#!/usr/bin/env python3
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import logging
import unittest
from ipaddress import IPv6Network

import config
import thread_cert

# Test description:
#   This test verifies that Discovery Proxy and Advertising Proxy of otbr-agent work well after the mDNS daemon
#   (mdns or avahi-daemon) restarts.
#
# Topology:
#    ----------------(eth)------------------
#           |                  |     |
#          BR1 (Leader) ----- BR2   HOST
#           |                  |
#           ED1                ED2
#

BR1 = 1
BR2 = 2
HOST = 3
ED1 = 4
ED2 = 5

LEASE = 200  # Seconds
KEY_LEASE = 200  # Seconds


class MdnsRestart(thread_cert.TestCase):
    USE_MESSAGE_FACTORY = False

    TOPOLOGY = {
        BR1: {
            'name': 'BR1',
            'allowlist': [BR2, ED1],
            'is_otbr': True,
            'version': '1.2',
        },
        BR2: {
            'name': 'BR2',
            'allowlist': [BR1, ED2],
            'is_otbr': True,
            'version': '1.2',
        },
        HOST: {
            'name': 'Host',
            'is_host': True,
        },
        ED1: {
            'name': 'ED1',
            'allowlist': [BR1],
            'version': '1.2',
            'mode': 'rn',
        },
        ED2: {
            'name': 'ED2',
            'allowlist': [BR2],
            'version': '1.2',
            'mode': 'rn',
        },
    }

    def test(self):
        br1 = self.nodes[BR1]
        br2 = self.nodes[BR2]
        host = self.nodes[HOST]
        ed1 = self.nodes[ED1]
        ed2 = self.nodes[ED2]

        host.start(start_radvd=False)
        self.simulator.go(5)

        br1.start()
        self.simulator.go(config.LEADER_STARTUP_DELAY)
        self.assertEqual('leader', br1.get_state())

        self.simulator.go(5)

        br2.start()
        self.simulator.go(config.BORDER_ROUTER_STARTUP_DELAY)
        self.assertEqual('router', br2.get_state())

        ed1.start()
        ed2.start()
        self.simulator.go(5)
        self.assertEqual('child', ed1.get_state())
        self.assertEqual('child', ed2.get_state())

        br1.srp_server_set_enabled(True)
        br1.srp_server_set_lease_range(LEASE, LEASE, KEY_LEASE, KEY_LEASE)
        br2.srp_server_set_enabled(True)
        br2.srp_server_set_lease_range(LEASE, LEASE, KEY_LEASE, KEY_LEASE)
        self.simulator.go(3)
        self.assertEqual(br1.srp_server_get_state(), 'running')
        self.assertEqual(br2.srp_server_get_state(), 'running')

        # ED1 and ED2 register a service by SRP respectively.

        ed1.srp_client_set_host_name('ed1-host')
        ed1.srp_client_set_host_address(ed1.get_ip6_address(config.ADDRESS_TYPE.OMR)[0])
        ed1.srp_client_add_service('ed1', '_ed1._tcp', 12345, txt_entries=['id=ed1'])
        ed1.srp_client_enable_auto_start_mode()

        ed2.srp_client_set_host_name('ed2-host')
        ed2.srp_client_set_host_address(ed2.get_ip6_address(config.ADDRESS_TYPE.OMR)[0])
        ed2.srp_client_add_service('ed2', '_ed2._tcp', 12345, txt_entries=['id=ed2'])
        ed2.srp_client_enable_auto_start_mode()

        self.simulator.go(10)

        self.assertEqual(len(host.browse_mdns_services('_meshcop._udp')), 2)
        self.assertEqual(len(host.browse_mdns_services('_ed1._tcp')), 1)
        self.assertEqual(len(host.browse_mdns_services('_ed2._tcp')), 1)

        # BR1's mdns restart
        br1.stop_mdns_service()
        br1.start_mdns_service()

        self.simulator.go(10)

        self.assertEqual(len(host.browse_mdns_services('_meshcop._udp')), 2)
        self.assertEqual(len(host.browse_mdns_services('_ed1._tcp')), 1)
        self.assertEqual(len(host.browse_mdns_services('_ed2._tcp')), 1)

        ed1.dns_set_config(br1.get_ip6_address(config.ADDRESS_TYPE.ML_EID))

        # Since there is only one match, server should include
        # service info in additional section of its response.
        browsed_services = ed1.dns_browse('_ed2._tcp.default.service.arpa')
        self.assertEqual(len(browsed_services), 1)
        self.assertEqual(browsed_services['ed2']['port'], 12345)
        self.assertEqual(browsed_services['ed2']['txt_data'], 'id=656432')

        ed2.dns_set_config(br1.get_ip6_address(config.ADDRESS_TYPE.ML_EID))
        browsed_services = ed2.dns_browse('_ed1._tcp.default.service.arpa')
        self.assertEqual(len(browsed_services), 1)
        self.assertEqual(browsed_services['ed1']['port'], 12345)
        self.assertEqual(browsed_services['ed1']['txt_data'], 'id=656431')


if __name__ == '__main__':
    unittest.main()