self):
        for q in self.quaggas.itervalues():
            self.gobgp.wait_for(expected_state=BGP_FSM_ESTABLISHED, peer=q)

    def test_02_check_adj_rib_out(self):
        for q in self.quaggas.itervalues():
            self.assertTrue(len(self.gobgp.get_adj_rib_out(q)) == 0)

    def test_03_add_peer(self):
        q = ExaBGPContainer(name='q4', asn=65004, router_id='192.168.0.5')
        q.add_route('10.10.0.0/24')
        q.run()
        self.bridges['br01'].addif(q)
        self.gobgp.add_peer(q)
        q.add_peer(self.gobgp)
        self.gobgp.wait_for(expected_state=BGP_FSM_ESTABLISHED, peer=q)
        self.quaggas['q4'] = q
        for q in self.quaggas.itervalues():
            self.assertTrue(len(self.gobgp.get_adj_rib_out(q)) == 0)

    def test_04_disable_peer(self):
        q3 = self.quaggas['q3']
        self.gobgp.disable_peer(q3)
        self.gobgp.wait_for(expected_state=BGP_FSM_IDLE, peer=q3)

        for q in self.quaggas.itervalues():
            self.assertTrue(len(self.gobgp.get_adj_rib_out(q)) == 0)

    def test_05_enable_peer(self):
        q3 = self.quaggas['q3']
        self.gobgp.enable_peer(q3)
        self.gobgp.wait_for(expected_state=BGP_FSM_ESTABLISHED, peer=q3)

        for q in self.quaggas.itervalues():
            self.assertTrue(len(self.gobgp.get_adj_rib_out(q)) == 0)

    def test_06_change_global_policy(self):
        self.gobgp.local('gobgp policy neighbor add ns0 {0}'.format(self.gobgp.peers[self.quaggas['q1']]['neigh_addr'].split('/')[0]))
        self.gobgp.local('gobgp policy statement add st0')
        self.gobgp.local('gobgp policy statement st0 add condition neighbor ns0')
        self.gobgp.local('gobgp policy statement st0 add action community add 65100:10')
        self.gobgp.local('gobgp policy add p0 st0')
        self.gobgp.local('gobgp global policy export add p0 default accept')
        for q in self.quaggas.itervalues():
            self.gobgp.reset(q)

    def test_07_neighbor_established(self):
        for q in self.quaggas.itervalues():
            self.gobgp.wait_for(expected_state=BGP_FSM_ESTABLISHED, peer=q)

    def test_08_check_adj_rib_out(self):
        for q in self.quaggas.itervalues():
            paths = self.gobgp.get_adj_rib_out(q)
            self.assertTrue(len(paths) == 3)
            for path in paths:
                if q == self.quaggas['q1']:
                    self.assertTrue(community_exists(path, '65100:10'))
                else:
                    self.assertFalse(community_exists(path, '65100:10'))


if __name__ == '__main__':
    if os.geteuid() is not 0:
        print "you are not root."
        sys.exit(1)
    output = local("which docker 2>&1 > /dev/null ; echo $?", capture=True)
    if int(output) is not 0:
        print "docker not found"
        sys.exit(1)

    nose.main(argv=sys.argv, addplugins=[OptionParser()],
              defaultTest=sys.argv[0])