#!/usr/bin/env python3
#
#  Copyright (c) 2018, The OpenThread Authors.
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import copy
import unittest

import command
import config
import mle
import thread_cert
from pktverify.consts import MLE_PARENT_REQUEST, MLE_LINK_REQUEST, MLE_LINK_ACCEPT, MLE_LINK_ACCEPT_AND_REQUEST, SOURCE_ADDRESS_TLV, CHALLENGE_TLV, RESPONSE_TLV, LINK_LAYER_FRAME_COUNTER_TLV, ROUTE64_TLV, ADDRESS16_TLV, LEADER_DATA_TLV, TLV_REQUEST_TLV, VERSION_TLV
from pktverify.packet_verifier import PacketVerifier
from pktverify.null_field import nullField

DUT_LEADER = 1
DUT_ROUTER1 = 2

# Test Purpose and Description:
# -----------------------------
# The purpose of this test case is to show that when the Leader is rebooted for a time period shorter than the leader timeout, it does not trigger network partitioning and remains the leader when it reattaches to the network.
#
# Test Topology:
# -------------
#   Leader
#     |
#   Router
#
# DUT Types:
# ----------
#  Leader
#  Router


class Cert_5_5_1_LeaderReboot(thread_cert.TestCase):
    #USE_MESSAGE_FACTORY = False

    TOPOLOGY = {
        DUT_LEADER: {
            'name': 'LEADER',
            'mode': 'rdn',
            'panid': 0xface,
            'allowlist': [DUT_ROUTER1]
        },
        DUT_ROUTER1: {
            'name': 'ROUTER',
            'mode': 'rdn',
            'panid': 0xface,
            'router_selection_jitter': 1,
            'allowlist': [DUT_LEADER]
        },
    }

    def _setUpLeader(self):
        self.nodes[DUT_LEADER].add_allowlist(self.nodes[DUT_ROUTER1].get_addr64())
        self.nodes[DUT_LEADER].enable_allowlist()

    def test(self):
        self.nodes[DUT_LEADER].start()
        self.simulator.go(5)
        self.assertEqual(self.nodes[DUT_LEADER].get_state(), 'leader')

        self.nodes[DUT_ROUTER1].start()
        self.simulator.go(5)
        self.assertEqual(self.nodes[DUT_ROUTER1].get_state(), 'router')

        leader_rloc = self.nodes[DUT_LEADER].get_ip6_address(config.ADDRESS_TYPE.RLOC)

        leader_rloc16 = self.nodes[DUT_LEADER].get_addr16()
        self.nodes[DUT_LEADER].reset()
        self.assertFalse(self.nodes[DUT_ROUTER1].ping(leader_rloc))
        self._setUpLeader()

        self.simulator.go(config.MAX_ADVERTISEMENT_INTERVAL)

        self.nodes[DUT_LEADER].start()

        self.simulator.go(5)
        self.assertEqual(self.nodes[DUT_LEADER].get_state(), 'leader')
        self.assertEqual(self.nodes[DUT_LEADER].get_addr16(), leader_rloc16)

        router1_link_local_address = self.nodes[DUT_ROUTER1].get_ip6_address(config.ADDRESS_TYPE.LINK_LOCAL)
        self.assertTrue(self.nodes[DUT_LEADER].ping(router1_link_local_address))

    def verify(self, pv):
        pkts = pv.pkts